Spring Steels for Use under Elevated Temperature (IS : 4454-1967)
 
Grades Tensile strength (for wire dia upto 7 mm) Min C % Si % Cr % Va % Applications
1 S 150 0.45-0.55 0.15-0.35 0.90-1.20 0.15-0.30

Cold formed helical springs, volute springs, etc.
1 D 145 0.45-0.55 0.15-0.35 0.90-1.20 0.15-0.30
2 S 175 0.50-0.60 1.20-1.60 0.50-0.80 -
2 D 175 0.50-0.60 1.20-1.60 0.50-0.80 -
S = Static stressed springs, D = Dynamic stressed springs