Pipe fitting is a general term for the parts that connect, control, change direction, divert flow, seal and support in the pipeline system. All steel pipe fittings are pressure bearing pipe fittings. According to the different processing technology, it is divided into four categories, that is, butt welded pipe fittings (there are two kinds of weld and no weld), socket welding and threaded pipe fittings, flange pipe fittings.
1. Divided by material: Carbon steel: ASTM/ASME A234 WPB, WPC alloy: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911, 15Mo3 15CrMoV, 35CrMoV Stainless steel :ASTM/ASME A403 WP 304-304L-304H-304LN-304N ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H Low Temperature steel :ASTM/ASME A402 WPL3-WPL 6 High Performance steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70 Cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon,PVC,PPR, RFPP(Reinforced polypropylene), etc.
2. According to the production method, it can be divided into push, pressing, forging, casting, etc. 3. According to manufacturing standards, it can be divided into national standard, electrical standard, ship standard, chemical standard, water standard, American standard, German standard, Japanese standard, Russian standard, etc. 4. According to its radius of curvature, it can be divided into long radius elbows and short radius elbows. Long radius elbow refers to the outside diameter of the pipe whose radius of curvature is equal to 1.5 times, that is, R=1.5D; Short radius elbow means that its radius of curvature is equal to the outside diameter of the pipe, that is, R=1.0D. (D is the diameter of the bend,R is the radius of curvature). 5. If it is divided according to the pressure level: there are about 17 kinds of pipes, which are the same as the pipe standards in the United States, including :Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, SCH100, Sch120, Sch140, Sch160, XXS; The two most commonly used are STD and XS.
