Performance Nickel Alloys

Understanding Nickel Alloys

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Alloying Elements | Core Properties | Nickel Categories | Precision Strip & Wire

Why nickel alloys matter

Nickel alloys deliver a unique combination of high-temperature strength, oxidation/corrosion resistance, weldability, and formability, making them essential for applications in aerospace, defence, chemical processing, oil and gas, power generation, precision engineering and battery technologies. As temperatures climb or environmental chemistries get harsher, stainless steels can reach their limits; nickel alloys keep working, extending the operating window—from cryogenic service up to ~1000 °C+ (1832°F)

What are nickel alloys?

Nickel is a transition metal found in the Earth’s core as a nickel-iron alloy, and in the crust, where it is mainly in laterite ores (such as nickeliferous limonite and garnierite) and magmatic sulphide deposits (notably pentlandite). Identified in 1751 by Axel Fredrik Cronstedt, nickel has since become essential in alloy development, particularly in many stainless steels—stabilising austenite and improving corrosion resistance; while in duplex grades it helps phase balance alongside nitrogen and molybdenum.

Nickel’s unique atomic structure and properties make it an ideal foundation for alloy development. Nickel provides strength, ductility, and corrosion/oxidation resistance and readily forms solid solutions with many elements, enabling alloys tailored for extreme heat and aggressive chemistries. Depending on grade and design, service spans cryogenic to ~1000 °C+ (1832°F), with some grades exceeding 1,000 °C (1,832 °F). In practice, nickel-based alloys are commonly specified from ~870 °C (1,598 °F). Today, with their wide range of commercial applications, nickel alloys represent one of the most versatile and technologically advanced groups of engineering materials used in modern manufacturing.

Strategic Alloying Elements in Nickel Alloy and Their Effects

The development of nickel alloys represents sophisticated metallurgical engineering, with each alloying element serving specific purposes.

Chromium → oxidation & general corrosion resistance.

Chromium additions promote a stable chromium-oxide/passive film, improving oxidation and general corrosion resistance; specific contents vary by grade. In many Ni-Cr and Ni-Cr-Fe alloys, this is typically between 14–25%; however, actual ranges are alloy-specific and can fall outside of this range.

Molybdenum and tungsten → solid-solution strengthening + pitting/crevice resistance (chlorides).

Molybdenum and tungsten provide solid-solution strengthening and markedly improve resistance to pitting and crevice corrosion, especially in chloride-bearing media.

Iron → tuned for function (low Fe in high-Ni corrosion alloys; Fe-Ni for CTE/magnetics).

Iron is tuned to purpose: high-Ni, low-Fe alloys maximise corrosion resistance, while Fe-Ni compositions (e.g.NILO® 36) deliver controlled thermal expansion or soft-magnetic behaviour for precision uses.

Copper → reducing-acid resistance

Copper additions enhance performance in reducing acids (notably sulphuric); examples include INCOLOY® 825 and HASTELLOY® C-2000, where Cu improves resistance to reducing environments while Cr supports oxidising resistance.

Titanium & Aluminium → precipitation strengthening for high-temperature strength.

Titanium and aluminium enable precipitation hardening via γ′ (Ni₃(Al,Ti)), delivering exceptionally high-temperature strength retention in many nickel-base superalloys.

Nickel Alloy Core Properties and Performance Characteristics

Renowned for their exceptional performance characteristics, nickel alloys perform where conventional materials fall short. No matter how demanding the requirements, nickel alloys can provide a uniquely tailored combination of properties to exceed performance expectations.

Corrosion resistance:

Outstanding corrosion resistance is a key attribute of nickel alloys, significantly enhancing their durability in harsh environments, making them a popular choice for a broad range of applications. Their exceptional corrosion resistance stems from the formation of a stable oxide on their surface. This layer acts like a protective barrier against harsh chemical agents, including acidic solutions, seawater, and high-temperature gases.

Unlike stainless steels, which rely primarily on chromium for corrosion protection, nickel alloys exhibit superior stability and performance across a broader spectrum of conditions. While heat-resistant stainless steels can operate to ~800–950 °C (1472°F-1742°F) in specific roles, nickel alloys extend this range from cryogenic service to ~1000 °C+ (1832°F) and offer better oxidation/creep margins. Furthermore, these impressive alloys effectively maintain their structural integrity not just in oxidising environments, but also in reducing atmospheres that would typically challenge other materials. This dual capability makes nickel alloys particularly valuable in industries where exposure to extreme conditions is common, such as chemical processing, maritime applications, and power generation. Their versatility and reliability ensure that they remain a preferred choice for applications demanding long-lasting resistance to corrosion.

High-temperature performance:

Nickel alloys are characterised by their remarkable thermal stability, setting them apart from other material families. While aluminium alloys experience a rapid loss of strength when exposed to temperatures exceeding 200°C (392°F), and conventional steels become unsuitable for high-temperature applications beyond 600°C (1112°F), nickel alloys are engineered to retain their mechanical properties even at extreme temperatures over 1000°C (1832°F). Exhibiting exceptional thermal stability and outstanding creep resistance, nickel alloys can withstand deformation under prolonged stress and high temperatures.

