The elbow is used in the pipe system to change the direction of the pipe fittings, according to the angle of the points can be divided into 45 °, 90 ° and 180, these three are the most common elbow. There are some other angles of the elbow, the angle can be based on the specific use of the environment to any transformation. Elbow material is usually cast iron, stainless steel, alloy steel, carbon steel, nonferrous metals, plastics and so on.
There are many types of elbows, and there are many ways to connect with the pipeline: direct welding, flange connection, hot melt connection, fused welding, threaded connection. Where direct welding is the most common way. If the elbow in accordance with the production process can be divided into: welding elbow, stamping elbow, pushing elbow, casting elbow, butt welding and so on.
According to the material of the elbow, the elbow can be divided into the following:
To material division
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 341-321H 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
Source: China Elbow Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)