ASTM A234 WP22 Pipe Fittings refer to forged or formed steel fittings made from an alloy of wrought steel and available in seamless, welded, and fabricated types. They have been designed to withstand high temperatures and pressure levels and consist of essential components such as chromium, molybdenum, carbon, manganese, silicon, phosphorus, and sulfur. The two types of these fittings that are available are class 1 and class 3, and both of them have been designed to meet the requirement of having good mechanical properties. They have been fabricated as per the requirements of standards like ASME B16.9 and B16.28 and are available in many sizes and schedules. Metinox Overseas manufactures and exports A234 WP22 elbows, tees, reducers, caps, and bends from NPS ½” to 48”, each supplied with EN 10204 3.1 mill test certification and full heat traceability.
Request a Quote now!Table of Contents
- Specification of ASTM A234 WP22 Pipe Fittings
- Chemical Composition of ASTM A234 WP22 Pipe Fittings
- Mechanical Properties of ASTM A234 WP22 Pipe Fittings
- ASTM A234 WP22 Class 1 vs Class 3
- Types of ASTM A234 WP22 Pipe Fittings
- Pressure Rating Chart
- Weight Chart
- Tolerance Chart
- Dimension Chart
- Heat Treatment & Weldability
- Comparison Between WP22 vs WP91 vs WP11
- Applications Uses
- Related Products
- Frequently Asked Questions
Specification of ASTM A234 WP22 Pipe Fittings
| Property | Specification Details |
|---|---|
| Specification | ASTM A234 WP22 Pipe Fittings |
| Type | Butt Weld (BW), Seamless (SMLS), Welded |
| Thickness | Sch 5S, 20S, S10, S20, S30, 10S, S80, S100, S120, STD, 40S, S40, S60, XS, 80S, S140, S160, XXS and etc. |
| Type Of Dimension | BS1640, EN 10253 - 4, DIN 2605, JIS B2312, ANSI B16.9, MSS SP-75, ANSI B16.28, MSS-SP-43 Type A, MSS-SP-43 Type B, JIS B2313 |
| Standard | EN, ISO, DIN, JIS, NPT |
| Type | Elbow, Stub End, Bend, Tee, Reducer, Cap, Adapter, Wye, Cross |
| Connection Type | Threaded / Clamp End / End Bell / Weld / Flange |
| Pressure-Temperature Class | 150LB, 300LB, 600LB, 1500LB, 2500LB |
| Schedule | Schedule 5 to Schedule XXS |
| Size | Normal Pipe Size (NPS) 1/2 to Normal Pipe Size (NPS) 48" |
| Hardness | 197 HBW max |
| Heat Treatment | Annealed, Isothermal-Annealed, or Normalised & Tempered (per ASTM A234). |
Chemical Composition of ASTM A234 WP22 Pipe Fittings
| Grade | C | Mn | Si | S | P | Cr | Mo |
|---|---|---|---|---|---|---|---|
| A234 WP22 | 0.05-0.15 | 0.3-0.6 | ≤0.5 | ≤0.04 | ≤0.04 | 1.90-2.60 | 0.87-1.13 |
Mechanical Properties Of ASTM A234 WP22 Pipe Fittings
| Grade | Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation % |
|---|---|---|---|
| A234 WP22 | 415-585 | ≥205 | ≥20 |
ASTM A234 WP22 Class 1 vs Class 3: What’s the Difference?
| Attribute | WP22 Class 1 | WP22 Class 3 |
|---|---|---|
| Chemistry | 2.25Cr-1Mo (identical) | 2.25Cr-1Mo (identical) |
| Tensile strength | 415-585 MPa (60-85 ksi) | 515-690 MPa (75-100 ksi) |
| Yield strength (min) | 205 MPa (30 ksi) | 310 MPa (45 ksi) |
| Typical heat treatment | Full / isothermal anneal or N&T | Normalised & tempered |
| Common use | General high-temp piping | Higher-strength service |
Types of ASTM A234 WP22 Pipe Fittings
90° Elbow
45° Elbow
180° Elbow
Equal Tee
Reducing Tee
Concentric Reducer
Eccentric Reducer
Pipe Cap
Equal Cross
LR Elbow
SR Elbow
Stub End
Available product forms include ASTM A234 WP22 Alloy Steel Elbow, ASTM A234 WP22 Alloy Steel Tee, ASTM A234 WP22 Alloy Steel Reducer, ASTM A234 WP22 Alloy Steel End Cap, ASTM A234 WP22 Alloy Steel Stub End, ASTM A234 WP22 Alloy Steel Bend, ASTM A234 WP22 Alloy Steel Cross, and ASTM A234 WP22 Alloy Steel Reducing Tee.
