347 SS Seamless Pipes Manufacturer and Supplier in Thailand

SS 347 Seamless Pipes is a premium austenitic stainless steel pipe designed to offer excellent resistance to intergranular corrosion and reliable performance at elevated temperatures. Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd., based in Chon Buri, has years of experience and expertise in delivering pipes for demanding industrial applications. These pipes are ideal for use in high-pressure and high-temperature environments, making them suitable for industries such as petrochemical, chemical processing, and power generation. With a strong focus on precision engineering, international standards, and customer satisfaction, we ensure that every SS 347 seamless pipe meets the highest expectations in terms of durability, strength, and long-term performance across critical applications.

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Product Overview : Stainless Steel 347 Seamless Pipes

Stainless Steel 347 Seamless Pipes (UNS S34700) is an austenitic stainless steel known for its excellent resistance to intergranular corrosion, even after exposure to temperatures in the chromium carbide precipitation range. Its high-temperature strength, superior creep resistance, and durability makes it ideal for demanding applications up to 800 degrees Celsius. The addition of chromium and molybdenum enhances its mechanical and chemical properties, allowing reliable performance in both high-heat and cryogenic conditions. Available in sizes ranging from 1/2 inches to 24 inches and thicknesses from 0.4mm to 30mm, with custom lengths from 118″ to 48″, this pipe is widely used in various industries. We offer consistent quality and precision manufacturing to meet international standards. For more information, technical assistance, or to place an order, please contact our team today.

Key Benefits of Stainless Steel 347 Seamless Pipes

The following highlights six key benefits of our stainless steel TP 347 seamless pipes, including features like precision & smooth finish, application versatility, weld-free construction etc.

Stainless Steel 347 Seamless Pipes can withstand extreme heat conditions, maintaining strength and stability. This makes them ideal for boilers, heat exchangers, and other high-heat applications.

Designed to perform in aggressive and corrosive environments, these pipes offer long-term resistance against oxidation, chemicals and intergranular corrosion.

With robust mechanical properties, Stainless Steel 347 Seamless Pipes are capable of handling high pressures and mechanical loads without compromising performance.

The absence of welds eliminates weak spots, offering improved reliability, structural strength, and a longer service life under cyclic loading.

Their smooth interior finish allows for efficient fluid flow, making them perfect for sanitary and precision-based systems.

Used across diverse industries including chemical processing, aerospace, oil & gas, and food processing, these pipes offer dependable performance in critical applications.

Why Choose Thaida for Your 347 Stainless Steel Seamless Pipes Needs?

We are a reliable and experienced manufacturer of 347 Stainless Steel Seamless Pipes, known for delivering high-quality products with precision and consistency. With advanced tools and in-house capabilities, we offer pipes in a wide size range from 1/2 inches to 24 inches and thicknesses up to 30mm. Customers benefit from factory-direct pricing, quick turnaround, and customized service to meet specific project requirements. Our commitment to quality, accuracy and customer satisfaction makes it a preferred choice for stainless steel piping solutions.

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Specification Chart of TP347 Stainless Steel Seamless Pipes

This Stainless Steel 347 Seamless Pipes Specifications section includes grade, sizes (EFW), sizes (Seamless), and dimensions details.

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 347 Stainless Steel Seamless Pipes

The chemical composition table shows the elemental breakdown for stainless steel 347 seamless pipes, including carbon, chromium, and nickel.

Grade	C	Cr	Ni	Mn	P	S	Si	Other
347	≤0.08	17.00–19.00	9.00–13.00	≤2.00	≤0.035	≤0.030	≤1.00	Nb ≥ 10×C%

Stainless Steel 347 Seamless Pipes Mechanical Properties

Below are the mechanical properties of stainless steel 1.4550 pipes, such as tensile strength, yield strength, elongation, and more.

Elongation at break (%)	Hardness - Brinell	Izod impact strength (J·m⁻¹)	Modulus of elasticity (GPa)	Tensile strength (MPa)
<60	160–190	20–136	190–210	520–1100

Equivalent Material of Stainless Steel 347 Seamless Pipes

Stainless steel 347 seamless pipe’s equivalent table includes international material codes, UNS numbers, and EN grades.

