Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
2.25% Chromium – 1% Molybdenum seamless alloy steel tubes with high creep strength for superheaters, reheaters and high-pressure boilers.
Tubewell Steel & Engg. Co. manufactures, stocks and supplies ASTM A213 T22 tubes, a 2¼Cr-1Mo ferritic alloy steel. T22 has higher creep and rupture strength than T11 and T12, making it a standard choice for final superheaters, reheaters and high-pressure boiler tubing operating at sustained high temperature.
Why A213 T22 is specified for hotter superheater and reheater sections
ASTM A213 T22 is a seamless ferritic alloy steel tube containing 1.90–2.60% chromium and 0.87–1.13% molybdenum. Doubling the molybdenum relative to T11 and T12 gives a substantial gain in long-term creep and stress-rupture strength. The higher chromium improves resistance to steam-side oxidation and fire-side corrosion. T22 tubes are routinely used at metal temperatures up to about 600°C (1110°F).
Our T22 tubes are hot finished or cold drawn and supplied full or isothermal annealed, or normalized and tempered at a minimum of 675°C (1250°F), as required by A213. Each tube is marked with heat number, grade and size for complete traceability. Lots ship with EN 10204 3.1 certificates, and IBR Form III-A and third-party inspection by BV, TÜV, SGS or Lloyd's are available.
Standard supply range for ASTM A213 T22 tubes
| Parameter | Details |
|---|---|
| Standard | ASTM A213, ASME SA213 |
| General Requirements | ASTM A1016 / A1016M |
| Grade | T22 (UNS K21590) |
| Type | Seamless – Hot Finished / Cold Drawn |
| Outside Diameter | 12.7 mm to 101.6 mm (1/2" – 4"); larger ODs on request |
| Wall Thickness | 1.65 mm to 12.7 mm (16 BWG – 1/2"), average or minimum wall |
| Length | Single Random, Double Random, Cut Length (up to 18 m) |
| Form | Straight, U-Bent, Serpentine Coils |
| Ends | Plain End, Bevelled End |
| Heat Treatment | Full / Isothermal Annealed or Normalized & Tempered (temper min. 675°C / 1250°F) |
| Surface | Black Painted, Varnished, Anti-rust Oil, Pickled |
| Testing | Hydrostatic or Eddy Current, Ultrasonic, Flattening, Flaring, Hardness, Tensile, PMI |
| Certificates | EN 10204 3.1 / 3.2, IBR Form III-A, TPI Reports |
International equivalents of A213 T22
| Standard | ASTM | UNS | EN | DIN / W.Nr. | JIS | BS |
|---|---|---|---|---|---|---|
| T22 | A213 T22 | K21590 | 10CrMo9-10 | 1.7380 | STBA 24 | 3059 622-490 |
Weight %, as per ASTM A213
| Grade | C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| A213 T22 | 0.05 – 0.15 | 0.30 – 0.60 | 0.025 max | 0.025 max | 0.50 max | 1.90 – 2.60 | 0.87 – 1.13 |
Minimum values at room temperature, as per ASTM A213
| Grade | Tensile Strength | Yield Strength (0.2%) | Elongation in 2" | Hardness (max) |
|---|---|---|---|---|
| A213 T22 | 415 MPa (60 ksi) min | 205 MPa (30 ksi) min | 30% min | 163 HBW / 85 HRB |
Typical values (for reference)
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.83 g/cm³ | 0.283 lb/in³ |
| Melting Range | 1450 – 1510 °C | 2640 – 2750 °F |
| Modulus of Elasticity | 206 GPa | 29.9 × 10³ ksi |
| Thermal Conductivity (100°C) | 36 W/m·K | 20.8 BTU/h·ft·°F |
| Mean Thermal Expansion (20–300°C) | 12.5 µm/m·°C | 6.9 µin/in·°F |
| Specific Heat | 0.46 J/g·°C | 0.11 BTU/lb·°F |
| Max. Service Temperature | ≈ 600 °C | ≈ 1110 °F |
Tube OD vs wall thickness (BWG / mm) – weight in kg/m
| OD (inch) | OD (mm) | 16 BWG (1.65) | 14 BWG (2.11) | 12 BWG (2.77) | 10 BWG (3.40) | 8 BWG (4.19) |
|---|---|---|---|---|---|---|
| 1/2" | 12.70 | 0.45 | 0.55 | 0.68 | 0.78 | – |
| 5/8" | 15.88 | 0.58 | 0.72 | 0.90 | 1.05 | – |
| 3/4" | 19.05 | 0.71 | 0.88 | 1.11 | 1.31 | 1.54 |
| 1" | 25.40 | 0.97 | 1.21 | 1.55 | 1.84 | 2.19 |
| 1 1/4" | 31.75 | 1.22 | 1.54 | 1.98 | 2.38 | 2.85 |
| 1 1/2" | 38.10 | 1.48 | 1.87 | 2.41 | 2.91 | 3.50 |
| 1 3/4" | 44.45 | 1.74 | 2.20 | 2.85 | 3.44 | 4.16 |
| 2" | 50.80 | 2.00 | 2.53 | 3.28 | 3.97 | 4.82 |
| 2 1/2" | 63.50 | 2.52 | 3.19 | 4.15 | 5.04 | 6.13 |
| 3" | 76.20 | 3.03 | 3.86 | 5.02 | 6.10 | 7.44 |
| 3 1/2" | 88.90 | 3.55 | 4.52 | 5.88 | 7.17 | 8.75 |
| 4" | 101.60 | 4.07 | 5.18 | 6.75 | 8.23 | 10.06 |
Column headings show BWG gauge with wall thickness in mm; values are weight in kg/m, calculated as (OD − WT) × WT × 0.02466. Values are nominal; actual weights may vary within ASTM A1016 tolerances.
Where ASTM A213 T22 tubes are used
Final superheater and reheater coils in subcritical utility boilers.
Waterwall, roof and penthouse tubing exposed to high heat flux.
HP superheater and reheater modules in combined-cycle plants.
Hydrocracker and hydrotreater exchangers in hot hydrogen service.
High-temperature, high-pressure shell-and-tube exchangers.
Ammonia synthesis loop waste heat boilers and superheaters.
Quality you can verify on every heat
Large inventory for fast dispatch
MTC EN 10204 3.1 / 3.2
Positive material identification
Pan-India & export shipping
Quick answers about A213 T22 tubes
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