Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
Seamless chrome-moly straight, U-bent and finned tubes for shell-and-tube exchangers, feedwater heaters, condensers and air coolers.
Tubewell Steel & Engg. Co. manufactures, stocks and supplies seamless alloy steel heat exchanger tubes to ASTM A213 / ASME SA213, and to the legacy A199 specification where required. Tubes are available in grades T5, T9, T11, T22 and T91, supplied straight, U-bent to your bundle drawing, or finned for air coolers and economisers.
Chrome-moly tubes engineered for efficient heat transfer at high temperature
Alloy steel heat exchanger tubes are used where process temperature, hydrogen partial pressure or sulphur content rule out carbon steel. Chrome-moly grades keep their strength at elevated temperature and resist hydrogen attack, sulphidation and oxidation, while staying ferritic for good thermal conductivity and low thermal expansion. T11 and T22 are widely used in hydrotreater and reformer exchangers, T5 and T9 in sulphur-bearing refinery streams, and T91 in the most demanding high-temperature duties.
We supply tubes to ASTM A213 / ASME SA213, the current specification for alloy steel heat exchanger tubes, and to ASTM A199 for replacement bundles in older equipment designed to it. Tubes can be supplied cut to exact length, U-bent to TEMA tolerances (with bend-area stress relieving and post-bend hydrotesting when specified), or fitted with high-frequency welded solid or serrated fins. Every tube is traceable to its heat and supplied with EN 10204 3.1 certificates.
Standard supply range for alloy steel heat exchanger tubes
| Parameter | Details |
|---|---|
| Standard | ASTM A213 / ASME SA213; ASTM A199 (legacy) |
| General Requirements | ASTM A1016 / A1016M |
| Grades | T5, T9, T11, T12, T22, T91 |
| Type | Seamless – Cold Drawn / Hot Finished |
| Outside Diameter | 12.7 mm to 101.6 mm (1/2" – 4"); 5/8", 3/4" & 1" most common |
| Wall Thickness | 1.24 mm to 4.19 mm (18 BWG – 8 BWG); heavier on request |
| Length | Exact Cut Lengths up to 18 m |
| U-Bending | Bends to TEMA / customer drawing; bend-area stress relieving where specified |
| Finned Tubes | High-frequency welded solid / serrated fins, carbon steel or alloy fin material |
| Heat Treatment | As per A213 – Annealed or Normalized & Tempered |
| Surface | Pickled & Oiled, Varnished, Shot Blasted |
| Testing | Hydrostatic or Eddy Current, Ultrasonic, Flattening, Flaring, Hardness, Post-bend Hydrotest |
| Certificates | EN 10204 3.1 / 3.2, TPI Reports, IBR on request |
International equivalents of heat exchanger tube grades
| Grade | ASTM | UNS | EN | DIN / W.Nr. | JIS | BS |
|---|---|---|---|---|---|---|
| T5 | A213 / A199 T5 | K41545 | X11CrMo5 | 1.7362 | STBA 25 | 3604 HFS 625 |
| T9 | A213 / A199 T9 | K90941 | X11CrMo9-1 | 1.7386 | STBA 26 | 3059 629-470 |
| T11 | A213 / A199 T11 | K11597 | 13CrMo4-5 | 1.7335 | STBA 23 | 3604 HFS 621 |
| T22 | A213 / A199 T22 | K21590 | 10CrMo9-10 | 1.7380 | STBA 24 | 3059 622-490 |
| T91 | A213 T91 | K90901 | X10CrMoVNb9-1 | 1.4903 | STBA 28 | – |
Weight %, as per ASTM A213
| Grade | C | Mn | P | S | Si | Cr | Mo | Others |
|---|---|---|---|---|---|---|---|---|
| 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 | – |
| 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 | – |
| 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 | – |
| 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 | – |
| T91 | 0.07 – 0.14 | 0.30 – 0.60 | 0.020 max | 0.010 max | 0.20 – 0.50 | 8.00 – 9.50 | 0.85 – 1.05 | V 0.18–0.25, Nb 0.06–0.10, N 0.030–0.070, Ni 0.40 max |
Minimum values at room temperature, as per ASTM A213
| Grade | Tensile Strength | Yield Strength (0.2%) | Elongation in 2" | Hardness (max) |
|---|---|---|---|---|
| T5 | 415 MPa (60 ksi) min | 205 MPa (30 ksi) min | 30% min | 163 HBW / 85 HRB |
| T9 | 415 MPa (60 ksi) min | 205 MPa (30 ksi) min | 30% min | 163 HBW / 85 HRB |
| T11 | 415 MPa (60 ksi) min | 205 MPa (30 ksi) min | 30% min | 163 HBW / 85 HRB |
| T22 | 415 MPa (60 ksi) min | 205 MPa (30 ksi) min | 30% min | 163 HBW / 85 HRB |
| T91 | 585 MPa (85 ksi) min | 415 MPa (60 ksi) min | 20% min | 250 HBW / 25 HRC |
Typical values (for reference)
| Property | T11 | T22 | T5 | T9 | T91 |
|---|---|---|---|---|---|
| Density (g/cm³) | 7.75 | 7.83 | 7.75 | 7.70 | 7.77 |
| Modulus of Elasticity (GPa) | 205 | 206 | 205 | 205 | 218 |
| Thermal Conductivity at 100°C (W/m·K) | 37 | 36 | 30 | 26 | 26 |
| Mean Thermal Expansion 20–300°C (µm/m·°C) | 12.4 | 12.5 | 11.8 | 11.2 | 11.2 |
| Specific Heat (J/g·°C) | 0.46 | 0.46 | 0.46 | 0.46 | 0.46 |
| Approx. Max. Service Temperature | ≈ 595 °C | ≈ 600 °C | ≈ 650 °C | ≈ 650 °C | ≈ 650 °C |
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. Thinner 18 BWG (1.24 mm) and 20 BWG (0.89 mm) walls are available for exchanger service. Values are nominal; actual weights may vary within ASTM A1016 tolerances.
Where alloy steel heat exchanger tubes are used
Straight and U-tube bundles for high-temperature process exchangers.
Feed/effluent exchangers in hydrogen-rich, sulphur-bearing service.
HP and LP feedwater heater U-tube bundles in power plants.
Finned tubes for air coolers, economisers and waste heat recovery.
Reformer and cracker transfer-line exchangers and process coolers.
Ammonia synthesis loop exchangers resisting hydrogen attack.
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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