SS 347 Seamless Tubes Manufacturer and Supplier in Thailand

Stainless Steel 347 Seamless Tubes are high-performance austenitic stainless steel tubes stabilized with niobium, making them ideal for high-temperature and corrosive environments. These tubes are widely used in industries that require resistance to intergranular corrosion and excellent mechanical strength. Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd., based in Chon Buri, is a trusted SS 347 seamless tubes supplier, specializing in top-quality tubes for diverse industrial needs. We offer grades TP347 and TP347H, available in sizes ranging from 1/8″ to 48″, with various thicknesses and custom cut-to-length services. Our tubes are produced using advanced techniques under strict ISO-certified processes, ensuring reliability and long-term performance. Compliant with ASTM A213, ASTM A269, and API 5L standards, Thaida’s SS 347 seamless tubes are the preferred choice for sectors like chemical processing, power generation, and aerospace.

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Product Overview: Stainless Steel 347 Seamless Tubes

Stainless Steel 347 Seamless Tubes are high-performance austenitic tubes stabilized with tantalum and columbium (niobium), offering excellent resistance to intergranular corrosion and superior strength at elevated temperatures. These tubes are ideal for high-temperature applications, maintaining structural integrity within the range of 800–1650°F (427–899°C). Manufactured to meet ASTM A213, ASTM A269, ASTM A312, ASME SA312 and ASME B36.24 standards, these tubes are available in sizes from 1/8″ to 48″ with varying wall thicknesses. Surface finishes include annealed, pickled, bright annealed and cold drawn, ensuring suitability for diverse industrial requirements. The inclusion of columbium (niobium) enhances the tube’s ability to withstand carbide precipitation, making it particularly effective in steel boiler and heat-exchanger tubes. Additionally, small diameter tubing options are available for specialized applications. Advanced manufacturing techniques like EDM and ECM ensure precision and quality in every tube produced.

Key Benefits Of Stainless Steel 347 Seamless Tubes

SS 347 seamless tubes offer key benefits that make them perfect for high-temperature and high-pressure applications.

Resists intergranular corrosion, making it ideal for chemical processing and marine applications.

Maintains strength and oxidation resistance up to 1650°F (899°C).

These tubes are easily weldable without post-weld heat treatment, facilitating fabrication in various industrial settings.

Retains non-magnetic properties in annealed condition, beneficial for applications requiring low magnetic permeability.

SS 347 seamless tubes offer high tensile and yield strength, ensuring durability under mechanical stress and high temperatures.

These tubes provide long service life with minimal maintenance, reducing downtime and operational costs.

Why Choose Our Stainless Steel 347 Seamless Tubes?

Thaida’s Stainless Steel 347 Seamless Tubes stand out for their dependable performance in extreme operating conditions. Manufactured in our modern facility in Chon Buri, Thailand, these tubes are specially designed for use in high-temperature services where resistance to intergranular corrosion is critical. We offer customized solutions with a wide variety of dimensions, ensuring precise fit and functionality for complex industrial systems. Backed by international standards like ASTM A213 and A269, our products guarantee strength, reliability, and compliance. With a strong focus on quality and timely supply, we combine technical expertise and decades of tube manufacturing experience to deliver seamless tubing.

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ASTM A269 TP 347 Seamless Tubes Specifications

This section provides detailed specifications for ASTM A269 TP 347 seamless tubes, including size ranges, wall thicknesses, manufacturing types (seamless), and sizes.

Specifications	ASTM A/ASME SA213 / ASTM A269
Sizes (Seamless)	1/2" NB - 24" NB
Wall Thickness	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 the relevant standards including ASTM, ASME, and API etc.

ASTM A269 TP 347 Seamless Tubes Chemical Composition

The table outlines the chemical composition of ASTM A269 TP 347 seamless tubes, detailing the percentages of elements such as chromium, nickel, carbon and others that define the alloy’s properties.

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%

Mechanical Properties Of 347 Stainless Steel Seamless Tubes

The mechanical properties of 347 stainless steel seamless tubes, including tensile strength, yield strength, elongation and hardness, which are critical for assessing performance under various conditions.

Element	Density	Melting Range	Tensile Stress	Yield Stress (0.2%Offset)	Elongation	Hardness (Brinell)
TP 347	8.0 g/cm3	1454 °C (2650 °F)	Psi - 75000 , MPa - 515	Psi - 30000 , MPa - 205	35 %	201

Equivalent of ASTM A269 TP 347 Stainless Steel Seamless Steel Tubes

This section lists equivalent grades and standards for these tubes, facilitating comparison and substitution across different specifications and international standards.

STANDARD	WERKSTOFF NR.	UNS
SS 347	1.4550	S34700

Stainless Steel 347 Seamless Tubes Dimensions

The detailed dimensions of ss 347 seamless tubes are provided including outer diameters, wall thicknesses and length options to assist in selecting the appropriate tube size for specific applications.

