IBR Socket Weld & Threaded Fittings — IBR Forged Fittings
Teshi Group manufactures IBR forged fittings — socket weld and threaded elbows, tees, couplings, half couplings, caps, unions and olets — for small-bore boiler drains, vents, instrument and steam trap lines.
Fittings are forged to ASME B16.11 in SA105 and SA182 F11, F22 and F91, Class 3000, 6000 and 9000, inspected by the Inspecting Authority and certified on Form III-C.
Specification
| Supply | OEM manufacturer — Teshi Group, India |
|---|---|
| Products | Socket weld and threaded 90°/45° elbows, tees, crosses, full and half couplings, caps, plugs, bushings, unions, swage nipples, weldolets and sockolets |
| Dimensional standard | ASME B16.11; MSS SP-83 unions; MSS SP-95 swage nipples; MSS SP-97 olets; ASME B1.20.1 NPT threads |
| Size range | NPS ⅛″–4″ |
| Pressure class | 3000, 6000, 9000 (socket weld 3000–9000; threaded 2000–6000) |
| Materials | SA105, SA350 LF2; SA182 F1, F5, F9, F11, F22, F91; SA182 F304/F316 |
| Certificates | IBR Form III-C countersigned by the Inspecting Authority; EN 10204 3.1 |
What makes it IBR
- Material from IBR-acceptable mills, traceable by heat number
- Manufacture and tests verified by the Inspecting Authority
- Hard-stamped with grade, size, heat number and inspection marking
- Supplied with the IBR certificate (Form III-C) signed by the maker and countersigned by the Inspecting Authority
- EN 10204 3.1 mill test certificate and dimensional report with every lot
IBR grades and minimum strength
| Alloy | Typical IBR service | Grade | YieldMPa min | TensileMPa min |
|---|---|---|---|---|
| Carbon steel | Feed water, saturated and moderate superheated steam up to about 425 °C | ASTM A105 | 250 | 485 |
| Carbon steel, higher strength | Higher-pressure carbon steel steam lines | ASTM A105 | 250 | 485 |
| C-½Mo | Moderate-temperature steam | ASTM A182 F1 | 275 | 485 |
| 1¼Cr-½Mo | Superheated steam to about 550 °C | ASTM A182 F11 Cl.2 | 275 | 485 |
| 2¼Cr-1Mo | Main steam and hot reheat to about 580 °C | ASTM A182 F22 Cl.3 | 310 | 515 |
| 9Cr-1Mo-V (Grade 91) | Supercritical main steam and hot reheat to about 600 °C | ASTM A182 F91 | 415 | 620 |
| 9Cr-2W (Grade 92) | Ultra-supercritical main steam | ASTM A182 F92 | 440 | 620 |
How Teshi Group makes and certifies IBR material
Order review
Confirm IBR applicability, design pressure and temperature, material grade, size, rating and the Inspecting Authority named in the order.
IBR-acceptable raw material
Forging bar, billets, plate or pipe bought with mill certificates acceptable under IBR (Well-known Steel Maker or Inspecting Authority-tested material), recorded by heat number.
Manufacture
Forging, heat treatment and machining to ASME B16.5, B16.47, B16.9 or B16.11, with the heat number transferred to every piece.
Inspection and testing
Chemical and mechanical tests, hardness, dimensional inspection and NDT as required, witnessed and verified by the Inspecting Authority.
Stamping and certificate
Each piece is hard-stamped and the IBR certificate of manufacture and test is signed by Teshi Group and countersigned by the Inspecting Authority.
Dispatch
Material ships with the IBR certificate, EN 10204 3.1 mill test certificates and the dimensional report, traceable piece by piece.
IBR certificates
| Certificate (IBR 1950 name) | What it certifies | Used for |
|---|---|---|
| Form III-A | Certificate of manufacture and test of steam pipes | IBR pipes |
| Form III-B | Certificate of manufacture and test of tubes, signed by the Inspecting Authority or a Well-known Tube Maker | Boiler tubes |
| Form III-C | Certificate of manufacture and test of boiler mountings and fittings — the certificate buyers ask for with IBR flanges, fittings and valves | IBR flanges and fittings |
| Form III-F | Certificate of manufacture and test of castings, by the Inspecting Authority or a Well-known Foundry | Cast valve bodies |
| Form III-G | Certificate of manufacture and test of forgings, by the Inspecting Authority or a Well-known Forge | Forgings |
| Form IV | Steel maker's certificate of manufacture and test (Well-known Steel Maker) | Raw material |
| Form IV-A | Certificate of material tested by the Inspecting Authority where the maker's certificate is not available | Raw material |
The Indian Boiler Regulations, 2026 consolidate these certificates under a renumbered set of forms. Until your boiler inspectorate confirms the form required on a specific job, buyers and inspectors still refer to the 1950 names — Form III-A for pipes and Form III-C for flanges and fittings — and Teshi Group issues the certificate in the form prescribed at the time of supply.
IBR in 2026: the current rules
| Act | The Boilers Act, 2025 (Act No. 12 of 2025) — in force from 1 May 2025; it repealed the Indian Boilers Act, 1923 |
|---|---|
| Regulations | Indian Boiler Regulations, 2026 — published in the Gazette of India on 1 October 2026, replacing the Indian Boiler Regulations, 1950 |
| Regulator | Central Boilers Board (Ministry of Commerce & Industry, DPIIT); Technical Adviser (Boilers) is its Member-Secretary |
| Scope | “Boiler components” include steam piping, feed piping and any mounting or fitting subject to pressure above 1 kg/cm² gauge |
| Inspection | Inspecting Authority — the state boiler directorate (in West Bengal, the Directorate of Boilers) or a body recognised by the Central Boilers Board |
| International codes | Materials and designs to ASME, BS, EN, DIN and JIS can be accepted under the regulations, certified through the Inspecting Authority |
Who needs IBR material
Any pipe, flange, fitting or valve in a boiler, steam pipe or feed pipe within the scope of the Boilers Act, 2025 must be made from acceptable material and supplied with a certificate of manufacture and test endorsed by an Inspecting Authority. That covers power plants, captive and cogeneration plants, sugar, paper, textile, food, chemical and refinery steam systems across India.
Lines outside that scope — utility water, air or low-pressure services — usually do not need IBR certification. Your plant's boiler inspectorate decides the boundary.
FAQ
IBR Socket Weld & Threaded Fittings: common questions
Which ASME standard covers IBR socket weld fittings?
ASME B16.11 sets the dimensions and pressure classes; the IBR certificate covers material, manufacture and testing.
What class of socket weld fitting is used on IBR lines?
Class 3000 for most steam drains and vents, Class 6000 or 9000 for high-pressure boiler service — chosen to match the pipe schedule.
Do you make IBR fittings in F91?
Yes, in SA182 F91 with controlled normalising and tempering, hardness checks and PMI, certified by the Inspecting Authority.
IBR products and resources
IBR flanges
Weld neck, slip-on, socket weld and blind flanges with IBR certificates
ViewOEM manufacturerIBR butt-weld fittings
Elbows, tees, reducers and caps in WPB, WP11, WP22 and WP91
ViewStockist & supplierIBR pipes
Seamless SA106 Gr B, P11, P22 and P91 pipe with Form III-A
ViewGuideIBR certificates — Form III-A, III-C and more
Which certificate goes with which product
ViewOverviewAll IBR products
IBR flanges, fittings and pipes from Teshi Group
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