... ---Materials: spring steel,carbon/alloystructural steel,auto steel, tool steel, --Standard:AISI,ASTM,JIP,GBT Special Steel --Carbon ... on automobile, tractor, vessel, steam turbine, heavy load machine tool, etc. -- Bear steels High carbon and chromium bearing ... sleeve on driving shaft of combustion engine, electric vehicle, machine tool, tractor, steel rolling equipment, explorer, railway vehicle and ...