ASTM A249 TP304 Stainless Steel Bright Annealed Welded Tube

In heat exchanger, condenser, and boiler applications, the long-term reliability of ASTM A249 TP304 welded stainless steel tubes depends not only on their chemical composition, but also on weld integrity, surface finish, dimensional accuracy, and formability.

 

GNEE supplies ASTM A249 TP304 bright annealed (BA) tubes, which are manufactured using high-frequency TIG automatic welding, online weld seam conditioning, solution bright annealing, and 100% eddy current testing (ECT). Through precision bead smoothing (planishing) of the internal weld seam, the internal surface roughness achieves Ra ≤ 0.6 μm, effectively reducing fluid resistance, minimizing fouling, and enhancing heat transfer efficiency. This makes them particularly suitable for transporting clean media and continuous-operation heat exchange systems.

ASTM A249 TP304 Heat Exchanger Tube

TP304 Bright Annealed Stainless Steel Tube

To ensure smooth tube-to-tubesheet assembly, the outer diameter (OD) tolerance of these TP304 stainless steel welded tubes can reach ±0.10 mm, accompanied by excellent roundness and minimal ovality. This significantly facilitates the tube-bundling process in large-scale heat exchangers and improves assembly efficiency. Every batch of products undergoes comprehensive dimensional inspection via laser measurement equipment, supplemented by visual and surface quality audits.

 

The hardness of our ASTM A249 TP304 BA tubes is strictly controlled within HRB 75-80-softer than the standard requirement-making them ideal for U-bending processing. Each tube passes mandatory tests, including flattening, flaring, reverse flattening, as well as hydrostatic or non-destructive electrical testing, ensuring that the weld zone remains crack-free during subsequent fabrication processes such as flaring, tube expanding (roller expanding), and U-bending.

ASTM A249 TP304 Stainless Steel Welded Tube Chemical Composition

ASTM A249 TP304  Welded Tube Mechanical Properties

ASTM A249 Stainless Steel Heat Exchanger Tube Tolerances

Click to download ASTM A249.PDF

Applications of ASTM A249 TP304 Welded Tube

Power Generation: Used for boiler tubes, superheaters, and reheaters in power plants.
Chemical and Petrochemical: Heat exchangers and condensers for handling corrosive fluids and gases, as well as high-pressure chemical reaction processes.
Food, Beverage, and Pharmaceutical: Used for sanitary-grade piping and equipment.

Power Generation

Chemical and Petrochemical

Food, Beverage, and Pharmaceutical

If you are planning a project, I can assist you by estimating dimensions such as outer diameter (OD) and wall thickness, and by comparing grades like TP304 with TP316 or TP304L based on specific corrosion resistance requirements.

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ASTM A249 TP304 Tube Price Per Kg

The price of ASTM A249 TP304 welded stainless steel tubing generally ranges from $3.00 to $6.00 USD per kilogram (approx. $1,350 to $6,000 per ton), depending on wall thickness, order volume, and surface finish. Smaller, cut-to-length specialty sizes can reach up to $12 to $42 per kilogram.

Quality Control

Flattening Test: The pipe section is flattened to a specified distance; no cracks may appear at the weld seam. This is the most critical step for verifying weld quality.
Flaring Test: The pipe end is expanded to 1.2 times the outer diameter (for austenitic steel) to check for fractures in the pipe wall and weld seam.
Reverse Flattening Test: The pipe is cut longitudinally and flattened in reverse to inspect the fusion quality at the weld root.
Hardness Test: The hardness of TP304 is typically required not to exceed 90 HRB or 192 HBW.
Eddy Current Test (ECT): 100% inspection of the entire pipe length to detect localized defects in the weld seam and base metal surface.
Hydrostatic Test: Each pipe undergoes a pressure test.

 

Eddy Current Test (ECT)

  304 pipe PMI

 

Reverse Flattening Test

Flaring Test

High-quality packaging

Hexagonal Bundling: For standard specifications, hexagonal bundling using nylon rope or steel strapping is employed; cardboard is placed beneath the steel straps to prevent indentation.
Export-Grade Wooden Cases (Seaworthy Wooden Cases):
Casing: Solid wood or plywood cases treated with IPPC-compliant fumigation must be used.
Lining: The interior of the case is lined with waterproof felt or plastic sheeting.
Reinforcement: U-shaped wooden supports are installed at intervals within the case to prevent the pipes from bending or shifting during transport.
U-Bend Pipe Packaging: For U-bend pipes, specialized steel or wooden supports are required to ensure the bent section remains suspended and free from load-bearing stress. 

FAQ

What are the common tolerances for ASTM A249 TP304 tubing?

Dimensional tolerances for A249 tubing comply with the ASTM A1016 standard. Typically, the outside diameter tolerance is controlled within ±0.1 mm to ±0.15 mm, and the wall thickness tolerance is ±10%. For automated tube-drawing processes, we can provide tighter, specialized tolerance controls.

What is the difference between ASTM A249 TP304 and TP304L?

The primary difference is carbon content: ASTM A249 TP304 permits up to 0.08% carbon, while TP304L allows a maximum of 0.03%. This lower carbon in TP304L prevents intergranular corrosion during welding, making it ideal for welded heat exchangers and boilers where corrosion resistance is critical.

What is the difference between ASTM A269 and A249?

ASTM A249 is specifically for welded tubes used in high-temperature, high-pressure environments like boilers and heat exchangers. In contrast, ASTM A269 applies to both seamless and welded tubes designed for general, less demanding corrosion-resistant and temperature services, such as instrumentation lines.

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