This combination of thermal stability and resistance to creep makes these alloys vital in critical applications such as aerospace engines, where they endure intense heat and pressure, as well as in power generation turbines that operate at elevated temperatures for sustained periods.

High-strength characteristics:

High-strength characteristics enable nickel alloys to deliver exceptional mechanical performance through two key mechanisms: precipitation hardening and solid solution strengthening. Precipitation hardening involves the formation of fine particles within the alloy, which impede the movement of dislocations and thereby increase the material’s strength. Solid solution strengthening, on the other hand, occurs when the atoms of the alloying element are dissolved in the nickel matrix, effectively increasing the strength of the material. This engineering process enables superalloys like INCONEL 718 to retain high strength up to ~700 °C (1292°F), with a typical tensile strength of 1100 MPa (160 ksi) at 650 °C (1202°F). This provides the strength-to-weight ratios essential for rotating aerospace components and high-stress structural applications.

Magnetic Properties:

The magnetic properties of nickel alloys offer distinct advantages in electronics and precision instrumentation. Some alloys demonstrate controlled expansion characteristics that are essential for hermetic sealing applications, while others possess soft magnetic properties that are crucial for electromagnetic devices. Low expansion alloys, such as NILO® 36, exhibit ultra-low expansion, with thermal expansion coefficients as low as 1.56 × 10⁻⁶/°C over 20–300°C (68-572°F), achieving dimensional stability that is not attainable with other conventional materials.

Electrical resistance properties:

Electrical resistance properties of specialised nickel-chromium alloys make them essential for heating elements and resistive applications. These alloys maintain a stable electrical resistivity, ensuring consistent performance even under extreme conditions. Notably, they exhibit excellent resistance to oxidation at elevated temperatures, capable of withstanding environments typically up to ~1100–1200°C (2012-2192°F) depending on the grade.

This remarkable durability enables precise thermal control in a variety of industrial processes, including high-temperature furnaces, laboratory applications, and specialised heating systems. Operating reliably at such high temperatures without significant degradation makes nickel-chromium alloys a reliable choice for manufacturers looking to enhance efficiency and safety in thermal management solutions.

Glass sealing capabilities:

Glass sealing capabilities of controlled expansion alloys enable hermetic packaging for electronics and instrumentation. The precise matching of thermal expansion coefficients between metal and glass components ensures reliable seals that maintain integrity across temperature cycling. Reliability is crucial for critical applications, in sectors like aerospace and defence electronics, where electronic components often encounter extreme operating conditions. These sectors operate under rigorous standards, where requiring robust environmental sealing is paramount, as even minor failures can lead to catastrophic results.

Core Properties and Performance Characteristics Summary

Categories of Nickel Alloys

Nickel alloys are typically grouped by chemistry, but can also be categorised by performance, trademarked family, strengthening mechanism, or application class. These categories are not mutually exclusive, and boundaries within categories often overlap, so many alloys fall into multiple classification groups.

Classification by Chemistry and Alloy Families

Nickel alloys are commonly organised by their chemical composition and manufacturing heritage, with each family offering distinct performance characteristics.

• Commercially Pure Nickel Alloys
• INCONEL® Alloys (Nickel-Chromium Based)
• INCOLOY® Alloys (Iron-Nickel-Chromium Based)
• HASTELLOY® Alloys (Nickel-Molybdenum / Nickel-Chromium-Molybdenum Based)
• HAYNES® Alloys (Specialised High-Temperature)
• MONEL® Alloys (Nickel-Copper Based)
• NIMONIC® Alloys (Nickel-Chromium-Cobalt)
• RENE® Alloys (Aerospace Superalloys)
• WASPALOY® Alloys
• Electrical Resistance Alloys (includes Nichrome alloys)
• Controlled Expansion / Glass Sealing Alloys (NILO®)
• Specialised Performance Alloys (includes NI-SPAN® Alloys)

Classification by Strengthening Mechanism

Solid Solution Strengthened Alloys
These alloys derive their strength from the atomic distortion created by alloying elements in solid solution. Solid Solution Strengthened Nickel Alloys include INCONEL® 625 and HASTELLOY® C-276, which offer exceptional corrosion resistance without requiring heat treatment. Their excellent formability in precision strip and wire forms makes them ideal for complex aerospace components and chemical processing equipment.

Precipitation Hardened Nickel Alloys
Alloys such as INCONEL® 718 and X-750 utilise controlled precipitation of intermetallic phases to achieve remarkable strength at elevated temperatures. These alloys are essential for rotating aerospace components where strength-to-weight ratios are critical. The ability to age-harden after forming enables complex geometries whilst maintaining dimensional precision.

Classification by Application Performance

Superalloys
High-performance nickel-based alloys are engineered for extreme temperature and stress conditions, typically above 540°C (1004°F). These include INCONEL® 718, Waspaloy®, and RENÉ® 41, which maintain exceptional strength and creep resistance in gas turbine engines and aerospace applications.

