1. seamless steel pipe 2.Certificate:ISO9001:2008, API ,KR Approved 3.OD:30-457MM WT:2-80MM seamless ... 100mm now.-,One new productionline for seamless Rectangular steel pipeCertificates: API ISO & KRMaterials: -,carbon steel pipe for liquid: ASTM A106/A53 GR ... -P12, A335-P11,12Cr1MoV, 15CrMo, 37Mn5, 30CrMnSi, 27SiMn. -,for pipeline: API 5L GR.B, X42, X52, X60, X70. -,for construction: high ...