Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
1% Chromium – 0.5% Molybdenum seamless alloy steel tubes for economisers, waterwalls, low-temperature superheaters and heat exchangers.
Tubewell Steel & Engg. Co. manufactures, stocks and supplies ASTM A213 T12 tubes, a 1Cr-½Mo ferritic alloy steel. T12 is an economical, easy-to-weld boiler tube grade that offers better creep strength than carbon steel. It is used for economisers, waterwall panels, low-temperature superheaters and heat exchangers.
A cost-effective chrome-moly tube for moderate-temperature boiler service
ASTM A213 T12 is a seamless ferritic alloy steel tube containing 0.80–1.25% chromium and 0.44–0.65% molybdenum, with silicon limited to 0.50% max. Molybdenum gives T12 much higher creep and stress-rupture strength than carbon steel boiler tubes. Chromium improves oxidation resistance and protects against graphitisation during long service, so T12 is suitable for metal temperatures up to about 565°C (1050°F).
Our T12 tubes are hot finished or cold drawn and supplied full or isothermal annealed, normalized and tempered (temper min. 650°C / 1200°F), or subcritically annealed, as permitted by A213. Each tube is marked for heat-wise traceability. Lots ship with EN 10204 3.1 mill test certificates, and IBR Form III-A and third-party inspection are available on request.
Standard supply range for ASTM A213 T12 tubes
| Parameter | Details |
|---|---|
| Standard | ASTM A213, ASME SA213 |
| General Requirements | ASTM A1016 / A1016M |
| Grade | T12 (UNS K11562) |
| 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, Normalized & Tempered (temper min. 650°C / 1200°F) or Subcritical Annealed |
| 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 T12
| Standard | ASTM | UNS | EN | DIN / W.Nr. | JIS | BS |
|---|---|---|---|---|---|---|
| T12 | A213 T12 | K11562 | 13CrMo4-5 | 1.7335 | STBA 22 | 3059 620-460 |
Weight %, as per ASTM A213
| Grade | C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| A213 T12 | 0.05 – 0.15 | 0.30 – 0.61 | 0.025 max | 0.025 max | 0.50 max | 0.80 – 1.25 | 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 T12 | 415 MPa (60 ksi) min | 205 MPa (30 ksi) min | 30% min | 163 HBW / 85 HRB |
Typical values (for reference)
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Melting Range | 1450 – 1510 °C | 2640 – 2750 °F |
| Modulus of Elasticity | 205 GPa | 29.7 × 10³ ksi |
| Thermal Conductivity (100°C) | 38 W/m·K | 22.0 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 | ≈ 565 °C | ≈ 1050 °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 T12 tubes are used
Economiser and low-temperature superheater coils in utility boilers.
Furnace waterwall and membrane panels in industrial boilers.
Evaporator and economiser sections in heat recovery steam generators.
Feedwater heaters and moderate-temperature exchanger bundles.
Sugar, paper and textile industry boilers with IBR certification.
Convection section coils and process heater tubes.
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 T12 tubes
Get competitive pricing, ready stock and complete documentation.
