Material: GCr15 Standard: as per ASTM, DIN, JISG Size: OD:9mm~ ... rich in experices and advanced technic in producing seamless steel tube.Material: carbon steel series such as 1010, 1018, 1020, 1026, 1045 ... : 9-91mm, WT:1-12mm, L: 300-1200mm bearing steel tube