... 100mm now.-,One new productionline for seamless Rectangular steel pipeCertificates:API ISO & KRMaterials:-,carbon steel pipe for liquid: ASTM A106/A53 ... , 15CrMo, 37Mn5, 30CrMnSi, 27SiMn.-,for pipeline: API 5L GR.B, X42, X52, X60, X70.-,for construction: high thickness of ST44, ... ST52.-,for mechanical process: C45, SAE1045. ...