1. Reliable Raw Material: Vacuum - refining and continuous casting process 2. The computer-controlled heat-treatment furnaces Our annual capacity is 400,000 pieces. Some of them were exported to Southeast Asia, Europe, America and Oceania.Standard: AAR, UIC, BS, JIS, KS, or according to customers requirements. NameSpecificationStandard915KKD915*785*135TB/T2708-1996840HDSA840*7108135TB/T2817- ...