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,PED(Pressure Equipment Directive),API 5L, API 5CT, TS16949 ...