1.Description 2.Tolerance on OD and WT 3.Size 4.Our Service 5.Package 6.Factory show 7.Projects 8.Quality Control 9.Related products 10.About us Permanent Steel Manufacturing Co.,Ltd has been committed to being a major supplier of quality kinds of carbon steel pipe, stainless steel tube, hollow section, numerous types of piping equipments including Bend, Cap, Coupling, Elbow, Reducer, Stub End, Tee, Olet, Joint, Gasket, etc. The Products from Permanent Steel Manufacturing Co.,Ltd are supplied in accordance with appropriate International Standards as well as Customer Specifications in a large variety of steel grades and dimensions. Permanent Steel Manufacturing Co.,Ltd on a 250,000 m2 area and has three production units: Foundry, Rolling and Extrusion mills. Permanent Steel Manufacturing Co.,Ltd operates under strict quality, environmental, as well as health and safety management systems, in compliance with ISO 9001, ISO 14001 and OHSAS 18001 standards.