The classification of pipe fitting bend

　　1. 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, etc.

　　Aluminum alloy 30036061, copper, copper, brass

　　2. It can be divided into pushing, pressing, forging, casting and so on.

　　3. Manufacturing standards can be divided into national standards, electrical standards, ship standards, chemical standards, water standards, American standards, German standards, Japanese standards, Russian standards, etc.

　　4. According to its curvature radius, it can be divided into long radius elbow and short radius elbow. Long radius elbow refers to the outer diameter of the pipe whose radius of curvature is equal to 1.5 times, that is, r = 1.5D; short radius elbow refers to the outer diameter of the pipe whose radius of curvature is equal to r = 1.0d. (D is the bend diameter, R is the radius of curvature).

　　5. According to the pressure rating, there are about 17 kinds, which are the same as the American pipe standards, including: sch5s, sch10s, sch10, sch20, sch30, sch40s, STD, sch40, sch60, sch80s, XS; sch80, schh100, sch120, sch140, sch160, XXS; the most commonly used ones are STD and XS.