A234 WP91 Fittings

Hebei Haiwei manufacturer A234 WP91 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.

A234 WP91 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.

A234 WP91 Fittings Dimensions

A234 WP91 Fittings Weight

 

ASTM A234 WP91 Specification

Scope 

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.

Process

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.

A234 WP91 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
Copper	…	…	…
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.

A234 WP91 Fittings Mechanical Properties

	WPB	WPC, WP11-CL2	WP11-CL1, WP22-CL1 WP5-CL1 WP9-CL1	WP11-CL3, WP22-CL3 WP5-CL3 WP9-CL3	WP91
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)

Elongation

	WPB, WPC, WP11, WP22		WP91
	Longitundinal	Transverse	Longitundinal	Transverse
Standard 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)	B	B

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