What is ASTM A234 WP91 steel pipe fitting?

ASTM A234 WP91 steel 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 steel pipe fitting:

The regular products of A234 WP91 steel 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.

Manufacturing process of ASTM A234 WP91 steel pipe fitting:

The process of A234 WP91 steel 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,our plant acquired world class approved certificates like the API,ISO9001,ISO14001,CE/PED,ABS and we keep the cooperation with many professional third perty inspection agencies,such as the SGS,BV,LR,ABS,VELOSI etc.