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Seamless Tubes for Boiler Air-Preheaters (APH), Heat Recovery Units & Power Plant Air Systems
Inox Steel India
Inox Steel India is a trusted manufacturer and global supplier of Air Heater Tubes complying with ASTM A213 and ASTM A209.
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:
And supplied with heat treatment like:
Air heater tubes must withstand hot air, flue gas, coal/ash particles, acidic condensates, and continuous thermal cycling.
ASTM A209 & ASTM A213 are the preferred global standards for this service.
Designed for:
Common grades:
These are widely used in APH lower-temperature zones and coal-fired boilers.
Designed for:
Common grades:
A213 grades are preferred in aggressive flue gas zones, upper sections, and where long-term oxidation resistance is required.
1. Seamless Tube Formation (CDS / HFS)
High structural integrity for fluctuating temperatures.
2. Heat Treatment
Normalized · Normalized & tempered · Solution annealed
3. OD/ID Finishing & Straightening
Ensures uniform airflow and minimal pressure drop.
4. Surface Conditioning
Anti-corrosion oil · Paint-coated (optional) · Finned options
5. NDT Testing
Eddy current, ultrasonic, hydrotest for leak-free performance.
| Grade | Temperature | Application | Industry |
| T1 / T1a | Medium | Tubular air preheater coils | Thermal Power |
| T1 / T1a | Medium | APH cold-end & mid zones | Biomass Boilers |
| T1 / T1a | Medium | Steam-to-air heat exchangers | Sugar Mills |
| T1 / T1a | Medium | Hot gas recirculation | Cement Plants |
| Grade | Temperature | Application | Industry |
| T11 / T22 | High | APH hot-end | Thermal Power |
| T11 / T22 | High | Flue gas heat exchangers | Petrochemical |
| T11 / T22 | High | Soot blower-exposed tubes | Steel Plants |
| T11 / T22 | High | Regenerative air heater sections | Boilers |
| 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 zones |
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?