What is ASTM A312 TP304H
ASTM A312 TP304H stainless steel pipe is a high carbon version of 304 stainless steel, specifically developed for high-temperature and high-pressure service applications. With increased carbon content (0.04–0.10%), TP304H provides enhanced creep strength and improved mechanical performance at elevated temperatures, making it ideal for boilers, superheaters, heat exchangers, and pressure vessels.
Compared with standard TP304 and TP304L stainless steel pipes, ASTM A312 TP304H offers better long-term thermal stability and strength under continuous high-temperature exposure, while maintaining excellent corrosion resistance. As a reliable TP304H pipe supplier, we provide seamless and welded pipes in full specifications, manufactured in compliance with ASTM A312 / ASME SA312 standards, ensuring stable quality and fast global delivery.
Chemical Composition
| Element | Content |
|---|---|
| C | 0.04 – 0.10 |
| Mn | ≤ 2.00 |
| Si | ≤ 1.00 |
| Cr | 18.0 – 20.0 |
| Ni | 8.0 – 11.0 |
| P | ≤ 0.045 |
| S | ≤ 0.030 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 201 HB |
Specifications & Dimensions
| Parameter | Metric | Imperial |
|---|---|---|
| Outer Diameter | 6 mm – 610 mm | 1/8" – 24" |
| Wall Thickness | 0.5 mm – 50 mm | SCH 5S – SCH XXS |
| Length | 5.8m / 6m / 11.8m / 12m | 20ft / 40ft |
| Type | Seamless / Welded / EFW | - |
| Standard | ASTM A312 | ASME SA312 |
Key Features & Advantages
Enhanced creep strength at high temperatures
Excellent mechanical stability under thermal stress
Good oxidation resistance
Cost-effective solution compared to higher alloy grades
Suitable for long-term high-temperature service
Applications
ASTM A312 TP304H pipes are widely used in:
Power Plant Boilers
Superheaters & Reheaters
Heat Exchangers
Pressure Vessels
Oil & Gas Processing Systems
ASTM A312 TP304H vs TP304 vs TP304L vs TP347H
| Grade | Key Feature | Best Application |
|---|---|---|
| TP304H | Higher carbon → better creep strength | High-temperature service |
| TP304 | Standard grade | General purpose |
| TP304L | Low carbon → better weldability | Corrosion-sensitive environments |
| TP347H | Nb stabilized + high carbon | Extreme high-temp boilers |
Inspection & Quality Assurance
100% PMI Testing
Hydrostatic Testing / Eddy Current Testing
Ultrasonic Testing (UT)
Mechanical & Chemical Analysis
Third-party inspection: SGS / BV / TUV
Product Delivery Standards
Export seaworthy packaging (wooden cases / bundles)
Plastic caps for pipe protection
Clear marking (Grade / Size / Heat No.)
Delivery time: 7–25 days
Worldwide shipping capability
Why Choose Our TP304H Pipes
Factory direct pricing
Full size availability
Fast delivery for urgent projects
Rich export experience
Technical support for engineering applications
FAQ
What is ASTM A312 TP304H used for?
TP304H is used in high-temperature applications such as boilers, superheaters, and pressure vessels.
What is the difference between 304 and 304H?
304H has higher carbon content, which improves creep strength and high-temperature performance.
Is TP304H better than TP304L?
For high-temperature service, TP304H is better. For welding and corrosion resistance, TP304L is preferred.
Can TP304H be used in high-pressure systems?
Yes, TP304H is suitable for high-pressure and high-temperature environments.
Contact Us
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