Stainless Steel 347H Seamless Pipes
Stainless Steel 347H Seamless Pipes is a seamless pipe made from alloy steel containing stabilised niobium, designed to provide excellent stability at high temperatures. Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd., a trusted supplier from Chon Buri, offers years of expertise with advanced in-house pipe production. We offer a wide range of stainless steel pipes and maintain a reliable supply strength to serve both domestic and export markets. This page provides detailed specifications, chemical and mechanical properties, types of 347H seamless pipes, and an overview of our seamless pipe manufacturing process.
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Product Overview: Stainless Steel 347H Seamless Pipes
347H Stainless Steel is an austenitic, columbium-stabilised stainless steel grade specifically designed to offer excellent resistance to high-temperature oxidation. It is a high-carbon variant, making it suitable for elevated temperature service where sustained heating and pressure are present. It exhibits enhanced creep strength and superior structural stability, particularly in environments exceeding 1000°F (538°C). The addition of columbium (niobium) not only stabilises the alloy against chromium carbide precipitation but also improves its weldability and mechanical performance under stress.
Stainless Steel 347h Seamless Pipes is widely used in heat exchangers, chemical processing, petroleum refining, and power generation due to its outstanding thermal and corrosion resistance. The seamless construction ensures uniform strength, leak-proof performance and compatibility with fluid transport applications. These pipes are manufactured using strict quality controls and advanced technology in a state-of-the-art facility located in Chon Buri, Thailand, where they are also consistently stocked for timely delivery.
Why Choose Our Stainless Steel 347H Seamless Pipes?
As a leading manufacturer of 347h stainless steel seamless pipe, we deliver exceptional quality, reliability and performance. Our pipes are known for their excellent high-temperature strength, superior corrosion resistance and precise dimensional accuracy. With advanced manufacturing processes, strict quality controls nd fast delivery options our seamless pipes provide superior value compared to competitors, ensuring lasting durability in even the most demanding industrial environments.
Competitive Pricing
Global Exports Expertise
Large Inventory & Fast Dispatch
Custom Sizes & Finishes
Industry Certifications & Compliance
Advanced Production Technology
After-Sales Support, Service- Technical Support
In-House Testing & Full Traceability
ASTM A312 TP347H Seamless Pipes Specification
This section provides a detailed overview of the various specifications for ASTM A312 TP347H Seamless Pipes, ensuring precise compliance with industry standards. Key technical parameters, including size range, dimensions, and wall thickness, are outlined for reference.
| Specifications | ASTM A312 / ASME SA312 |
|---|---|
| Sizes (Seamless) | 1/2" NB - 24" NB |
| Wall Thickness Available | Schedule 5S - Schedule XXS (heavier on request) |
| Other Materials Testing | NACE MR0175, H2 SERVICE, OXYGEN SERVICE, CRYO SERVICE, etc. |
| Dimensions | All pipes are manufactured and inspected/tested to relevant standards including ASTM, ASME, and API, etc. |
Chemical Composition of Stainless Steel 347H Seamless Pipes
Understand the chemical composition of 347H stainless steel, essential for its superior performance in high-temperature environments. This section breaks down the key elements that contribute to its unique properties.
| Grade | C | Cr | Ni | Mn | P | S | Si | Other |
|---|---|---|---|---|---|---|---|---|
| 347H | 0.04–0.10 | 17.00–19.00 | 9.00–13.00 | ≤2.00 | ≤0.035 | ≤0.030 | ≤1.00 | Nb ≥ 8×C% |
Mechanical Properties of Stainless Steel 347H Seamless Pipes
Below are the mechanical properties of stainless steel UNS S34709 pipes, such as tensile strength, yield strength, elongation, and more.
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | Rockwell B (HR B) max | Brinell (HB) max |
|---|---|---|---|---|---|---|
| 347H | 515 | 205 | 40 | 92 | 201 |
Manufacturing Process of Stainless Steel 347H Seamless Pipes
There are 5 steps involved in the stainless steel 1.4961 pipe manufacturing process, which are given below. We follow a professional and precise manufacturing process to deliver high-quality products.
1. Raw Material SELECTION
High-quality stainless steel billets and strips are carefully selected for superior strength and corrosion resistance.
2. Pipes Formation
The selected raw material is formed into pipes using seamless extrusion methods, depending on the application.
3. Heat Treatment
Pipes undergo required controlled heat treatment to enhance mechanical properties and relieve internal stresses.
4. Cold Working and Finishing
After heat treatment, pipes are cold-worked for better surface finish, dimensional accuracy and improved strength.
5. Quality Control and Testing
Every pipe is thoroughly inspected and tested to ensure it meets international quality standards for performance and reliability.
