1.)Chemical Composition: C:0.65-0.75;Si:0.17-0.37;Cr: ≤0.25;Mn:0.50-0.80;S:≤0.035;P:≤0.035;Ni: ≤0.25;Cu: ≤0.25

2.)performance is similar to 65 # steel, with higher flexibility and strength

3.)Functions:being applicable to the manufacturing of round or square spiral spring with not large cross-section, less demanding intensity on the general machines, such as flat springs and circular coil springs on cars, tractors and other machinery or trains to withstand vibration