For Boiler, Superheater, Heat-Exchanger & Condenser
- Standard
-
Material Grades
- Outer Diameter
- Wall Thickness
- Tube Type
- MTC
- Certificate
- ASTM A249 / ASME SA249
- TP304/304L, TP316/316L, TP309/309S, TP310/310S, TP321/321H, TP347/347H
- 1/4″ - 12"
- 0.035″ - 0.12″
- Welded , Seamless
- EN10204 3.1
- ISO 9001:2015 , PED 2014/68/EU , AD 2000-WO
- 6.35mm - 304.8mm
- 0.89mm - 3.05mm
Dimension of ASTM A249 Stainless Steel Tubes
| DN | Tube OD | Wall Thickness | OD Tolerance | WT Tolerance | Length Tolerance | Weight |
|---|---|---|---|---|---|---|
| inch(mm) | inch(mm) | inch(mm) | inch(mm) | (kg/m) | ||
| 8 | 1/4" (6.35) | 0.035" (0.89) | +/-0.005" (0.13) | +/-10.0% | +1/8" (3.18) -0 | 0.124 |
| 15 | 1/2" (12.7) | 0.065" (1.65) / 0.049"(1.25) | +/-0.005" (0.13) | +/-10.0% | +1/8" (3.18) -0 | 0.454 |
| 20 | 3/4" (19.1) | 0.065" (1.65) / 0.049"(1.25) | +/-0.005" (0.13) | +/-10.0% | +1/8" (3.18) -0 | 0.717 |
| 25 | 1" (25.4) | 0.065" (1.65) / 0.049"(1.25) | +/-0.005" (0.13) | +/-10.0% | +1/8" (3.18) -0 | 0.976 |
| 40 | 1-1/2" (38.1) | 0.065" (1.65) / 0.049"(1.25) | +/-0.008" (0.20) | +/-10.0% | +1/8" (3.18) -0 | 1.50 |
| 50 | 2" (50.8) | 0.065" (1.65) / 0.049"(1.25) | +/-0.008" (0.20) | +/-10.0% | +1/8" (3.18) -0 | 2.02 |
| 65 | 2-1/2" (63.5) | 0.065" (1.65) | +/-0.010" (0.25) | +/-10.0% | +1/8" (3.18) -0 | 2.54 |
| 80 | 3" (76.2) | 0.065" (1.65) | +/-0.010" (0.25) | +/-10.0% | +1/8" (3.18) -0 | 3.06 |
| 100 | 4" (101.6) | 0.083" (2.11) | +/-0.015" (0.38) | +/-10.0% | +1/8" (3.18) -0 | 5.23 |
| 150 | 6" (152.4) | 0.109" (2.77) | +/-0.030" (0.76) | +/-10.0% | +1/8" (3.18) -0 | 10.32 |
| 200 | 8" (203.2) | 0.109" (2.77) | +/-0.030" (0.76) | +/-10.0% | +1/8" (3.18) -0 | 13.86 |
| 250 | 10"(254) | 0.120"(3.05) | +/-0.040" (1.016) | +/-10.0% | +1/8" (3.18) -0 | - |
| 300 | 12"(304.8) | 0.120"(3.05) | +/-0.040" (1.016) | +/-10.0% | +1/8" (3.18) -0 | - |
Material Grades
ASTM A249 covers several common austenitic and duplex stainless steel grades. The choice of grade depends on the specific corrosive environment, temperature, and mechanical requirements.
TP304 / TP304L: The most widely used stainless steel grade. TP304 offers good general corrosion resistance and excellent fabrication characteristics. The low-carbon “L” grade (TP304L) is specified to prevent sensitization (carbide precipitation) during welding, which can lead to intergranular corrosion in corrosive environments.
TP316 / TP316L: Similar to 304 but with the addition of molybdenum (2-3%). This significantly enhances resistance to pitting and crevice corrosion, particularly from chlorides and other halides. This makes it the preferred choice for marine applications, cooling tower water, and many chemical processes.
TP321: Stabilized with titanium, which minimizes carbide precipitation during exposure to high temperatures in the range of 800-1500°F (425-815°C). This makes it ideal for high-temperature service such as in superheaters and heat exchangers handling high-temperature gases.
