Specifications 1. seamless steel pipe 2.Certificate:ISO9001:2008, API ,KR Approved 3.OD:30- ... 100mm now.-,One new productionline for seamless Rectangular steel pipeCertificates:API ISO & KRMaterials:-,carbon steel pipe for liquid: ASTM A106/A53 GR.B, ST37 ... , ST44.-,alloy pipe: P110, A335-P12, A335-P11,12Cr1MoV, 15CrMo ...