... API ,KR Approved 3.OD:30-457MM WT:2-80MM seamless steel pipe we have got three completer production line as ... Wall thickness can be max 100mm now.-,One new productionline for seamless Rectangular steel pipeCertificates: API ISO & KRMaterials: -,carbon steel pipe ... ,12Cr1MoV, 15CrMo, 37Mn5, 30CrMnSi, 27SiMn. -,for pipeline: API 5L GR.B, X42, X52, X60, X70. -,for construction: high thickness of ST44, ST52 ...