Heat Resistant / High Temperature Alloys
Alloys optimised for oxidation resistance and structural stability at elevated temperatures, such as HAYNES® 230, HAYNES® 214, and INCONEL® 601. These materials resist scaling and maintain integrity in furnace environments and high-temperature processing equipment.

Corrosion-Resistant Alloys
Materials engineered primarily for chemical resistance across diverse environments, including HASTELLOY® C-276, HASTELLOY® C-22, and INCONEL® 625. These alloys excel in chemical processing, marine environments, and aggressive industrial conditions.

High Strength Alloys
Alloys developed for mechanical performance requirements, including precipitation-hardened grades like INCONEL® 718, A-286, and age-hardenable variants that provide superior strength-to-weight ratios for structural applications.

Electrical Resistance Alloys (Wire Grades)
Specialised nickel-chromium alloys designed for heating elements and electrical resistance applications. These include Ni Cr 80/20, Ni Cr 60/16, and Ni Cr 37/18, which provide controlled electrical resistivity and oxidation resistance for heating wire applications up to ~1100–1200 °C (2012-2192°F ) depending on the grade..

Controlled Expansion Alloys
Specialised alloys like NILO® 36 and NILO® 42 provide minimal thermal expansion for precision instrumentation and glass-sealing applications. These materials are irreplaceable in electronics where dimensional stability across temperature ranges is paramount.

How many nickel alloys are there?

There is no definitive number of nickel alloys, as slight variations in chemical composition can lead to distinct performance traits. The continuous demand for improved performance, safety, and efficiency in industries such as aerospace and defence, chemical processing, energy, and electronics drives the ongoing metallurgy development.

Vertically integrated producers, such as Special Metals and Haynes International, offer services that span R&D and melting through to rolling, drawing, and testing. This enables producers to meet the needs of niche applications, continuously expand the range of high-performance alloys, while keeping pace with present manufacturing challenges and those on the horizon. Behind each innovation lies an extensive and costly development process, involving carefully engineered proprietary compositions and processing techniques, resulting in a concentration of patented nickel alloys. Many of the most recognisable nickel alloys were developed as part of larger patented families, such as Inconel®, Incoloy®, Hastelloy®, Haynes®, Monel®, Nimonic®, Waspaloy®, Rene®, and Nilo®.

INCONEL®, INCOLOY®, NILO®, and NI-SPAN® are trademarks of Special Metals Corporation. HASTELLOY® and HAYNES® are trademarks of Haynes International. MONEL® and NIMONIC® are trademarks of their respective owners.

Precision Strip and Wire: Critical Forms for Advanced Applications

Nickel alloys in precision strip and wire require exceptional dimensional control, surface quality, and mechanical consistency to meet the demanding requirements of applications found in high-reliability sectors, such as aerospace and defence, energy, electronics, and battery systems. Strip products typically range from ~0.05mm to 3.0mm (0.00197” – 0.1181″) thickness with widths up to ~600mm (23.62”), and Wire is produced from ~0.025 mm (0.0098″) diameter upwards for ultra-fine applications.

Strip manufacturing combines multi-stage cold rolling, annealing, and precision finishing to maintain tight thickness and flatness targets. Thickness tolerances as tight as ±0.01 mm are achievable on thin strip in suitable tempers and widths. Edge quality and surface finish are controlled for the end-use.

Wire production uses controlled multi-pass drawing and intermediate annealing to deliver consistent diameter, mechanical properties and surface condition across long lengths—vital for coilability and downstream forming. Ultra-fine nickel wire, with a diameter of 0.025 mm (0.0098″), is routinely supplied for use in electronics and sensor leads.

As a leading nickel-alloy specialist, the Knight Group supplies 50+ grades of precision strip and wire to suit demanding applications. For compliance-driven programs, products can typically be supplied to European/British/ASTM/AMS specifications or other standards by request.

Guide to Commercially Pure Nickel Alloys

Our products:

Nickel 200 / N02200: precision strip and wire (resistance wire included).

Nickel 201 /N02201: precision strip and wire

Nickel 212 / N02212: precision wire only

Quick Selection Guide:

Choose commercially pure nickel (200/201) for applications requiring maximum conductivity, deep draw/spin forming, caustic environments, or where magnetic properties are beneficial.

• Service below 315°C (599°F) – Nickel 200.
• Service above 315°C (599°F) or design-coded pressure service – Nickel 201

Choose Nickel 212 for electrical and electronic applications needing reliability and durability, high strength, good thermal conductivity, and corrosion resistance.

Why choose commercially pure nickel?

Commercially pure nickel grades are the first choice when you need high electrical and thermal conductivity, excellent workability, and reliable performance in reducing and caustic environments—in precision strip and wire forms.

Advantages of commercially pure nickel (Nickel 200/201 family)

• High conductivity: ~ 18 to 20 percent IACS in annealed condition—significantly higher than most alloyed nickel grades and stainless steels.
• Formability and fabrication: Low work-hardening rate with excellent weldability; supports deep drawing, spinning, and complex forming in strip and wire.
• Caustic service: Outstanding resistance in sodium and potassium hydroxide, with very low corrosion rates up to about 73 percent in sodium hydroxide (NaOH) and proven performance even in hot anhydrous caustic (grade selection depends on temperature)
• Magnetic properties: Commercially pure nickel is ferromagnetic at room temperature, with a Curie point near 360 °C (680°F), useful for specific applications such as magnetic and sensor designs.
• Cost-effective purity: Minimal alloying additions help control cost where ultra-high temperature strength or specialised alloy effects are not required.

