ASTM A312 TP347H Stainless Steel Pipe

Stainless Steel Pipe Supplier | ASTM A312 TP347H Pipe Manufacturer

Professional Stainless Steel Pipe Supplier from China

ASTM A312 TP347H is a stabilized austenitic stainless steel containing niobium (columbium) and tantalum to improve resistance to intergranular corrosion after exposure to high temperatures. The “H” grade specifies higher carbon content, which enhances creep resistance and strength at elevated temperatures compared to standard TP347.

These pipes are manufactured through seamless or welded processes, meeting the strict dimensional and mechanical requirements of ASTM A312. With excellent resistance to oxidation, carburization, and high-temperature scaling, TP347H is particularly suitable for service in environments above 600°C.

We supply TP347H stainless steel pipes in different sizes, schedules, and surface finishes, with heat treatment certificates, EN 10204/3.1 mill test reports, and third-party inspections available upon request.

Technical Parameters

Mechanical Properties (Typical)

Chemical Composition (Typical, %)

Product Features

• High-Temperature Strength – Designed for service at 600–1000°C.

• Stabilized Structure – Niobium/tantalum prevents carbide precipitation.

• Creep Resistance – “H” grade carbon content ensures long-term stability under stress.

• Excellent Corrosion Resistance – Withstands intergranular corrosion, oxidation, and scaling.

• Versatile Manufacturing Options – Available in seamless and welded forms.

• Compliance – Meets ASTM, ASME, and international standards.

Application Areas

• Power Plants – Boiler tubes, superheaters, reheaters, steam pipelines.

• Petrochemical Industry – Furnace tubes, catalytic reformers, refinery piping.

• Heat Exchangers – High-temperature heat transfer equipment.

• Aerospace & Marine – High-heat structural piping and exhaust systems.

• Chemical Processing – Pipelines handling high-temperature corrosive fluids.

How to Choose TP347H Stainless Steel Pipe

1. Determine Service Temperature – Choose TP347H for continuous service above 600°C.

2. Select Pipe Type – Seamless for high-pressure systems, welded for general industrial use.

3. Choose Wall Thickness (Schedule) – SCH 10S to SCH 160 depending on pressure rating.

4. Check Certification Needs – EN 10204/3.1 MTC, PED, or third-party inspection.

5. Surface Finish – Pickled/annealed for industrial, polished for hygiene-critical use.

FAQ

Q1: What is the difference between TP347 and TP347H stainless steel pipe?
A: TP347H has a higher carbon content than TP347, providing superior creep strength and high-temperature resistance.

Q2: Is TP347H suitable for marine environments?
A: While it has good corrosion resistance, for chloride-rich marine environments, duplex or super austenitic stainless steels may perform better.

Q3: What delivery condition do you provide?
A: Pipes are usually solution-annealed and pickled, supplied in plain or beveled ends.

Q4: What standards do TP347H pipes comply with?
A: They comply with ASTM A312, ASME SA312, and equivalent EN/GB standards.

Q5: Can TP347H pipes be welded?
A: Yes, they can be welded using GTAW/TIG, SMAW, or SAW with suitable filler metals.