Products: api 5l grade b erw tube/pipe Size: 1/4"-24" Thickness: 2mm-60mm Certificate: ISO, ... API material:carbon api 5l grade b erw tube/pipeSpecificationsChina StandardSteel GradeStandardseamless steel tubesGB/T8162-199910, 20, 35, 45 ... -8610, 20, 12CrMo, 15CrMo, 1Cr2Mo, 1Cr5Mo, JIS G3441-1988for petroleum cracking