... steel ---Materials: spring steel,carbon/alloystructural steel,auto steel, tool steel, --Standard:AISI,ASTM,JIP,GBT Special Steel --Carbon structural steels: The carbon steel (i.e. high quality carbon steel) ... steel may contains one or several kinds of alloy element i.e. Si, Mn, V. Ti, B. Ni. ... mineral machinery etc. As a notable grand in China, induction hardening bearing steel is applied to hub ...