What are ASTM A234 WP22 pipe fittings?
ASTM A234 WP22 pipe fittings mean the pipe fittings which material is ASTM A234 WP22,they are used for the pressure piping systems of moderate and high temperature services.ASTM A234 is the standard of pipe fittings material,it indicates the materials properties of different kinds of carbon steel and alloy steel,WPB is one of the steel grade in this standard.W means weldable,P means pressure,22 is grade22.
Type of the ASTM A234 WP22 steel pipe fittings:
The regular products of A234 WP22 pipe fittings are elbows,tees,reducers,caps,cross etc.There are seamless and ERW A234 WP22 pipe fittings,the seamless A234 WP22 pipe fittings means the fittings are made from the seamless steel pipes,ERW means the fittings are made from ERW steel pipes.Welded A234 WP22 pipe fittings mean the large sizes fittings which are pieces welded from steel plates.
Manufacturing process of ASTM A234 WP22 steel pipe fittings:
The process of A234 WP22 pipe fittings manufacturing process is called “wrought” which means it is casted or forged.Usually the ASTM A234 WP22 elbows,tees,reducers are made from steel pipes,the caps are made from plates.But the large sizes pipe fittings are commonly manufactured in pieces and welded together.
Chemical Composition (%) of ASTM A234 WP22
| Grade | C | Mn | P | S | Si | Cr | Mo |
| WP22 Class1 | 0.05-0.15 | 0.3-0.6 | ≤0.04 | ≤0.04 | ≤0.5 | 1.9-2.6 | 0.87-1.13 |
| WP22 Class3 | _ | _ | _ | _ | _ | _ | _ |
Mechanical properties of ASTM A234 WP22
| Item | Tensile Strength KSI（MPa） | Yield Strength KSI（MPa) |
| WP22 Class1 | 60-85(415-585) | ≥30(205) |
| WP22 Class3 | 75-100(520-690) | ≥45(310) |
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