Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
2.25% Chromium – 1% Molybdenum alloy steel buttweld fittings with high creep strength for main steam, hot reheat and hydroprocessing service.
Tubewell Steel & Engg. Co. manufactures, stocks and supplies ASTM A234 WP22 fittings from Mumbai, India. With 2.25% chromium and 1% molybdenum, WP22 offers higher creep-rupture strength than WP11 and is the matching fitting grade for A335 P22 pipe in power, refinery and hydrogen service.
Higher creep strength for main steam and hydrogen service
ASTM A234 WP22 is a wrought ferritic alloy steel fitting grade with 1.90–2.60% chromium and 0.87–1.13% molybdenum. Doubling the molybdenum content compared with WP11 gives WP22 noticeably better creep and stress-rupture strength, while the higher chromium improves resistance to oxidation and high-temperature hydrogen attack. WP22 is therefore widely specified for main steam and hot reheat lines in thermal power plants and for hydrotreater and hydrocracker piping in refineries.
WP22 is offered in Class 1 (415 MPa min tensile) and Class 3 (485 MPa min tensile). We supply seamless and welded (WPW22) elbows, tees, reducers, caps and stub ends to ASME B16.9 / B16.28, annealed or normalized and tempered, bevelled to ASME B16.25 and marked per MSS SP-25. Every lot ships with EN 10204 3.1 certificates, with IBR documentation and third-party inspection available on request.
Standard supply range for ASTM A234 WP22 fittings
| Parameter | Details |
|---|---|
| Standard | ASTM A234, ASME SA234 |
| Grade | WP22 Class 1, WP22 Class 3 (UNS K21590); WPW22 for welded |
| Dimension Standard | ASME B16.9, ASME B16.28, MSS SP-43 |
| Size (NB) | Seamless: 1/2" NB to 24" NB; Welded: 2" NB to 48" NB |
| Wall Thickness | SCH 10, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS |
| Elbows | 45°, 90° and 180° – Long Radius (1.5D) and Short Radius (1D) |
| Bending Radius | R = 1D, 1.5D, 2D, 3D, 5D and custom pipe bends |
| Tees & Crosses | Equal Tee, Reducing Tee, Equal Cross, Reducing Cross |
| Reducers | Concentric Reducer, Eccentric Reducer |
| Other Types | Pipe Cap, Stub End (Long / Short pattern), Return Bend |
| Manufacturing | Seamless (WP) and Welded (WPW) – hot formed / cold formed |
| Heat Treatment | Full / Isothermal Annealed or Normalized & Tempered |
| Ends | Bevelled Ends as per ASME B16.25 |
| Certificates | EN 10204 3.1 / 3.2, IBR, NACE MR0175, TPI Reports |
International equivalents of A234 WP22
| Grade | ASTM / ASME | UNS | EN | W.Nr. | JIS | Matching Pipe / Forging |
|---|---|---|---|---|---|---|
| WP22 | A234 / SA234 WP22 | K21590 | 10CrMo9-10 | 1.7380 | STPA 24 | A335 P22 / A182 F22 |
Weight %, as per ASTM A234
| Grade | C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| WP22 Cl.1 / Cl.3 | 0.05 – 0.15 | 0.30 – 0.60 | 0.040 max | 0.040 max | 0.50 max | 1.90 – 2.60 | 0.87 – 1.13 |
Values at room temperature as per ASTM A234
| Grade | Tensile Strength | Yield Strength (min) | Elongation (Long.) | Elongation (Trans.) | Hardness (max) |
|---|---|---|---|---|---|
| WP22 Cl.1 | 415 – 585 MPa (60 – 85 ksi) | 205 MPa (30 ksi) | 30% | 20% | 197 HB |
| WP22 Cl.3 | 485 – 655 MPa (70 – 95 ksi) | 275 MPa (40 ksi) | 22% | 14% | 197 HB |
Typical values (for reference)
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.80 g/cm³ | 0.282 lb/in³ |
| Melting Range | 1450 – 1510 °C | 2640 – 2750 °F |
| Modulus of Elasticity | 205 GPa | 29.7 × 10³ ksi |
| Thermal Conductivity (100°C) | 36 W/m·K | 20.8 BTU/h·ft·°F |
| Mean Thermal Expansion (20–300°C) | 12.6 µm/m·°C | 7.0 µin/in·°F |
| Specific Heat | 0.46 J/g·°C | 0.11 BTU/lb·°F |
| Max. Service Temperature | ≈ 600 °C | ≈ 1110 °F |
As per ASME B16.9 – center-to-end / end-to-end dimensions in mm
| NPS | OD at Bevel | 90° LR Elbow (A) | 45° LR Elbow (B) | Tee (C / M) | 180° LR Return (O) | Cap (E) | Reducer (H) |
|---|---|---|---|---|---|---|---|
| 1/2" | 21.3 | 38 | 16 | 25 | 76 | 25 | – |
| 3/4" | 26.7 | 38 | 19 | 29 | 76 | 25 | 38 |
| 1" | 33.4 | 38 | 22 | 38 | 76 | 38 | 51 |
| 1 1/4" | 42.2 | 48 | 25 | 48 | 95 | 38 | 51 |
| 1 1/2" | 48.3 | 57 | 29 | 57 | 114 | 38 | 64 |
| 2" | 60.3 | 76 | 35 | 64 | 152 | 38 | 76 |
| 2 1/2" | 73.0 | 95 | 44 | 76 | 190 | 38 | 89 |
| 3" | 88.9 | 114 | 51 | 86 | 229 | 51 | 89 |
| 4" | 114.3 | 152 | 64 | 105 | 305 | 64 | 102 |
| 5" | 141.3 | 190 | 79 | 124 | 381 | 76 | 127 |
| 6" | 168.3 | 229 | 95 | 143 | 457 | 89 | 140 |
| 8" | 219.1 | 305 | 127 | 178 | 610 | 102 | 152 |
| 10" | 273.1 | 381 | 159 | 216 | 762 | 127 | 178 |
| 12" | 323.9 | 457 | 190 | 254 | 914 | 152 | 203 |
| 14" | 355.6 | 533 | 222 | 279 | 1067 | 165 | 330 |
| 16" | 406.4 | 610 | 254 | 305 | 1219 | 178 | 356 |
| 18" | 457.0 | 686 | 286 | 343 | 1372 | 203 | 381 |
| 20" | 508.0 | 762 | 318 | 381 | 1524 | 229 | 508 |
| 22" | 559.0 | 838 | 343 | 419 | – | 254 | 508 |
| 24" | 610.0 | 914 | 381 | 432 | 1829 | 267 | 508 |
All dimensions in mm. A, B, C/M = center-to-end; O = center-to-center; E = cap length (for standard wall); H = reducer end-to-end. Wall thickness is matched to the specified pipe schedule.
Where ASTM A234 WP22 fittings are used
Main steam and hot reheat piping in subcritical power stations.
Hydrotreater and hydrocracker reactor piping in hydrogen service.
Reformer, heater outlet and high-pressure process lines.
Superheater headers and high-pressure HRSG piping.
Ammonia synthesis loops and hot hydrogen lines.
Cracker and reactor effluent piping at elevated temperature.
Quality you can verify on every heat
Large inventory for fast dispatch
MTC EN 10204 3.1 / 3.2
Positive material identification
Pan-India & export shipping
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