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Stainless Steel 347 tubing is a type of stainless steel tubing known for its high corrosion, heat, and oxidation resistance. It belongs to the austenitic stainless steel family and is stabilized with columbium (niobium) and tantalum. This stabilization process enhances its resistance to intergranular corrosion when exposed to high temperatures. Stainless Steel 347 tubing is widely used in various industries due to its excellent mechanical properties, corrosion resistance, and durability.

Stainless Steel 347 tubing, a member of the austenitic stainless steel family, stands out for its remarkable corrosion, heat, and oxidation resistance. The alloy's composition, consisting mainly of iron, chromium, and nickel, is further stabilized with columbium (niobium) and tantalum. This stabilization process enhances its ability to resist intergranular corrosion, particularly when exposed to high temperatures. With a chromium content ranging from 17% to 20%, nickel from 9% to 13%, and columbium/tantalum additions, Stainless Steel 347 tubing exhibits robust mechanical properties that make it suitable for various demanding applications.

Mechanical Properties of Stainless Steel 347 Tubing:

Discover the robust mechanical characteristics of Stainless Steel 347 Tubing through a comprehensive and informative properties table.

Yield Strength, min. (ksi)30
Tensile Strength, min. (ksi)75
Elongation, min. (%)40
Hardness, max. (Rb)92

Stainless Steel 347 Tubing showcases impressive mechanical properties, featuring high strength, corrosion resistance, and durability for reliability.

Applications of Stainless Steel 347 Tubing:

  1. Petrochemical Industry: Stainless Steel 347 tubing finds extensive use in the petrochemical industry, particularly in applications involving high-temperature environments such as refineries and chemical processing plants. It is utilized in constructing heat exchangers, reactors, and piping systems due to its resistance to corrosion and oxidation at elevated temperatures.
  2. Aerospace Industry: In aerospace applications, where components are subjected to extreme temperatures and aggressive environments, 347 Stainless Steel tubing is preferred for its superior heat resistance and reliability. It is commonly used in aircraft engines, exhaust systems, and aerospace structures.
  3. Power Generation: 347 Stainless Steel tubing is also utilized in power generation facilities, including nuclear power plants, where components must withstand high temperatures and corrosive conditions. Due to its excellent mechanical properties and corrosion resistance, it is employed in steam generators, boiler tubes, and heat exchangers.
  4. Chemical Processing: 347 Stainless Steel tubing is well-suited for various chemical processing applications where resistance to corrosion by acids, alkalis, and other chemicals is crucial. It is used to construct reaction vessels, piping systems, and storage tanks in chemical plants and pharmaceutical manufacturing facilities.
  5. High-Temperature Furnaces: Given its exceptional resistance to oxidation and cyclic heating, Stainless Steel 347 tubing is employed in fabricating high-temperature furnace components such as radiant tubes, heating elements, and furnace fixtures.
  6. Automotive Exhaust Systems: In automotive applications, particularly in exhaust systems, Stainless Steel 347 tubing is favoured for its ability to withstand high temperatures and corrosive gases, prolonging the service life of exhaust components and reducing maintenance requirements.

Chemical Composition of Stainless Steel Tubing:

Explore the precise chemical composition of Stainless Steel 347 Tubing for optimal performance in various applications.

Niobium10 x C min / 1.00 max

Stainless Steel 347 Tubing exhibit a well-balanced chemical composition, ensuring corrosion resistance, durability, and reliable performance.

Advantages of Stainless Steel 347 Tubing:

  • High-Temperature Resistance: One of the key advantages of 347 Stainless Steel tubing is its exceptional resistance to high temperatures, making it suitable for applications involving continuous or intermittent exposure to elevated heat.
  • Corrosion Resistance: Stainless steel 347 tubing offers excellent corrosion resistance in various environments, including corrosive chemicals, acids, and salt solutions. Its stabilized composition helps prevent sensitization and intergranular corrosion.
  • Oxidation Resistance: The alloy's composition provides superior resistance to oxidation, even at elevated temperatures, ensuring long-term performance and reliability in demanding environments.
  • Strength and Durability: Stainless Steel 347 tubing exhibits high strength and durability, allowing it to withstand mechanical stresses and pressures encountered in various industrial applications.
  • Ease of Fabrication: 347 Stainless Steel tubing can be readily fabricated, welded, and formed using common manufacturing processes, making it versatile and cost-effective for various applications.
  • Low Maintenance: Due to its inherent resistance to corrosion and oxidation, SS 347 tubing requires minimal maintenance, resulting in reduced downtime and lower lifecycle costs for equipment and infrastructure.

Physical Properties of Stainless Steel 347 Tubing:

Explore the intrinsic characteristics of Stainless Steel 347 Tubing through a detailed Physical Properties table for applications.

Property347 Data
Density, lb/in30.288
Density, lb/in30.288
Modulus of Elasticity, psi28.0 x 106
Coefficient of Thermal Expansion, 68-212˚F, /˚F9.3 x 10-6
Thermal Conductivity, Btu/ft hr ˚F9.2
Specific Heat, Btu/lb ˚F0.12
Electrical Resistivity, Microohm-in28.4

Stainless Steel 347 Tubing exhibits superior physical properties, ensuring stability, resilience, and versatility for diverse industrial applications.

In conclusion, Stainless Steel 347 tubing is a highly versatile and reliable material suitable for various industrial applications. Its unique combination of high-temperature resistance, corrosion resistance, and mechanical properties make it indispensable in industries such as petrochemical, aerospace, power generation, chemical processing, automotive, and more. By choosing 347 Stainless Steel tubing, industries can benefit from enhanced performance, extended service life, and reduced maintenance requirements, ultimately leading to improved operational efficiency and cost savings.

FAQ's for Stainless Steel 347 Tubing

The Harmonized System (HS) code for stainless steel tubing is 7304.10.00. 

347 stainless steel tubing is magnetic. 

347 stainless steel tubing is corrosion resistant in aqueous environments that contain up to 25% chlorides (NaCl or KCl). In addition, the alloy also has resistance to sulfuric and phosphoric acids. However, it is not suitable for use in environments with greater than 25% chlorides.

347 stainless steel is a type of austenitic stainless steel with excellent corrosion resistance, oxidation resistance, and high-temperature strength. It has a Rockwell hardness C (Rc) scale range of 25-30. 347 stainless steel possesses good creep strength and can be used for applications requiring welding or hot-working. It has excellent formability and cryogenic properties, making it suitable for use in extreme temperatures ranging from cryogenic to 1,700°F (927°C).

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