Applications & Sectors

• Chemical processing: Caustic evaporators/concentrators, reactors, drums, heat-exchange components.
• Electronics & energy: Battery interconnects and connectors (Ni 200/201 strip), lead/lead-in wires and electrodes (Ni 212 wire).
• Aerospace & heat treatment: Where conductivity, cleanliness and reliable fabrication are required.

Commercially pure nickel grades at a glance

Nickel 200 (N02200 / 2.4066) — precision strip and wire

What it is: Nickel 200 is a general-purpose commercially pure nickel for service up to ~315°C (599°F). It combines high electrical and thermal conductivity with excellent resistance to caustic alkalies and performs well in reducing, non-oxidising media. It is ferromagnetic at room temperature and is readily formed and welded in both strip and wire. Use Nickel 201 above ~315°C (599°F) to avoid graphitisation.

Use it for: Chemical processing hardware, electrical components, caustic handling, and general fabricated strip and wire parts.

→ Get a Quote | → Chemical Composition of Nickel 200 | → Mechanical Properties of Nickel 200 Strip | → Mechanical Properties of Nickel 200 Wire

Nickel 201 (N02201 / 2.4068) — precision strip and wire

What it is: Nickel 201 is the low-carbon version of Nickel 200 (carbon 0.02% max) engineered for elevated-temperature applications. It retains essentially the same aqueous corrosion profile as Nickel 200 but is the preferred grade above ~315°C (599°F). Some producers document successful service in dry chlorine and dry hydrogen chloride to approximately 500–540°C (932-1004°F), and use in laboratory crucibles in oxidising furnace atmospheres to ~1100°C (2012°F), subject to conditions. It also work-hardens more slowly, aiding severe forming.

Use it for: Prolonged high-temperature service

→ Get a Quote | → Chemical Composition of Nickel 201 | → Mechanical Properties of Nickel 201 Strip | → Mechanical Properties of Nickel 201 Wire

Nickel 212 (N02212 / 2.4110) — precision wire only

What it is: Nickel–manganese grade designed for higher strength than pure nickel while retaining good conductivity and weldability. Typical uses include electrical lead/lead-in wires, lamp components and electrodes. In practice it is supplied as precision wire; resistivity at 20°C (68°F) is commonly reported around ~10.9 μΩ• cm. (66 ohm circ mil/ft).
Use it for: Lead/lead-in wires, lamp supports, electrodes and related electrical components.

→ Resistance/lead-wire enquiry | → Chemical Composition of Nickel 212 | → Mechanical Properties of Nickel 212 Strip | → Mechanical Properties of Nickel 212 Wire

Quick Links:

→ Get a Quote 

→ Chemical Composition of Commercially Pure Nickel Alloys

→ Mechanical Properties of Commercially Pure Nickel Strip

→ Mechanical Properties of Commercially Pure Nickel Wire

→ Commercially Pure Nickel Applications and Features

Guide to INCONEL® Alloys (Nickel-Chromium Based Alloys)

Our products:

INCONEL® 600 / N06600 / 2.4816: precision strip and wire

INCONEL® 601 / N06601 / 2.4851: precision strip and wire

INCONEL® 625 / N06625 / 2.4856: precision strip and wire

INCONEL® 718 / N07718 / 2.4668: precision strip and wire

INCONEL® X-750 / N07750 / 2.4669: precision strip and wire

Quick Selection Guide:

Choose INCONEL® 600/601 for high-temperature oxidation resistance, carburisation resistance, and applications in furnace components and heat treatment equipment. (601 offers best-in-class oxidation/spalling resistance).
Choose INCONEL® 625 for superior corrosion resistance in marine environments, chemical processing, and aerospace applications requiring high strength at elevated temperatures.
Choose INCONEL® 718/X-750 for high-temperature structural applications requiring exceptional strength retention, such as gas turbine components and aerospace fasteners.

Nickel-Chromium Alloys

.Nickel–chromium alloys are engineered for service where components must retain strength and resist oxidation at elevated temperatures. Chromium promotes a thin, adherent oxide film that protects the metal in hot air and combustion atmospheres, while the nickel matrix provides toughness, corrosion resistance and fabrication ease. This  combination gives Ni–Cr alloys an advantage when thermal cycling, carburising or chloride-bearing environments push conventional materials beyond their limits, Typical uses span thermal processing equipment, chemical processing and desalination, power generation and oil & gas, aerospace and defence, and high-performance automotive hot-end components.

Supplied in precision strip and wire, these alloys offer a dependable combination of high-temperature integrity, oxidation/scale resistance and ease of fabrication-friendly, with specific grades chosen to match the balance of corrosion resistance and strength your application requires. INCONEL® alloys are among the most recognised commercial families of nickel-chromium alloys.

