Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
5% Chromium – 0.5% Molybdenum seamless alloy steel tubes for refinery heaters, boilers and sulphur-bearing high-temperature service.
Tubewell Steel & Engg. Co. manufactures, stocks and supplies ASTM A213 T5 tubes, a 5Cr-½Mo ferritic alloy steel for refinery and boiler service. Its higher chromium gives better resistance to sulphidation and high-temperature oxidation than the low-chrome grades, so T5 is widely used for fired heater coils and crude unit tubing.
Why A213 T5 is chosen for sulphur-rich, high-temperature service
ASTM A213 T5 is a seamless ferritic alloy steel tube containing 4.00–6.00% chromium and 0.45–0.65% molybdenum. Its chromium content is well above that of the low-chrome grades, giving a protective oxide layer that resists high-temperature sulphidation from sulphur-bearing crude and oxidation at metal temperatures up to about 650°C. Molybdenum adds creep and rupture strength, so T5 holds its strength under sustained heat and pressure.
We supply T5 tubes hot finished or cold drawn, heat treated by full or isothermal annealing, or by normalizing and tempering at a minimum of 675°C (1250°F). Each tube is identified with heat number, grade and size. Lots are documented 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 T5 tubes
| Parameter | Details |
|---|---|
| Standard | ASTM A213, ASME SA213 |
| General Requirements | ASTM A1016 / A1016M |
| Grade | T5 (UNS K41545) |
| 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 T5
| Standard | ASTM | UNS | EN | DIN / W.Nr. | JIS | BS |
|---|---|---|---|---|---|---|
| T5 | A213 T5 | K41545 | X11CrMo5 | 1.7362 | STBA 25 | 3604 HFS 625 |
Weight %, as per ASTM A213
| Grade | C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| A213 T5 | 0.15 max | 0.30 – 0.60 | 0.025 max | 0.025 max | 0.50 max | 4.00 – 6.00 | 0.45 – 0.65 |
Minimum values at room temperature, as per ASTM A213
| Grade | Tensile Strength | Yield Strength (0.2%) | Elongation in 2" | Hardness (max) |
|---|---|---|---|---|
| A213 T5 | 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 – 1500 °C | 2640 – 2730 °F |
| Modulus of Elasticity | 205 GPa | 29.7 × 10³ ksi |
| Thermal Conductivity (100°C) | 30 W/m·K | 17.3 BTU/h·ft·°F |
| Mean Thermal Expansion (20–300°C) | 11.8 µm/m·°C | 6.6 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 T5 tubes are used
Radiant and convection coils in crude and vacuum unit heaters.
Delayed coker, visbreaker and hydrocracker tubing in sour service.
Process heaters and exchangers handling hot hydrocarbons.
Superheater sections where oxidation resistance is critical.
High-temperature exchanger bundles in sulphur-bearing streams.
Sulphur recovery and hot gas service tubing.
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 T5 tubes
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