Products Description
Our Advantages
1. High Temperature Resistance
- TP347 exhibits excellent high-temperature stability, suitable for temperatures ranging from 797-1598°F (425–870°C). Compared to 304/304L stainless steel, 347 Stainless Steel Pipe resists intergranular corrosion in high-temperature environments.
- Our pipes are seamless tubes manufactured using a cold drawing process and undergo high-temperature resistance testing to ensure excellent mechanical strength in high-temperature applications.
2. Excellent Welding Performance
- 347 Stainless Steel Pipe is suitable for all standard welding processes and requires no heat treatment after welding, making it the preferred material for high-temperature, high-pressure, and critical piping systems.
- Our pipes undergo metallographic examination and intergranular corrosion testing to ensure they can resist intergranular corrosion after welding.
3. High Pressure Resistance
- Our pipes are manufactured using hot extrusion and cold drawing processes, resulting in uniform wall thickness. Compared to welded pipes, they have no weld seam weaknesses, offering stronger pressure resistance and higher safety performance.
- The pipes undergo eddy current testing, ultrasonic testing, and hydrostatic testing to ensure that the pipe surface is free of cracks, inclusions, and other defects, meeting ASTM A312 standard specifications.
4. Surface Treatment
- The pipes undergo pickling and passivation treatment, resulting in a clean surface free of oil and scale, which enhances the corrosion resistance of the pipes and extends their service life in chemical environments.
- We offer customized surface treatments, including polishing, sandblasting, or PVC epoxy resin or anti-corrosion coatings according to customer requirements.
5. Flexible Customization and Packaging
- We provide customized size specifications and can manufacture according to international standards required by customers; we also offer processing services such as bending, flaring, tapping, or cutting.
- We provide packaging options such as plastic end caps, plastic film, woven bags, wooden crates, and iron frames to prevent damage to the pipes during transportation.
application areas
- Oil and Gas: Used in high-temperature process piping, catalytic cracking units, and hydrogen service systems, etc.
- Petrochemical and Chemical Processing Plants: Used in reactors, pipelines, and heat exchangers.
- Power Generation Systems: Superheaters, reheaters, main steam lines, and high-pressure boiler components.
- Aerospace: Used in auxiliary lines for conveying engine fuel, hydraulic fluid, and high-temperature exhaust, etc.
Chemical Composition
| Element | C (%) | Cr (%) | Ni (%) | Nb (%) | Mn (%) | Si (%) | P (%) | S (%) |
|---|---|---|---|---|---|---|---|---|
| TP347 | ≤ 0.08 | 17.0 – 19.0 | 9.0 – 13.0 | ≥ 10×C | ≤ 2.00 | ≤ 1.00 | ≤ 0.045 | ≤ 0.030 |
| TP347H | 0.04 – 0.10 | 17.0 – 19.0 | 9.0 – 13.0 | ≥ 10×C | ≤ 2.00 | ≤ 1.00 | ≤ 0.045 | ≤ 0.030 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation (%) | Hardness (HB) |
| TP347 | ≥ 515 | ≥ 205 | ≥ 35 | ≤ 95 HRB |
| TP347H | ≥ 515 | ≥ 205 | ≥ 35 | ≤ 95 HRB |
Possible Alternative Grades
| Alternative Grades | Reasons |
| TP304 / TP304H | Suitable for general high-temperature environments requiring low corrosion resistance. |
| TP316 / TP316H | Offers better resistance to chlorides and pitting corrosion. |
| TP321 / TP321H | Exhibits good resistance to intergranular corrosion after welding, and is commonly used in high-temperature welded piping systems. |
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Can TP347 pipes withstand high temperatures and pressures?
A: TP347 exhibits excellent high-temperature stability, maintaining mechanical strength, ductility, and corrosion resistance in the temperature range of 797-1598°F.
Q: Is TP347 suitable for welding and processing?
A: In most cases, TP347 can be welded using TIG welding, MIG welding, or arc welding without post-weld heat treatment.
Q: How does TP347 differ from standard 304 or 316 stainless steel?
A: TP347 prevents the formation of chromium carbides at grain boundaries during welding or high-temperature use. It offers superior resistance to intergranular corrosion compared to 304 or 316 stainless steel.
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