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 (wt%) limits as specified in ASTM A240 and ASME SA240*.
| Element | 409 |
| Carbon | 0.03 |
| Chromium | 10.5-11.7 |
| Nickel | 0.50 |
| Manganese | 1.00 |
| Silicon | 1.00 |
| Nitrogen | 0.030 |
| Phosphorus | 0.040 |
| Sulfur | 0.020 |
| Niobium | 8 x (C+N) min / 0.15-0.50 |
* Maximum, unless range is indicated
Mechanical property requirements for annealed product as specified in ASTM A240 and ASME SA240.
| Property | 409 |
| Yield Strength, min. (ksi) | 25 |
| Tensile Strength, min. (ksi) | 55 |
| Elongation, min. (%) | 20 |
| Hardness, max. (Rb) | 88 |
Physical properties for Type 409 stainless steel
| Property | 409 Data |
| Density, lb/in3 | 0.279 |
| Modulus of Elasticity, psi | 32.0 x 106 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 6.5 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 13.2 |
| Specific Heat, Btu/lb ˚F | 0.11 |
| Electrical Resistivity, Microohm-in | 24.8 |
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