Detailed introduction of pipe fitting bend classification

　　1. Pipe fitting bend is divided according to 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 leaching, PVC, PPR, rfpp (reinforced polypropylene), etc.

　　Aluminum alloy 3003，6061, copper, red copper, brass

　　2. According to the manufacturing method, pipe fitting bend can be divided into pushing, pressing, forging and casting.

　　3. According to the manufacturing standards, pipe fitting bend can be divided into national standard, electrical standard, ship standard, chemical standard, water standard, American Standard, German standard, Japanese standard, Russian standard, etc.

　　4. Pipe fitting bend can be divided into long radius pipe fitting bend and short radius pipe fitting bend according to its curvature radius. Long radius pipe fitting bend means that its radius of curvature is equal to 1.5 times the outer diameter of the pipe, i.e. r = 1.5D; short radius pipe fitting bend means that its radius of curvature is equal to the outer diameter of the pipe, i.e. r = 1.0d. (D is the diameter of elbow, R is the radius of curvature).

　　5. According to the pressure rating, there are about 17 kinds of pipe fitting bends, which are the same as the American pipe standards, including: sch5s, sch10s, sch10, sch20, sch30, sch40s, STD, sch40, sch60, sch80s, XS; sch80, sch100, sch120, sch140, sch160, XXS; the most commonly used are STD and XS.