Why choose INCONEL® alloys?

INCONEL® alloys are the go-to choice when your application requires exceptional high-temperature strength, outstanding oxidation resistance, and reliable performance in the most demanding corrosive environments—available in precision strip and wire forms. Compared with standard stainless steels, they extend the operating window in hot, aggressive, or chloride-bearing environments.

Within the family, there are two broad types:

• Solid-solution strengthened alloys (e.g., INCONEL® 600, 601, 625) that rely on carefully balanced alloying to deliver oxidation resistance and, in the case of 625, wide-spectrum corrosion resistance from cryogenic to elevated temperatures.
• Precipitation-hardened alloys (e.g., INCONEL® 718, X-750) that add aluminium, titanium and niobium to form strengthening precipitates, giving very high strength and good creep/relaxation resistance in long-term hot service.

INCONEL® is a registered trademark of Special Metals Corporation.

Quick Links:

→ Get a Quote 

→ Chemical Composition of INCONEL® Alloys

→ Mechanical Properties INCONEL® Strip

→ Mechanical Properties of INCONEL®Wire

→ INCONEL® Applications and Features

Guide to INCOLOY® Alloys (Nickel-Iron-Chromium Based Alloys)

Our products:

INCOLOY® 800 / N08800 / 1.4876: precision strip and wire

INCOLOY® 825 / N08825 / 2.4858: precision strip and wire

INCOLOY® A-286 / S66286 / 1.4980: precision strip and wire

INCOLOY® 925 / N09925: precision strip and wire

Quick Selection Guide:

Choose INCOLOY® 800 for general high-temperature service with oxidation and carburisation resistance; suitable for load-bearing service up to about 815 °C (1500 °F). For applications where creep-rupture governs (especially above ~600–650 °C), specify 800H/800HT instead of 800.

Choose INCOLOY® 825 for superior aqueous-corrosion resistance in mixed reducing/oxidising media (sulfuric, phosphoric, seawater, chlorides). It is generally selected for corrosion service rather than high-temperature creep duties; avoid prolonged exposure above about 540 °C (1000 °F) because microstructural changes reduce ductility/impact strength.

Choose INCOLOY® A-286 for high-strength aerospace and gas-turbine components; age-hardenable with excellent mechanical properties for high-strength service to about 700 °C (1300 °F).

Choose INCOLOY® 925 (age-hardenable) for demanding oil-and-gas downhole/surface components requiring high strength and resistance to H₂S/CO₂ sour environments.

Nickel-Iron-Chromium Based Alloys

Nickel-iron-chromium alloys balance nickel’s toughness and chloride stress-corrosion cracking with chromium’s oxidation protection at high temperatures and the cost-effectiveness of iron. The result is a group of alloys that bridge the gap between austenitic stainless steels and higher nickel content superalloys, offering enhanced high-temperature and oxidation/carburisation resistance and lower thermal expansion than the popular 300-series stainless steels (e.g., α≈14.1–14.4 µm/m·°C at 100 °C (572°F) for 825/800 vs ~17 µm/m·°C typical for 304).

Supplied as precision strip and wire, nickel-iron-chromium grades are widely used in thermal processing, petrochemical, power generation and chemical processing—e.g., furnace fixtures, heaters/heat-treat equipment, heat-exchanger tubing, and electrical-heater sheathing.

800 Series Nickel Alloys

Designed to withstand the harsh conditions of the petrochemical industry, 800-series nickel alloys are optimised for high-temperature service in furnaces and petrochemical heaters. 800H and 800HT feature controlled carbon (and for 800HT, controlled Al+Ti) to optimise creep-rupture strength at elevated temperatures.

Why choose INCOLOY® alloys?

INCOLOY® alloys are the preferred choice when your application demands reliable high-temperature performance, excellent oxidation resistance, and enhanced resistance to carburisation and reducing environments—available in precision strip and wire forms. They offer superior performance compared to conventional austenitic stainless steels in high-temperature service whilst providing economic advantages over high-nickel alloys where appropriate.

• High-temperature capability (grade-specific): 800 is used for strength to ~815°C (1499°F); 800H/800HT are selected where creep-rupture governs; A-286 provides high strength to ~700°C (1292°F); 825 is not used where creep-rupture governs and should avoid >~540°C (1004°F); 925 retains useful strength to ~650°C (1202°F) but is chosen primarily for sour-service corrosion plus strength.
• Oxidation & carburisation resistance: Excellent at elevated temperature in the 800-series; selection among 800/800H/800HT depends on temperature/stress regime.
• Thermal-expansion compatibility: Coefficients closer to carbon/low-alloy steels than 300-series stainless, aiding dissimilar joints and reducing thermal stress.
• Aqueous-corrosion performance: Outstanding in 825 across reducing/oxidising chemistries; 925 adds sour-service SSC/SCC resistance with high strength.
• Fabrication: Good formability and weldability are achieved using conventional techniques (see Special Metals for guidance on filler metals).
• Cost/performance balance: Significant Fe content often makes INCOLOY alloys a more economical choice than higher-Ni superalloys when the duty allows. 

