Seamless Boiler Pipes Supplier & Exporter
Amardeep Steel Centre LLP is a supplier, manufacturer and exporter of seamless boiler pipes to refineries, power plants, heat exchanger fabricators as well as EPC contractors in India and more than 100 countries. We have on-board certified carbon steel and alloy steel boiler pipes of ASTM, ASME, IBR, DIN, BS, and JIS standards with full Mill Test Certificates, third party inspection support and dispatched within a week right out of our Mumbai warehouse.
We provide full traceability of materials of every pipe that we deliver. It is to say that EN 10204 3.1B MTCs, heat and lot numbers and full test documentation including chemical composition, mechanical properties, hydrostatic pressure testing, and non-destructive examination - your QC team will have everything required without having to hunt the paperwork.
What Are Boiler Pipes?
Boiler pipes are seamless or welded steel pipes designed to convey steam, hot water, or hot gases under elevated temperature and pressure conditions. Unlike standard structural or fluid-service pipe, boiler pipe material must meet strict mechanical property minimums — tensile strength, yield strength, elongation, and creep resistance — that are verified by mandatory testing at the mill and on delivery.
Boiler pipes are primarily used in:
- Steam boilers — to transport pressurised steam from the drum to the superheater, reheater, and distribution headers
- Heat exchangers and economisers — where tubes carry feed water being preheated by flue gas
- Fossil fuel and gas-fired power plants — from subcritical to ultra-supercritical (USC) configurations
- Refineries and petrochemical plants — fired heaters, process heat exchangers, and steam generation systems
- Cogeneration and waste heat recovery — HRSG (heat recovery steam generator) piping systems
Seamless Boiler Pipe vs Welded Boiler Pipe
Most boiler pipe specifications mandate seamless manufacture for pressure-retaining service. Here is why:
| Characteristic | Seamless Boiler Pipe | ERW / Welded Boiler Pipe |
|---|---|---|
| Pressure rating | Higher — no weld seam weakness | Lower — weld seam is the weakest point |
| Temperature suitability | Up to 650°C+ (alloy grades) | Typically limited to lower temps |
| Standards | ASTM A106, A179, A192, A213, A335 | ASTM A53, API 5L |
| IBR approval | Required for all IBR-registered boilers | Generally not accepted for IBR service |
| Cost | Higher | Lower |
| Preferred use | Boiler drums, superheaters, main steam | Low-pressure utility piping only |
Amardeep Steel Centre supplies exclusively seamless boiler pipes for all high-pressure and IBR applications. ERW pipe is only quoted for low-pressure utility service where confirmed acceptable by the end-user specification.
Boiler Pipe Material Grade Selection Guide
Selecting the correct boiler pipe material depends on operating temperature, pressure class, and service environment. Use the table below to identify the right ASTM grade for your specification:
| ASTM Grade | Material Type | Max Service Temp | Pressure Class | Typical Application |
|---|---|---|---|---|
| ASTM A106 Gr. B | Seamless Carbon Steel | 480°C (900°F) | Medium-High | Steam lines, boiler feed, refineries |
| ASTM A179 | Seamless Cold-Drawn CS | 370°C (700°F) | Medium | Heat exchangers, condensers |
| ASTM A192 | Seamless High-Pressure CS | 480°C (900°F) | High | High-pressure steam boiler drums |
