347 stainless steel tube, also referred to as TP347, is an austenitic stainless steel tube that consists of 17-19% chromium, 9-13% nickel, around 2% manganese, a maximum of 0.08% carbon, stabilised columbium (niobium), and many other elements in tiny proportions. It is one of the grades of stainless steel seamless tubes.
ASTM A213 Stainless Steel 347 Seamless Tube Manufacturer
We at Xintongda Special Steel (XTD) are a reliable name in China for the manufacturing and supplying of stainless steel 347 seamless tubes. Generally known as TP347 or SS 347, this is a high-performance austenitic stainless steel made of chromium (17-20%), nickel (9-13%), manganese (2% max), carbon (0.08% max), stabilised by columbium (niobium) plus tantalum at 10×C min to 1.10% max, and other elements within specified limits. Our SS 347 seamless tubes comply fully with ASTM A213, ASME SA213, AMS 5571, and EN 10216-5 standards. The added niobium stabilises the alloy against chromium carbide precipitation at 800-1500 °F temperature range. Our 347 stainless tube also resists intergranular corrosion and has higher creep and stress-to-rupture strength. These properties make 347 seamless tubing suitable for heat exchangers, food processing equipment, etc.
Being a leading manufacturer and supplier of stainless steel 347 tube, we only provide rigorously tested products. We hold 4 decades of experience in this industry and are multiple international certified. Our annual supply capacity is 25,000 tons, and we deliver in-stock products within a week and production orders in 15-60 days.
Product specifications:
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Standard
ASTM A213
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OD Range
6.35-257 mm
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Thickness
0.89-12.7 mm
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Length
≤ 22 m
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Technical Data
Technical Data
347 Stainless Steel Tube Manufacturing Process
To manufacture our 347 Seamless Stainless Steel tube, we first take a solid stainless steel billet and heat and pierce it to make it hollow. Then, the hollow shell undergoes hot working and cold-drawing to get its precise dimensions. Later, controlled solution annealing is performed to retain the tube’s corrosion resistance. The last step involves pickling and straightening before the tube is sent for testing. You can study the whole manufacturing process by simply clicking here.
What are the Key Features of SS 347 Seamless Tube?
Our TP347 seamless tube offers 3 main features: weldability & fabricability, corrosion resistance, and high-temperature performance.
- Excellent Weldability & Fabricability: The niobium (columbium) present in this alloy combines with carbon to form stable niobium carbides. This process prevents chromium carbide precipitation at grain boundaries during the welding process, which makes the TP347 tube highly weldable and fabricable.
- Corrosion Resistance: Our TP347 tube resists corrosion because chromium forms a protective oxide layer, while niobium prevents chromium carbide precipitation at grain boundaries.
- High-Temperature Performance: The fully austenitic microstructure and niobium stabilisation together enable our stainless steel 347 seamless tube to perform reliably at elevated temperatures ranging from 800–1500°F
ASTM A213 TP347 Tube Equivalent Material
The ASTM A213 TP347 tube is globally recognised by its UNS number as S34700. However, it is also known by its Werkstoff number as DIN 1.4550.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| 347 | S34700 | S34778 | 06Cr18Ni11Nb | SUS347 | X6CrNiNb18-10 | 1.4550 | 08X18H12Б |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
What industries commonly use 347 Stainless Steel Seamless Tube?
ASTM A213 347 Seamless Tubes are used in industries where intergranular corrosion, elevated temperatures, chromium carbide precipitation, etc, are the risks.
Water Treatment/Filtration
Stainless 347 tube is used in thermal desalination, evaporators, distillation units, Boiler feed water systems, thermal purification units, and hot water recovery systems.
Power Generation
In the power generation industry, we supply our SS 347 tubes for superheaters and reheaters of boilers, auxiliary high-temperature steam circuits, main steam lines, and combustion-related heat transfer systems.
Chemical & Petrochemical
We supply our tubes for condensers handling hot hydrocarbons and process chemicals, as well as furnace and heater components including transfer lines and convection zone tubing.
Aerospace
We supply our SS 347 tubing for exhaust manifolds, tailpipe sections, hot gas transfer ducts, engine bleed-air and hot air systems, and afterburner and auxiliary engine components.
Oil & Gas
Generally used in refinery heaters, steam distribution lines, furnace coils, and Crude distillation units (CDU) & Vacuum distillation units (VDU).
Frequently Asked Questions
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What is a 347 stainless steel tube?
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What are the key properties of 347 Stainless Steel Tubing?The key properties of 347 stainless steel tubing are high resistance to intergranular & general corrosion, excellent stability at high temperatures, good weldability & formability, very good mechanical strength, and non-magnetic properties in the annealed condition.
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What is the maximum operating temperature for SS 347 stainless steel tubes?The maximum operating temperature for SS 347 stainless steel tubes is up to 815-870°C (1500-1600°F) for continuous service in oxidising environments.