Nominal Pipes Size (NPS)	Outer Diameter (OD)	Schedule	Wall Thickness (mm)	Approx. Weight (kg/m)
1/4"	13.72 mm	SCH 40	2.24	0.64
1/2"	21.34 mm	SCH 40	2.77	1.27
3/4"	26.67 mm	SCH 40	2.87	1.65
1"	33.40 mm	SCH 40	3.38	2.45
1 1/2"	48.26 mm	SCH 40	3.68	4.40
2"	60.33 mm	SCH 40	3.91	5.61
3"	88.90 mm	SCH 40	5.49	11.29
4"	114.30 mm	SCH 40	6.02	16.07
6"	168.28 mm	SCH 40	7.11	28.26
8"	219.08 mm	SCH 40	8.18	43.39

Stainless Steel 347 Seamless Tubes Weight Chart

The range of outer diameters and their tolerances are given to ensure dimensional accuracy for different requirements.

OD (mm)	Wall Thickness (mm)	Weight (kg/m)
6.35	1.00	0.14
12.70	1.65	0.47
19.05	2.11	0.93
25.40	2.11	1.28
31.75	2.77	2.23
38.10	2.77	2.69
50.80	3.05	4.41
63.50	3.05	5.59
76.20	3.05	6.75
88.90	3.81	9.48
101.60	3.81	10.87
114.30	4.06	13.34
168.28	5.00	20.63
219.08	6.35	33.95

Stainless Steel 347 Seamless Tubes Size Chart

The size chart details the range of sizes available for ss 347 seamless tubes, including nominal sizes and corresponding dimensions for engineering requirements.

NB Sizes	SCH 5	SCH 10	SCH 40	SCH 80	SCH 160
1/8″	√	√	√	√	√
1/4″	√	√	√	√	√
3/8″	√	√	√	√	√
1/2″	√	√	√	√	√
3/4″	√	√	√	√	√
1″	√	√	√	√	√
1 1/4″	√	√	√	√	√
1 1/2″	√	√	√	√	√
2″	√	√	√	√	√
2 1/2″	√	√	√	√	√
3″	√	√	√	√	√
4″	√	√	√	√	√
5″	√	√	√	√	√
6″	√	√	√	√	√

Stainless Steel 347 Seamless Tubes of Manufacturing Process

Five main steps involved in stainless steel 347 seamless tube manufacturing process, each contributing to the product’s final quality. Each stage—from raw material selection to final inspection—is carefully controlled to ensure the tubes’ strength, durability and flawless finish, consistently meeting industry standards.

1. Raw Material Selection
High-quality stainless steel billets and strips are carefully selected for superior strength and corrosion resistance.

2. Tubes Formation
The selected raw material is formed into tubes using seamless extrusion methods, depending on the application.

3. Heat Treatment
Tubes undergo required controlled heat treatment to enhance mechanical properties and relieve internal stresses.

4. Cold Working and Finishing
After heat treatment, tube are cold-worked for better surface finish, dimensional accuracy and improved strength.

5. Quality Control and Testing
Every tube is thoroughly inspected and tested to ensure it meets international quality standards for performance and reliability.

Application of Stainless Steel 347 Seamless Tubes

Stainless Steel 347 Seamless Tubes are primarily used in the chemical and petrochemical industry, making it the highest-consuming sector due to their exceptional performance in high-temperature and corrosive environments. These tubes are widely used in heat exchangers, reactors, and piping systems where resistance to intergranular corrosion is essential. They are also utilized in thermal power plants for superheater and reheater tubing, and in aerospace exhaust manifolds due to their thermal stability. Additionally, SS 347 seamless tubes are found in refineries, furnace components, and fluid transport systems where both strength and oxidation resistance at elevated temperatures are critical.

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

What is 347 stainless steel tube used for?

347 stainless steel tubes are used in demanding, high-temperature settings. Its key use is in equipment that operates between 800°F to 1500°F (427°C to 816°C). It resists harmful corrosion that can happen after welding. This makes it perfect for boiler tubes, superheater tubes, and high-temperature chemical process piping. It is also common in aircraft exhaust manifolds and refinery equipment.

What is the difference between SS 347 and 304 stainless steel tube?

The main difference is in the chemical composition. SS 347 has Niobium (also known as Columbium) and Tantalum added to its composition. These elements stop sensitization, where chromium carbide forms during welding. This makes SS 347 much better for welded parts exposed to high heat. Standard SS 304 lacks these stabilizing elements. 304 should not be used in the high-heat range of 800°F to 1500°F after it has been welded.

What do you weld 347 stainless steel tube with?

To weld 347 stainless steel tubes, you should use a matching filler metal. The AWS E347 or ER347 filler materials are the best choices. These fillers have Niobium, which keeps the weld area safe from corrosion. You can use standard welding methods like TIG (Gas Tungsten Arc Welding) or MIG (Gas Metal Arc Welding). Remember to clean the metal well before and after welding for the best result.

What is the composition of 347 stainless steel tube?

The composition of 347 stainless steel is an austenitic alloy, similar to 304, but with important additions. It contains a minimum of 17% Chromium and 9% Nickel for corrosion resistance. The essential difference is the addition of Niobium and Tantalum. These stabilizing elements are added at a total of about ten times the carbon content. The carbon content is usually less than 0.08%. This specific chemistry gives it its superior high-temperature performance, a feature we are proud to offer here at our facility.