IBR SA335 P11 Pipes
Teshi Group is an IBR approved stockist and supplier of IBR SA335 P11 pipes in India — seamless pipe to ASME B36.10, NPS ½″–24″, SCH 40 to SCH 160 and XXS — for superheated steam to about 550 °C.
Every lot is inspected by the Inspecting Authority and supplied with the IBR certificate of manufacture and test (Form III-A), EN 10204 3.1 mill certificates and full heat-number traceability.
IBR SA335 P11 Pipes at a glance
| Supply | Stockist and supplier — Teshi Group, India |
|---|---|
| Material | ASTM A335 P11 · ASME SA-335 P11 |
| UNS | K11597 |
| EN equivalent | 13CrMo4-5 |
| Chinese GB equivalent | 15CrMoG (GB/T 5310) / 14Cr1MoR (GB/T 713.2) |
| Products | seamless pipe to ASME B36.10, NPS ½″–24″, SCH 40 to SCH 160 and XXS |
| Typical IBR service | Superheated steam to about 550 °C |
| Certificate | IBR Form III-A countersigned by the Inspecting Authority; EN 10204 3.1 |
Chemical composition and strength
| Grade | C% | Cr% | Mo% | YieldMPa min | TensileMPa min | Heat treatment |
|---|---|---|---|---|---|---|
| ASTM A335 P11 | 0.05–0.15 | 1.00–1.50 | 0.44–0.65 | 205 | 415 | Full or isothermal anneal, or normalized & tempered (temper 650 °C min) |
Matching IBR components
| Component | Grade | IBR certificate |
|---|---|---|
| Pipe | ASTM A335 P11 | Form III-A |
| Butt-weld fittings | ASTM A234 WP11 Cl.1 | Form III-C |
| Flanges & forged fittings | ASTM A182 F11 Cl.2 | Form III-C |
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.
FAQ
IBR SA335 P11 Pipes: common questions
Do you supply SA335 P11 pipes with IBR certificates?
Yes. Teshi Group supplies IBR SA335 P11 pipes with the IBR certificate (Form III-A) countersigned by the Inspecting Authority, plus EN 10204 3.1 mill test certificates.
What is the minimum yield strength of SA335 P11?
205 MPa, with a minimum tensile strength of 415 MPa.
Where is SA335 P11 used in IBR piping?
For superheated steam to about 550 °C.
Which grades match SA335 P11 in an IBR line?
ASTM A335 P11 pipe, ASTM A234 WP11 Cl.1 butt-weld fittings and ASTM A182 F11 Cl.2 flanges.
What is the Chinese equivalent of SA335 P11?
The nearest Chinese grade is 15CrMoG (GB/T 5310) / 14Cr1MoR (GB/T 713.2).
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