... GB, ASTM, API 5L, API 5CT,DIN, JIS and so on Out Diameter6mm-519mm (1/4''-20'') ... ,27SiMn,12Cr1MoV,Q235, ST42,ST52,A106-a,A106-b, and so on Length 6-12m. As customers requirements. ... ''-20'')× 2mm-60mm Technique Seamless Usage 1. Low and middle pressure fluid transportation pipeline 2. Casing Tube 3 ... . Boiler Pipe 4. Petroleum and natural gas industry 5. Chemistry industry 6. Electric ...