Carbon Steel Tee — Butt-Weld Equal Tee | Factory Direct | Huaxia-Steel
Carbon steel tee is a butt-weld pipe fitting with three openings in a T-shape – one run and a 90 degree branch. It is the most common way to add a branch line or split flow in carbon steel process piping, plumbing, fire protection, and oil & gas gathering systems.
Huaxia-Steel supplies carbon steel tee in equal (straight) and reducing (branch smaller than run) configurations, in ASTM A234 / ASME B16.9 standard dimensions, with raw, black, or hot-dip galvanized finishes. Mills are WPHY / ASME B16.9 certified and we deliver globally with full EN 10204 3.1 mill test certificates.
Product Overview
Our equal tee is formed by hot extrusion or hot forging of a solid round billet. The branch opening is then machined and bevelled to accept a butt-weld joint. For seamless tees, the run and branch are both seamless; for welded tees, the branch can be welded onto a seamless or ERW run pipe. Each tee is dimensionally inspected and pressure-tested before shipment.
- Standard: ASME B16.9, ASME B16.11 (socket-weld), MSS SP-75 (high yield).
- Material grades: ASTM A234 WPB / WPC, ASTM A420 WPL6, ASME SA234, ASTM A106 Gr.B, API 5L X42-X65.
- Types: Equal tee (straight), reducing tee, barred tee, bull-head tee.
- Ends: Butt-weld beveled; optional socket-weld, threaded, or flanged ends.
- Finish: Black, hot-dip galvanized (per ASTM A153), or anti-rust varnish.
Size Range and Specifications
| Parameter | Range |
|---|---|
| NPS (run / branch) | 1/2″ to 48″ (DN 15 to DN 1200) |
| Wall thickness | SCH 10 to SCH 160, XXS |
| Center-to-end dimension C (run / branch) | Per ASME B16.9 Table for equal / reducing |
| Bore diameter tolerance | +/- 1% of nominal, per ASME B16.9 |
| Out-of-roundness | Within 1% for sizes through NPS 12; 2% above NPS 12 |
| Bevel angle | 37.5 degrees +/- 2.5 degrees, root face 1.6 mm +/- 0.8 mm |
| Length tolerance (overall) | +/- 2 mm for NPS ≤ 4; +/- 3 mm for NPS 6-12; +/- 5 mm above |
Weight Reference Table (Equal Tees, SCH 40)
| NPS (Equal Tee) | Run OD x Wall (mm) | C-C dimension (mm) | Approx. weight (kg) |
|---|---|---|---|
| 2 | 60.3 x 3.91 | 64 | 1.0-1.3 |
| 3 | 88.9 x 5.49 | 89 | 2.5-3.2 |
| 4 | 114.3 x 6.02 | 102 | 4.0-5.2 |
| 6 | 168.3 x 7.11 | 140 | 11-14 |
| 8 | 219.1 x 8.18 | 178 | 22-26 |
| 10 | 273.0 x 9.27 | 216 | 36-44 |
| 12 | 323.8 x 10.31 | 254 | 55-68 |
| 14 | 355.6 x 11.13 | 279 | 80-100 |
| 16 | 406.4 x 12.70 | 305 | 120-150 |
| 18 | 457.0 x 14.27 | 343 | 175-220 |
| 20 | 508.0 x 15.09 | 381 | 240-300 |
| 24 | 609.6 x 17.48 | 432 | 400-510 |
Available Grades and Materials
| Grade | Standard | Carbon % | Yield (min, MPa) | Typical Use |
|---|---|---|---|---|
| WPB | ASTM A234 | 0.30 max | 240 | High-temp carbon steel, common workhorse |
| WPC | ASTM A234 | 0.35 max | 275 | Higher strength, low-temp applications |
| WPHY-42 | ASTM A860 | 0.30 max | 290 | High yield for transmission pipelines |
| WPHY-52 | ASTM A860 | 0.30 max | 360 | Higher pressure pipelines |
| WPHY-60 | ASTM A860 | 0.30 max | 415 | High-pressure services |
| WPHY-65 | ASTM A860 | 0.30 max | 450 | High-strength pipeline fittings |
| WP11 CL2 | ASTM A234 | 0.15-0.30 (C-Mo) | 205 | Higher temperature (520-595 degrees C) |
Manufacturing Standards
- ASME B16.9 – Factory-Made Wrought Butt-Welding Fittings.
- ASME B16.11 – Socket-Welding and Threaded Fittings (for forged tees).
- ASTM A234 – Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service.
- ASTM A860 – Wrought High-Strength Low-Alloy Butt-Welding Fittings (WPHY series).
