Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
1.25% Chromium – 0.5% Molybdenum seamless alloy steel tubes for boilers, superheaters and heat exchangers in steam service.
Tubewell Steel & Engg. Co. manufactures, stocks and supplies ASTM A213 T11 tubes, a 1¼Cr-½Mo-Si ferritic alloy steel for elevated-temperature service. T11 combines good creep strength, oxidation resistance and easy weldability, which makes it one of the most widely used grades for superheaters, reheaters and heat exchangers.
Why A213 T11 is the workhorse grade for boiler and superheater tubes
ASTM A213 T11 is a seamless ferritic alloy steel tube with 1.00–1.50% chromium, 0.44–0.65% molybdenum and 0.50–1.00% silicon. Chromium and the higher silicon improve resistance to steam-side oxidation and fire-side scaling, while molybdenum raises creep and rupture strength. As a result, T11 tubes perform reliably at metal temperatures up to about 595°C (1100°F) in boilers and heat exchangers.
Our T11 tubes are hot finished or cold drawn and are full or isothermal annealed, or normalized and tempered at a minimum of 650°C (1200°F), as required by A213. Each tube carries its heat number, grade and size. Lots ship with EN 10204 3.1 mill test 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 T11 tubes
| Parameter | Details |
|---|---|
| Standard | ASTM A213, ASME SA213 |
| General Requirements | ASTM A1016 / A1016M |
| Grade | T11 (UNS K11597) |
| 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. 650°C / 1200°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 T11
| Standard | ASTM | UNS | EN | DIN / W.Nr. | JIS | BS |
|---|---|---|---|---|---|---|
| T11 | A213 T11 | K11597 | 13CrMo4-5 | 1.7335 | STBA 23 | 3604 HFS 621 |
Weight %, as per ASTM A213
| Grade | C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| A213 T11 | 0.05 – 0.15 | 0.30 – 0.60 | 0.025 max | 0.025 max | 0.50 – 1.00 | 1.00 – 1.50 | 0.44 – 0.65 |
Minimum values at room temperature, as per ASTM A213
| Grade | Tensile Strength | Yield Strength (0.2%) | Elongation in 2" | Hardness (max) |
|---|---|---|---|---|
| A213 T11 | 415 MPa (60 ksi) min | 205 MPa (30 ksi) min | 30% min | 163 HBW / 85 HRB |
Typical values (for reference)
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.75 g/cm³ | 0.280 lb/in³ |
| Melting Range | 1450 – 1510 °C | 2640 – 2750 °F |
| Modulus of Elasticity | 205 GPa | 29.7 × 10³ ksi |
| Thermal Conductivity (100°C) | 37 W/m·K | 21.4 BTU/h·ft·°F |
| Mean Thermal Expansion (20–300°C) | 12.4 µm/m·°C | 6.9 µin/in·°F |
| Specific Heat | 0.46 J/g·°C | 0.11 BTU/lb·°F |
| Max. Service Temperature | ≈ 595 °C | ≈ 1100 °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 T11 tubes are used
Primary and secondary superheater coils in utility boilers.
Reheater and waterwall panels in industrial and utility boilers.
Superheater and evaporator modules in heat recovery steam generators.
High-temperature shell-and-tube exchangers and feedwater heaters.
Process heater coils and hydrotreater exchanger bundles.
Ammonia plant waste heat boilers and steam 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
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