| ASTM A210 Gr. A1/C | Seamless Medium-CS | 455°C (850°F) | Medium-High | Boiler superheater, steam lines |
| ASTM A213 T11 | 1.25Cr-0.5Mo Alloy Steel | 593°C (1100°F) | High | Superheater, reheater tubes |
| ASTM A213 T22 | 2.25Cr-1Mo Alloy Steel | 649°C (1200°F) | High | Power station boilers, HRSG |
| ASTM A213 T91 | 9Cr-1Mo-V Alloy Steel | 650°C (1200°F) | Very High | Ultra-supercritical boilers |
| ASTM A335 P11 | 1.25Cr-0.5Mo Alloy Pipe | 593°C (1100°F) | High | High-temp steam headers |
| ASTM A335 P22 | 2.25Cr-1Mo Alloy Pipe | 649°C (1200°F) | High | Power plant steam piping |
| ASTM A335 P91 | 9Cr-1Mo-V Alloy Pipe | 650°C (1200°F) | Very High | Main steam lines, USC plants |
| BS 3059 Pt.2 Gr.360/440 | Carbon/Alloy Steel | 540°C (1004°F) | Medium-High | UK & export boiler packages |
| Not sure which grade suits your project? Send us your operating temperature, pressure, and medium — our technical team will confirm the correct boiler pipe specification within 24 hours. |
Boiler Pipe Specifications
| Parameter | Details |
|---|---|
| Boiler pipe size range | ½" NB to 24" NB (seamless); up to 36" NB welded |
| Outside diameter | 6 mm to 610 mm (custom OD available on request) |
| Wall thickness | 1 mm to 50 mm; SCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, all schedules |
| Length | Single Random, Double Random, 6m, 12m; cut-to-length available |
| Carbon steel standards | ASTM A/ASME SA 106 Gr. A,B,C | ASTM A179 | ASTM A192 | ASTM A/ASME SA 210 Gr. A1, C |
| Alloy steel standards | ASTM A/ASME SA 213 T2, T5, T9, T11, T12, T22, T91, T92 | ASTM A335 P1, P2, P5, P9, P11, P12, P22, P91, P92 |
| British standard | BS 3059 Part II Gr. 360, 440, 620 |
| German standard | DIN 17175 ST 35, ST 37, ST 45, ST 52; DIN 2391 |
| Japanese standard | JIS G3461 | JIS G3462 | JIS G3467 STFA 12/22/23/24/25/26 |
| Chinese standard | GB/T 5310, GB/T 3087, GB/T 9948 |
| IBR certification | Available on request — IBR Form III B issued for all IBR-applicable supplies |
| Manufacturing type | Seamless (hot rolled / cold drawn) | ERW | CDW | Welded / Fabricated |
| Form | Straight pipe | U-bend | Coiled | Pancake coil | Custom fabricated |
| End connections | Plain end (PE) | Bevelled end (BE) | Threaded | Flanged |
| Mill test certificate | EN 10204 3.1B | Lab test reports | Third-party inspection: SGS, BV, Lloyd's, TÜV |
Seamless Boiler Pipe OD and Wall Thickness
The table below covers the most frequently ordered seamless boiler pipe sizes. Sizes outside this range are available — contact us with your OD, wall thickness, and standard.
| NPS (in) | OD (in) | SCH 40 WT | SCH 80 WT | SCH 160 WT | SCH XXS WT |
|---|---|---|---|---|---|
| ½" | 0.840 | 0.109" | 0.147" | 0.187" | 0.294" |
| ¾" | 1.050 | 0.113" | 0.154" | 0.219" | 0.308" |
| 1" | 1.315 | 0.133" | 0.179" | 0.250" | 0.358" |
| 1½" | 1.900 | 0.145" | 0.200" | 0.281" | 0.400" |
| 2" | 2.375 | 0.154" | 0.218" | 0.344" | 0.436" |
| 3" | 3.500 | 0.216" | 0.300" | 0.438" | 0.600" |
| 4" | 4.500 | 0.237" | 0.337" | 0.531" | 0.674" |
| 6" | 6.625 | 0.280" | 0.432" | 0.719" | 0.864" |
| 8" | 8.625 | 0.322" | 0.500" | 0.906" | 0.875" |
| 10" | 10.750 | 0.365" | 0.594" | 1.125" | 1.000" |
| 12" | 12.750 | 0.406" | 0.688" | 1.312" | 1.000" |
Custom OD and wall thickness available on request. Metric sizes (mm OD × WT) supplied per DIN, EN, GB/T and JIS standards — state your standard when enquiring.
