SS 347H Seamless Tubes Manufacturer and Supplier in Thailand

Name: Stainless Steel 347H Seamless Tubes
Brand: Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd.

Stainless Steel 347H Seamless Tubes are high-performance austenitic stainless steel tubes stabilized with niobium, specifically designed for elevated temperature applications and enhanced creep resistance. Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd., based in Chon Buri, is a trusted supplier and manufacturer specializing in premium 347H seamless tubes, backed by years of pipe manufacturing experience. Our tubes are offered in a wide range of sizes and wall thicknesses, with pressure ratings that meet demanding industrial requirements. Manufactured in compliance with ASTM A213, ASME SA213, DIN 1.4961, and UNS S34709 standards, our tubes deliver excellent corrosion resistance, durability, and high-temperature strength. Widely used in industries such as chemical processing, marine, pharmaceuticals, oil & gas, and heat exchangers, our stainless steel 347H seamless tubes are built for long-lasting performance. We ensure consistent quality, strength, and precision to meet international standards and critical project specifications.

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Product Overview: 347H Stainless Steel Seamless Tubes

Stainless Steel 347H Seamless Tubes is a high-performance alloy tube made with higher carbon (0.04 – 0.10) content and columbium (niobium) stabilization. Designed to withstand temperatures ranging from 800 – 1500°F (427 – 816°C), this chromium-nickel stainless steel tube provides superior mechanical and fracture strength, making it ideal for pressure vessels and heat exchangers. Manufactured as per ASTM A213 and ASTM A269 standards, these tubes are available in a wide size range from 6mm OD up to 300 OD, with wall thicknesses from 0.4 mm to 30 mm and widths ranging from 1/8″ to 48″. The seamless design ensures uniformity and strength without welds. Available in various surface finishes like bright annealed, pickled and polished for different application needs. Due to its stable structure, these tubes deliver consistent performance and durability in challenging operating conditions.

Key Benefits Of Stainless Steel 347H Seamless Tubes

These seamless tubes offer various benefits that make them perfect for high-temperature and pressure applications. Following are the benefits of ss 347H seamless tubes

Resists oxidation and intergranular corrosion in aggressive environments, making it ideal for harsh chemical and marine services.

These tubes perform reliably in temperatures between 800 – 1500°F (427 – 816°C), retaining strength and resisting thermal fatigue.

Allows easy fabrication and welding without risk of carbide precipitation, ensuring structural integrity in pressure systems.

SS 347H seamless tubes remain non-magnetic even after exposure to high temperatures, suitable for sensitive industrial and electronic applications.

Offers high fracture strength and stability, especially in heavy wall thickness tubes used for high-pressure tubelines.

These tubes withstand thermal cycling, corrosion and pressure fluctuations, ensuring reliable service over extended periods.

Why Choose Our Stainless Steel 347H Seamless Tubes?

Our stainless steel 347H seamless tubes are made with strict quality control and tested for reliable performance. We offer competitive pricing, a wide size range and quick delivery. Customers value our consistent product quality and positive reviews. Easy to buy and suitable for long-term use in tough environments.

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A312 TP347H Seamless Tubes Specifications

The following is the detailed specification of these tubes. These tubes are available in a wide size range, thicknesses and grades with seamless manufacturing options.

Specifications	ASTM A213 / ASME SA213
Dimensional specification	ANSI/ASME B36.19M, ANSI/ASME B36.10M
Size	1 / 8" NB - 24" NB
Outside Diameter	6.00 mm OD up to 914.4 mm OD, Sizes up to 24” NB available Ex-stock, OD Size Steel Tubes available Ex-stock
Schedule Thickness Range	SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
End Types	Plain End, Beveled End, Treaded One End, TBE (Treaded Both Ends)
Surface Finish	No.1, No.4, No.8 Mirror Finish, 2B
Value Added Services	Cutting, Beveling, Polishing, Threading, Destructive, Non Destructive, Ultrasonic Testing
Outside Finish	2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Seamless Pipes, Finish as per customer Requirements
Delivery Condition	Annealed and Pickled, Polished, Bright Annealed, Cold Drawn
Heat Treatment	Normalized, Normalized & Tempered
Packing of Seamless Pipes	Packed in Wooden Boxes, Plastic Bags, Steel Strips Bundled, or as per Customers Requests
Specials	Sizes and Specifications other than above can be on request

Chemical Composition of 347H Seamless Tubes

The table outlines chemical composition which include chromium, nickel, columbium and carbon—each element enhancing strength and 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 ASTM A213 347H Stainless Steel Seamless Tubes

The table provides mechanical properties of stainless steel 347H seamless tube including tensile strength, yield strength, elongation and hardness to ensure reliable performance.

Yield Strength (psi, min)	Yield Strength (MPa)	Ultimate Tensile Strength (psi, min)	Ultimate Tensile Strength (MPa)	Elongation in 2 in. (% min)	Hardness (Brinell max)
30,000	205	75,000	515	40	201 Brinell

Equivalent Of 347H Stainless Steel Seamless Steel Tubes

The table lists equivalent grades and international standards for easy comparison and material selection.