What is the difference between INCONEL® and INCOLOY® alloys?

Both are families of nickel-based alloys from Special Metals. INCONEL® grades typically have a higher nickel content and target extreme high-temperature strength/oxidation resistance. INCOLOY® grades are nickel-iron-chromium alloys that balance high-temperature corrosion resistance with cost and thermal-expansion considerations.

INCOLOY® alloys vs INCONEL® alloys

The iron content in INCOLOY® alloys is strategically optimised to provide thermal expansion characteristics that closely match those of carbon and low-alloy steels, making them ideal for applications involving dissimilar metal joining. In comparison, INCONEL® alloys have a much higher nickel content, resulting in superior performance at higher temperatures. However, when it comes to material selection, INCOLOY® alloys offer a more economical solution for high-temperature/ corrosive applications that do not need the extended service range of INCONEL® alloys.

Selection criteria

Choose INCONEL® alloys for applications requiring excellent strength and corrosion resistance in extreme environments,
Choose INCOLOY® alloys for applications requiring a balance of high-temperature strength, oxidation and carburisation resistance properties at a lower cost.
INCONEL® and INCOLOY® are registered trademarks of Special Metals Corporation.

Quick Links:

→ Get a Quote 

→ Chemical Composition of INCOLOY® Alloys

→ Mechanical Properties INCOLOY® Strip

→ Mechanical Properties of INCOLOY®Wire

→ INCOLOY® Applications and Features

Guide to HAYNES® Alloys (Cobalt and Nickel-Based Superalloys)

Our products:

HAYNES® 25 / R30605 / 2.4964: precision strip and wire
HAYNES® 188 / R30188 / 2.4683: precision strip and wire
HAYNES® 214® / N07214 / 2.4646: precision strip and wire
HAYNES® HR-224®: precision strip only
HAYNES® 230® / N06230 / 2.4733: precision strip and wire
HAYNES® 233®: precision strip only
HAYNES® 242® / N10242: precision strip and wire
HAYNES® 263 / N07263  /2.4650: precision strip and wire
HAYNES® 282® / N07208: precision strip and wire
HAYNES® HR-120® / N08120 / 2.4854: precision strip and wire

Quick Selection Guide:

Choose HAYNES® 25 for excellent high-temperature strength combined with good resistance to oxidising environments up to 980°C (1800°F); the strongest of the fabricable cobalt-base alloys with outstanding resistance to metal galling and cavitation. However, it exhibits thermal instability at intermediate temperatures and has largely been superseded by newer alloys for aerospace applications.

Choose HAYNES® 188 for superior high-temperature strength with excellent oxidation resistance up to 1095°C (2000°F); ideal for combustor liners and gas turbine components that require outstanding fabricability, weldability, and better thermal stability compared to HAYNES® 25. Excellent for prolonged high-temperature service.

Choose HAYNES® 214® for optimum high-temperature oxidation resistance in wrought austenitic materials at temperatures of 955°C (1750°F) and above; forms tightly adherent (Al₂O₃) alumina-type protective oxide scale whilst allowing conventional forming and joining. Susceptible to strain-age cracking at intermediate temperatures.

Choose HAYNES® HR-224® for excellent oxidation resistance with improved fabricability and weldability compared to HAYNES® 214®; it achieves superior oxidation resistance through alumina protective scale formation whilst exhibiting excellent ductility and formability characteristics with enhanced weldability.

Choose HAYNES® 230® for an unparalleled combination of high-temperature strength, outstanding oxidation resistance up to 1149°C (2100°F), and excellent long-term thermal stability; a solid-solution-strengthened alloy with superior resistance to grain coarsening and lower thermal expansion than most high-temperature alloys.

Choose HAYNES® 233® (age-hardenable) for an exceptional combination of excellent oxidation resistance up to 1149°C (2100°F) and superior creep strength; readily fabricable with good hot workability, cold formability, and weldability whilst maintaining excellent high-temperature performance.

Choose HAYNES® 242® (age-hardenable) for applications requiring high strength up to 705°C (1300°F) with exceptionally low thermal expansion characteristics; excellent oxidation resistance up to 815°C (1500°F), outstanding low-cycle fatigue properties, and superior resistance to fluorine-containing environments.

Choose HAYNES® 263 (age-hardenable) for applications up to 900°C (1650°F) requiring good age-hardened strength with excellent fabrication characteristics in the annealed condition; it combines intermediate temperature strength with superior fabricability compared to Waspaloy and R-41 alloys.

Choose HAYNES® 282® (gamma-prime strengthened) for exceptional creep strength in the 649–927°C (1200–1700°F) range with outstanding weldability and fabricability; surpasses Waspaloy and approaches Rene 41 strength while maintaining excellent resistance to strain-age cracking.

Choose HAYNES® HR-120® for excellent strength at elevated temperatures up to 1095°C (2000°F), combined with excellent resistance to carburising and sulphidising environments; significantly higher strength than conventional Fe-Ni-Cr materials whilst maintaining comparable oxidation resistance.