Applications of Stainless Steel 347H Seamless Pipes
Stainless Steel 347H Seamless Pipes are widely used in the power generation and petrochemical industries, which represent the highest demand sectors for these pipes. They are essential components in boilers, heat exchangers, superheaters, and furnace parts, where they operate under high temperatures and pressure. Their excellent resistance to stress corrosion cracking and oxidation at elevated temperatures makes them reliable for steam handling and hot gas transfer in thermal power plants and refineries. These pipes are used in chemical processing plants for transporting aggressive fluids, where material stability and durability are critical for safety and efficiency.
Oil and Gas Industry
Chemical and Petrochemical Industry
Food and Beverage Industry
Pharmaceutical & Biotechnology
Aerospace & Defense
Automotive and Transportation
Construction and Architecture
Marine & Shipbuilding
Power Generation & Heat Exchange
Available Stock of ASTM A312 Stainless Steel 347 Pipes
We maintain a ready stock of ASTM A312 / A312 Stainless Steel 347 Pipes at our Chon Buri facility for prompt local dispatch. All 347 and 321 stainless steel seamless pipes are marked with trademark, grade, size, and lot number for complete traceability. Secure packaging ensures damage-free delivery to domestic and export destinations.
FAQ's
What are the common standards and specifications for Stainless Steel 347H Seamless Pipes?
What are the common standards and specifications for Stainless Steel 347H Seamless Pipes?
Stainless Steel 347H Pipes are manufactured in compliance with international standards ASTM A312 / ASME SA312 TP 347H, ensuring exceptional performance and reliability in demanding environments. These pipes are available in seamless, welded, and EFW (Electric Fusion Welded) forms to suit diverse industrial applications. The seamless pipes come in outer diameters ranging from 4 mm to 219 mm with wall thicknesses between 0.5 mm and 20 mm, while the welded and EFW pipes are offered in sizes ranging from 5.0 mm to 1219.2 mm, delivering consistent quality and durability across all variants
What industries commonly use Stainless Steel 347H Seamless Pipes?
What industries commonly use Stainless Steel 347H Seamless Pipes?
Stainless Steel 347H Seamless Pipes are commonly used in industries that operate under high-temperature and corrosive conditions. These include the petrochemical, chemical processing, oil and gas, power generation, pharmaceutical, food processing, and heat exchanger industries. Their excellent resistance to intergranular corrosion and high creep strength make them ideal for applications such as boilers, superheaters, and furnace components.
Can Thaida provide customized Stainless Steel 347H Seamless Pipes?
Can Thaida provide customized Stainless Steel 347H Seamless Pipes?
Yes, Thaida can provide customized Stainless Steel 347H Seamless Pipes based on specific client requirements. We offer customization in sizes, wall thickness, lengths, and finishes to meet various industrial standards and project needs. This ensures that customers receive pipes perfectly suited for their applications in demanding environments.
What is the difference between 347 and 347h?
What is the difference between 347 and 347h?
Both SS 347 and SS 347H are columbium-stabilized austenitic stainless steels that offer excellent resistance to intergranular corrosion and oxidation at high temperatures. The primary distinction is that SS 347H has a higher carbon content, giving it superior tensile strength, creep resistance, and stress rupture properties for demanding elevated-temperature applications (up to 1700°F). Due to these enhanced mechanical properties, SS 347H is generally more expensive than standard SS 347.
What is the composition of 347h stainless steel?
What is the composition of 347h stainless steel?
Stainless Steel 347H is an austenitic chromium-nickel alloy stabilized with columbium (niobium). It contains 17–19% chromium, 9–13% nickel, and a higher carbon content (up to 0.10%) for improved high-temperature strength. The addition of niobium enhances resistance to intergranular corrosion, while its balanced composition provides excellent creep strength and oxidation resistance under elevated temperatures.
What is the temperature range for 347H?
What is the temperature range for 347H?
Stainless Steel 347H is designed for high-temperature applications and performs well in the temperature range of up to 1500°F (816°C). It can also handle intermittent service temperatures up to around 1650°F (900°C) without losing its mechanical strength or resistance to oxidation. Because of its niobium stabilization and higher carbon content, 347H maintains excellent creep and stress rupture properties at elevated temperatures, making it ideal for boilers, heat exchangers, and furnace parts.
What are the properties of 347H stainless steel?
What are the properties of 347H stainless steel?
Stainless Steel 347H offers excellent high-temperature strength, corrosion resistance, and durability, making it suitable for demanding environments. It maintains toughness up to 816°C, resists intergranular corrosion through niobium stabilization, and provides reliable creep and oxidation resistance. With good weldability and formability, it is widely used in heat exchangers, boiler tubes, and other high-temperature equipment.