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What is ASTM A249?
ASTM A249 (ASME SA249) is the standard specification for welded austenitic stainless steel boiler, superheater, heat exchanger and condenser tubes intended for high-temperature and corrosion-resistant service. The specification establishes requirements for manufacturing, chemical composition, mechanical properties, dimensions, heat treatment, testing and inspection to support consistent quality and reliable performance.
Common ASTM A249 stainless steel tube grades include TP304, TP304L, TP316, TP316L, TP321, and TP347, along with other specified austenitic stainless steel grades. These tubes provide corrosion resistance, reliable mechanical properties and controlled welded construction for demanding heat-transfer applications.
ASTM A249 Welded Stainless Steel Tubes are widely used in boilers, superheaters, heat exchangers, condensers, power generation, petrochemical, chemical processing, oil and gas, pharmaceutical, food processing and marine industries. Kamal Steels supplies ASTM A249 tubes in applicable grades, sizes, wall thicknesses and lengths, with Mill Test Certificates (EN 10204 3.1), third-party inspection and customized project requirements for domestic and international applications.
ASTM A249 Stainless Steel Tube Specification
ASTM A249 covers welded austenitic steel tubes intended for boiler, superheater, heat exchanger and condenser service. These tubes are manufactured using high-quality stainless steel strips and undergo welding, heat treatment and testing procedures to ensure superior performance.
| Specification | Details |
|---|---|
| Standard | ASTM A249 / ASME SA249 |
| Product | Welded Austenitic Stainless Steel Tubes |
| Manufacturing Process | Welded |
| Applications | Boiler, Superheater, Heat Exchanger and Condenser Service |
| Dimensions | Manufactured to specified outside diameter and wall thickness requirements |
| Length | Standard, Fixed and Custom Lengths |
| Certification | Mill Test Certificate (MTC) / EN 10204 3.1 |
ASTM A249 Tube Grades
ASTM A249 welded stainless steel tubes are available in several austenitic grades to suit different corrosion, temperature, and pressure requirements for boiler, superheater, heat exchanger, and condenser applications.
| Grade | Typical Features & Applications |
|---|---|
| TP304 | General corrosion-resistant service for heat exchangers and condensers. |
| TP304L | Low-carbon grade offering improved weldability and reduced carbide precipitation. |
| TP316 | Enhanced resistance to chlorides and aggressive chemical environments. |
| TP316L | Low-carbon 316 grade for welded systems requiring superior corrosion resistance. |
| TP321 | Titanium-stabilized grade suitable for elevated-temperature service. |
| TP347 | Niobium-stabilized grade designed for high-temperature applications. |
ASTM A249 Selected Chemical Composition
The chemical composition of ASTM A249 tubes varies by stainless steel grade. The table below shows the nominal composition of the most commonly supplied grades.
| Grade | Carbon (%) | Chromium (%) | Nickel (%) |
|---|---|---|---|
| TP304 | 0.08 Max | 18.0 – 20.0 | 8.0 – 11.0 |
| TP304L | 0.035 Max | 18.0 – 20.0 | 8.0 – 12.0 |
| TP316 | 0.08 Max | 16.0 – 18.0 | 10.0 – 14.0 |
| TP316L | 0.035 Max | 16.0 – 18.0 | 10.0 – 14.0 |
ASTM A249 Selected Mechanical Properties
The following table presents selected minimum mechanical requirements for commonly supplied ASTM A249 grades.
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| TP304 | 515 Min | 205 Min | 35 Min |
| TP304L | 485 Min | 170 Min | 35 Min |
| TP316 | 515 Min | 205 Min | 35 Min |
| TP316L | 485 Min | 170 Min | 35 Min |
ASTM A249 Comparable Grades
Common ASTM A249 stainless steel tube grades include TP304, TP304L, TP316, TP316L, TP321 and TP347.
| ASTM Grade | UNS Number | Werkstoff No. |
|---|---|---|
| TP304 | S30400 | 1.4301 |
| TP304L | S30403 | 1.4307 |
| TP316 | S31600 | 1.4401 |
| TP316L | S31603 | 1.4404 |
| TP321 | S32100 | 1.4541 |
| TP347 | S34700 | 1.4550 |
ASTM A249 Tube Size Chart
ASTM A249 stainless steel welded tubes are manufactured in various outside diameters, wall thicknesses and lengths to meet boiler, heat exchanger and condenser applications. The following table shows representative ASTM A249 welded tube sizes commonly supplied by Kamal Steels. Custom dimensions are available on request.
