ASTM A249 TP304 Welded Tubes For Heat Exchangers
Material Grade;TP304 (UNS S30400)
Manufacturing Process;Automatic TIG Welded, Cold Drawn/Cold Rolled, Bright Annealed (BA)
Tube Type;Straight Tube, U-Bend Tube
Outside Diameter (OD);6.35 mm – 76.20 mm (1/4" – 3")
Wall Thickness (WT);0.50 mm – 3.50 mm
Length;Up to 18 m Random Length or Customized
Surface Finish;Bright Annealed (BA), Pickled (AP)
Weld Seam;Online Weld Bead Removal & Smoothing
Inner Surface Roughness;Ra ≤ 0.6 μm (Optional Ra ≤ 0.4 μm)
Melting Range;1400–1450°C
ASTM A249 TP304 welded tubes for heat exchangers
ASTM A249 TP304 Heat Exchanger Welded Tubes are manufactured from classic 18Cr-8Ni austenitic stainless steel. They are specifically engineered for use in heat exchangers, condensers, coolers, and other thermal equipment operating under conventional corrosive environments and medium-temperature heat exchange conditions.
GNEE supplies premium-quality ASTM A249 TP304 stainless steel tubes produced using advanced TIG (Tungsten Inert Gas) or MIG (Metal Inert Gas) welding technologies, ensuring superior weld quality and minimal defect rates. Furthermore, the post-weld heat treatment effectively eliminates residual welding stresses while enhancing both the mechanical properties and corrosion resistance of the tubes. These tubes maintain excellent toughness within a wide temperature range of -196°C to 600°C, allowing them to adapt to alternating thermal cycles and significantly reducing the risk of thermal fatigue cracking.
Compared to TP304 seamless steel pipes, welded tubes offer a distinct cost advantage. They are widely utilized in power plant boiler piping, industrial heat exchanger connection lines, high-pressure fluid transport systems in the chemical industry, and marine steam systems. They are particularly suitable for medium-to-high pressure applications where post-weld heat treatment or radiographic testing is not mandatory.
We can supply ASTM A249 TP304 heat exchanger tubes with an outer diameter (OD) of 10–508mm and a wall thickness (WT) of 0.8–12mm. Our portfolio supports thin-walled applications (such as 0.8mm ultra-thin tubes for plate heat exchangers) as well as large-diameter requirements (such as 508mm shell-side main pipelines) to satisfy various heat transfer areas and pressure ratings (up to 30MPa). Additionally, we provide custom pre-treatment services based on engineering drawings, including beveling (V-type/U-type), fixed-length cutting (tolerance within ±5mm), and pre-bending forming to directly match the hole patterns of heat exchanger tube sheets, thereby significantly improving your on-site installation efficiency.
ASTM A249 TP304 Heat Exchanger Tube Specification
| Item | Specification |
|---|---|
| Product Name | ASTM A249 TP304 Welded Tubes for Heat Exchangers |
| Manufacturing Process | Automatic TIG Welded, Cold Drawn/Cold Rolled, Bright Annealed (BA) |
| Tube Type | Straight Tube, U-Bend Tube |
| Outside Diameter (OD) | 6.35 mm – 76.20 mm (1/4" – 3") |
| Wall Thickness (WT) | 0.50 mm – 3.50 mm |
| Length | Up to 18 m Random Length or Customized |
| Surface Finish | Bright Annealed (BA), Pickled (AP), Polished |
| Weld Seam | Online Weld Bead Removal & Smoothing |
| Inner Surface Roughness | Ra ≤ 0.6 μm (Optional Ra ≤ 0.4 μm) |
| Density | 7.93 g/cm³ |
| Melting Range | 1400–1450°C |
| Hardness | ≤ HRB 80 (Typical HRB 75–80 after BA) |
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2%) | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Heat Treatment | Solution Annealed & Bright Annealed |
| Operating Temperature | -196°C to 870°C (Continuous Service) |
| Certificate | EN 10204 3.1 MTC, ISO 9001, SGS/BV/TUV Third-Party Inspection Available |
| Packing | Plastic Caps, PE Wrapping, Wooden Cases, Seaworthy Export Packing |
Chemical Composition (%)
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Nickel (Ni) |
| Value | 0.08 max | 2.00 max | 0.045 max | 0.030 max | 0.75 max | 18.0 - 20.0 | 8.0 - 11.0 |
Dimensional Tolerances (per ASTM A1016)
Typical tolerances for heat exchanger tubes (outside diameter and wall thickness).
| Outside Diameter (OD) | OD Tolerance | Wall Thickness (WT) | WT Tolerance |
| < 25.4 mm | ± 0.10 mm | < 1.0 mm | ± 0.15 mm |
| 25.4 – 38.1 mm | ± 0.15 mm | 1.0 – 2.0 mm | ± 10% |
| 38.1 – 50.8 mm | ± 0.20 mm | > 2.0 mm | ± 10% |
| Length Tolerance | + 3.0 mm / - 0 mm | Ovality | Within OD tolerance |
HSN Code Of ASTM A249 Type 304L Welded Stainless Steel Tube
| Product | HSN Code |
|---|---|
| ASTM A249 Type 304L Tube | 7304319000 |
If you have project requirements for 304L stainless steel heat exchanger tubes, we welcome your orders. GNEE maintains a large inventory of popular products for you to choose from. These are available in both seamless and welded forms; please contact our factory immediately for detailed chemical composition specifications and free samples.
Quality Control
Before leaving the factory, 304 stainless steel pipes undergo the following tests to ensure product quality:
Hardness Test
Reverse-bend Test
Flattening Test
Tension Test
Flange Test
Nondestructive Electric Test
Hydrostatic Test
Standard Packaging
Regarding packaging and shipping, all stainless steel plates undergo moisture-proof treatment and are securely packed using methods such as wooden crates, pallets, or bubble wrap. Standard containers or specialized transport vehicles are used for shipping to ensure the integrity and safety of the goods throughout transit. We offer global shipping with a typical lead time of 7–15 days from production to delivery, ensuring timely arrival at the customer's location.
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