Pressure Rating Chart of ASTM A234 WP22 Pipe Fittings
| Temperature (°F) | Temperature (°C) | Class 150 | Class 300 (1/4 - 1 inch) | Class 300 (1 1/4 - 2 inch) | Class 300 (2 1/2 - 3 inch) |
|---|---|---|---|---|---|
| -20 to 150 | -29 to 66 | 300 | 2000 | 1500 | 1000 |
| 200 | 93 | 265 | 1785 | 1350 | 910 |
| 250 | 121 | 225 | 1575 | 1200 | 825 |
| 300 | 149 | 185 | 1360 | 1050 | 735 |
| 350 | 177 | 150 | 1150 | 900 | 650 |
| 400 | 204 | - | 935 | 750 | 560 |
| 450 | 232 | - | 725 | 600 | 475 |
| 500 | 260 | - | 510 | 450 | 385 |
| 550 | 288 | - | 300 | 300 | 300 |
ASTM A234 WP22 Pipe Fittings Weight Chart
| DN | Sch 10S: 90° Elbow | Sch 10S: 45° Elbow | Sch 10S: Equal Tee | Sch 40S: 90° Elbow | Sch 40S: 45° Elbow | Sch 40S: Equal Tee | Sch 80S: 90° Elbow | Sch 80S: 45° Elbow | Sch 80S: Equal Tee |
|---|---|---|---|---|---|---|---|---|---|
| 8 | 0.02 | 0.01 | 0.03 | 0.03 | 0.02 | 0.06 | 0.04 | 0.03 | 0.07 |
| 10 | 0.03 | 0.02 | 0.05 | 0.03 | 0.02 | 0.03 | 0.06 | 0.04 | 0.09 |
| 15 | 0.06 | 0.03 | 0.09 | 0.08 | 0.04 | 0.10 | 0.10 | 0.05 | 0.14 |
| 20 | 0.07 | 0.03 | 0.13 | 0.08 | 0.04 | 0.17 | 0.11 | 0.05 | 0.20 |
| 25 | 0.14 | 0.08 | 0.28 | 0.15 | 0.11 | 0.29 | 0.22 | 0.14 | 0.38 |
| 32 | 0.23 | 0.11 | 0.49 | 0.26 | 0.17 | 0.59 | 0.40 | 0.23 | 0.68 |
| 40 | 0.30 | 0.17 | 0.68 | 0.40 | 0.23 | 0.86 | 0.51 | 0.29 | 1.02 |
| 50 | 0.50 | 0.25 | 0.85 | 0.70 | 0.4 | 1.28 | 0.91 | 0.59 | 1.59 |
| 65 | 0.85 | 0.48 | 1.41 | 1.40 | 0.77 | 2.19 | 1.81 | 0.99 | 3.13 |
| 80 | 1.25 | 0.63 | 1.77 | 2.20 | 1.08 | 3.31 | 2.97 | 1.50 | 4.45 |
| 90 | 1.70 | 0.75 | 2.67 | 2.83 | 1.42 | 4.08 | 4.00 | 2.00 | 5.44 |
| 100 | 2.10 | 1.08 | 3.46 | 4.47 | 2.09 | 5.27 | 6.18 | 2.81 | 7.71 |
| 150 | 5.45 | 2.72 | 8.07 | 10.89 | 5.44 | 10.99 | 16.32 | 8.16 | 13.61 |
| 200 | 10.20 | 5.33 | 15.65 | 21.54 | 10.77 | 20.91 | 33.11 | 16.56 | 28.12 |
| 250 | 18.15 | 9.75 | 26.46 | 38.56 | 19.27 | 35.38 | 51.71 | 25.86 | 49.90 |
| 300 | 25.80 | 13.62 | 39.46 | 59.42 | 29.71 | 62.14 | 79.38 | 39.69 | 83.91 |
ASTM A234 WP22 Pipe Fittings Tolerance Chart
| ASTM A234 WP22 Fittings (Normal Pipe Size) | O.D. at Bevel | I.D. at End | Wall Thick. T | 90 Degree & 45 Degree Elbows & Tees: Center-to-End Dimension A, C, B | Reducers & Lap Joint Stub End: Over-all Length H | Pipe Caps: Over-all Length F |
|---|---|---|---|---|---|---|
| 1/2 to 2-1/2 | +0.06 / -0.03 | Not less than 87.5% of nominal thickness | +/- 0.06 | +/- 0.06 | +/- 0.12 | |
| 3 to 3-1/2 | +/- 0.06 | +/- 0.06 | Not less than 87.5% of nominal thickness | +/- 0.06 | +/- 0.06 | +/- 0.12 |
| 4 | +/- 0.06 | +/- 0.06 | Not less than 87.5% of nominal thickness | +/- 0.06 | +/- 0.06 | +/- 0.12 |
| 5 to 8 | +/- 0.06 | +/- 0.06 | Not less than 87.5% of nominal thickness | +/- 0.06 | +/- 0.06 | +/- 0.25 |
| 10 to 18 | +0.16 / -0.12 | +/- 0.12 | Not less than 87.5% of nominal thickness | +/- 0.09 | +/- 0.09 | +/- 0.25 |
| 20 to 24 | +0.25 / -0.19 | +/- 0.19 | Not less than 87.5% of nominal thickness | +/- 0.09 | +/- 0.09 | +/- 0.25 |
| 26 to 30 | +0.25 / -0.19 | +/- 0.19 | Not less than 87.5% of nominal thickness | +/- 0.12 | +/- 0.19 | +/- 0.38 |
| 32 to 48 | +0.25 / -0.19 | +/- 0.19 | Not less than 87.5% of nominal thickness | +/- 0.19 | +/- 0.19 | +/- 0.38 |
Dimension Chart of ASTM A234 WP22 Pipe Fittings
