ASTM A234 WP91 Alloy Buttweld Fittings
- Wilson Pipeline
- Dec 15, 2021
- 1 min read
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 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.
ASTM A234 WP91 Pipe Fittings Chemical Requirements
Composition, %WPB B,C,D,E,WPC C,D,E,WP11 CL1WP11 CL2,WP11 CL3WP22 CL1,WP22 CL3WP5 CL1,WP5 CL3Carbon0.30.350.05–0.150.05–0.200.05–0.200.05–0.150.05–0.150.150.15Manganese0.29–1.060.29–1.060.30–0.600.30–0.800.30–0.800.30–0.600.30–0.600.30–0.600.30–0.60Phosporus0.050.050.030.040.040.040.040.040.04Sulfur0.0580.0580.030.040.040.040.040.030.03Silicon0.10 min0.10 min0.50–1.000.50–1.000.50–1.000.50.50.50.5Chromium0.40.41.00–1.501.00–1.501.00–1.501.90–2.601.90–2.604.0–6.04.0–6.0Molybdenum0.15 max0.15 max0.44–0.650.44–0.650.44–0.650.87–1.130.87–1.130.44–0.650.44–0.65Nickel0.40.4…………………Copper0.40.4…………………OthersVanadium 0.08Vanadium 0.08…………………WP9 CL1,WP9 CL3WP91Carbon0.150.150.08–0.12Manganese0.30–0.600.30–0.600.30–0.60Phosporus0.030.030.02Sulfur0.030.030.01Silicon110.20–0.50Chromium8.0–10.08.0–10.08.0–9.5Molybdenum0.90–1.100.90–1.100.85–1.05Nickel……0.4Copper………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
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