Cobalt and Nickel-Based Superalloys

HAYNES® alloys represent the pinnacle of superalloy technology, engineered to withstand the most demanding high-temperature and corrosive environments. These advanced cobalt and nickel-based materials combine exceptional strength, oxidation resistance, and thermal stability, making them suitable for applications where conventional materials fail.

High-Temperature Cobalt-Based Alloys
The cobalt-based HAYNES® alloys (HAYNES® 25, 188) are specifically designed for extreme high-temperature service, where superior strength retention and oxidation resistance at extremely high temperatures are paramount. These solid-solution-strengthened alloys maintain their mechanical properties at temperatures where other materials lose structural integrity, making them indispensable for aerospace and industrial gas turbine applications.

In contrast, the nickel-based grades encompass a comprehensive range from solid-solution-strengthened (230®, HR-120®) to age-hardenable (233®, 242®, 263), gamma-prime strengthened (282®), and advanced alumina-forming alloys (214®, HR-224®).

Advanced Nickel-Based Alloys
HAYNES® nickel-based superalloys incorporate sophisticated metallurgical principles, including solid-solution strengthening (230®, HR-120®), age-hardening mechanisms (233®, 242®, 263), gamma-prime precipitation hardening (282®), and advanced alumina-forming chemistry (214®, HR-224®). These diverse strengthening mechanisms provide tailored performance for specific demanding high-temperature applications whilst maintaining excellent fabricability.

Alumina-forming oxidation alloys: (214®, HR-224®, 233®)
214® and HR-224® (and the newer 233®) rely on aluminium to form a tenacious alumina scale for exceptional oxidation resistance at very high temperature; HR-224® improves fabrication and weldability compared with 214®.

Solid-solution Ni-Cr-W/Mo alloys for oxidation/carburisation (230®, HR-120®)
230® (Ni–Cr–W–Mo) offers a strong combination of oxidation, nitridation and carburisation resistance with good fabrication, making it a go-to alloy for furnace and hot gas path hardware. HR-120® (Fe–Ni–Cr with Co, Mo, W) targets carburising and sulphidising atmospheres while retaining higher strength than many Fe–Ni–Cr grades.

Age-hardenable high-strength alloys (242®, 263, 282®):

Gamma-prime strengthened (Ni–Co–Cr–Mo with Al/Ti) 263 and 282® deliver age-hardened strength; 282® is optimised for superior creep performance around 650–925 °C (1202–1697 °F) with excellent fabricability, while 263 balances strength and weldability to around 900 °C (1652 °F).

Long-range ordering (Ni–Mo–Cr) 242® achieves high strength in the 650–705 °C (1202–1301 °F) band and very low thermal expansion after ageing; ideal where dimensional stability matters.

Supplied as precision strip and wire, HAYNES® alloys are extensively used in aerospace propulsion, industrial gas turbines, power generation, and petrochemical processing—applications including combustor liners, transition ducts, combustors, transition ducts, vanes, seals and hot-gas-path components, heat exchangers, high-temperature furnace components, and chemical processing equipment.

Why choose HAYNES® alloys?

HAYNES® alloys are the preferred choice when your application demands exceptional high-temperature performance, superior oxidation resistance, and proven reliability in the harshest environments—available in precision strip and wire forms. They offer unmatched performance for critical applications where failure is not an option.

• Superior high-temperature capability (grade-specific): HAYNES® 25 provides strength to ~980°C (1796°F); 188 offers excellent strength to ~1095°C (2003°F); 214®/HR-224® excel at ~955°C+ (1750°F+); 230® delivers outstanding performance to ~1149°C (2100°F); 233® combines strength and oxidation resistance to ~1149°C (2100°F); 242® provides high strength to ~705°C (1300°F); 263 offers strength to ~900°C (1650°F); 282® excels in creep applications from 649–927°C (1200–1700°F); HR-120® delivers strength to ~1095°C (2000°F).
• Exceptional oxidation & environmental resistance: Outstanding performance in oxidising environments with protective scale formation; 214®/HR-224® form adherent (Al₂O₃) alumina scales; 230® offers premier nitriding resistance; 188 provides excellent sulphidation resistance; 242® excels in fluorine-containing environments; HR-120® resists carburising and sulphidising conditions.
• Advanced strengthening mechanisms: Solid-solution strengthening in 25/188/230®/HR-120® provides thermal stability; age-hardening in 233®/242®/263 enables optimal strength/fabricability balance; gamma-prime strengthening in 282® delivers exceptional creep resistance with maintained weldability; alumina-forming chemistry in 214®/HR-224® provides extreme oxidation resistance.
• Thermal stability & microstructural integrity: Superior resistance to grain coarsening, phase instability, and microstructural degradation during prolonged high-temperature exposure compared to conventional alloys.
• Superior fabrication characteristics: Excellent formability and weldability using conventional techniques; 282® offers outstanding resistance to strain-age cracking; age-hardenable grades provide optimal fabricability in annealed condition; alumina-forming alloys maintain conventional processing despite high aluminium content.
• Performance/cost optimisation: Tailored chemistry provides the precise balance of properties required for demanding applications, delivering reliable service life and reduced maintenance costs across diverse operating environments.

