[DOC]mofcom.gov.cn
Web viewMain heat-treatment facilities include heat-treatment furnaces and plants, as well as equipment providing various refrigeration conditions. api 5l linepipe x52 x56 x60 seamless heat treatment seamless steel cold-rolled tubes in a diameter range Ø 0.23 159.0 mm and wall thickness 0.08-18.0 mm; api 5l linepipe x52 x56 x60 seamless heat treatment (API License No API5CT-1354). Incorporated in 2008, Quality Management System (QMS) for api 5l linepipe x52 x56 x60 seamless heat treatment