- MSS SP-75 – High-Strength Butt-Welding Fittings for High-Pressure Gas Transmission.
- EN 10253-2 – Butt-welding pipe fittings of wrought carbon and alloy steel.
Applications
- Oil & gas gathering and transmission.
- Refinery and petrochemical process piping.
- Power plant – boiler feed, condensate, cooling water.
- Chemical and fertilizer plants.
- Water and waste water treatment.
- HVAC distribution lines (large buildings, district cooling).
- Fire protection mains and standpipes.
- Marine and offshore piping.
Quality Assurance
Every batch of carbon steel tee is tested and documented:
- Chemical analysis per heat (spectrometer).
- Mechanical tests: tensile strength, yield, elongation per ASTM A370.
- Hardness test on delivery condition.
- Hydrostatic test: 1.5 x design pressure per ASTM A234 Section 11.
- Dimensional inspection: OD, wall, center-to-end, bevel angle, root face.
- Surface visual inspection for cracks, laps, and porosity.
- NDE: MT on weld seams for welded tees; UT on 100% of seamless tees.
- MTC to EN 10204 3.1; 3.2 with third-party witness on request.
- ISO 9001 quality system at the mill.
Pressure Ratings and Temperature Limits
| Grade | Allowable Pressure (psig) at 0-100 degrees C | Allowable Pressure at 300 degrees C | Allowable Pressure at 450 degrees C |
|---|---|---|---|
| WPB | Schedule 40: 700; SCH 80: 1,070 | 520 | 370 |
| WPC | Schedule 40: 750; SCH 80: 1,180 | 560 | 400 |
| WPHY-42 | Schedule 40: 870; SCH 80: 1,330 | 650 | 510 |
| WPHY-52 | Schedule 40: 1,030; SCH 80: 1,640 | 810 | 630 |
| WPHY-60 | Schedule 40: 1,180; SCH 80: 1,890 | 940 | 740 |
Pressure ratings above are for water and non-shock service per ASME B16.9 and ASME B31.3. For petroleum, oil, gas, or steam applications, refer to the specific code.
Packaging and Shipping
- Plain (black): wrapped in VCI paper or anti-rust plastic, then wooden crate or pallet.
- Hot-dip galvanized: bundled, plastic wrapped, with end caps to protect internal threads (if any).
- Each piece tagged with grade, size, schedule, heat number, and standard.
- Export plywood crates or wooden boxes for fittings up to NPS 24.
- Bulk pack (without crate) for large fittings above NPS 24, strapped to wooden pallets.
- Container loading supervised and documented on request.
Frequently Asked Questions
Q1: What is the difference between an equal tee and a reducing tee?
An equal tee has three openings of the same nominal size (e.g., 6″ x 6″ x 6″). A reducing tee has a smaller branch than run (e.g., 6″ x 6″ x 4″). Reducing tees are heavier and require custom forging.
Q2: Can I use ASME B16.9 tee for high-pressure gas service?
Yes, provided the grade matches the design pressure. WPHY-42, -52, -60, and -65 grades from ASTM A860 cover high-pressure gas transmission per MSS SP-75.
Q3: Is hot-dip galvanizing available for tees?
Yes. Most carbon steel tees can be hot-dip galvanized per ASTM A153. Specify “HDG” in your RFQ. Galvanizing adds 1-4 weeks to lead time depending on quantity and size.
Q4: What is the lead time for 100 pieces of NPS 12 SCH 40 WPB equal tee?
Typically 3-6 weeks for stock items; 6-10 weeks for non-stock sizes. Production lead time can be reduced by 30-40% if the mill has standard tooling.
Q5: Do you supply reducing tees with custom branch sizes?
Yes, custom runs like 16″ x 16″ x 12″ or 20″ x 20″ x 14″ are common. Provide C-C dimensions if not standard, and we will check shop capability.
Q6: Is third-party inspection available?
Yes. SGS, BV, Intertek, TUV, and ABS inspections are regularly coordinated at our mills.
Q7: Are CE / PED markings available for European imports?
Yes, with EN 10204 3.1 MTC and CE marking per PED 2014/68/EU when the fitting is part of pressure equipment.
Conclusion
Carbon steel tee is one of the most common pipe fittings in process and pipeline service. The right grade selection (WPB, WPC, WPHY series) depends on pressure, temperature, and material of the connecting pipe. Equal and reducing configurations are both routinely available with EN 10204 3.1 documentation and third-party inspection.
Huaxia-Steel supplies ASTM A234 / ASME B16.9 carbon steel tees in equal and reducing configurations, with full grade, size, and schedule range. Send your tee specification, schedule, grade, and quantity for a quote.
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