... steel, Alloy tool steel, Bearing steel, Stainless steel, Roller steel, Military steel, Heat-resistant steel and so on) and more than 100 ... S45C, SCM440, SCM435, SNCM439, D2, H13, SAE52100,SK3 and so on are not only used to chinese railway, coal mine, petroleum ... attention to contracts and asiding by the enterprise credit, insisting on offering good quality service and the mutual developement path. ...