Carbon Steel Tee — Factory Direct Supplier | Huaxia-Steel
Huaxia-Steel supplies carbon steel tees for pipeline branching applications across oil and gas, chemical processing, power generation, and water infrastructure sectors. Manufactured to ASME B16.9, ASTM A234 WPB, and EN 10253-1 standards, our tees are available as equal tees (all outlets same diameter) and reducing tees (branch smaller than run) with sizes from 1/2 inch to 48 inches. We offer both seamless and welded construction, full material traceability, and factory-direct pricing with global shipping capability.
Product Overview
A pipe tee is a T-shaped fitting with three openings used to combine or divide fluid flow in a piping system. The straight-through portion is called the “run” (with two openings), while the perpendicular outlet is the “branch.” Equal tees have identical run and branch diameters, while reducing tees feature a branch diameter smaller than the run — essential when connecting a smaller service line to a larger main pipeline.
Carbon steel tees in ASTM A234 WPB grade withstand temperatures up to 425°C in continuous service and are compatible with all standard welding procedures. The wrought construction provides grain flow patterns that enhance mechanical integrity compared to cast fittings, making WPB tees the preferred choice for pressure piping systems.
Specifications and Dimensions
| Parameter | Specification |
|---|---|
| Type | Equal tee, Reducing tee |
| Run Size | 1/2″ to 48″ (seamless to 24″, welded above) |
| Branch Size | 1/2″ to 48″ (reducing tees: branch ≤ run) |
| Schedule | Sch 10, Sch 20, Sch 40, Sch 80, Sch 120, Sch 160, Sch XXS |
| End Connection | Butt-weld (BW); threaded or socket-weld on request |
| Construction | Seamless (≤ 24″), Welded (> 24″ or heavy wall) |
| Dimensional Standard | ASME B16.9, MSS SP-75, EN 10253-1/2 |
Equal Tee Dimensions (ASME B16.9, Sch 40)
| Nominal Size | Center-to-End Run (C) | Center-to-End Branch (M) |
|---|---|---|
| 1/2″ | 25 | 25 |
| 3/4″ | 29 | 29 |
| 1″ | 38 | 38 |
| 1-1/2″ | 48 | 48 |
| 2″ | 57 | 57 |
| 3″ | 76 | 76 |
| 4″ | 89 | 89 |
| 6″ | 114 | 114 |
| 8″ | 140 | 140 |
| 10″ | 165 | 165 |
| 12″ | 190 | 190 |
| 16″ | 229 | 229 |
Material Grades and Standards
| Standard | Grade | Yield (MPa) | Tensile (MPa) | Service Temp |
|---|---|---|---|---|
| ASTM A234 | WPB | 240 | 415 | -20°C to 425°C |
| ASTM A234 | WPC | 275 | 485 | -20°C to 470°C |
| ASTM A420 | WPL6 | 240 | 415 | -45°C to 340°C |
| EN 10253-2 | P235GH | 235 | 360–480 | -20°C to 400°C |
| EN 10253-2 | P265GH | 265 | 410–530 | -20°C to 400°C |
| JIS B2312 | STPG370 | 215 | 370 | Up to 350°C |
Manufacturing Process
Seamless Equal Tees (Hydroforming / Extrusion)
Seamless tees up to 24 inches are produced by hydroforming or extrusion from solid steel billets. The process involves heating a cylindrical billet to forging temperature, placing it in a die cavity, and applying hydraulic pressure to expand the material into the T-shape. This method produces uniform wall thickness with superior mechanical properties and no weld seams in critical areas.
Welded Tees (Plate Fabrication)
Larger tees or reducing tees with significant diameter ratios are fabricated from steel plate. The run pipe is prepared with a branch opening, and a branch stub is welded in place using full-penetration welds. All welds are stress-relieved when required by code and inspected by RT or UT per ASME B16.9 and ASME Section IX.
Reducing Tee Manufacturing
Reducing tees require more complex tooling due to the diameter transition. Small branch reducing tees are often produced by cold or hot forming from larger equal tees. Large reducing tees are fabricated by welding a formed branch piece to the run pipe, with reinforcement pads added when required by design code for pressure containment.
Applications
- Oil and Gas Pipelines: Mainline branching, station piping, gathering systems
- Refineries and Petrochemical: Process unit piping, fractionation column connections
- Power Plants: Steam distribution, feedwater headers, cooling water mains
- Water and Wastewater: Distribution network branching, treatment plant process piping
- HVAC Systems: Chilled water headers, heating distribution mains
- Fire Protection: Sprinkler system mains with branch connections to zones
- Shipbuilding: Bilge, ballast, and fire-fighting distribution systems
Equal Tee vs. Reducing Tee Selection
| Application | Recommended Type | Reasoning |
|---|---|---|
| Main pipeline with same-size branch | Equal tee | Equal flow division; standard specification |
| Main line to smaller service line | Reducing tee | Matches pipe sizes; avoids additional reducer |
| Pump suction from header | Reducing tee (eccentric branch) | Maintains flat top; prevents air pocket |
| Instrument connection | Reducing tee | Small branch for probe or gauge |
| Fire zone isolation | Equal tee | Same pipe size for consistent flow/pressure |
Surface Treatment Options
| Treatment | Specification | Application |
|---|---|---|
| Black (oiled) | Standard mill finish | Indoor; painted later |
| Shot-blasted + primer | SA 2.5, epoxy zinc primer | Offshore; corrosive atmosphere |
| Hot-dip galvanized | ASTM A153, ≥ 600 g/m² | Water lines; atmospheric exposure |
| 3LPE | DIN 30670 | Buried pipelines |
| FBE internal/external | AWWA C213 | Corrosive fluid service |
Quality Assurance
Huaxia-Steel implements comprehensive quality control for every tee:
- Incoming Material Control: PMI testing on steel billets/plate; chemical composition verification
- Dimensional Control: C and M dimensions, wall thickness at crotch and extruded areas, ovality, bevel angle
- Mechanical Testing: Tensile test, hardness test (HBW or HRB), flattening test on sample pieces per heat
- NDT Inspection:
- Ultrasonic testing (UT) on all seamless tees
- Radiographic testing (RT) on welded tees — 100% of circumferential welds
- Magnetic particle testing (MT) or liquid penetrant testing (PT) for surface defects
- Hydrostatic Testing: Optional; conducted at 1.5× design pressure when specified
- Final Inspection: Visual examination per MSS SP-54 acceptance criteria; marking verification
All orders ship with EN 10204 3.1 Mill Test Certificate, NDE test reports, and dimensional inspection certificates.
Packaging and Shipping
- Small tees (≤ 8″): Nested packing in wooden crates with cardboard separators
- Medium tees (10″–20″): Individual VCI wrapping, bundled on pallets
- Large tees (> 20″): Individual skidding with lifting lugs for safe handling
- Marking: Size, schedule, grade, heat number, standard, and country of origin marked permanently
- Container Loading: Optimized stowage with other butt-weld fittings to maximize space utilization
Ordering Information
For a detailed quotation, please specify:
- Type: Equal tee or Reducing tee
- Run size and branch size (for reducing tees)
- Schedule/wall thickness
- Standard: ASME B16.9, EN 10253-1/2, or JIS B2312
- Material grade: ASTM A234 WPB or equivalent
- Quantity (pieces)
- Surface treatment
- NDT requirements (RT, UT, MT, PT)
- Destination port and Incoterms
Contact Huaxia-Steel for competitive pricing on carbon steel tees. We stock common sizes for immediate shipment and manufacture custom dimensions with industry-leading lead times. Request your tee quotation today and receive a detailed proposal within 24 hours.
