Martensitic Stainless Steel Grades - Knight Group

Martensitic Stainless Steel Alloys are best known for their high strength while also offering a combination of good corrosion and heat resistance. Unlike many other Stainless Steel grades, Martensitic grades can be hardened by quenching and tempered, further improving toughness and ductility.

Available Martensitic Precision Grades:

410 / 1.4006 / S 41000

420 / 1.4028 / S 42000

431 / 1.4057 / S43100

What are the benefits of using martensitic stainless steel?

High strength, good toughness, and good heat resistance

Hardened by quenching and tempered to give improved toughness and ductility

What are the disadvantages of using martensitic stainless steel?

Less resistant to corrosion compared to Austenitic and Ferritic grades.

Limited formability and welding capabilities

Martensitic Stainless Steel is a low cost form of Stainless metal strip. These alloys are magnetic and are generally formed in the annealed condition, then heat treated. Martensitic grades typically contain 12-15% Chromium, with Carbon as the key alloying element. Carbon content can range from as low as 0.1% to over 1%. The variation in the Carbon content, in addition to the other possible alloying elements, provides this group with a wide range of desirable mechanical properties. Whilst not as popular as other Stainless Steel grades, Martensitics offer high strength, good toughness, and good heat resistance. These grades also possess a moderate to good corrosion resistance, depending on the their Chromium content. Moreover, the higher Chromium content in some Martensitic grades, such as 431, offer a similar level of corrosion resistance to the Austenitic grade 304.

Martensitic grades equally share similarities with some Carbon Steels. To improve toughness and ductility, they undergo a hardening process of quenching and tempering. Ultimately, it is the Carbon content of the alloy increases the strength properties. However, increasing Carbon to increase strength, consequently comes at the expense of toughness and ductility.

As a result of its low cost and moderate corrosion resistance, this group is ideal for many applications. In fact it was the first to be commercially developed as cutlery steel. However, it is its high strength and toughness properties that result in Martensitic grades being found across multiple industry sectors. Uses include surgical instruments within hospitals, valves, pumps and other components for the Oil and Gas industry, through to turbines and gears in Aerospace manufacturing. Furthermore, these grades are highly useful for manufacturing complex spring shapes, requiring a soft steel for forming.

Martensitic Stainless Steel Material Chemical Composition
European Designation EN 10088-2 2014Former BS Standard (Wire Only)American Designation (ASTM)TYPICAL CHEMICAL COMPOSITION %
NumberNameBS 1554 1990 nearest fitAISI nearest fitUNS nearest fitCSiMnPSCrMoNiNCuOther
1.4006X12 Cr 13410S21410S 410000.08 - - 13.5-0.75---
1.4028X30 Cr 13420S45420S 420000.26 - 0.351. - 14.0-----
1.4122X39CrMo17-1---0.33 - 0.451. - 17.50.8 - 1.31.0---
Martensitic Stainless Steel Strip Mechanical Properties Annealed Stainless Steel
European Designation EN 10088-2 2014Former BS Standard (Wire Only)American Designation (ASTM)Proof Strength 0.2% Min (N/mm2)Tensile StrengthElong. % Min. (50mm Gauge Length)Hardness Max (VPN)Surface Finish
NumberNameBS 1554 1990 nearest fitAISI nearest fitUNS nearest fit
1.4006X12 Cr 13410S21410S 41000450650 - 850152312B & 2R
1.4028X30 Cr 13420S45420S 42000650850 - 1000102582B & 2R
1.4122X39CrMo17-1---Mechanical Data is dependent on temper and thickness. Pease get in touch to find out further information.
Martensitic Stainless Steel Wire Mechanical Properties Annealed Stainless Steel
European Designation EN 10088-2 2014Former BS Standard (Wire Only)American Designation (ASTM)Maximum tensile strength N/mm²
NumberNameBS 1554 1990 nearest fitAISI nearest fitUNS nearest fitWire dia 13.0 – 6.0mmWire dia 6.00 – 1.50mmWire dia 1.50 – 0.50mmWire dia 0.50 – 0.10mm
1.4006X12 Cr 13410S21410S 41000700700750780
1.4028X30 Cr 13420S45420S 42000780780800820
1.4122X39CrMo17-1---Not available as wire. Strip products available
Martensitic Stainless Steel Material Features and Applications
European Designation EN 10088-2 2014Former BS Standard (Wire Only)American Designation (ASTM)Key FeaturesKey MarketsApplications
NumberNameBS 1554 1990 nearest fitAISI nearest fitUNS nearest fit
1.4006X12 Cr 13410S21410S 41000This magnetic Martensitic Stainless Steel grade is ideal for applications where strength, hardness and wear resistance is required. It is corrosion resistant in water and steam and offers moderate corrosion resistance overall. It is work hardenable to improve strength and ductility. However, it is not generally considered to be weldable, although it is possible with thin gauge material. 410 (1.4006) is the most commonly used Martensitic Stainless Steel grade.Medical, MechanicalStainless Steel Springs, Valves, Axles, Surgical Instruments, Wear Resistant Surfaces, Micrometre Parts, Compressor Parts, Fasteners, Springs, Pins, Cutlery
1.4028X30 Cr 13420S45420S 42000This Martensitic Stainless Steel grade offers similar corrosion resistance to alloy 410 (1.4006), but with improved hardness and strength. It is particularly useful for applications in which wear and abrasion resistance is important. This alloy also has magnetic properties.Medical, Springs & Pressings, Printing Industry, MechanicalSurgical and Dental instruments, Cutlery, Machine Knives, Scissors, Measuring Tools, Springs, Mechanical Parts, Fasteners
1.4122X39CrMo17-1---Martensitic Stainless Steel grade 1.4122 is the most corrosion resistant of the common Martensitic grades. In moderately corrosive, low chloride containing environments, this alloy can provide good resistance. It also offers medium to high hardness and very good wear resistance and mechanical properties overall.Medical, Food, MechanicalSurgical Instruments, Pumps, Mechanical Parts, Food Processing

All data is provided for informational purposes only. In no event will the Knight Group and its subsidiaries, be liable for in respect of any action taken by any third party arising from using the information taken from our online or printed sources. Chemical and Mechanical Properties should not be construed as maximum or minimum values for specifications, nor should information be used to assess suitability for a particular use or application. The information and data provided is deemed to be accurate to the best of our knowledge and may be revised anytime without notice and assume no duty to update

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