... -60mm Certificate: ISO, API material:carbon api 5l grade b erw tube/pipeSpecificationsChina StandardSteel GradeStandardseamless steel tubesGB/T8162-199910, 20, 35, 45 ... , 20G, Q345, Q390, 10MoVNb, 12CrMo, 15CrMo, 12Cr2MoISO 9329-2-1997 for high pressure --Chemical fertilizer equipmentASTM A161-94Seamless steel tubesGB9948-8610 ...