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Help CenterASTM A249 / A249M Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
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ASTM A249 tube available including: Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP316H, TP321H, TP347H, and TP348H are modifications of Grades TP304, TP309S, TP309Cb, TP310S, TP310Cb, TP316, TP321, TP347, and TP348, and are intended for high-temperature service such as for superheaters and reheaters. The tubing sizes and thicknesses usually furnished to this specification are 1/8 in. [3.2 mm] in inside diameter to 12 in. [304.8 mm] in outside diameter and 0.015 to 0.320 in. [0.4 to 8.1 mm], inclusive, in wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.
Standard: ASTM A249
Grade: TP304/304L/304H, TP316/316L/316H, TP309S/309H, TP310S/310H, TP316H, TP321/321H, TP347/347H
ASTM A249 tubing size: OD: 4 - 321mm WT: 0.4 - 8.1mm
Length: fixed length or random
Delivery condition: annealing/pickling/ passivization
Packaging: bundle, plywood case.
ASTM A249 covers welded austenitic stainless steel boiler, superheater, heat exchanger, and condenser tubes. These tubes are designed for high-temperature and general corrosive service.
Key SpecificationsStandard: ASTM A249
Material: Austenitic stainless steels
Form: Welded tubes
Applications: Boilers, superheaters, heat exchangers, condensers
The chemical composition varies depending on the specific grade of stainless steel used. Below are typical compositions for common grades:
| Element | TP304 (%) | TP316 (%) | TP321 (%) |
|---|---|---|---|
| Carbon (C) | ≤ 0.08 | ≤ 0.08 | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 |
| Chromium (Cr) | 18.0 – 20.0 | 16.0 – 18.0 | 17.0 – 19.0 |
| Nickel (Ni) | 8.0 – 11.0 | 10.0 – 14.0 | 9.0 – 12.0 |
| Molybdenum (Mo) | – | 2.0 – 3.0 | – |
| Titanium (Ti) | – | – | 5(C+N) – 0.70 |
| Property | TP304 | TP316 | TP321 |
|---|---|---|---|
| Tensile Strength (min) | 515 MPa (75 ksi) | 515 MPa (75 ksi) | 515 MPa (75 ksi) |
| Yield Strength (min) | 205 MPa (30 ksi) | 205 MPa (30 ksi) | 205 MPa (30 ksi) |
| Elongation (min) | 35% | 35% | 35% |
| Hardness (max) | 90 HRB | 90 HRB | 90 HRB |
| Outer Diameter (OD) (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|
| 12.7 | 1.24 | 0.355 |
| 19.05 | 1.65 | 0.698 |
| 25.4 | 2.11 | 1.270 |
| 38.1 | 2.77 | 2.284 |
| 50.8 | 3.05 | 3.593 |
| 76.2 | 3.40 | 6.342 |
Pressure ratings depend on the tube dimensions and operating conditions. Below are typical pressure ratings for common sizes at room temperature:
| Tube Size (OD x Wall) (mm) | Pressure Rating (psi) |
|---|---|
| 12.7 x 1.24 | 2,900 |
| 19.05 x 1.65 | 2,200 |
| 25.4 x 2.11 | 1,800 |
| 38.1 x 2.77 | 1,500 |
| 50.8 x 3.05 | 1,300 |
| 76.2 x 3.40 | 1,100 |
Note: These values are indicative and can vary based on the specific grade and temperature conditions.
Tolerances| Dimensions | Tolerance Range |
|---|---|
| Outside Diameter (OD) | ±0.10 mm for OD ≤ 25.4 mm |
| ±0.15 mm for 25.4 mm |
|
| ±0.25 mm for OD > 38.1 mm | |
| Wall Thickness | ±10% |
| Length | Up to 6.0 m ±6.0 mm |
| Ovality | 2% of OD for thin-wall tubes |
| Straightness | 1/8 inch in any 10-foot length |
TP304 Stainless Steel Tubes:
Composition: 18% Chromium, 8% Nickel
Applications: General-purpose use, good corrosion resistance
TP316 Stainless Steel Tubes:
Composition: 16% Chromium, 10% Nickel, 2% Molybdenum
Applications: Enhanced corrosion resistance, particularly against chlorides and industrial pollutants
TP321 Stainless Steel Tubes:
Composition: 18% Chromium, 9% Nickel, Ti stabilized
Applications: High-temperature environments, good resistance to intergranular corrosion
TP347 Stainless Steel Tubes:
Composition: 18% Chromium, 10% Nickel, Nb stabilized
Applications: High-temperature resistance, particularly against carbide precipitation
ConclusionASTM A249 stainless steel boiler tubes are essential in various high-temperature and corrosive environments. Understanding their specifications, chemical composition, mechanical properties, and applications can help in selecting the right type of tube for your specific needs. Whether you’re looking for durability, corrosion resistance, or mechanical strength, these tubes offer a versatile solution for industrial applications.
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