439 Stainless Steel Supply

439 Stainless Steel Properties

Corrosion Resistance: 439 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: 439 stainless steel has moderate strength, making it suitable for applications that require moderate mechanical strength. It has a minimum tensile strength of 415 MPa and a minimum yield strength of 205 MPa.

Weldability: 439 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: 439 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: 439 stainless steel is magnetic in all conditions.

Heat Resistance: 439 stainless steel has good heat resistance up to 815°C (1500°F). It can be used in high-temperature applications such as exhaust systems, mufflers, and catalytic converters.

Chemical Composition

The chemical composition of grade 439 stainless steel is outlined in the following table.

ElementContent (%)
Iron, Fe81.3535
Chromium, Cr17.35
Silicon, Si0.35
Titanium, Ti0.335
Manganese, Mn0.25
Nickel, Ni0.200
Molybdenum, Mo0.1
Niobium, Nb (columbium, Cb)0.02
Phosphorous, P0.02
Nitrogen, N0.0100
Carbon, C0.01
Sulfur, S0.0015

Mechanical Properties

The mechanical properties of grade 439 stainless steel are displayed in the following table.

PropertiesMetricImperial
Tensile strength (annealed)438 MPa63500 psi
Yield strength (annealed/ @strain 0.200 %)263 MPa38100 psi
Modulus of elasticityGPaksi
Poisson’s ratio0.270 - 0.2900.270 - 0.290
Elongation at break (In 2", 50% cold worked)2.80%2.80%
Hardness, Rockwell B (annealed)72.972.9

439 Stainless Steel Applications

439 stainless steel is a ferritic stainless steel known for its corrosion resistance and heat resistance. It contains a higher percentage of chromium compared to some other ferritic stainless steels, providing improved corrosion resistance. Here are some common applications of 439 stainless steel:

  1. Automotive Exhaust Systems: 439 stainless steel is commonly used in the manufacturing of automotive exhaust systems, including exhaust pipes and mufflers. Its resistance to corrosion in high-temperature and corrosive environments makes it suitable for this application.
  2. Heat Exchangers: The corrosion resistance and heat resistance of 439 stainless steel make it suitable for use in heat exchangers, particularly in applications where exposure to corrosive gases and high temperatures is common.
  3. Appliances: Certain household appliances, such as ovens, cooktops, and range hoods, may use 439 stainless steel due to its corrosion resistance and aesthetic appeal.
  4. Cladding for Washing Machines and Dishwashers: The corrosion resistance and durability of 439 stainless steel make it a suitable material for cladding on the exterior of washing machines and dishwashers.
  5. Tubular Manifolds: In industrial applications, 439 stainless steel may be used for tubular manifolds and piping systems, especially when corrosion resistance and heat resistance are essential.
  6. Outdoor Applications: The corrosion resistance of 439 stainless steel makes it suitable for outdoor applications, such as architectural elements, where exposure to the elements could lead to corrosion.
  7. Catalytic Converter Shells: Due to its corrosion resistance at high temperatures, 439 stainless steel is used in the manufacturing of catalytic converter shells in automotive exhaust systems.
  8. Chimney Liners: The heat resistance and corrosion resistance properties of 439 stainless steel make it suitable for use in chimney liners, providing durability in high-temperature environments.
  9. Furnace Parts: Components in furnaces and heating systems may be made from 439 stainless steel due to its resistance to corrosion and high-temperature performance.
  10. Industrial Ductwork: 439 stainless steel is used in industrial ductwork and ventilation systems where corrosion resistance is required, especially in applications involving chemical fumes.

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