ASTM A234 WP91 pipe fitting mean the pipe fitting which material is ASTM A234 WP91,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,WP91 is one of the steel grade in this standard.W means weldable,P means pressure,91 is grade 91.
Chemical Composition (%) of ASTM A234 WP91
| Grade | C | Mn | P | S | Si | Cr | Mo | Ni |
| WP91 | 0.08-0.12 | 0.3-0.6 | ≤0.02 | ≤0.01 | 0.2-0.5 | 8-9.5 | 0.85-1.05 | ≤0.4 |
Mechanical properties of ASTM A234 WP91
| Item | Tensile Strength KSI（MPa） | Yield Strength KSI（MPa) |
| WP91 | 85-110(585-760) | ≥60(415) |
Type of the ASTM A234 WP91 pipe fittings:
The regular products of A234 WP91 pipe fittings are elbows,tees,reducers,caps,cross etc.There are seamless and ERW A234 WP91 pipe fittings,the seamless A234 WP91 pipe fittings means the fittings are made from the seamless steel pipes,ERW means the fittings are made from ERW steel pipes.Welded A234 WP91 pipe fittings mean the large sizes fittings which are pieces welded from steel plates.(How to use the ASTM A234 WP91 pipe fitting?)
Manufacturing process of ASTM A234 WP91 pipe fittings:
The process of A234 WP91 pipe fittings manufacturing is called “wrought” which means it is casted or forged.Usually the ASTM A234 WP91 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.
Hebei Haihao Group has more than 30 years experiences in ASTM A234 WP91 steel pipe fittings manufacturing,we can supply all the range of the fittings of high quality and soon delivery.
