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Chemical Composition (in weight %)

C Si Mn Cr Mo Ni V W Others
0.54 0.28 0.90 1.05 0.20 - 0.20 - -

Structural Cr-Mo-V-steel.

Severely stressed springs for automobile industry - machine and engine parts, torsion springs, threaded springs, bark removing knives. 

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210 
Density [g/cm3]: 7.78

oft Annealing
Heat to 640-680oC, cool slowly. This will produce a maximum Brinell hardness of 255.

Temperature: 850-880oC.

Harden from a temperature of 830-860oC followed by oil quenching.

Tempering temperature: 350-550oC.

Mechanical Properties in Hardening and Tempering Condition at Ambient Temperature

0.2 % proof stress (N/mm2) Tensile strength (N/mm2) Elongation (%)
1180 1370-1670 6