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  • ASTM A234 WP91 Buttweld Fittings

Name:ASTM A234 WP91 Buttweld Fittings
Specificaiton:ASTM A234
Size:1/2" to 120"
Rating:SCH10 To SCHXXS
Steel Grade:A234 WP5, WP9, WP11, WP22, WP91, WP92
Packing:In plywood cases or pallets
End:Plain ends or bevelled ends
Delivery term:FOB, CIF, CNF, EXW
Payment term:TT or L/C at sight
Loading Port:XINGANG
Deliver mode:By sea, By air, By land

Product Description

ASTM A234 Alloy Steel WP91 Buttweld Fittings

Hebei Zhongji Is A Leading Supplier For Your ASTM A234 WP91 Alloy Steel Buttweld Pipe Fittings.

Hebei Zhongji manufacturer A234 WP91 buttweld fittings made from high quality alloy steel to ASTM A234 which can be used in various piping systems. The advantages of butt weld include: 

• Welding a fitting to the pipe means that it is permanently leak proof.

• The continuous metal structure formed between the pipe and fitting adds strength to the system.

• Smoother inner surface and gradual direction changed reduce the pressure losses and turbulence and minimises the action of corrosion and abrasion.

• A welded system utilises minimal space.

ASTM A234 WP91 Buttweld Pipe Fittings Types

Elbows, Long Radius Elbow, Short Radius Elbow, Bend, Long Radius Bends, Piggable Bends, Tee, Equal Tee, Reducing Tee, Cross, Reducer, Concentric Reducer, Eccentric Reducer, Pipe End Caps.

ASTM A234 WP91 Buttweld Pipe Fittings Dimensions

ASTM A234 WP91 Pipe Buttweld Fittings Weight

ASTM A234 WP91 Specification


ASTM A234 covers wrought carbon steel and alloy steel fittings of seamless and welded construction covered by the latest revision of ASME B16.9, B16.11, MSS-SP-79, MSS-SP-83, MSS-SP-95, and MSS-SP-97. These fittings are for use in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures.


Killed steel, with forgings, bars, plates, sheet, and seamless or fusion-welded tubular products with filler metal added. Forging or shaping operations performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, fusion welding, machining, or by a combination of two or more of these operations.

Heat Treatment

After forming at an elevated temperature, fittings are cooled to a temperature below the critical range under suitable conditions to prevent injurious defects caused by too rapid cooling, but in no case more rapidly than the cooling rate in still air. Heat treatment temperatures specified are metal (part) temperatures. Heat-treated fittings are to be treated according to paragraph 7 in Specification A960/A960M.

ASTM A234 WP91 Pipe Fittings Chemical Requirements

Composition, %

WPB B,C,D,E, WPC C,D,E, WP11 CL1 WP11 CL2, WP11 CL3 WP22 CL1, WP22 CL3 WP5 CL1, WP5 CL3
Carbon 0.3 0.35 0.05–0.15 0.05–0.20 0.05–0.20 0.05–0.15 0.05–0.15 0.15 0.15
Manganese 0.29–1.06 0.29–1.06 0.30–0.60 0.30–0.80 0.30–0.80 0.30–0.60 0.30–0.60 0.30–0.60 0.30–0.60
Phosporus 0.05 0.05 0.03 0.04 0.04 0.04 0.04 0.04 0.04
Sulfur 0.058 0.058 0.03 0.04 0.04 0.04 0.04 0.03 0.03
Silicon 0.10 min 0.10 min 0.50–1.00 0.50–1.00 0.50–1.00 0.5 0.5 0.5 0.5
Chromium 0.4 0.4 1.00–1.50 1.00–1.50 1.00–1.50 1.90–2.60 1.90–2.60 4.0–6.0 4.0–6.0
Molybdenum 0.15 max 0.15 max 0.44–0.65 0.44–0.65 0.44–0.65 0.87–1.13 0.87–1.13 0.44–0.65 0.44–0.65
Nickel 0.4 0.4
Copper 0.4 0.4
Others Vanadium 0.08 Vanadium 0.08
WP9 CL1, WP9 CL3 WP91
Carbon 0.15 0.15 0.08–0.12
Manganese 0.30–0.60 0.30–0.60 0.30–0.60
Phosporus 0.03 0.03 0.02
Sulfur 0.03 0.03 0.01
Silicon 1 1 0.20–0.50
Chromium 8.0–10.0 8.0–10.0 8.0–9.5
Molybdenum 0.90–1.10 0.90–1.10 0.85–1.05
Nickel 0.4
Others Vanadium 0.18–0.25
Columbium 0.06-0.10
Nitrogen 0.03-0.07
Aluminum 0.02F
Titanium 0.01F
Zirconium 0.01F

B Fittings made from bar or plate may have 0.35 max carbon.A When fittings are of welded construction, the grade and marking symbol shown above shall be supplemented by letter “W”.

C Fittings made from forgings may have 0.35 max carbon and 0.35 max silicon with no minimum.

D For each reduction of 0.01 % below the specified carbon maximum, an increase of 0.06 % manganese above the specified maximum will be permitted, up to a maximum of 1.65 %.

E The sum of Copper, Nickel, Chromium, and Molybdenum shall not exceed 1.00 %.

F Applies both to heat and product analyses.

ASTM A234 WP91 Pipe Fittings Mechanical Properties

Tensile strength, minimum unless a range is given ksi (MPa) 60 (415) 70 (485) 60 (415) 75 (520) 90 (620)
Yield,strength, min ksi (MPa) (0.2% offset or 0.5% extension under-load) 35 (240) 40 (275) 30 (205) 45 (310) 60 (415)


WPC, WP11, WP22
Longitundinal Transverse Longitundinal Transverse
round specimen, or small proportioanl specimen, min % in 4 D
22 14 20 13
Rectangular speicmen for wall thickness 5/16″ and over, and
for all small sizes tested in full section; min % in 2 in.
30 20 A
Rectangular speicimen for wall thickness less than 5/16″;
min % in 2 in (1/2″ wide specimen)

A WPB and WPC fittings manufactured from plate shall have a minimum elongation of 17 %.

B For each 1⁄32 in. [0.79 mm] decrease in wall thickness below 5⁄16 in. [7.94 mm], a deduction of 1.5 % for longitudinal and 1.0 % for transverse from the values shown above is permitted.

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