... Stainless steel, Roller steel, Military steel, Heat-resistant steel and so on) and more than 100 steel grades. Some products like ... , SCM440, SCM435, SNCM439, D2, H13, SAE52100,SK3 and so on are not only used to chinese railway, coal mine, petroleum, shipbuilding ... . As the marketing department to face the final customers, we are keeping the strict service attitude all the time, following internal ...