ASTM A249 Stainless Steel Tube
For Boiler, Superheater, Heat-Exchanger & Condenser
- International Standard : ASTM A249 / ASME SA249
- Material Grades : TP304/304L, TP316/316L, TP309/309S, TP310/310S, TP321/321H, TP347/347H, Duplex2205 / S31803, etc.
- Outer Diameter : 1/4″ - 12" , 6.35mm - 304.8mm
- Wall Thickness : 0.035″ - 0.12″ , 0.89mm - 3.05mm , Schedules: 10s, 20, 40s, 40, 60, 80s
- Tube Type : Welded , Seamless
- Mill Test Certificate(MTC) : EN10204 3.1
- Certificate : ISO 9001:2015 , PED 2014/68/EU , AD 2000-WO
Dimension of ASTM A249 Stainless Steel Tubes
| Tube OD | Wall Thickness | OD Tolerance | WT Tolerance | Length Tolerance | Weight |
|---|---|---|---|---|---|
| inch(mm) | inch(mm) | inch(mm) | inch(mm) | (kg/m) | |
| 1/4" (6.35) | 0.035" (0.89) | +/-0.005" (0.13) | +/-10.0% | +1/8" (3.18) -0 | 0.124 |
| 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 |
| 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 |
| 1" (25.4) | 0.065" (1.65) / 0.049"(1.25) | +/-0.005" (0.13) | +/-10.0% | +1/8" (3.18) -0 | 0.976 |
| 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 |
| 2" (50.8) | 0.065" (1.65) / 0.049"(1.25) | +/-0.008" (0.20) | +/-10.0% | +1/8" (3.18) -0 | 2.02 |
| 2-1/2" (63.5) | 0.065" (1.65) | +/-0.010" (0.25) | +/-10.0% | +1/8" (3.18) -0 | 2.54 |
| 3" (76.2) | 0.065" (1.65) | +/-0.010" (0.25) | +/-10.0% | +1/8" (3.18) -0 | 3.06 |
| 4" (101.6) | 0.083" (2.11) | +/-0.015" (0.38) | +/-10.0% | +1/8" (3.18) -0 | 5.23 |
| 6" (152.4) | 0.109" (2.77) | +/-0.030" (0.76) | +/-10.0% | +1/8" (3.18) -0 | 10.32 |
| 8" (203.2) | 0.109" (2.77) | +/-0.030" (0.76) | +/-10.0% | +1/8" (3.18) -0 | 13.86 |
| 10"(254) | 0.120"(3.05) | +/-0.040" (1.016) | +/-10.0% | +1/8" (3.18) -0 | - |
| 12"(304.8) | 0.120"(3.05) | +/-0.040" (1.016) | +/-10.0% | +1/8" (3.18) -0 | - |
Material Grades & Chemical Composition
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.
Description of ASTM A249 Stainless Steel Tubes
ASTM A249 Stainless Steel Tubing is the definitive standard from ASTM International specifying the requirements for welded austenitic stainless steel boiler, superheater, heat-exchanger, and condenser tubes. These tubes are designed for use in pressure-bearing applications where corrosion resistance and high-temperature service are paramount.
The standard covers grades of common austenitic stainless steels, including TP304/304L, TP316/316L, TP321, and TP347. The “TP” designation indicates it is a tube for pressure application. The manufacturing process involves forming flat-rolled strip (skelp) into a cylindrical shape and then welding the seam longitudinally using a Tungsten Inert Gas (TIG) or plasma arc welding process without the addition of filler metal. This results in a precise, clean, and high-integrity weld. The subsequent critical step is a solution annealing heat treatment, which dissolves carbides that can form during welding and restores the full corrosion resistance of the material, particularly its resistance to intergranular corrosion.
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