Carbon steel pipe fitting is one of the most widely used pipe fitting products. The main material is Q235,20#,35#,45#, 16Mn. The main products include carbon steel elbow, carbon steel flange, carbon steel tee, carbon steel reducing pipe (size head), carbon steel head (cap) and so on. The main implementation standards include national standard, American standard, Japanese standard, which also includes the Ministry of Chemical industry standards, Sinopec pipe fitting standards, power pipe fitting standards.