STANDARD	WERKSTOFF NR.	UNS	JIS	GOST	EN
SS 347H	1.4961	S34709	SUS 347H	-	X6CrNiNb18-12

Stainless Steel 347H Seamless Tubes Size Chart

Below chart shows detailed size options available to match specific project needs and design standards.

ASTM A312 SS 304 Pipes OD mm	Pipe WT mm	in.	Sch	Kg/m
13.72	1.65	1/4	10S	0.50
13.72	2.24	1/4	40S	0.64
13.72	3.02	1/4	80S	0.81
17.15	1.65	3/8	10S	0.64
17.15	2.31	3/8	40S	0.86
17.15	3.20	3/8	80S	1.12
21.34	2.11	1/2	10S	1.02
21.34	2.77	1/2	40S	1.29
21.34	3.73	1/2	80S	1.65
26.67	2.11	3/4	10S	1.30
26.67	2.87	3/4	40S	1.71
26.67	3.91	3/4	80S	2.23
33.40	2.77	1	10S	2.13
33.40	3.38	1	40S	2.54
33.40	4.55	1	80S	3.29
33.40	6.352)	1	160	4.30
42.16	2.77	1¼	10S	2.73
42.16	3.56	1¼	40S	3.44
42.16	4.85	1¼	80S	4.53
42.16	6.352)	1¼	160	5.69
48.26	2.77	1½	10S	3.16
48.26	3.68	1½	40S	4.11
48.26	5.08	1½	80S	5.49
60.33	2.77	2	10S	3.99
60.33	3.91	2	40S	5.52
60.33	5.54	2	80S	7.60
60.33	8.742)	2	160	11.29
73.03	3.05	2½	10S	5.35
73.03	5.16	2½	40S	8.77
73.03	7.01	2½	80S	11.59
88.90	3.05	3	10S	6.56
88.90	5.49	3	40S	11.47
88.90	7.62	3	80S	15.51
88.90	11.132)	3	160	21.67
101.60	3.05	3½	10S	7.53
101.60	5.74	3½	40S	13.78
101.60	8.08	3½	80S	18.92
114.30	3.05	4	10S	8.50
114.30	6.02	4	40S	16.32
114.30	8.56	4	80S	22.67
114.30	13.492)	4	160	34.05
141.30	6.55	5	40S	22.10
141.30	9.53	5	80S	31.44
141.30	15.882)	5	160	49.87
168.28	3.4	6	10S	14.04
168.28	7.11	6	40S	28.69
168.28	10.97	6	80S	43.21
168.28	14.27	6	120	54.75
168.28	18.262)	6	160	68.59
219.08	8.18	8	40S	43.20
219.08	12.7	8	80S	65.63
219.08	18.23	8	120	91.30
219.08	23.012)	8	160	112.97

Stainless Steel 347H Seamless Tubes Of Manufacturing Process

Stainless steel 347h seamless tube manufacturing involves a five-stage process to ensure high quality.

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 347H Seamless Tubes

Stainless steel 347H seamless tubes are primarily used in the chemical and petrochemical industry for high-temperature and corrosive fluid transport, making it the leading sector for their application. They are widely installed in heat exchangers, reactors, and furnace components where thermal stability and resistance to intergranular corrosion are critical. These tubes are also used in refineries, power plants, and exhaust systems in the aerospace and automotive sectors, where they withstand constant thermal cycling and high-pressure environments without failure. Their durability and heat resistance make them essential in processing lines handling hot acids, steam, and flue gases.

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 347H material?

347H is a high-carbon version of the standard Type 347 austenitic stainless steel. The ‘H’ stands for “High Carbon.” This higher carbon content is specifically added to boost the material’s creep resistance and provide higher strength at elevated temperatures. Like its standard counterpart, it is stabilized with Niobium (Columbium) to prevent a type of corrosion called sensitization, which happens after welding. This makes it ideal for critical, high-heat applications.

What is the density of 347H tube?

The typical density for 347H stainless steel tube is approximately 7.96 to 8.00 grams per cubic centimeter g/cm3. In Imperial units, this is about 0.288 pounds per cubic inch lb/in3. This density is comparable to many other common austenitic stainless steel grades, like 304.

What is the temperature range for SS 347H tube?

The SS 347H tube is designed for superior performance in high-temperature settings. It has excellent resistance to intergranular corrosion after exposure to the range of 800 °F to 1500 °F (427 °C to 816 °C). For continuous service, its maximum temperature limit for oxidation and strength is around 1500°F (815°C) in common code applications, and it can resist oxidation up to about 1650°F (900°C) for intermittent use.

What is the yield strength of 347H tube?

The minimum specified 0.2% offset yield strength for 347H tube in the annealed condition is typically 30 ksi (205 MPa). This value represents the stress the material can handle before permanent deformation begins. The higher carbon content of 347H helps it maintain this strength, and its high-temperature strength is generally better than standard Type 347 and other common grades like 304.