Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
ASTM A234 chrome-moly 45°, 90° and 180° buttweld elbows in long and short radius for high-temperature steam, boiler and refinery piping.
Tubewell Steel & Engg. Co. manufactures, stocks and supplies alloy steel elbows from Mumbai, India in ASTM A234 WP5, WP9, WP11, WP22 and WP91. Our 45°, 90° and 180° long radius and short radius elbows change pipeline direction smoothly while matching the creep strength and corrosion resistance of the connected A335 pipe.
Direction-changing fittings for high-temperature alloy piping
Alloy steel buttweld elbows are wrought fittings that change the direction of flow by 45°, 90° or 180° in chrome-moly piping systems. Long radius (LR) elbows have a centerline radius of 1.5 times the nominal pipe size and are preferred for lower pressure drop, smoother flow and reduced erosion, while short radius (SR) elbows with a 1D radius are used where space is limited. 180° return bends are commonly used in heater coils and heat exchanger circuits.
Our elbows are hot formed from seamless A335 pipe on mandrel or by hot-press methods, then heat treated as required by ASTM A234 for the selected grade – annealed or normalized and tempered for WP5 to WP22, and normalized and tempered for WP91. Each elbow is checked for wall thickness at the extrados and intrados, ovality and center-to-end dimensions per ASME B16.9, bevelled per ASME B16.25 and supplied with EN 10204 3.1 certificates.
Standard supply range for alloy steel buttweld elbows
| Parameter | Details |
|---|---|
| Standard | ASTM A234, ASME SA234 |
| Grades | WP5, WP9, WP11 (Cl.1/2/3), WP22 (Cl.1/3), WP91 |
| Dimension Standard | ASME B16.9 (LR & SR), 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 |
| Elbow Angles | 45° Elbow, 90° Elbow, 180° Return Bend |
| Radius | Long Radius (1.5D), Short Radius (1D) |
| Bending Radius (Pipe Bends) | R = 2D, 3D, 5D, 10D and custom |
| Special Types | Reducing Elbow, Long Tangent Elbow, Mitre Bend |
| Manufacturing | Seamless (WP) – hot formed / mandrel; Welded (WPW) |
| Heat Treatment | Annealed or Normalized & Tempered; WP91: N 1040–1080°C + T 730–800°C |
| Ends | Bevelled Ends as per ASME B16.25 |
| Marking | As per MSS SP-25 – grade, size, schedule, heat no. |
| Certificates | EN 10204 3.1 / 3.2, IBR, NACE MR0175, TPI Reports |
Grades available for alloy steel elbows
| 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 |
| WP9 | A234 / SA234 WP9 | K90941 | X11CrMo9-1 | 1.7386 | STPA 26 | A335 P9 / A182 F9 |
| WP11 | A234 / SA234 WP11 | K11597 | 13CrMo4-5 | 1.7335 | STPA 23 | A335 P11 / A182 F11 |
| WP22 | A234 / SA234 WP22 | K21590 | 10CrMo9-10 | 1.7380 | STPA 24 | A335 P22 / A182 F22 |
| WP91 | A234 / SA234 WP91 | K90901 | X10CrMoVNb9-1 | 1.4903 | STPA 28 | A335 P91 / A182 F91 |
Weight %, as per ASTM A234
| Grade | C | Mn | P | S | Si | Cr | Mo | Others |
|---|---|---|---|---|---|---|---|---|
| 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 | – |
| WP9 | 0.15 max | 0.30 – 0.60 | 0.030 max | 0.030 max | 1.00 max | 8.0 – 10.0 | 0.90 – 1.10 | – |
| WP11 Cl.1 | 0.05 – 0.15 | 0.30 – 0.60 | 0.030 max | 0.030 max | 0.50 – 1.00 | 1.00 – 1.50 | 0.44 – 0.65 | – |
| WP11 Cl.2 / Cl.3 | 0.05 – 0.20 | 0.30 – 0.80 | 0.040 max | 0.040 max | 0.50 – 1.00 | 1.00 – 1.50 | 0.44 – 0.65 | – |
