our professional biz products 1.seamless steel pipe: carbon steel, alloyed steel and stainless steel, OD 6mm to 720mm, carry our ASTM, API 5L, API 5CT standard. 2.welded steel pipe: round pipe, Sq pipe 3. pipes fittings: flange, elbow, tee, ends cap 4.steel plate and coil. 5. shape steel 6. process as sample and requirements