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.
The chemical composition of grade 439 stainless steel is outlined in the following table.
| Element | Content (%) |
|---|---|
| Iron, Fe | 81.3535 |
| Chromium, Cr | 17.35 |
| Silicon, Si | 0.35 |
| Titanium, Ti | 0.335 |
| Manganese, Mn | 0.25 |
| Nickel, Ni | 0.200 |
| Molybdenum, Mo | 0.1 |
| Niobium, Nb (columbium, Cb) | 0.02 |
| Phosphorous, P | 0.02 |
| Nitrogen, N | 0.0100 |
| Carbon, C | 0.01 |
| Sulfur, S | 0.0015 |
The mechanical properties of grade 439 stainless steel are displayed in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength (annealed) | 438 MPa | 63500 psi |
| Yield strength (annealed/ @strain 0.200 %) | 263 MPa | 38100 psi |
| Modulus of elasticity | GPa | ksi |
| Poisson’s ratio | 0.270 - 0.290 | 0.270 - 0.290 |
| Elongation at break (In 2", 50% cold worked) | 2.80% | 2.80% |
| Hardness, Rockwell B (annealed) | 72.9 | 72.9 |
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