Alloy Steel Elbow

Alloy elbows are made of various materials, including bronze, stainless steel, manganese steel, high manganese steel, nickel steel and martensitic alloys. For example, ordinary bronze alloy elbows are more common in general tap water pipes, while stainless steel elbows are used in many tap water pipes with the improvement of living standards. Manganese steel alloy elbows are suitable for pipes with severe wear and consumption, such as concrete conveying pipes and mud conveying pipes. High manganese steel alloy elbows are used in pipes with intense fluid flow and strong impact. Nickel steel alloy elbows are usually used in normal temperature conveying pipes with high concentration of oxidizing acids (such as nitric acid and sulfuric acid), while martensitic alloy elbows have high high temperature strength, oxidation resistance and water vapor corrosion resistance below 650℃, and are often used in high temperature water vapor conveying pipes and water gas pipes.

The implementation standards of alloy elbows include GB/T12459-2005, GB/T13401, GB/T10752-1999, etc. These standards specify the requirements for the size, material, performance, etc. of the elbows.

According to the pressure level classification, there are about seventeen pressure levels for welded elbows, including Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS, Sch80, Sch100, Sch120, Sch140, Sch160, XXS, of which STD and XS are the most commonly used.

According to the curvature radius classification, welded elbows can be divided into long radius elbows and short radius elbows. Long radius elbows refer to elbows with a radius of curvature equal to 1.5 times the outer diameter of the pipe (R=1.5D), while short radius elbows have a radius of curvature equal to the outer diameter of the pipe (R=D). The most commonly used elbow is 1.5D. If the contract does not specify whether it is 1D or 1.5D, then the 1.5D elbow should be optimized.