TP347: Stabilized with niobium (and sometimes tantalum), offering similar high-temperature performance to TP321 but often with improved creep strength. It is also highly resistant to intergranular corrosion.
TP309S & TP310S: Higher alloy grades with increased chromium and nickel content for improved oxidation and carburization resistance in severely high-temperature environments, such as furnace parts.
Duplex Stainless Steels (e.g., S31803): While less common in A249, duplex grades offer a combination of high strength (approximately twice the yield strength of austenitic grades) and excellent resistance to stress corrosion cracking and pitting. They are used in demanding offshore and chemical applications.
ASTM A249 Stainless Steel Tube ASTM A249 Stainless Steel Tube ASTM A249 Stainless Steel Tube ASTM A249 Stainless Steel Tube ASTM A249 Stainless Steel Tube ASTM A249 Stainless Steel Tube
Description of ASTM A249 Stainless Steel Tubes
ASTM A249 is a standard specification that governs the requirements for welded austenitic stainless steel tubes designed specifically for critical service in pressure-bearing components such as boilers, superheaters, heat-exchangers, and condensers. These are not general-purpose tubes; they are engineered for environments that demand high reliability under pressure, temperature, and corrosion.
The fundamental purpose of this standard is to ensure that the tubes can perform safely and durably in demanding thermal and mechanical conditions. These tubes are manufactured using an automated welding process, which creates a high-integrity seam. Following welding, the tubes undergo a solution annealing heat treatment. This process is crucial as it dissolves any carbides that may have formed during welding, thereby restoring the material’s full corrosion resistance, particularly against intergranular attack. The annealing also softens the tube, making it suitable for subsequent forming and bending operations during the fabrication of equipment.
A key differentiator for A249 tubes is the mandatory nondestructive testing requirement. Every single length of tube is subjected to an electric test, most commonly an eddy current test, to verify the integrity of the weld and the parent metal without causing damage. This ensures any defects that could lead to failure under pressure are detected. The standard also enforces strict dimensional tolerances for outside diameter, wall thickness, and straightness. This precision is essential for proper fitment into tube sheets during the assembly of heat exchangers and condensers, ensuring leak-proof joints.
Austenitic Stainless Steel Welded Tube Solutions
Specializing in precision-welded stainless steel tubing for boilers, superheaters, heat exchangers, and condensers. Delivering internationally certified materials for energy, chemical, and petrochemical industries.
15+
Alloy Grades Covered
6.35–304.8 mm
OD Range
0.5–4.5 mm
Wall Thickness
100%
Alloy GradesHydrostatic Tested
Industrial Welded Tube Precision Manufacturing
ASTM A249 covers austenitic alloy steel welded tubes for boilers, superheaters, heat exchangers, condensers, and similar applications. Products utilize automated welding processes with complete heat treatment, non-destructive examination, and hydrostatic testing.
Automated Welding
GTAW/GMAW automated lines ensuring weld consistency
Full Solution Annealing
Eliminates residual stress, restores corrosion resistance
100% Hydrostatic Test
Tube-by-tube testing ensures pressure integrity
Full Traceability
Heat/lot number tracking with MTC provided
Dimensional Data
| DN | Tube OD | Wall Thickness | OD Tolerance | WT Tolerance | Length Tolerance | Weight |
