Name: spring steel Model: 1770 Origin: Sweden Chemical composition: C: 0.65 ~ 0.80 Si: 0.15 ~ 0.40 Mn: 0.50 ~ 0.80 P ≤ 0.035 S ≤ 0.035 Cr ≤ - Cu ≤ - N-spring steel Other - 1770 contains a variety of : bar, wire states: quenching and tempering, 2.0 ~ 2.5mm Tensile strength σb (MPa): 600 Yield strength σs (MPa): 350 Elongation δ10 (%): - role: is due back in the quenched and the elastic fire condition, and specifically for the manufacture of springs and elastic components of steel.