ASTM A249 TP304H Stainless Steel Welded Tubes

ASTM A249 TP304H stainless steel welded tubes are specifically engineered for high-temperature service applications such as boilers, superheaters, and heat exchangers. TP304H is a heat-resistant austenitic stainless steel grade with higher carbon content than TP304, offering improved creep resistance and mechanical strength at elevated temperatures.

As a trusted manufacturer, Ganyeah Group produces ASTM A249 TP304H tubes strictly in accordance with the specification’s requirements for chemical composition, mechanical properties, heat treatment, and non-destructive testing. Our tubes are widely used in power generation, petrochemical, and industrial thermal systems.

Chemical Composition – TP304H

Element	Content (%)
Carbon (C)	0.04 – 0.10
Manganese (Mn)	≤2.00
Phosphorus (P)	≤0.045
Sulfur (S)	≤0.030
Silicon (Si)	≤1.00
Chromium (Cr)	18.0 – 20.0
Nickel (Ni)	8.0 – 11.0

Solution Heat Treatment Temperature: ≥1900℉ (1040℃)

The increased carbon content enhances the material’s high-temperature strength, making TP304H particularly suitable for long-term service in elevated temperature environments.

Mechanical Properties

Property	Value
Tensile Strength (min)	515 MPa
Yield Strength (min)	205 MPa
Elongation (min, in 2 in. / 50 mm)	35%
Rockwell Hardness (max)	B90
Vickers Hardness (max)	200

These mechanical values make TP304H ideal for pressure vessels and heat transfer equipment that must endure thermal fatigue and pressure fluctuations.

Manufacturing & Compliance (ASTM A249 Standard)

Ganyeah Group manufactures TP304H tubes in compliance with ASTM A249 requirements, which include:

Automatic welding without filler metal

Cold working of the weld area or the entire tube (as required)

Final solution annealing at ≥1040°C (1900°F)

Optional HCW (Heavily Cold Worked) finish for enhanced strength

Non-destructive testing: eddy current or air-under-water pressure test

Flattening, flange, reverse bend, and hardness testing before shipment

Available Sizes

As per ASTM A249, the standard dimensional range includes:

Inside Diameter: 1/8 inch (3.2 mm) and above

Outside Diameter: Up to 12 inches (304.8 mm)

Wall Thickness: 0.015 inch (0.4 mm) to 0.320 inch (8.1 mm)

Custom dimensions are available upon request, provided they meet all ASTM A249 criteria.

Key Features of TP304H

Excellent High-Temperature Strength: Maintains mechanical integrity at sustained elevated temperatures.

Creep Resistance: Higher carbon improves long-term resistance to creep deformation.

Corrosion Resistance: Performs well in oxidizing environments and non-chloride fluids.

Good Weldability: Despite its higher carbon content, it maintains solid weld characteristics.

Applications

According to ASTM A249 and based on its metallurgical properties, TP304H stainless steel tubes are ideally used in:

Boiler tubes in thermal power plants

Heat exchangers and superheaters in refineries and petrochemical plants

Furnace components in industrial heating systems

Air preheaters and economizers in energy recovery units

High-temperature process tubing in chemical industries

Not recommended for use in chloride-rich or seawater environments without proper material upgrade.

Why choose us?

With over 20 years of stainless steel tube manufacturing experience, Ganyeah Group delivers globally trusted piping solutions. We are committed to quality, consistency, and client satisfaction.

We have :
ISO 9001, CE, PED, SGS, BV Certified

In-house welding, annealing, and NDT facilities

Strict quality control and 3.1/3.2 test certificates

Fast delivery and global logistics support

Custom OEM services for engineering projects

Looking for a dependable supplier of ASTM A249 TP304H stainless steel welded tubes?
Ganyeah Group offers high-quality materials with competitive pricing and fast delivery.