ERW Steel Pipe standard: ASTM, DIN, ISO, EN, JIS, GB, etc. Material: Q195 Q215 Q235 Q345 Q355 S195T GR.B X42 X52X60 CC60 CC70 ST35 ST52 S235JR S355JR SGP STP G370 STP G410 GR12 GR2 etc. Outer diameter: 6mm-4064mm or as required Wall thickness: 3mm-50mm or as required Length: 3m-20m or as required Surface: Lightly oiled, hot dip galvanized, electro-galvanized, black, bare, varnish coating/anti-rust oil, protective coating, etc. Package: Standard export package, or as required. Price term: EXW, FOB, CIF, CFR, CNF, etc. Payment: T/T, L/C, Western Union, etc. Welded steel pipe refers to steel pipes with seams on the surface that are welded by steel strips or steel plates that are bent and deformed into round or square shapes. The blanks used for welded steel pipes are steel plates or strip steels. With the rapid development of high-quality strip continuous rolling production and the advancement of welding and inspection technology, the quality of welds continues to improve, and the variety and specifications of welded steel pipes are increasing, and seamless steel pipes are replaced in more and more fields. Welded steel pipes have lower cost and higher production efficiency than seamless steel pipes