Large diameter elbow is curved connecting pieces that join straight lengths of pipe, commonly at a 90° or 45° angle, allowing obstructions to be avoided in plumbing, ventilation, welding, and automotive applications.
ASME B16.9 Standard covers overall dimensions, tolerances,ratings, testing, and markings for factory-made wrought buttwelding fittings in sizes NPS 1⁄2 through NPS 48 (DN 15 through DN 1200).
Size range:
- 20 "-62" Inch
- Wall thickness: Sch5-Sch160 XXS
Material:
- Carbon steel: ASTM A234 WPB, WPC, ASTM A420 WPL1, WPL3, WPL6, WPHY42, 46, 52, 56, 60, 65, 70
- Alloy steel: ASTM A234 WP1, WP12, WP11, WP22, WP5, WP7, WP8, WP91 API5L X42 X52 X56 X60 X65 X70 X80
- Stainless steel: ASME A403 WP304, 304L, 316, 316L, 310
- Standards: ANSI, DIN, JIS, GB, ASTM, JB, SH, YB, SY, HG, API ASME
Usage:
Petroleum, chemical, power, gas, metallurgy.
Our pipe elbows are widely used in many industries, such as power generation, petroleum, natural gas, chemicals, shipbuilding, heating, papermaking, metallurgy and so on.
- W = WELDABLE / wrought
- P = RELATED TO P NUMBER OF ALLOY MATERIAL
- B = REFER TO MINIMUM YIELD OF MATERIAL
Chemical Composition (%) of ASTM A234 WP11
| Grade | C | Mn | P | S | Si | Cr | Mo | Ni | Cu | V | Nb |
| WP11 CL1 | 0.05-0.15 | 0.30-0.60 | 0.03 | 0.03 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | - | - | - | - |
| WP11 CL2/3 | 0.05-0.20 | 0.30-0.80 | 0.04 | 0.04 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | - | - | - | - |
Notes:
- For each reduction of 0.01% below the specified C maximum, an increase of 0.06% Mn above the specified maximum will be permitted, up to a maximum of 1.35%.
- The sum of Cu, Ni, Cr, and Mo shall not exceed 1.00%.
- The sum of Cr and Mo shall not exceed 0.32%.
- The maximum carbon equivalent (C.E.) shall be 0.50, based on heat analysis and the formula C.E.=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15.
Mechanical properties of ASTM A234
| Tensile Requirements | WPB | WP11CL1 | WP11CL3 |
| Tensile Strength, min, ksi[MPa] | 60-85 | 60-85 | 75-100 |
| (0.2% offset or 0.5% extension-under-load) | [415-585] | [415-585] | [520-690] |
| Yield Strength, min, ksi[MPa] | 32 | 30 | 45 |
| [240] | [205] | [310] |
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.
Reference Documents
- ASTM A216/A216M Specification for Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperature Service
- ASTM A217/A217M Specification for Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable for High-Temperature Service
- ASTM A960/A960M Specification for Common Requirements for Wrought Steel Piping Fittings
- ASME B16.9 Steel Butt-Welding Fittings
- ASME B16.11 Forged Steel Fittings, Socket Welding and Threaded