Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
9% Chromium – 1% Molybdenum seamless alloy steel tubes for refinery furnace coils, heat exchangers and high-temperature oxidising service.
Tubewell Steel & Engg. Co. manufactures, stocks and supplies ASTM A213 T9 tubes, a 9Cr-1Mo ferritic alloy steel. T9 has the highest chromium of the conventional chrome-moly grades, giving excellent resistance to oxidation, sulphidation and hydrogen attack. That makes it a standard choice for refinery furnace tubes and high-temperature exchanger bundles.
Why A213 T9 is specified for the hottest refinery duties
ASTM A213 T9 is a seamless ferritic alloy steel tube containing 8.00–10.00% chromium and 0.90–1.10% molybdenum, with 0.25–1.00% silicon. The high chromium forms a dense, adherent oxide scale that resists high-temperature oxidation and sulphidic corrosion far better than the low-chrome grades. The 1% molybdenum gives good creep resistance, so T9 holds up in furnace coils running at metal temperatures of about 650°C.
Our T9 tubes are hot finished or cold drawn and are full or isothermal annealed, or normalized and tempered at a minimum of 675°C (1250°F), as permitted by A213. Every tube is marked for full traceability. Lots ship with EN 10204 3.1 test certificates, and IBR Form III-A, NACE MR0103 compliance and third-party inspection can be provided on request.
Standard supply range for ASTM A213 T9 tubes
| Parameter | Details |
|---|---|
| Standard | ASTM A213, ASME SA213 |
| General Requirements | ASTM A1016 / A1016M |
| Grade | T9 (UNS K90941) |
| 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, Coiled |
| 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 T9
| Standard | ASTM | UNS | EN | DIN / W.Nr. | JIS | BS |
|---|---|---|---|---|---|---|
| T9 | A213 T9 | K90941 | X11CrMo9-1 | 1.7386 | STBA 26 | 3059 629-470 |
Weight %, as per ASTM A213
| Grade | C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| A213 T9 | 0.15 max | 0.30 – 0.60 | 0.025 max | 0.025 max | 0.25 – 1.00 | 8.00 – 10.00 | 0.90 – 1.10 |
Minimum values at room temperature, as per ASTM A213
| Grade | Tensile Strength | Yield Strength (0.2%) | Elongation in 2" | Hardness (max) |
|---|---|---|---|---|
| A213 T9 | 415 MPa (60 ksi) min | 205 MPa (30 ksi) min | 30% min | 163 HBW / 85 HRB |
Typical values (for reference)
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.70 g/cm³ | 0.278 lb/in³ |
| Melting Range | 1450 – 1500 °C | 2640 – 2730 °F |
| Modulus of Elasticity | 205 GPa | 29.7 × 10³ ksi |
| Thermal Conductivity (100°C) | 26 W/m·K | 15.0 BTU/h·ft·°F |
| Mean Thermal Expansion (20–300°C) | 11.2 µm/m·°C | 6.2 µin/in·°F |
| Specific Heat | 0.46 J/g·°C | 0.11 BTU/lb·°F |
| Max. Service Temperature | ≈ 650 °C | ≈ 1200 °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 T9 tubes are used
Radiant coils in crude, vacuum and coker heaters.
Hydroprocessing and catalytic reforming units with hot hydrogen.
Process heater and transfer-line tubing at elevated temperature.
High-temperature exchanger bundles in sulphur-bearing streams.
Superheater sections exposed to aggressive flue gas.
Reformer and waste heat tubing where hydrogen attack is a concern.
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 T9 tubes
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