| Outside Diameter (OD) | Wall Thickness (WT) | Standard Length | Available Forms |
|---|---|---|---|
| 12.70 mm (1/2") | 0.89 – 2.11 mm | Up to 6 m | Straight / U-Bend |
| 15.88 mm (5/8") | 0.89 – 2.77 mm | Up to 6 m | Straight / U-Bend |
| 19.05 mm (3/4") | 1.00 – 3.05 mm | Up to 6 m | Straight / U-Bend |
| 25.40 mm (1") | 1.24 – 3.40 mm | Up to 6 m | Straight / U-Bend |
| 31.75 mm (1-1/4") | 1.24 – 3.56 mm | Up to 6 m | Straight / U-Bend |
| 38.10 mm (1-1/2") | 1.24 – 4.00 mm | Up to 6 m | Straight / U-Bend |
| 50.80 mm (2") | 1.65 – 4.78 mm | Up to 6 m | Straight / U-Bend |
| 63.50 mm (2-1/2") | 2.00 – 5.54 mm | Up to 6 m | Straight |
| 76.20 mm (3") | 2.11 – 6.35 mm | Up to 6 m | Straight |
Supply Capability: ASTM A249 welded tubes are available in outside diameters from 6.35 mm to 76.20 mm, wall thicknesses from 0.5 mm to 6.35 mm, and standard lengths up to 6 metres. Cut-to-length, U-bend tubes, polished finish and custom dimensions can also be supplied as per customer requirements.
Heat Treatment and Testing
| Test / Process | Description |
|---|---|
| Solution Annealing | Performed according to the applicable ASTM A249 requirements and material grade. |
| Hydrostatic / Nondestructive Testing | Performed according to the applicable ASTM A249 testing requirements. |
| Dimensional Inspection | Checks outside diameter, wall thickness, length and other specified dimensions. |
| PMI Testing | Positive Material Identification available on request. |
| Mill Test Certificate | EN 10204 3.1 certification supplied as specified. |
| Third-Party Inspection | Available through SGS, TUV, BV, DNV and other inspection agencies upon request. |
ASTM A249 Applications
| Industry | Application |
|---|---|
| Heat Exchangers | Shell & tube heat exchanger systems |
| Condensers | Power plants and industrial condensers |
| Boilers | Boiler tubing applications |
| Chemical Processing | Corrosion-resistant process equipment |
| Petrochemical Plants | Heat transfer and process piping |
| Oil & Gas | Process and utility systems |
| Power Generation | Steam and heat recovery systems |
| Food & Beverage | Sanitary heat transfer equipment |
| Pharmaceutical | Clean process and heat exchange systems |
| Marine Industry | Cooling water and condenser applications |
Frequently Asked Questions
ASTM A249 is the standard specification for welded austenitic stainless steel boiler, superheater, heat exchanger and condenser tubes used in high-temperature and corrosive environments.
ASTM A249 Tubes are widely used in heat exchangers, condensers, boilers, power plants, refineries, petrochemical facilities and process industries requiring efficient heat transfer.
Common ASTM A249 grades include TP304, TP304L, TP316, TP316L, TP321, TP347 and other austenitic stainless steel grades.
ASTM A249 is specifically designed for heat exchanger and condenser applications, while ASTM A269 is intended for general service stainless steel tubing applications.
ASTM A249 covers welded stainless steel tubes that undergo additional testing and inspection to ensure performance in heat transfer applications.
Industries such as power generation, petrochemical, oil and gas, chemical processing, pharmaceutical and food processing commonly use ASTM A249 tubes.
ASTM A249 Tubes undergo hydrostatic testing, eddy current testing, flattening tests, flaring tests, dimensional inspection and chemical analysis.
Yes, Kamal Steels supplies ASTM A249 Stainless Steel Tubes with Mill Test Certificates (MTC), EN 10204 3.1 certification and third-party inspection reports.