Material classification of pipe fittings

1. Pipe Fittings Classified by Material

Carbon Steel: ASTM/ASME A234 WPB, WPC
Alloy Steel: ASTM/ASME A234 WP1, WP11, WP12, WP22, WP5, WP91, WP911; and 15Mo3, 15CrMoV, 35CrMoV, etc.
Stainless Steel: ASTM/ASME A403 WP304/304L/304H/304LN/304N, WP316/316L/316H/316LN/316N/316Ti, WP321/321H, WP347/347H

Low Temperature Steel: ASTM/ASME A420 WPL3, WPL6
High Strength Pipeline Steel: ASTM/ASME A860 WPHY 42/46/52/60/65/70 (Mainly used for long-distance pipelines)
Other materials: Cast steel (e.g., ASTM A216 WCB), copper and copper alloys, aluminum alloys, plastics (e.g., PVC, PPR, RFPP), etc.

2. Classification by production method

Push-formed (commonly used for elbows), molded, forged, cast, etc.

3. Classification by manufacturing standard

National standard (GB), Petrochemical standard (SH), Chemical standard (HG), Power standard (DL), American standard (ASTM/ASME), German standard (DIN), Japanese standard (JIS), etc.

4. Classification by radius of curvature

Long radius elbow: Radius of curvature equals 1.5 times the outer diameter of the pipe, i.e., R=1.5D. 

Short radius elbow: Radius of curvature equals the outer diameter of the pipe, i.e., R=1.0D.

(D is the elbow diameter, R is the radius of curvature)

5. Classification by wall thickness grade

Commonly used wall thickness grades include: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS, Sch80, Sch100, Sch120, Sch140, Sch160, XXS, etc. Among them, STD and XS are the most commonly used.

Read more: Pipe Elbow Dimensions & Sizes– Long & Short Radius Elbow Dimensions in mm