Standard:GB18248 -- Chinese National standard

Q/321088HGB3 -- Enterprise standard of Jiangsu Chengde Steel Pipe Co., LTD

ASTM A519 -- American Society for Materials and Testing Standard

SA372

USES:Used for manufacture of hot rolled large diameter seamless steel tubes for gas cylinders

Main production steel pipe grades:4130X, 4142, SA372J70, 4145, 4147