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 equal and reducing buttweld tees and crosses for branching high-temperature steam, boiler and process piping.
Tubewell Steel & Engg. Co. is a Mumbai-based manufacturer, stockist and supplier of alloy steel tees in ASTM A234 WP5, WP9, WP11, WP22 and WP91. Our seamless and welded equal tees, reducing tees and crosses provide strong, smooth branch connections in chrome-moly piping operating at high temperature and pressure.
Branch connections built for high-temperature alloy piping
Alloy steel buttweld tees split or combine flow at 90° in chrome-moly piping systems. An equal (straight) tee has the same size on the run and branch, while a reducing tee has a smaller branch outlet. Crosses provide four-way connections. Because the branch region of a tee carries the highest stresses in a piping system, a seamless, properly heat-treated A234 tee gives far better reliability than a fabricated stub-in branch, especially in creep service.
Our tees are manufactured by hydraulic bulging or hot extrusion of seamless A335 pipe, followed by heat treatment appropriate to the grade – annealed or normalized and tempered for WP5 to WP22, normalized and tempered for WP91. Run and outlet center-to-end dimensions conform to ASME B16.9, ends are bevelled per ASME B16.25 and every tee is supplied with EN 10204 3.1 certificates, with IBR and TPI available on request.
Standard supply range for alloy steel buttweld tees
| 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, 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 |
| Tee Types | Equal (Straight) Tee, Reducing Tee, Barred Tee |
| Cross Types | Equal Cross, Reducing Cross |
| Other Branch Fittings | Lateral (45° Y-Tee), Reducing Outlet Tee |
| Manufacturing | Seamless (WP) – hydraulic bulge / hot extrusion; 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. |
| Testing | RT (welded), UT, MPI / DPT, Hardness, PMI, Dimensional |
| Certificates | EN 10204 3.1 / 3.2, IBR, NACE MR0175, TPI Reports |
Grades available for alloy steel tees
| 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 – equal tees & crosses, center-to-end in mm
| NPS | OD at Bevel | Run Center-to-End (C) | Outlet Center-to-End (M) | Cross (C = M) |
|---|---|---|---|---|
| 1/2" | 21.3 | 25 | 25 | 25 |
| 3/4" | 26.7 | 29 | 29 | 29 |
| 1" | 33.4 | 38 | 38 | 38 |
| 1 1/4" | 42.2 | 48 | 48 | 48 |
| 1 1/2" | 48.3 | 57 | 57 | 57 |
| 2" | 60.3 | 64 | 64 | 64 |
| 2 1/2" | 73.0 | 76 | 76 | 76 |
| 3" | 88.9 | 86 | 86 | 86 |
| 4" | 114.3 | 105 | 105 | 105 |
| 5" | 141.3 | 124 | 124 | 124 |
| 6" | 168.3 | 143 | 143 | 143 |
| 8" | 219.1 | 178 | 178 | 178 |
| 10" | 273.1 | 216 | 216 | 216 |
| 12" | 323.9 | 254 | 254 | 254 |
| 14" | 355.6 | 279 | 279 | 279 |
| 16" | 406.4 | 305 | 305 | 305 |
| 18" | 457.0 | 343 | 343 | 343 |
| 20" | 508.0 | 381 | 381 | 381 |
| 22" | 559.0 | 419 | 419 | 419 |
| 24" | 610.0 | 432 | 432 | 432 |
All dimensions in mm. C = center of tee to end of run; M = center of tee to end of outlet. For equal tees and crosses, C and M are equal.
| Reducing Tee (Run × Branch) | Run OD | Branch OD | Run (C) | Outlet (M) |
|---|---|---|---|---|
| 2" × 1 1/2" | 60.3 | 48.3 | 64 | 60 |
| 2" × 1" | 60.3 | 33.4 | 64 | 51 |
| 3" × 2" | 88.9 | 60.3 | 86 | 76 |
| 4" × 3" | 114.3 | 88.9 | 105 | 98 |
| 4" × 2" | 114.3 | 60.3 | 105 | 89 |
| 6" × 4" | 168.3 | 114.3 | 143 | 130 |
| 6" × 3" | 168.3 | 88.9 | 143 | 124 |
| 8" × 6" | 219.1 | 168.3 | 178 | 168 |
| 8" × 4" | 219.1 | 114.3 | 178 | 156 |
| 10" × 8" | 273.1 | 219.1 | 216 | 203 |
| 10" × 6" | 273.1 | 168.3 | 216 | 194 |
| 12" × 10" | 323.9 | 273.1 | 254 | 241 |
| 12" × 8" | 323.9 | 219.1 | 254 | 229 |
Popular reducing tee sizes shown. All other ASME B16.9 run × branch combinations are available on request.
Where alloy steel tees are used
Branching main and auxiliary steam lines in power plants.
Header outlets and drain / vent branches on boilers.
Heater pass splits and process manifolds in hot service.
Reactor feed and effluent distribution networks.
Reducing branches for safety valves and instrumentation.
Ammonia plant manifolds in hydrogen service.
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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