HAYNES® alloys are registered trademarks of Haynes International, Inc.

Quick Links:

→ Get a Quote 

→ Chemical Composition of HAYNES® Alloys

→ Mechanical Properties HAYNES® Strip

→ Mechanical Properties of HAYNES®Wire

→ HAYNES® Applications and Features

Guide to MONEL® Alloys (Nickel-Copper Alloys)

Our products:

MONEL® alloy 400 / N04400 / 2.4360–2.4361: precision strip and wire
MONEL® alloy K-500 / N05500 / 2.4375: precision strip and wire

Quick Selection Guide:

Choose MONEL® 400 when you need broad corrosion resistance in seawater and brackish service, strong performance in reducing acids (including hydrofluoric), and good toughness from cryogenic temperatures upward. It is a single-phase nickel-copper solid solution that hardens only through cold work—ideal for springs, pump and valve components, heat-exchanger hardware, and fasteners in marine and chemical applications.

Choose MONEL® K-500 when you need the same corrosion profile as 400 but with significantly higher strength and hardness from precipitation hardening (aluminium and titanium additions). K-500 is commonly used for shafts, fasteners, springs and down-hole tools; it is essentially non-magnetic to very low temperatures and is widely applied in sour-gas service where specified. Note: In some media, age-hardened K-500 shows a higher tendency to stress-corrosion cracking than 400—consider this in design.

Nickel-Copper Alloys:

Nickel-copper alloys are single-phase (face-centred cubic) solid solutions across the full Ni–Cu range. This metallurgy gives them excellent resistance to rapidly flowing seawater, excellent behaviour in reducing environments, and functional strength without heat treatment. MONEL 400 is the archetype, typically containing roughly one-third copper; MONEL K-500 adds controlled amounts of aluminium and titanium for precipitation strengthening, while retaining the 400 corrosion profile.

Why choose MONEL® alloys?

Seawater & marine service: Very low general corrosion in fast-flowing seawater (400 and K-500); proven for pump shafts, propeller shafts and fasteners.

Reducing acids & caustics: Outstanding resistance to hydrofluoric acid and good performance in many reducing media, making it suitable for alkali handling.

Cryogenic toughness: High strength with retention of ductility down to cryogenic temperatures.

Strength options: Alloy400 for cold-worked strength; K-500 for precipitation-hardened high strength and spring performance.

Non-magnetic options: Alloy K-500 is effectively non-magnetic down to very low temperatures, making it useful for instrumentation and down-hole tools.

MONEL® 400 vs MONEL® K-500

Strengthening: 400 work-hardens only; K-500 is age-hardened (gamma-prime Ni₃(Al,Ti)) for much higher tensile and fatigue strength.

Corrosion: Similar overall resistance; K-500 can be more sensitive to stress-corrosion cracking in some conditions when age-hardened.

Typical uses: 400 for heat-exchanger hardware, marine fittings, tanks; K-500 for high-strength shafts, fasteners, springs, and sour-service components.

Quick Links:

→ Get a Quote 

→ Chemical Composition of MONEL® Alloys

→ Mechanical Properties MONEL® Strip

→ Mechanical Properties of MONEL®Wire

→ MONEL® Applications and Features

Within both the scientific and lighting industry, glass-to-metal seals present a key challenge to manufacturers. Controlled Expansion Alloys expansion characteristics match both borosilicate (or Pyrex) glasses and alumina ceramics and therefore provide an ideal solution for components that incorporate a hermetic (glass to metal) seal and require good thermal conductivity. Equally, these alloys offer some more unusual characteristics, including their high strength, a low coefficient of thermal expansion and resistance to shock and cracking. As a result, Controlled Expansion Alloys also have significant benefits to electronic manufacturers and can be found in many electrical components and devices such as semiconductors and circuits, thermostat strips and rods, electric bulbs and industrial lamps.

Nickel-Chromium-Cobalt Alloys were introduced in the 1940s for Aerospace applications and now is commonly found in industrial thermal processing, furnace components and heat-treatment equipment. These grades are best suited for applications requiring oxidation and scaling resistance coupled with medium strength at high operating temperatures. Alloy 75 or Nimonic 75 is a Nickel Chromium Alloy, strengthened with the addition of titanium. It provides excellent corrosion resistance at elevated temperatures and is primarily used in low-stress, elevated-temperature conditions, which require some oxidation resistance. This grade remains popular for aerospace applications such as fasteners, in part due to its ease of fabrication and formability. Alloy 90 or Nimonic 90 is another popular aerospace grade nickel-chromium alloy with the addition of cobalt. The alloy is precipitation hardenable and has high strength and corrosion resistance at very high temperatures (up to 950 °C). Other beneficial properties include high-stress rupture strength and high creep resistance at high temperatures making it suitable for a variety of applications in challenging environments.

The optimum condition for alloy 601 depends on the type of application and the service temperature involved. In general, the solution-treated condition is used for rupture-limited applications (temperatures of about 1000°F (540°C) and higher)