| NPS (inch) | O.D. (millimeter) | O.D. (inch) | 90° Long Radius Elbow: Center to Face (inch) | 90° Short Radius: Center to Face (inch) | 45° Long Radius Elbow: Center to Face (inch) | 45° Long Radius Elbow: Radius (inch) | 180° Long Radius Return: Center to Center (inch) | 180° Long Radius Return: Back to Face (inch) |
|---|---|---|---|---|---|---|---|---|
| 1/2 | 21.3 | 0.840 | 1 1/2 | - | 5/8 | 2 | 1 7/8 | |
| 3/4 | 26.7 | 1.050 | 1 1/8 | - | 7/16 | 2 1/4 | 1 11/16 | |
| 1 | 33.4 | 1.315 | 1 1/2 | 1 | 7/8 | 3 | 2 3/16 | |
| 1 1/4 | 42.2 | 1.660 | 1 7/8 | 1 1/4 | 1 | 3 3/4 | 2 3/4 | |
| 1 1/2 | 48.3 | 1.900 | 2 1/4 | 1 1/2 | 1 1/8 | 3 | 4 1/2 | 3 1/4 |
| 2 | 60.3 | 2.375 | 3 | 2 | 1 3/8 | 4 | 6 | 4 3/16 |
| 2 1/2 | 73.0 | 2.875 | 3 3/4 | 2 1/2 | 1 3/4 | 5 | 7 1/2 | 5 3/16 |
| 3 | 88.9 | 3.500 | 4 1/2 | 3 | 2 | 6 | 9 | 6 1/4 |
| 3 1/2 | 101.6 | 4.000 | 5 1/4 | 3 1/2 | 2 1/4 | 7 | 10 1/2 | 7 1/4 |
| 4 | 114.3 | 4.500 | 6 | 4 | 2 1/2 | 8 | 12 | 8 1/4 |
| 5 | 141.3 | 5.563 | 7 1/2 | 5 | 3 1/8 | 10 | 15 | 10 5/16 |
| 6 | 168.3 | 6.625 | 9 | 6 | 3 3/4 | 12 | 18 | 12 5/16 |
| 8 | 219.1 | 8.625 | 12 | 8 | 5 | 12 | 24 | 16 5/16 |
| 10 | 273.1 | 10.750 | 15 | 10 | 6 1/4 | 15 | 30 | 20 3/8 |
| 12 | 323.9 | 12.750 | 18 | 12 | 7 1/2 | 18 | 36 | 24 3/8 |
Heat Treatment & Weldability ASTM A234 WP22 Pipe Fittings
WP22 fittings may be furnished as full annealed, isothermal annealed, or normalized and tempered. Normalized and tempered material shall have a tempering temperature of at least 1250°F (675°C). Hardness is limited to 197 HBW. Being an air-hardening alloy, WP22 needs preheat and PWHT for welds due to the 2.25Cr-1Mo composition. Fusion welded fittings will undergo PWHT at temperatures of no less than the tempering temperature of the material. Please match the filler metal and welding procedure with the project.
Comparison Between WP22 vs WP91 vs WP11
| Property | WP11 (1.25Cr-0.5Mo) | WP22 (2.25Cr-1Mo) | WP91 (9Cr-1Mo-V) |
|---|---|---|---|
| Chromium | 1.00-1.50% | 1.90-2.60% | 8.0-9.5% |
| Approx. max service temp | ~565°C | ~580°C | ~600°C+ |
| Creep / oxidation resistance | Moderate | High | Very high |
| Wall thickness vs WP22 | Thicker | Baseline | Up to ~50% thinner |
| Typical use | Lower-temp boiler/refinery | Boilers, superheaters, steam lines | Critical HP/HT steam & headers |
Applications Uses of ASTM A234 WP22 Pipe Fittings
- Oil & Gas Industry
- Petrochemical Industry
- Power Generation Industry
- Chemical Processing Industry
- Refineries
- Fertilizer Industry
- Steel & Metallurgical Industry
- Cement Industry
- Marine & Offshore Industry
- Pulp & Paper Industry
- Pharmaceutical Industry
- Water Treatment Industry
Frequently Asked Questions
ASTM A234 WP22 is a chromium-molybdenum alloy steel used for pipe fittings designed for high-temperature and high-pressure service.
ASTM A234 is a specification covering carbon and alloy steel pipe fittings for moderate to high temperature applications.
SA 234 WPC refers to carbon steel pipe fittings used in pressure vessels and boilers, typically suitable for moderate temperature service.
Yes, WP22 fittings are specifically designed for high-pressure and high-temperature environments.
Yes, WP22 fittings have good weldability and can be welded using proper procedures and heat treatment.
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