Henan TOM Intelligent Technology Co., Ltd. is a dedicated manufacturer of stainless steel pipe and duplex stainless steel pipe (304/L, 316/L, 317L, 321, 310S, duplex 2205 and super duplex 2507) to ASTM A312, A789, A790 and A213. Our integrated mill covers steelmaking, hot piercing, cold drawing, solution annealing and machining under one roof, with annual capacity exceeding 3500000 tons and a size range from 1/2″ to 48″ (seamless to 24″, welded/EFW to 110″). Quality is assured by ISO 9001, PED 2014/68/EU and CE certification, supported by EN 10204 3.1 mill certificates, third-party inspection (SGS/BV/TÜV) and NACE MR0175 / ISO 15156 compliance on request.
Product Overview
A312 TP347H Stainless Steel Seamless Pipe is a niobium-stabilized austenitic stainless steel pipe designed for high-temperature and corrosive service. The material is identified as UNS S34709. Its niobium stabilization helps reduce sensitization and intergranular corrosion, while the H-grade is intended for service where creep and stress-rupture properties are important.
TP347H is widely considered for petrochemical plants, refineries, power generation, heat exchangers, steam piping, furnace components and other high-temperature process systems.
Specifications
|
Item |
Specification |
|
Product Name |
ASTM A312 TP347H Stainless Steel Pipe |
|
Grade |
TP347H |
|
UNS |
S34709 |
|
Material |
Austenitic Stainless Steel |
|
Standard |
ASTM A312 / ASME SA312 |
|
Manufacturing |
Seamless / Welded |
|
Dimension Standard |
ASME B36.19M |
|
Common Size Range |
NPS 1/8"–24" for seamless pipe |
|
Wall Thickness |
According to size, schedule and project requirements |
|
Schedule |
5S, 10S, 40S, 80S, 160, XXS and others |
|
Length |
Random, fixed or customized |
|
Ends |
Plain, beveled, threaded or customized |
|
Surface |
Annealed & Pickled, Bright Annealed or customized |
|
Heat Treatment |
Solution Heat Treatment |
|
Application |
High-temperature and corrosive service |
Chemical Composition
|
Element |
TP347H Requirement |
|
Carbon (C) |
0.04–0.10% |
|
Manganese (Mn) |
≤ 2.00% |
|
Silicon (Si) |
≤ 1.00% |
|
Phosphorus (P) |
≤ 0.045% |
|
Sulfur (S) |
≤ 0.030% |
|
Chromium (Cr) |
17.0–19.0% |
|
Nickel (Ni) |
9.0–13.0% |
Mechanical Properties
|
Property |
TP347H |
|
Tensile Strength, Min. |
515 MPa / 75 ksi |
|
Yield Strength, Min. |
205 MPa / 30 ksi |
|
Elongation, Min. |
40% |
|
Hardness |
According to applicable specification |
Why Choose ASTM A312 TP347H?
High-Temperature Performance – Suitable for demanding elevated-temperature service.
Niobium Stabilized – Helps reduce chromium carbide precipitation and associated intergranular corrosion.
Good Creep Strength – H-grade chemistry is intended for applications requiring creep and stress-rupture performance.
Good Corrosion Resistance – Chromium and nickel provide corrosion resistance for many industrial environments.
Reliable Mechanical Strength – Minimum tensile strength 515 MPa and minimum yield strength 205 MPa.
Good Fabrication Performance – Suitable for standard fabrication processes when properly specified.
Broad Industrial Use – Suitable for petrochemical, refinery, power and heat-transfer applications.
Manufacturing Process
Stainless Steel Billet → Heating → Piercing → Hot Rolling → Sizing → Solution Heat Treatment → Straightening → Surface Inspection → Dimensional Inspection → Testing → Marking → Packing
For welded pipe, the production route differs and may include forming, welding, heat treatment and subsequent inspection according to the applicable specification.
Applications
Petrochemical Plants
Oil Refineries
Power Generation
High-Temperature Steam Piping
Heat Exchangers
Boiler Systems
Superheater Systems
Furnace Components
Chemical Processing Equipment
High-Temperature Process Piping
Exhaust and Thermal Systems
ASTM A312 TP347H Stainless Steel Pipe – Application Case
A petrochemical customer found that its high-temperature piping was experiencing thermal stress and corrosion concerns during repeated heating and cooling cycles. We recommended ASTM A312 TP347Hstainless steel pipe, focusing on its high-temperature strength and suitability for creep and stress-rupture sevice.
After solution heat treatment, dimensional inspection and strict quality testing, the pipe was supplied for the replacement project, providing a more reliable solution for the customer's high-temperature process piping system.
Everything You Need to Know
Is TP347H suitable for high-temperature applications?
Yes. ASTM A312 identifies TP347H among grades intended for service where creep and stress-rupture properties are important.
What is the difference between 347 and 347H?
TP347H has a higher carbon range and is designed for improved high-temperature creep and stress-rupture performance.
What standard covers TP347H stainless steel pipe?
ASTM A312 / ASME SA312 for stainless steel pipe. TP347H may also be supplied under ASTM A213 / ASME SA213 for applicable boiler, superheater and heat-exchanger tube applications.
304 stainless steel meets the international requirements of food grade,316 stainless steel is not only food grade or medical grade. However,the use of this medical grade as a production cup will not bring additional benefits to everyone. Why is it called 304 or 316? This is mainly defined according to the material composition. 316 stainless steel is not similar to mineral materials,after use can release some substances to promote human absorption,will not purify water quality,so when used as a water cup material,there is no difference. The difference is that the price of raw materials is different from the size of the sound of the long stunt.
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