STANDARD	UNS	WERKSTOFF NR.	EN
SS 347	S34700	1.4550	X6CrNiNb18-10

Stainless steel 347 Seamless Pipes Manufacturing Process

The manufacturing of stainless steel 1.4550 seamless pipes follows a five-step process, ensuring compliance with industry standards.

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 347 Seamless Pipes

Stainless steel 347 seamless pipes are primarily used in the power generation industry for high-pressure steam pipelines and boiler systems. Their ability to withstand elevated temperatures and resist intergranular corrosion makes them ideal for transporting superheated steam in thermal and nuclear power plants. In these settings, they ensure long-term performance and safety under high pressure and thermal stress. Apart from power plants, these pipes are also used in oil refineries for catalytic cracking units, in chemical plants for acid and heat transfer lines and in aerospace for exhaust ducts and manifolds where thermal stability is essential.

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

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FAQ's

How does Stainless Steel 347 Seamless Pipes differ from 321 or 316 pipes?

SS 347 and SS 321 are both stabilized austenitic stainless steels preferred for high-temperature applications, preventing intergranular corrosion; 347 uses niobium and is better for welding, while 321 uses titanium. In contrast, SS 316 is not a stabilized grade but offers superior general corrosion resistance, particularly against chlorides, due to its molybdenum content, making it suitable for marine and chemical environments.

Can Thaida provide custom lengths or finishes for Stainless Steel 347 Seamless Pipes?

Yes, Thaida offers customization for SS 347 seamless pipes, including options for specific lengths, wall thicknesses, and surface finishes. These customizations ensure the pipes meet precise project and customer requirements.

What industries commonly use Stainless Steel 347 Seamless Pipes?

Stainless Steel 347 seamless pipes are commonly used in industries that require high-temperature strength and excellent corrosion resistance, such as the chemical, petrochemical, and oil and gas sectors. They are also vital in power generation, for components like boilers and heat exchangers, and are used in the pharmaceutical and food and beverage industries due to their hygienic properties. Other applications include the aerospace and automotive industries and general construction.

How is Stainless Steel 347 Seamless Pipes manufactured compared to welded pipes?

Seamless 347 stainless steel pipes are manufactured by heating a solid billet and piercing it to form a hollow tube, resulting in a single, continuous piece without a seam. In contrast, welded 347 pipes are made by forming a flat steel coil or plate into a cylinder and then welding the seam together using processes like ERW, EFW, or DSAW. This fundamental difference in manufacturing creates variations in strength, pressure handling, and cost.

What is the material of 347 pipe?

Stainless Steel 347 pipes are austenitic alloys stabilized with niobium, which enhances corrosion resistance and prevents carbide precipitation at high temperatures. Comprising chromium (17–20%), nickel (9–13%), and niobium/tantalum, it offers excellent oxidation resistance, strength, and toughness, making it ideal for high-temperature and corrosive environments.

What is the difference between 347 and 316 stainless steel?

316 stainless steel offers excellent corrosion resistance, especially in chloride environments, making it ideal for marine and chemical applications. In contrast, 347 stainless steel provides superior strength and stability at high temperatures due to niobium stabilization, which prevents sensitization and intergranular corrosion. While 316 is more cost-effective, 347 is preferred for heat-intensive and welded structures like boilers and exhaust systems.

What is the difference between SS 347 and SS 347h?

The key difference between SS 347 and SS 347H lies in their carbon content, as both are columbium-stabilized for high-temperature applications. SS 347H contains higher carbon (0.04%–0.10%), providing greater strength and improved creep resistance under elevated temperatures. In contrast, standard SS 347, with a maximum of 0.08% carbon, is suitable for general high-temperature use but offers slightly lower strength compared to 347H.

What do you weld 347 stainless steel with?

347 stainless steel can be welded using standard methods such as TIG (GTAW), MIG (GMAW), SMAW, SAW, and resistance welding. The recommended filler metal is AWS E/ER347, which contains niobium to prevent intergranular corrosion. To maintain toughness and avoid hot cracking, control heat input and joint restraint. Oxyacetylene welding should be avoided due to the risk of carbon contamination.