ASTM A249 TP304 BA Stainless Steel Welded Tube , Boiler and Heat Exchanger Tube
ASTM A249 TP304 Bright Annealed Stainless Steel Welded Tube Heat Exchanger Tube
ASTM A249 is a standard specification for welded austenitic stainless steel such as TP304/ 304L/ 316L ... tubing intended for use in boilers, heat exchangers, and similar applications. The tubing is produced by a welding process, usually using a continuous welding method. This results in a smooth interior surface, which is important for flow characteristics in heat equipments. ASTM A249 includes specific testing requirements to ensure the integrity of the tubing. This can include hydrostatic testing, eddy current testing, and non-destructive testing methods to check for leaks and other defects.
ASTM A249 TP304 Stainless Steel Welded Tube Equivalent Grades
| JIS | ASTM | UNS | ISO | DIN EN/DIN | W-Nr. | EN | GOST | BS EN/BS |
| SUS 304 | 304 | S30400 | X5CrNi 18-10 | X5CrNi 18-10 (X5CrNi 18-9) |
1.4301 | X5CrNi 18-10 | 08Х18Н10 | 304S15 |
ASTM A249 TP304 Stainless Steel Welded Tube Chemical Composition
| Grade | C | Si | Mn | Cr | Ni | S | P | Fe |
| TP304 | 0,08 | 1,0 | 2 | 18 – 20 | 8 – 11 | 0,03 | 0,045 | Bal. |
ASTM A249 TP304 Stainless Steel Welded Tube Mechanical Properties
| Heat treatment/ condition | Tensile Strength Mpa |
Yield Point σs Mpa |
Elongation δ % |
HBW |
|---|---|---|---|---|
| Solutioning Temperature 1040℃ | ≥515 | ≥205 | ≥35 | HRB ≤90 |
Dimensional Tolerences
| Size OD | Nominal Wall | Outside Diameter | Length | Wall |
| 1/2" (12.7) | 0.065" (1.65)/0.049" (1.25) | +/-0.005 (0.13) | +1/8" (3.18) - 0 | +/-10.0% |
| 3/4" (19.1) | 0.065" (1.65)/0.049" (1.25) | +/-0.005 (0.13) | +1/8" (3.18) - 0 | +/-10.0% |
| 1" (25.4) | 0.065" (1.65)/0.049" (1.25) | +/-0.005 (0.13) | +1/8" (3.18) - 0 | +/-10.0% |
| 1-1/2" (38.1) | 0.065" (1.65)/0.049" (1.25) | +/-0.008" (0.20) | +1/8" (3.18) - 0 | +/-10.0% |
| 2" (50.8) | 0.065" (1.65)/0.049" (1.25) | +/-0.008" (0.20) | +1/8" (3.18) - 0 | +/-10.0% |
| 2-1/2" (63.5) | 0.065" (1.65) | +/-0.010" (0.25) | +1/8" (3.18) - 0 | +/-10.0% |
| 3" (76.2) | 0.065" (1.65) | +/-0.010" (0.25) | +1/8" (3.18) - 0 | +/-10.0% |
| 4" (101.6) | 0.083" (2.11) | +/-0.015" (0.38) | +1/8" (3.18) - 0 | +/-10.0% |
| 6" (152.4) | 0.083" (2.11) | +/-0.030" (0.76) | +1" (25.4) - 0 | +/-10.0% |
| 6" (152.4) | 0.109" (2.77) | +/-0.030" (0.76) | +1" (25.4) - 0 | +/-10.0% |
| 8" (203.2) | 0.109" (2.77) | +0.061" (1.55)/-0.031" (0.79) | +1" (25.4) - 0 | +/-10.0% |
Why Choose ASTM A249 TP304 stainless steel welded tube instead of ASTM A213 TP304 stainless steel seamless tube?
1. Cost-Effectiveness
- Welded Tubes: Generally, welded tubes are more cost-effective to manufacture than seamless tubes. This can significantly reduce material costs, especially for larger projects.
- Seamless Tubes: Manufacturing seamless tubes tends to be more expensive due to the processes involved, which can drive up overall project costs.
2. Availability and Lead Time
- Welded Tubes: Typically have shorter lead times and are often available in a wider range of sizes and specifications.
- Seamless Tubes: May have longer lead times and more limited availability, depending on specific dimensions and requirements.
3. Mechanical Properties
- Seamless Tubes: Often exhibit superior mechanical properties due to the absence of a weld seam, which can be advantageous in high-pressure applications.
- Welded Tubes: While generally strong, they may have slightly reduced mechanical performance at the weld area. Modern welding techniques can mitigate this issue, maintaining strength close to that of seamless tubing.
4. Pressure and Temperature Ratings
- Seamless tubes might be preferred in high-pressure applications or extreme temperature conditions, where the integrity of the material is paramount.
- Welded tubes can still perform well under many conditions but may be less suitable for certain critical high-stress applications.
Applications
- Heat Exchangers/superheater: Particularly used in heat exchangers due to its ability to resist oxidation and corrosion at elevated temperatures.
- Boiler
- Chemical Processing: Suitable for handling a wide range of chemicals.
- Food and Beverage Industry: Common in applications where hygiene and corrosion resistance are essential.
- Pharmaceuticals: Used in systems needing a clean and sterile environment.
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