Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
5% Chromium – 0.5% Molybdenum alloy steel buttweld fittings for refinery heaters, cracking units and high-sulphur, high-temperature service.
Tubewell Steel & Engg. Co. manufactures, stocks and supplies ASTM A234 WP5 fittings from Mumbai – a 5Cr-½Mo ferritic alloy grade designed for hot hydrocarbon and high-sulphur service. WP5 elbows, tees, reducers and caps are the matching fittings for A335 P5 pipes in refinery furnaces and cracking units.
Why WP5 is specified for hot, sulphur-bearing hydrocarbon service
ASTM A234 WP5 is a wrought ferritic alloy steel fitting grade containing 4.0–6.0% chromium and 0.44–0.65% molybdenum. The high chromium content gives WP5 much better resistance to high-temperature sulphidation and oxidation than 1¼Cr or 2¼Cr grades, while molybdenum provides creep strength. This combination makes WP5 the standard choice for refinery heater outlets, crude and vacuum unit transfer lines and other hot oil service where sulphur compounds are present.
WP5 fittings are supplied in the annealed or normalized and tempered condition, in Class 1 or the higher-strength Class 3. We offer seamless and welded (WPW) elbows, tees, reducers, caps and stub ends to ASME B16.9 and B16.28, bevelled per ASME B16.25 and fully traceable to the heat. Each lot carries an EN 10204 3.1 certificate, with 3.2 certification and TPI available on request.
Standard supply range for ASTM A234 WP5 fittings
| Parameter | Details |
|---|---|
| Standard | ASTM A234, ASME SA234 |
| Grade | WP5 Class 1, WP5 Class 3 (UNS K41545); WPW5 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, NACE MR0175, TPI Reports |
International equivalents of A234 WP5
| Grade | ASTM / ASME | UNS | EN | W.Nr. | JIS | Matching Pipe / Forging |
|---|---|---|---|---|---|---|
| WP5 | A234 / SA234 WP5 | K41545 | X11CrMo5 | 1.7362 | STPA 25 | A335 P5 / A182 F5 |
Weight %, as per ASTM A234
| Grade | C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| A234 WP5 | 0.15 max | 0.30 – 0.60 | 0.040 max | 0.030 max | 0.50 max | 4.0 – 6.0 | 0.44 – 0.65 |
Values at room temperature as per ASTM A234
| Grade | Tensile Strength | Yield Strength (min) | Elongation (Long.) | Elongation (Trans.) | Hardness (max) |
|---|---|---|---|---|---|
| WP5 Cl.1 | 415 – 585 MPa (60 – 85 ksi) | 205 MPa (30 ksi) | 30% | 20% | 217 HB |
| WP5 Cl.3 | 485 – 655 MPa (70 – 95 ksi) | 275 MPa (40 ksi) | 22% | 14% | 217 HB |
Typical values (for reference)
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.70 g/cm³ | 0.278 lb/in³ |
| Melting Range | 1450 – 1510 °C | 2640 – 2750 °F |
| Modulus of Elasticity | 205 GPa | 29.7 × 10³ ksi |
| Thermal Conductivity (100°C) | 33 W/m·K | 19.1 BTU/h·ft·°F |
| Mean Thermal Expansion (20–300°C) | 11.9 µm/m·°C | 6.6 µin/in·°F |
| Specific Heat | 0.46 J/g·°C | 0.11 BTU/lb·°F |
| Max. Service Temperature | ≈ 650 °C | ≈ 1200 °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 WP5 fittings are used
Fired heater outlet and crossover piping in crude and vacuum units.
Delayed coker, visbreaker and thermal cracker transfer lines.
Hydrotreater and hydrocracker piping exposed to H₂ and H₂S.
High-temperature hydrocarbon lines with sulphur-bearing feedstock.
Inlet and outlet connections on high-temperature exchangers.
Furnace and reactor effluent piping in petrochemical complexes.
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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