DIN1629,ST37.0,ST44.0,Seamless steel pipe Certificate:ISO9001:2000,PED,API 5L, API 5CT, TS16949 ... ,KR O.D:1/2"-4" W.T.:2-14mm DIN1629,ST37 ... .0,ST44.0,Seamless steel pipe 1) Cold drawn seamless steel tube/pipe2) Certificate:ISO9001:2000, ... Equipment Directive),API 5L, API 5CT, TS16949,Mill Test Certificate EN10204/3.1B3) O.D: 1/2"-4"( ...