409 Stainless Steel Supply

409 Stainless Steel Properties

Corrosion Resistance: 409 stainless steel is known for its excellent corrosion resistance in mild environments. It is resistant to corrosion from chemicals, solvents, and salts.

Heat Resistance: 409 stainless steel has good heat resistance up to 815°C (1500°F). It can be used in high-temperature applications such as exhaust systems and catalytic converters.

Weldability: 409 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: 409 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: 409 stainless steel is magnetic in all conditions.

Strength: 409 stainless steel has good strength, making it suitable for applications that require high levels of mechanical strength. It has a minimum tensile strength of 380 MPa and a minimum yield strength of 170 MPa.

Chemical Composition

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

Element409
Carbon0.03
Chromium10.5-11.7
Nickel0.50
Manganese1.00
Silicon1.00
Nitrogen0.030
Phosphorus0.040
Sulfur0.020
Niobium8 x (C+N) min / 0.15-0.50

* Maximum, unless range is indicated

Mechanical Properties

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

Property409
Yield Strength, min. (ksi)25
Tensile Strength, min. (ksi)55
Elongation, min. (%)20
Hardness, max. (Rb)88

Physical Properties

Physical properties for Type 409 stainless steel

Property409 Data
Density, lb/in30.279
Modulus of Elasticity, psi32.0 x 106
Coefficient of Thermal Expansion, 68-212˚F, /˚F6.5 x 10-6
Thermal Conductivity, Btu/ft hr ˚F13.2
Specific Heat, Btu/lb ˚F0.11
Electrical Resistivity, Microohm-in24.8

409 Stainless Steel Applications

409 stainless steel is a ferritic stainless steel known for its excellent corrosion resistance and relatively low cost. It is often used in applications where corrosion resistance is essential, and higher levels of mechanical properties are not critical. Here are some common applications of 409 stainless steel:

  1. Automotive Exhaust Systems: One of the primary applications of 409 stainless steel is in the manufacturing of automotive exhaust systems, including exhaust pipes, mufflers, and catalytic converter shells. Its corrosion resistance makes it suitable for withstanding exposure to corrosive gases and high temperatures.
  2. Heat Exchangers: 409 stainless steel is used in the production of heat exchangers, especially those involved in heating and air conditioning systems. Its corrosion resistance and thermal conductivity properties make it suitable for such applications.
  3. Industrial Ductwork: Ductwork and ventilation systems in industrial settings, where resistance to corrosive gases is crucial, may use 409 stainless steel.
  4. Bus and Truck Bodies: The corrosion resistance of 409 stainless steel makes it suitable for certain applications in the transportation industry, such as bus and truck bodies.
  5. Kitchen Equipment: Some components of kitchen equipment, such as range hoods and oven linings, may be made from 409 stainless steel due to its corrosion resistance.
  6. Catalytic Converter Substrates: The corrosion resistance of 409 stainless steel is beneficial in the production of catalytic converter substrates used in the automotive industry.
  7. Structural Components: Certain structural components in construction and architecture, where corrosion resistance is important, may use 409 stainless steel.
  8. Fuel Filters: Components in fuel filters, especially those exposed to corrosive elements, may be made from 409 stainless steel.
  9. Exhaust Pipes for Industrial Equipment: Similar to automotive exhaust systems, industrial equipment with exhaust systems may use 409 stainless steel pipes.
  10. Waste Gas Handling Systems: Systems involved in handling waste gases, such as in industrial processes, may use 409 stainless steel for its corrosion resistance.

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