Boiler Pipe Dimensional Tolerances — ASTM A213 / ASME SA213
| Outside Diameter | OD Tolerance | WT Tolerance | Ovality Tolerance | Cut Length Tolerance |
|---|---|---|---|---|
| OD ≤ 12.7 mm | ± 0.13 mm | ± 15% | — | +3.18 mm / −0 mm |
| 12.7 mm < OD ≤ 38.1 mm | ± 0.13 mm | ± 10% | max. 1.65 mm | +3.18 mm / −0 mm |
| 38.1 mm < OD ≤ 88.9 mm | ± 0.25 mm | ± 10% | max. 2.41 mm | +4.76 mm / −0 mm |
Boiler Pipe Material Standards
Amardeep Steel Centre supplies seamless boiler pipes manufactured to the following internationally recognised standards:
| Standard | Description | Grades Covered |
|---|---|---|
| ASTM A106 / ASME SA106 | Seamless Carbon Steel Pipe for High-Temp Service | Gr. A, B, C |
| ASTM A179 / ASME SA179 | Seamless Cold-Drawn Low-Carbon Heat-Exchanger & Condenser Tubes | Single grade |
| ASTM A192 / ASME SA192 | Seamless Carbon Steel Boiler Pipe for High-Pressure | Single grade |
| ASTM A210 / ASME SA210 | Seamless Medium-Carbon Boiler Pipe & Superheater Tubes | Gr. A1, C |
| ASTM A213 / ASME SA213 | Seamless Ferritic/Austenitic Alloy-Steel Boiler Tubes | T2, T5, T9, T11, T12, T22, T91, T92 |
| ASTM A335 / ASME SA335 | Seamless Ferritic Alloy-Steel Pipe for High-Temp Service | P1, P5, P9, P11, P12, P22, P91, P92 |
| BS 3059 Part II | Steel Boiler and Superheater Tubes | Gr. 360, 440, 620 |
| DIN 17175 | Seamless Steel Pipes for Elevated Temperatures | ST 35, ST 37, ST 45, ST 52 |
| JIS G3461 / G3462 | Steel Tubes for Boilers and Heat Exchangers | STBA 12/13/20/22/23/24/25/26 |
| GB/T 5310 | Seamless Steel Pipe for High-Pressure Boilers (Chinese Std) | 20G, 12Cr1MoV, T91 |
| IBR (India Boiler Regs) | Indian Boiler Regulations — mandatory for India-registered boilers | All grades — Form III B available |
Testing & Quality Inspection
Every seamless boiler pipe supplied by Amardeep Steel Centre undergoes the following tests — results are documented in the Mill Test Certificate issued before despatch:
Chemical analysis: Carbon, Manganese, Phosphorus, Sulphur, Silicon, Chromium, Molybdenum, Vanadium (per grade)
Mechanical properties: Ultimate tensile strength, yield strength, elongation at break
Dimensional inspection: OD, wall thickness, ovality, straightness, end squareness
Technology tests: Flattening test, bend test, flaring test, ring tensile test
Hydrostatic test: Standard pressure limited to 20.7 MPa (3,000 psi) unless specified otherwise
Non-destructive examination: Ultrasonic test (UT), eddy current test, X-ray / radiographic test
Hardness test: Brinell or Rockwell hardness per applicable standard
Impact test: Charpy V-notch impact at specified temperatures (where required by standard)
Third-party inspection: SGS | Bureau Veritas (BV) | Lloyd's Register | TÜV | TPIA on request
Mill test certificate: EN 10204 3.1B | IBR Form III B available for India Boiler Regulation compliance
Why Choose Amardeep Steel Centre as Your Boiler Pipes Supplier?
All Indian power plant and boiler projects require IBR certification — we provide Form III B with every eligible supply
Ex-stock inventory from Mumbai warehouse — no minimum lead time for standard sizes in A106, A179, A192, T11, T22, P91
Full export documentation: test certs, packing lists, COO, MSDS — LC, TT, DP payment terms supported
Single-source supplier for ASTM, ASME, IBR, DIN, BS, JIS, and GB/T — no need to manage multiple vendors
Heat numbers, lot numbers, and mill certs traceable to each pipe — essential for EPC audits and power plant commissioning
All major TPI agencies accepted: SGS, BV, Lloyd's, TÜV — no additional lead time for TPI
U-bend, coiled, and cut-to-length boiler pipe available alongside straight lengths
Boiler Pipe Applications
- Main steam lines, reheater piping, superheater headers — specify A335 P91/P22 or A213 T91/T22
- Fired heater tubes, crude distillation unit heat exchangers, coker unit piping
- Steam cracker furnace tubes, ethylene plant piping, reactor feed preheat systems
- Heat recovery steam generator evaporator and superheater circuits
- Low-pressure clean steam generation — carbon steel A106 Gr. B
- Marine boiler pipes to DNV, Lloyd's, BV classification society specifications
- Economiser tubes, waste heat boiler circuits in cement and steel plants
- High-temperature hot water distribution pipework — carbon steel and low-alloy grades
Types of Boiler Pipes We Supply
- Straight seamless boiler pipe — standard 6m and 12m lengths, all grades
- U-bend boiler pipe — cold or hot bent, min. bend radius per ASME B16.49
- Coiled boiler pipe — pancake and helical coil for compact heat exchanger applications
- High-pressure boiler pipe — A192, A335 P91/P22, A213 T91/T22 for supercritical service
- IBR boiler pipe — supplied with Indian Boiler Regulation Form III B, stamped and traceable
- Superheater and reheater pipe — Cr-Mo grades T11, T22, T91, P11, P22, P91 for high-temperature steam service
- Cold-drawn seamless boiler pipe — precision OD tolerance for heat exchanger tube bundles
- Stainless steel boiler pipe — TP304H, TP316H, TP321H for austenitic high-temperature service
Related Boiler Products
- Boiler Tubes
- ASTM A179 Tube
- ASTM A192 Tubes
- ASTM A210 Tube
- Carbon Steel Pipes & Tubes
- ASTM A53 Tubes
Boiler pipes and boiler tubes are different products. Boiler pipes (ASTM A106, A335) are typically larger-diameter items used for steam headers and main pipework. Boiler tubes (ASTM A179, A192, A213) are small-bore seamless tubes used inside the boiler for heat transfer. We supply both — see links above.
