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Seamless Tubes for Boiler Air-Preheaters (APH), Heat Recovery Units & Power Plant Air Systems
Inox Steel India is a trusted manufacturer and global supplier of Air Heater Tubes complying with ASTM A213 (alloy steel, stainless steel) and ASTM A209 (carbon-molybdenum steel). These tubes are specially designed for air preheaters (APH), economizer units, regenerative heaters, and heat recovery systems in thermal power plants, boilers, refineries, and industrial process heating systems.
Air heater tubes operate under harsh service conditions:
For this reason, materials used must offer high-temperature strength, oxidation resistance, abrasion resistance, and long lifecycle. Our tubes are manufactured as: Cold Drawn Seamless (CDS), Hot-Finished Seamless (HFS), and Fin Tubes (integral/externally finned, on request). And supplied with heat treatment like: Normalizing, Stress-relieving, Solution annealing, and Tempering.
Air heater tubes must withstand hot air, flue gas, coal/ash particles, acidic condensates, and continuous thermal cycling. ASTM A209 & A213 are the preferred global standards for this service.
Common grades:
These are widely used in APH lower-temperature zones and coal-fired boilers.
Common grades:
Air Heater Tubes (APH Tubes) operate inside boiler air-preheater units, exposed to hot air, flue gas, soot, ash, acidic condensate, and continuous thermal cycling. These tubes must resist erosion, high temperature, oxidation, corrosion, and pressure fluctuations.
🔹 ASTM A209 (C-Mo Alloy Tubes)
| Grade | Temperature | Application | Industry |
|---|---|---|---|
| T1 / T1a | Medium | Tubular air preheater coils · APH cold-end & mid zones · Steam-to-air heat exchangers · Hot gas recirculation | Thermal Power · Biomass Boilers · Sugar Mills · Cement Plants |
Why A209? Good tensile strength + oxidation resistance for medium air heater zones.
🔹 ASTM A213 Ferritic Alloy Steel (T11 / T22)
| Grade | Temperature | Applications | Industry |
|---|---|---|---|
| T11 / T22 | High | APH hot-end · Flue gas heat exchangers · Soot blower-exposed tubes · Regenerative air heater sections | Thermal Power · Petrochemical · Steel Plants · Boilers |
Why T11/T22? Better creep resistance + higher oxidation resistance.
🔹 ASTM A213 High-Temp Alloys (T91 / T92)
| Grade | Strength | Application |
|---|---|---|
| T91 / T92 | Very High | APH high-heat zones, HRSG units, turbine HR circuits |
Why T91/T92? Exceptional high-temp fatigue resistance + long life under thermal stress.
🔹 ASTM A213 Stainless Steel (TP304H / TP347H)
| Grade | Property | Application |
|---|---|---|
| TP304H / TP347H | High heat + corrosion resistance | Upper APH coils, chemical heaters |
Why stainless? Superior corrosion resistance against sulfur, chloride, acidic condensates.
| Standard | Grade | Price (INR/kg) | Price (USD/kg) | Typical Use |
| ASTM A209 | T1 / T1a | ₹110 – ₹165 | $1.40 – $2.20 | Mid APH zones |
| ASTM A213 | T11 / T22 | ₹135 – ₹195 | $1.70 – $2.60 | Hot-end tubes |
| ASTM A213 | T91 / T92 | ₹180 – ₹300 | $2.20 – $3.90 | Supercritical APH |
| ASTM A213 | TP304H / TP347H | ₹280 – ₹550 | $3.50 – $7.00 | Corrosion-critical zones |
Prices depend on OD, WT, length, heat treatment, and TPI requirements.
Mechanical Tests
Non-Destructive Tests
High-Temp Tests
Corrosion & Surface
TPI Available: SGS · TÜV · BV · DNV · Intertek.
Inox Steel India is a trusted manufacturer and stockist of Air Heater Tubes (APH Tubes) near Alankar Cinema, Mumbai, supplying ASTM A213 (Alloy & Stainless Steel) and ASTM A209 (Carbon-Molybdenum) tubes to power plants, boiler manufacturers, EPC contractors, refineries, steel plants, sugar mills, and chemical processing units.
Our APH tubes are engineered for: High-temperature flue gas exposure, Erosion from soot/ash particles, Corrosion caused by sulfur & acidic condensate, Continuous thermal cycling, Abrasion from soot blowers, and Long service life in boiler air preheater units. We supply straight tubes, oval tubes, and finned tubes suitable for regenerative (Ljungström) and tubular air-preheater systems.
| Industry | Applications |
| Thermal Power Plants | Air Preheaters · Regenerative APH Units |
| Boiler Manufacturing | Tubular air heater coils |
| Refineries & Petrochemicals | Flue gas heat exchangers |
| Steel & Cement Plants | Waste heat recovery air heaters |
| Sugar Mills | Bagasse-fired boiler APH tubes |
| Paper & Pulp Plants | Steam-to-air heating systems |
Air Heater Tubes require careful protection from corrosion, mechanical stress, and surface deterioration.
Packaging Includes
Marking & Shipping
Need high-temperature Air Heater Tubes for boilers, power plants, or HRSG units? Talk to our technical sales team today.
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
alloy@inoxsteelindia.in, steel@inoxsteelindia.in
+91 9930796690
A209: Carbon-molybdenum tubes → medium temperature resistance A213: Alloy/SS tubes → high & very high temperature + corrosion resistance T11, T22, T91, T92 depending on the operating temperature and boiler type. Yes — integral & external fin tubes available on request. Yes — designed for ash, soot, abrasion, and corrosive gases. Yes — SGS, TUV, BV, DNV, and Intertek approved. Q2. What is the difference between ASTM A209 and ASTM A213?
Which grade is best for high-temperature APH zones?
Do you supply fins on air heater tubes?
Are these tubes suitable for coal-fired boilers?
Can you export APH tubes with TPI inspection?
Inox Steel India supplies Air Heater Tubes as per ASTM A213 (T11, T22, T91, TP304H) and ASTM A209 (T1/T1a). Ideal for boiler air preheaters, flue gas heaters, HRSG units, and hot air systems. Exporter to GCC, Europe, Africa & USA.