Mild And Carbon Steel Precision Wire - Knight Group

Mild and Carbon Steel Grades

Normal Duty Static Wire: NS1 / NS2

Normal Duty Dynamic Wire: ND1 / ND2/ ND3

High Duty Dynamic Wire: HD1 / HD2 / HD3

High Duty Static Wire: HS1 / HS2 / HS3

High Duty Static and Dynamic Wire (Music Grade): M4 / M5

High Tensile Static Wire

High Tensile Dynamic Wire

Medium Tensile Static Wire

Medium Tensile Dynamic Wire

Low Tensile Static Wire

What are the benefits of using Mild And Carbon Steel?

Carbon Steel is an affordable, strong and durable material, offering shock resistant properties. It is also easily recycled and reused, making it a more environmentally friendly material choice

What are the disadvantages of using Mild And Carbon Steel?

Carbon Steel, is also more susceptible to rust and corrosion, limiting its use for certain applications

Carbon and Mild Steels
Mild and Carbon Steel Overview

Many manufacturers explore the use of Carbon Steels due to its low cost and the considerable physical properties of high formability, high hardness and excellent fatigue strength. However, it suffers from poor corrosion and oxidation resistance, so is generally only used in undemanding environments. Typical applications include springs, piano strings and lock levers. Carbon steels are available in low carbon and high carbon conditions.


Knight Precision Wire are specialist manufacturers of Wire and Cable and can provide free quotations on your requirements. Please get in touch to arrange this.

Low Carbon and Mild Steel Wire

The hardness or temper of cold rolled mild steel wire is determined by its analysis, the amount of cold rolling or by a final annealing process. Manufacturers select these Steel to achieve the optimum mechanical properties for the forming operation, whether it be deep drawing, forming or flat blanking.


“Skin passed” is a very light rolling reduction after the annealing process to prevent the formation of deformation bands called stretcher strains, which can ruin surface appearance of the formed article.


Mild steels cannot be hardened except by cold working because their carbon content is too low for significant heat treatment reaction to take place. However, they can be case hardened to give a harder surface.

Low Carbon Steel Chemical Properties
BS 1052 : 1980C (max)MnS (max)P (max)
0.180.40 – 1.000.050
Low Carbon Steel Mechanical Properties
TemperTensile Strength (N/mm²)
Annealed500 max
Lightly Drawn400 – 550
Hard Drawn500 – 950
Low Carbon Steel Key Features and Applications
BS 1052FeaturesApplications
Low tensile strength, good formability.Wire baskets, florist wire, hangers, tie wire.
High Carbon Spring Steel Wire

High Carbon Steel is available in several forms:


(a) Annealed:

Bright rolled Carbon Steels are often used in the annealed condition for forming of components. These can then be batch heat treated to increase their hardness and spring characteristics. To maintain a good surface condition, heat treatment should be carried out in a controlled atmosphere furnace at the appropriate temperature for the grade (see table) and oil quenched to achieve maximum hardness. Tempering must then be carried out to reduce the strength/hardness of the material but considerably improve its toughness and ductility. Temperatures in the range of 300 – 450°C should be used to achieve the required final hardness. Alternatively, austempering is frequently carried out by quenching into a molten salt bath @ 350 – 450°C. Our Sales and Technical staff will give additional heat treatment advice for your particular application, upon request.


(b) Hardened & Tempered:

Hardened & Tempered Spring Steel has been heat treated in strip form at the mill, prior to being supplied to the customer. Many applications do not require severe bending and forming and it is often beneficial to use hardened and tempered strip in these cases. The main benefits are: No risk of distortion. Uniformity of surface finish. Constant mechanical properties. These factors often mean reduced processing costs and a higher quality product Stress Relieving. After severe deformation hardened & tempered spring steel requires a low temperature (250 – 300°C) stress relieving operation to “set” the components into shape. This will impart a coloured oxide finish ranging from bronze to blue which slightly improves corrosion resistance.

Chemical Composition: European Grade Designations
SL : Low tensile static | DM : Medium tensile dynamic | SM : Medium tensile static | DH : High tensile dynamic | SH : High tensile static
EN 10270-1 : 2001C (a)SiMn (b)P (max)S (max)Cu (max)
SL, SM, SH0.35 – 1.000.10 – 0.300.50 – 1.200.0350.0350.2
DM, DH0.45 – 1.000.10 – 0.300.50 –
(a) A wide range is stipulated to accommodate the whole range of sizes. For individual sizes, the carbon range is substantially more restricted. (b) The range of manganese content is wide to cope with various processing situations and the broad size range. The actual figures per size small are more restricted.
Chemical Composition: British Grade Designations
NS : Normal duty static | ND : Normal duty dynamic | HS : High duty static | HD : High duty dynamic | M : High duty static and dynamic (music grade)
BS 5216 : 1991CSi (max)MnP (max)S (max)
NS, HS0.35 – 0.850.350.40 –
ND, HD0.45 – 0.850.350.30 –
M0.60 – 1.000.350.25 – 0.750.030.03

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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