| 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 | – |
| WP91 | 0.08 – 0.12 | 0.30 – 0.60 | 0.020 max | 0.010 max | 0.20 – 0.50 | 8.0 – 9.5 | 0.85 – 1.05 | Ni 0.40 max, V 0.18–0.25, Nb 0.06–0.10, N 0.03–0.07, Al 0.02 max |
Values at room temperature as per ASTM A234
| Grade | Tensile Strength | Yield Strength (min) | Elongation (Long.) | Elongation (Trans.) | Hardness (max) |
|---|---|---|---|---|---|
| WP5 Cl.1 / WP9 Cl.1 | 415 – 585 MPa (60 – 85 ksi) | 205 MPa (30 ksi) | 30% | 20% | 217 HB |
| WP5 Cl.3 / WP9 Cl.3 | 485 – 655 MPa (70 – 95 ksi) | 275 MPa (40 ksi) | 22% | 14% | 217 HB |
| WP11 Cl.1 | 415 – 585 MPa (60 – 85 ksi) | 205 MPa (30 ksi) | 30% | 20% | 197 HB |
| WP11 Cl.2 | 485 – 655 MPa (70 – 95 ksi) | 275 MPa (40 ksi) | 22% | 14% | 197 HB |
| WP11 Cl.3 | 520 – 690 MPa (75 – 100 ksi) | 310 MPa (45 ksi) | 22% | 14% | 197 HB |
| 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 |
| WP91 | 620 – 840 MPa (90 – 120 ksi) | 415 MPa (60 ksi) | 20% | – | 248 HB |
Typical values (for reference)
| Property | WP5 | WP9 | WP11 | WP22 | WP91 |
|---|---|---|---|---|---|
| Density (g/cm³) | 7.70 | 7.67 | 7.75 | 7.80 | 7.77 |
| Modulus of Elasticity (GPa) | 205 | 205 | 205 | 205 | 218 |
| Thermal Conductivity, 100°C (W/m·K) | 33 | 26 | 37 | 36 | 26 |
| Mean Thermal Expansion, 20–300°C (µm/m·°C) | 11.9 | 11.5 | 12.4 | 12.6 | 11.4 |
| Specific Heat (J/g·°C) | 0.46 | 0.46 | 0.46 | 0.46 | 0.46 |
| Approx. Max. Service Temperature | ≈ 650 °C | ≈ 650 °C | ≈ 595 °C | ≈ 600 °C | ≈ 650 °C |
| ASME P-Number | 5B | 5B | 4 | 5A | 15E |
As per ASME B16.9 / B16.28 – center-to-end dimensions in mm
| NPS | OD at Bevel | 90° LR (A) | 90° SR (A) | 45° LR (B) | 180° LR Center-to-Center (O) | 180° LR Back-to-Face (K) |
|---|---|---|---|---|---|---|
| 1/2" | 21.3 | 38 | – | 16 | 76 | 48 |
| 3/4" | 26.7 | 38 | – | 19 | 76 | 51 |
| 1" | 33.4 | 38 | 25 | 22 | 76 | 56 |
| 1 1/4" | 42.2 | 48 | 32 | 25 | 95 | 70 |
| 1 1/2" | 48.3 | 57 | 38 | 29 | 114 | 83 |
| 2" | 60.3 | 76 | 51 | 35 | 152 | 106 |
| 2 1/2" | 73.0 | 95 | 64 | 44 | 190 | 132 |
| 3" | 88.9 | 114 | 76 | 51 | 229 | 159 |
| 4" | 114.3 | 152 | 102 | 64 | 305 | 210 |
| 5" | 141.3 | 190 | 127 | 79 | 381 | 262 |
| 6" | 168.3 | 229 | 152 | 95 | 457 | 313 |
| 8" | 219.1 | 305 | 203 | 127 | 610 | 414 |
| 10" | 273.1 | 381 | 254 | 159 | 762 | 518 |
| 12" | 323.9 | 457 | 305 | 190 | 914 | 619 |
| 14" | 355.6 | 533 | 356 | 222 | 1067 | 711 |
| 16" | 406.4 | 610 | 406 | 254 | 1219 | 813 |
| 18" | 457.0 | 686 | 457 | 286 | 1372 | 914 |
| 20" | 508.0 | 762 | 508 | 318 | 1524 | 1016 |
| 22" | 559.0 | 838 | 559 | 343 | – | – |
| 24" | 610.0 | 914 | 610 | 381 | 1829 | 1219 |
All dimensions in mm. LR = Long Radius (1.5D), SR = Short Radius (1D). A and B = center-to-end; O = center-to-center; K = back-to-face. Wall thickness is matched to the specified pipe schedule.
Where alloy steel elbows are used
Main steam and hot reheat line routing around turbines and boilers.
180° return bends in refinery fired heater coils.
Transfer lines and hot hydrocarbon process piping.
U-bend and return circuits in high-temperature exchangers.
Cracker and reformer piping requiring creep strength.
Superheater links, headers and HRSG interconnecting piping.
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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