What is ASTM A312 TP347
ASTM A312 TP347 stainless steel pipe is a niobium-stabilized austenitic stainless steel pipe designed for corrosion-resistant and high-temperature applications. By adding niobium (Nb), TP347 effectively prevents chromium carbide precipitation, ensuring excellent resistance to intergranular corrosion, particularly after welding or prolonged exposure to elevated temperatures.
Compared with conventional grades such as TP304 and TP316 stainless steel pipes, ASTM A312 TP347 provides enhanced thermal stability and oxidation resistance, making it ideal for heat exchangers, refinery piping systems, and chemical processing equipment. As a reliable ASTM A312 TP347 pipe supplier, we offer full-size seamless and welded pipes, compliant with ASME SA312 standards, ensuring consistent quality and global delivery.
Chemical Composition
| Element | Content |
|---|---|
| C | ≤ 0.08 |
| 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 | 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 | - |
| Tolerance | ASTM A312 | ANSI B36.19 |
Key Features & Advantages
Excellent intergranular corrosion resistance
Superior weldability without post-weld annealing
Strong oxidation resistance in high-temperature environments
Stabilized structure prevents sensitization
Suitable for continuous thermal exposure applications
Applications
ASTM A312 TP347 pipes are widely used in:
Heat Exchangers
Chemical Processing Equipment
Oil & Gas Pipelines
Fertilizer Industry Systems
Pressure Vessels
ASTM A312 TP347 vs TP347H vs TP321
| Grade | Key Feature | Best Application |
|---|---|---|
| TP347 | Nb stabilized, corrosion resistant | General high-temp use |
| TP347H | Higher carbon, better creep strength | Boilers & superheaters |
| TP321 | Ti stabilized | Medium temperature service |
Inspection & Quality Assurance
Our TP347 stainless steel pipes undergo strict inspection:
PMI Testing (100%)
Hydrostatic / Eddy Current Testing
Ultrasonic Testing (UT)
Mechanical & Chemical Analysis
Third-party inspection: SGS / BV / TUV
Product Delivery Standards
Export seaworthy packaging (wooden case / bundle)
End protection with plastic caps
Full marking & traceability
Delivery time: 7–25 days
Global shipping support
Why Choose Our ASTM A312 TP347 Pipes
Factory direct pricing
Full size inventory
Fast delivery worldwide
Professional export experience
Technical support for project bidding
FAQ
What is ASTM A312 TP347 used for?
It is used in heat exchangers, chemical processing, and high-temperature piping systems requiring corrosion resistance.
What makes TP347 different from 304?
TP347 contains niobium, which prevents intergranular corrosion after welding, unlike 304.
Is TP347 better than TP321?
TP347 provides better resistance to intergranular corrosion, while TP321 is more suitable for moderate temperature environments.
Can TP347 be used for high-temperature applications?
Yes, TP347 is designed for continuous high-temperature service, especially in industrial systems.
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