347 Stainless Steel Supply

347 Stainless Steel Properties

Corrosion Resistance: 347 stainless steel is known for its excellent corrosion resistance in highly corrosive environments, including acidic and alkaline environments. It is resistant to corrosion from chemicals, solvents, and salts.

Strength: 347 stainless steel has good high-temperature strength, making it suitable for applications that require high levels of mechanical strength at elevated temperatures. It has a minimum tensile strength of 515 MPa and a minimum yield strength of 205 MPa.

Weldability: 347 stainless steel is known for its good weldability, making it a popular choice for welding, brazing, and soldering. It can be welded using common welding techniques, such as TIG, MIG, and stick welding.

Ductility: 347 stainless steel has good ductility, which means that it can be easily formed and shaped without cracking or breaking. This property makes it ideal for applications that require complex shapes or designs.

Magnetic Properties: 347 stainless steel is non-magnetic in the annealed condition but may become slightly magnetic after cold working.

Heat Resistance: 347 stainless steel has excellent heat resistance up to 870°C (1600°F). It can be used in high-temperature applications such as furnace parts, heat exchangers, and exhaust systems.

Chemical Composition

Chemical Composition (wt%) limits as specified in ASTM A240 and ASME SA240*.

Niobium10 x C min / 1.00 max

* Maximum, unless range is indicated

Mechanical Properties

Mechanical property requirements for annealed product as specified in ASTM A240 and ASME SA240.

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

Physical Properties

Physical properties for Type 347 stainless steel

Property347 Data
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


Typical standards for Type 347 stainless steel

AMS 5512

347 Stainless Steel Applications

347 stainless steel is an austenitic stainless steel alloy that contains niobium (columbium), which enhances its ability to resist intergranular corrosion. This alloy is similar to 321 stainless steel but offers improved high-temperature properties. Here are some common applications of 347 stainless steel:

  1. Aerospace Components: 347 stainless steel is used in aerospace applications for components such as exhaust systems, jet engine parts, and other high-temperature applications.
  2. Heat Exchangers: The corrosion resistance and high-temperature stability of 347 stainless steel make it suitable for use in heat exchangers, especially in environments involving corrosive fluids.
  3. Chemical Processing Equipment: Due to its resistance to intergranular corrosion and high-temperature stability, 347 stainless steel is used in the manufacturing of chemical processing equipment, including reactors, vessels, and piping systems.
  4. High-Temperature Gaskets and Seals: 347 stainless steel's ability to withstand high temperatures makes it suitable for manufacturing gaskets and seals in applications where thermal stability is crucial.
  5. Power Generation Equipment: Components in power plants, including boiler tubes, heat exchangers, and turbine parts, may use 347 stainless steel for its resistance to high-temperature corrosion.
  6. Oil and Gas Industry: 347 stainless steel is utilized in the oil and gas industry for equipment such as pipes, valves, and fittings, especially in environments with elevated temperatures and corrosive substances.
  7. Automotive Exhaust Systems: The high-temperature resistance and corrosion resistance of 347 stainless steel make it suitable for use in automotive exhaust systems, including exhaust manifolds and pipes.
  8. High-Temperature Furnace Parts: Certain furnace components, such as burners and heat exchanger tubes, may be made from 347 stainless steel due to its ability to withstand high temperatures.
  9. Petrochemical Industry: Equipment used in petrochemical processing, including heat exchangers, piping, and reactors, may use 347 stainless steel for its corrosion resistance in aggressive chemical environments.
  10. Food Processing Equipment: In certain food processing applications that involve high temperatures and corrosive conditions, 347 stainless steel may be used for equipment such as ovens, trays, and piping.

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