Available in wire
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.
As part of the Knight Group, Precision EU are specialist suppliers manufacturers of Wire and Cable and can provide free quotations on your requirements. Please get in touch to arrange this.
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.
|CHEMICAL COMPOSITION OF LOW CARBON STEEL|
|BS 1052 : 1980||C (max)||Mn||S (max)||P (max)|
|0.18||0.40 – 1.00||0.05||0|
|MECHANICAL PROPERTIES OF LOW CARBON STEEL WIRE|
|Temper||Tensile Strength (N/mm²)|
|Lightly Drawn||400 – 550|
|Hard Drawn||500 – 950|
|CHARACTERISTICS AND APPLICATIONS OF OF LOW CARBON STEEL WIRE|
|Low tensile strength, good formability.||Wire baskets, florist wire, hangers, tie wire.|
High Carbon Steel (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.
|HIGH CARBON STEEL CHEMICAL COMPOSITION|
|SL : Low tensile static | DM : Medium tensile dynamic | SM : Medium tensile static | DH : High tensile dynamic | SH : High tensile static|
|EN 10270-1 : 2001||C (a)||Si||Mn (b)||P (max)||S (max)||Cu (max)|
|SL, SM, SH||0.35 – 1.00||0.10 – 0.30||0.50 – 1.20||0.035||0.035||0.2|
|DM, DH||0.45 – 1.00||0.10 – 0.30||0.50 – 1.20||0.02||0.025||0.12|
|(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.|
|HIGH CARBON STEEL CHEMICAL COMPOSITION|
|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 : 1991||C||Si (max)||Mn||P (max)||S (max)|
|NS, HS||0.35 – 0.85||0.35||0.40 – 1.00||0.05||0.05|
|ND, HD||0.45 – 0.85||0.35||0.30 – 1.00||0.03||0.03|
|M||0.60 – 1.00||0.35||0.25 – 0.75||0.03||0.03|
All data is provided for informational purposes only. In no event will Precision Metals EU and its partners, be liable with respect to 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 the information be used to assess suitability for a particular use or application. The information and data provided are deemed to be accurate to the best of our knowledge and may be revised anytime without notice, and assume no duty to update.