Hot-rolled silicon-manganese spring steel 60Si7 to IS 3195:1992 (third revision) as amended (Amendments 1 and 2), supplied as flats and rounds for volute and helical springs for railway rolling stock; the springs are worked hot and heat-treated. Maximum hardness in the annealed condition is 245 HB; the untreated hardness is about 255 HB for guidance.
Applications
Used in leaf springs, coil springs, suspension parts, agricultural tines, clips, and spring washers.