Related Reading & Products
- Boiler Tube Material Specification — ASTM Grades, Standards & Selection Guide
- What are Boiler Tubes and How are They Made? — Manufacturing Process Guide
- Boiler Pipes Supplier — BS 3059, ASTM A106, IBR Certified
Request a Quote for Seamless Boiler Pipes
To receive a quotation, please share the following information with our team:
- Grade/standard (e.g. ASTM A106 Gr. B, A335 P91, A213 T22)
- Size: OD or NPS × Wall Thickness or Schedule
- Quantity (metres / kg / number of pipes)
- Any special requirements: IBR, third-party inspection, NDE, heat treatment
Frequently Asked Questions — Boiler Tubes
What is a boiler pipe?
A boiler pipe is a seamless steel pipe designed to carry steam, hot water, or hot gas under elevated pressure and temperature conditions inside a boiler system. Boiler pipes must meet strict mechanical property requirements — tensile strength, yield strength, creep resistance, and impact toughness — tested and certified at the mill. The most common boiler pipe specifications are ASTM A106 (carbon steel), ASTM A335 (alloy steel for high-temperature service), and ASTM A213 (alloy steel tubes for superheater and reheater circuits).
What is seamless boiler pipe?
Seamless boiler pipe is manufactured without a longitudinal weld seam, using either hot rolling or cold drawing processes. The absence of a weld line means there is no weakest point in the pipe wall — making seamless construction the standard for all pressure-retaining boiler pipe applications. Under IBR (Indian Boiler Regulations) and most international standards, seamless pipe is mandatory for boiler drum and superheater piping service.
What are the standard boiler pipe specifications?
The most widely used boiler pipe specifications are: ASTM A106 Gr. B (seamless carbon steel, up to 480°C); ASTM A179 (seamless cold-drawn CS, heat exchangers); ASTM A192 (high-pressure seamless CS boiler pipe); ASTM A335 P11/P22/P91 (alloy steel for high-temperature steam piping); ASTM A213 T11/T22/T91 (alloy steel superheater tubes); and BS 3059 Part II (UK standard for boiler steel tubes). IBR-certified versions of all ASTM grades are available from Amardeep Steel Centre.
What is boiler pipe material?
Boiler pipe material is selected based on operating temperature and pressure. For temperatures up to 480°C, carbon steel grades (ASTM A106 Gr. B, A192) are used. For 480–649°C, low-alloy Cr-Mo grades (A335 P11, P22; A213 T11, T22) are specified. For 649°C and above — supercritical and ultra-supercritical service — Grade P91 or T91 (9Cr-1Mo-V) is the standard material. Stainless steel grades (TP304H, TP321H) are used where corrosion resistance is the primary concern alongside temperature.
What is the difference between boiler pipe and boiler tube?
Boiler pipes are larger-diameter seamless items (½" to 24" NB) used for steam headers, main pipework, and distribution systems — governed by ASTM A106 and A335. Boiler tubes are small-bore seamless items (typically under 2" OD) used inside the boiler for heat transfer — the actual tubing that water or steam flows through within the boiler pressure vessel — governed by ASTM A179, A192, A210, and A213. Both are manufactured to strict pressure ratings but serve distinct functions in the boiler system.
Do you supply IBR-approved boiler pipes?
Yes. Amardeep Steel Centre supplies IBR-certified seamless boiler pipes with Indian Boiler Regulation Form III B for all applicable grades. IBR certification is mandatory for all boiler pressure parts used in Indian-registered boilers. Contact our sales team with your IBR registration number and we will ensure full certification compliance is in place before despatch.
What countries do you export boiler pipes to?
We export seamless boiler pipes to 100+ countries across the Middle East (UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain), Southeast Asia (Singapore, Malaysia, Indonesia, Vietnam, Thailand), Europe (UK, Germany, France, Netherlands, Italy, Spain), Africa (Nigeria, South Africa, Kenya, Algeria), and the Americas (USA, Canada, Brazil, Mexico). Full export documentation is provided including EN 10204 3.1B MTCs, COO, packing lists, and MSDS.
