A complete reference to all material categories permitted under Indian Boiler Regulations — specifications, chemical requirements, testing, and certification for each type.
Click any category to expand the full IBR requirements — specifications, heat treatment, chemical composition, testing, and required IBR certificate form.
Open Hearth / Electric Furnace / Basic Oxygen Process
Plates >12 mm: Normalized. All plates fully killed. Semi-killed allowed if UTS ≤ 56 Kg/mm², thickness ≤ 50 mm, temp 0–450°C.
| Element | Requirement |
|---|---|
| C | 0.25% max |
| S | 0.05% max |
| P | 0.05% max |
| Si | 0.35% max |
| Mn | 0.4–0.9% |
Well-known maker: not required. Unknown maker: required (IBR approved TPI).
Hot finished OR Cold drawn — pipe shall be seamless
Cold drawn: Annealed or Normalized. Hot finished: no further HT required. All fully killed.
| Element | Requirement |
|---|---|
| C | 0.25–0.30% (varies by grade) |
| S | 0.035% max |
| P | 0.035% max |
| Si | 0.10% min |
| Mn | 0.27–1.06% |
Well-known maker: not required. Unknown maker: required (IBR approved TPI).
Hot finished OR Cold drawn
Cold drawn: Annealed or Normalized. Hot finished: no HT required. All fully killed.
| Element | Requirement |
|---|---|
| C | 0.06–0.30% (varies by grade) |
| S | 0.035% max |
| P | 0.035% max |
| Si | 0.10–0.25% |
| Mn | 0.27–1.06% |
Well-known maker: not required. Unknown maker: required (IBR approved TPI).
Cold drawn, Electric Resistance Welding (ERW)
Annealed or Normalized. Up to 400°C: semi/fully killed. Above 400°C: fully killed.
| Element | Requirement |
|---|---|
| C | 0.12–0.18% (varies by grade) |
| S | 0.035% max |
| P | 0.035% max |
| Si | 0.10–0.35% |
| Mn | 0.30–1.20% |
Well-known maker: not required. Unknown maker: required (IBR approved TPI).
Forging method
Per selected material spec or as required by client.
| Element | Requirement |
|---|---|
| C | Per spec |
| S | 0.05% max |
| P | 0.05% max |
| Si | Per spec |
| Mn | Per spec |
Well-known forger: not required. Unknown forger: required (IBR approved TPI).
Forging method, HT during various stages and after completion
Heat treated during manufacturing stages and after forging completion per material spec.
| Element | Requirement |
|---|---|
| C | Per spec |
| S | 0.05% max |
| P | 0.05% max |
| Si | Per spec |
| Mn | Per spec |
Well-known forger: not required. Unknown forger: required (IBR approved TPI).
Hot finished OR Cold drawn — pipe shall be seamless
All grades except T91: Annealed or Normalized & Tempered (min 650°C for T2/T11/T12; 675°C for T5/T9/T22). T91: Normalized at 1040°C, tempered at 730°C min.
| Element | Requirement |
|---|---|
| Grade T2 | C: 0.1–0.2, Cr: 0.5–0.81, Mo: 0.44–0.65 |
| Grade T11 | C: 0.05–0.15, Cr: 1.0–1.5, Mo: 0.44–0.65 |
| Grade T22 | C: 0.05–0.15, Cr: 1.90–2.60, Mo: 0.87–1.13 |
| Grade T91 | C: 0.08–0.12, Cr: 8–9.50, Mo: 0.85–1.05 |
Well-known maker: not required. Unknown maker: required (IBR approved TPI).
Hot finished OR Cold drawn — tube shall be seamless
All grades except T91: Annealed or Normalized & Tempered. T91: Normalized at 1040°C, tempered at 730°C min.
| Element | Requirement |
|---|---|
| Grade T2 | C: 0.1–0.2, Cr: 0.5–0.81, Mo: 0.44–0.65 |
| Grade T11 | C: 0.05–0.15, Cr: 1.0–1.5, Mo: 0.44–0.65 |
| Grade T22 | C: 0.05–0.15, Cr: 1.90–2.60, Mo: 0.87–1.13 |
| Grade T91 | C: 0.08–0.12, Cr: 8–9.50, Mo: 0.85–1.05 |
Well-known maker: not required. Unknown maker: required (IBR approved TPI).
Hot finished OR Cold drawn — tube shall be seamless
Standard grades: Annealed at 1040°C then rapid water quench. H grades (304H, 316H, 321H, 347H): higher solution treatment temperatures.
| Element | Requirement |
|---|---|
| Grade 304 | C: 0.08 max, Cr: 18–20, Ni: 8–11 |
| Grade 316 | C: 0.08 max, Cr: 16–18, Ni: 11–14 |
| Grade 321 | C: 0.08 max, Cr: 17–20, Ni: 9–13 |
| Grade 347 | C: 0.08 max, Cr: 17–20, Ni: 9–13 |
Well-known maker: not required. Unknown maker: required (IBR approved TPI).
Fire refined OR Electrolytic, hot rolled, free from cracks
All plates: Annealed
| Element | Requirement |
|---|---|
| Cu | 99.2% min |
| As | 0.30–0.50% |
| Sb | 0.05% max |
| Bi | 0.05% max |
| O₂ | 0.10% max |
Well-known maker: not required. Unknown maker: required (IBR approved TPI).
Fire refined or Electrolytic. Hot or cold drawn, finished cold drawn.
All tubes: Annealed
| Element | Requirement |
|---|---|
| Cu | 99.2% min |
| As | 0.30–0.50% |
| Sb | 0.05% max |
| Bi | 0.05% max |
| O₂ | 0.10% max |
Well-known maker: not required. Unknown maker: required (IBR approved TPI).
Fire refined or Electrolytic. Hot or cold drawn, finished cold drawn.
All tubes: Annealed
| Element | Requirement |
|---|---|
| Cu | 70–73% |
| Zn | 25–30% |
| Other | 0.75% per spec |
Well-known maker: not required. Unknown maker: required (IBR approved TPI).