Carbon-coil

High Carbon Steel

Music Wire, Hard Drawn, Oil Tempered, Carbon Valve

High carbon steel spring wire is one of the most widely used materials for the production of mechanical springs due to its high tensile strength, excellent elasticity, and cost-effectiveness.

Manufactured from steels with elevated carbon content, this wire can be heat-treated and cold-drawn to achieve the strength and resilience required for demanding spring applications.

High carbon steel spring wire is commonly used in compression, extension, and torsion springs found in automotive components, agricultural machinery, industrial equipment, consumer products, and general engineering applications.

Grades such as music wire and hard-drawn spring wire offer excellent fatigue resistance and the ability to withstand repeated loading cycles while maintaining spring performance.

Although it does not provide the corrosion resistance of stainless steel or specialty alloys, high carbon steel spring wire remains a preferred choice for many applications where strength, durability, and economical production are the primary requirements.

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Material Music Wire Hard Drawn High Tensile Hard Drawn Oil Tempered Carbon Valve
ASTM A 228 A 277 A 679 A 229 A 230
Nominal Analysis C -- .70 - 1.00% C -- .45 - .85% C -- .65 - 1.00% C -- .55 - .85% C -- .60 - .75%
Mn -- .20 - 60% Mn -- .60 - 1.30% Mn -- .20 - 1.30% Mn -- .60 - 1.20% Mn -- .60 - .90%
Minimum Tensile Strength 230-399 CLI 147-283 238-350 CLI 165-293 215-240
CLII 171-324 CLII 191-324
Modulus of Elasticity E 30 30 30 30 30
psi x 103
Design Stress % Minimum 45 40 45 45 45
Tensile
Modulus in Torsion 11.5 11.5 11.5 11.5 11.5
G psi x 106
Maximum Temp. °F 250 250 250 250 250
Maximum Temp. °C 121 121 121 121 121
Rockwell Hardness C41-60 C31-52 C41-60 C42-55 C45-49
Method of Manufacture Cold drawn. High and uniform tensile. Precision springs and wire forms. Cold drawn. Average stress applications. Lower cost springs and wire forms. Cold drawn. Higher quality springs and wire forms. Cold drawn and heat treated before fabrication, General purpose spring wire. Cold drawn and heat treated before fabrication. Suitable for cyclic applications.

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