|---|---|---|---|---|---|---|
| inch(mm) | inch(mm) | inch(mm) | inch(mm) | (kg/m) | ||
| 8 | 1/4" (6.35) | 0.035" (0.89) | +/-0.005" (0.13) | +/-10.0% | +1/8" (3.18) -0 | 0.124 |
| 15 | 1/2" (12.7) | 0.065" (1.65) / 0.049"(1.25) | +/-0.005" (0.13) | +/-10.0% | +1/8" (3.18) -0 | 0.454 |
| 20 | 3/4" (19.1) | 0.065" (1.65) / 0.049"(1.25) | +/-0.005" (0.13) | +/-10.0% | +1/8" (3.18) -0 | 0.717 |
| 25 | 1" (25.4) | 0.065" (1.65) / 0.049"(1.25) | +/-0.005" (0.13) | +/-10.0% | +1/8" (3.18) -0 | 0.976 |
| 40 | 1-1/2" (38.1) | 0.065" (1.65) / 0.049"(1.25) | +/-0.008" (0.20) | +/-10.0% | +1/8" (3.18) -0 | 1.50 |
| 50 | 2" (50.8) | 0.065" (1.65) / 0.049"(1.25) | +/-0.008" (0.20) | +/-10.0% | +1/8" (3.18) -0 | 2.02 |
| 65 | 2-1/2" (63.5) | 0.065" (1.65) | +/-0.010" (0.25) | +/-10.0% | +1/8" (3.18) -0 | 2.54 |
| 80 | 3" (76.2) | 0.065" (1.65) | +/-0.010" (0.25) | +/-10.0% | +1/8" (3.18) -0 | 3.06 |
| 100 | 4" (101.6) | 0.083" (2.11) | +/-0.015" (0.38) | +/-10.0% | +1/8" (3.18) -0 | 5.23 |
| 150 | 6" (152.4) | 0.109" (2.77) | +/-0.030" (0.76) | +/-10.0% | +1/8" (3.18) -0 | 10.32 |
| 200 | 8" (203.2) | 0.109" (2.77) | +/-0.030" (0.76) | +/-10.0% | +1/8" (3.18) -0 | 13.86 |
| 250 | 10"(254) | 0.120"(3.05) | +/-0.040" (1.016) | +/-10.0% | +1/8" (3.18) -0 | - |
| 300 | 12"(304.8) | 0.120"(3.05) | +/-0.040" (1.016) | +/-10.0% | +1/8" (3.18) -0 | - |
Composition & Properties
- S30400
- S30403
- S31600
- S31603
- S31703
- S32100
- S34700
- 304
- 304L
- 316
- 316L
- 317L
- 321
- 347
- 0.08
- 0.035
- 0.08
- 0.035
- 0.035
- 0.08
- 0.08
- 18.0–20.0
- 18.0–20.0
- 16.0–18.0
- 16.0–18.0
- 18.0–20.0
- 17.0–19.0
- 17.0–19.0
- 8.0–11.0
- 8.0–12.0
- 10.0–14.0
- 10.0–14.0
- 11.0–15.0
- 9.0–12.0
- 9.0–13.0
- —
- —
- 2.0–3.0
- 2.0–3.0
- 3.0–4.0
- —
- —
- 515 MPa
- 485 MPa
- 515 MPa
- 485 MPa
- 485 MPa
- 515 MPa
- 515 MPa
304 / 304L
General-purpose austenitic stainless steel with excellent atmospheric and steam corrosion resistance. Superior cold forming and welding characteristics.
316 / 316L
Molybdenum-bearing austenitic steel with significantly enhanced resistance to chloride pitting and crevice corrosion. Ideal for marine and chemical processing environments.
321 / 347
Titanium/niobium-stabilized grades effectively preventing intergranular corrosion. Designed for long-term service in high-temperature boiler and superheater systems.
Quality Systems & Testing
Every tube undergoes rigorous inspection and performance testing in accordance with ASTM A249 requirements, ensuring traceable and reliable delivery quality.
Positive Material Identification
XRF spectrometry analysis verifying chemical composition per grade
Non-Destructive Examination
Eddy current / ultrasonic testing with 100% weld coverage
Hydrostatic Testing
Tube-by-tube pressure testing per standard requirements, dwell time ≥ 5 seconds
Material Test Reports
EN 10204 3.1 / 3.2 certificates available with third-party inspection
Industry Applications
Products serve energy, petrochemical, and heavy industrial sectors, meeting the demands of high-temperature, high-pressure, and corrosive service conditions.
Power Generation
Supercritical and ultra-supercritical boiler superheater and reheater tubes, engineered for sustained creep strength under high-temperature, high-pressure steam conditions.
Petrochemical
Tube bundles for refinery units and chemical reactors, resistant to hydrogen sulfide, chlorides, and aggressive process media ensuring long-term operational safety.
Heat Exchangers
Shell-and-tube and plate heat exchanger tubing with superior thermal conductivity and fouling resistance, suitable for seawater cooling and process heat transfer applications.
