Quality :Grade A Certificate:ISO9001:2000 Material: carbon stee ,stainless steel ,forged ... HG Material Carbon, Stainless, Alloy Certificate API, ISO9001: 2000, CCS Packing wooden cases or customerized Production Capacity 11000 ... , MATERIAL Carbon Steel Tubes/Pipes ST 37, ASTM A106 Gr B; A53, A210; API 5L X42, X46, X52 ... , X56, X60, X65, X70, X80 A106 Gr. B Steel Seamless Pipe / Carbon Steel Pipe