ASTM A312 TP347H stainless steel pipe is a high-performance austenitic alloy specifically engineered for high-temperature and high-pressure service applications. As a stabilized grade with added niobium (Nb), TP347H offers excellent resistance to intergranular corrosion, superior creep strength, and outstanding oxidation resistance, making it the preferred material for boilers, superheaters, heat exchangers, and petrochemical systems.
Compared with standard TP347 and TP321 stainless steel pipes, ASTM A312 TP347H features a higher carbon content, which significantly enhances its long-term thermal stability and creep resistance in elevated temperature environments above 800°C. This makes it widely used in power plants, oil refineries, and high-temperature process industries where material reliability is critical.
As a professional ASTM A312 TP347H pipe supplier, we provide seamless and welded pipes in full size ranges, compliant with ASME SA312 standards, ensuring strict quality control, global export capability, and fast delivery for industrial projects worldwide.
Chemical Composition
| Element | Content |
|---|---|
| C | 0.04 – 0.10 |
| Mn | ≤ 2.00 |
| Si | ≤ 1.00 |
| Cr | 17.0 – 19.0 |
| Ni | 9.0 – 13.0 |
| Nb (Cb) | ≥ 10×C to 1.0 |
| 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 | Range |
|---|---|
| Outer Diameter | 6 mm – 610 mm (1/8" – 24") |
| Wall Thickness | SCH 5S – SCH XXS (0.5 mm – 50 mm) |
| Length | 5.8m / 6m / 11.8m / 12m / Custom |
| Type | Seamless / Welded / EFW |
| End Type | Plain End / Beveled End / Threaded |
Tolerance Standards:
According to ASTM A312 / ASME SA312 / ANSI B36.19
Key Features & Advantages
Excellent creep resistance at high temperatures
Superior oxidation resistance up to 870°C+
Stabilized with niobium (Nb) to prevent sensitization
Strong intergranular corrosion resistance
Ideal for long-term thermal service applications
Applications
ASTM A312 TP347H pipes are widely used in:
Power Plant Boilers & Superheaters
Petrochemical Processing Equipment
Oil & Gas Refinery Pipelines
Heat Exchangers & Condensers
High-Pressure Steam Systems
ASTM A312 TP347H vs TP347 vs TP321
| Grade | Key Difference | Best Use |
|---|---|---|
| TP347H | Higher carbon → better creep strength | High-temp boilers |
| TP347 | Standard stabilized grade | General corrosion resistance |
| TP321 | Titanium stabilized | Medium temperature applications |
Inspection & Quality Assurance
We ensure strict quality control through:
100% PMI (Positive Material Identification)
Hydrostatic Testing / Eddy Current Testing
Ultrasonic Testing (UT)
Mechanical & Chemical Testing
Third-party inspection: SGS / TUV / BV
All products comply with ASTM / ASME international standards and are fully traceable.
Product Delivery Standards
Standard export seaworthy packing (wooden cases / bundles)
Plastic caps for pipe ends protection
Marking: Grade / Size / Heat No. / Standard
Delivery Time: 7–25 days depending on quantity
Global shipping: Middle East / Europe / Southeast Asia / America
Why Choose Our TP347H Pipes
Factory direct price with stable supply
Full range sizes & custom production
Rich export experience in high-temperature alloys
Fast response & technical support
Certified quality with international inspection
FAQ
What is ASTM A312 TP347H used for?
TP347H is mainly used in high-temperature and high-pressure environments such as boilers, superheaters, and petrochemical systems.
What is the difference between TP347 and TP347H?
TP347H contains higher carbon content, which improves creep strength and high-temperature performance.
Is TP347H better than TP321?
For high-temperature applications, TP347H offers better creep resistance, while TP321 is more suitable for moderate temperatures.
Can TP347H withstand high pressure?
Yes, TP347H is designed for high-pressure and high-temperature service, especially in power generation industries.
Contact Us
Looking for a reliable ASTM A312 TP347H stainless steel pipe supplier?
Send us your inquiry today including:
Size (OD × WT)
Quantity
Application
Destination port
We will provide fast quotation + technical support + best export solution.
+8615769214734
office@dongmjd.com
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