... 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 ... API 5L GR.B, X42, X52, X60, X70.-,for construction: high thickness of ST44, ST52.-,for mechanical process: C45, SAE1045.We ...