409 Aluminized Stainless Steel
Type 409 Aluminized is a ferritic stainless steel that is dipped in an aluminum coating. This alloy was developed for car exhaust systems and therefore possesses great corrosion and oxidation resistance as well as superior formability properties.
Specifications
ASTM A240 for annealed condition
ASTM A666 for tempered material*
| Composition per ASTM A240 | |
|---|---|
| Carbon | .03 Max |
| Manganese | 1.00 Max |
| Phosphorus | .04 Max |
| Sulfur | .02 Max |
| Silicon | 1.00 Max |
| Chromium | 10.50 - 11.70 |
| Nickel | .50 Max |
| Nitrogen | .03 Max |
| Molybdenum | |
| Mechanical Properties (Annealed, Per ASTM A240) | |
| UTS | 55,000 ksi Min |
| Elongation % in 2" | 20.00 Min |
| Rockwell Hardness |
RB88.00 Max |
* Tempered mechanical properties are available upon request.
409 Aluminized stainless steel applications
409 aluminized stainless steel is specifically used in car and truck exhaust systems for its ability to resist pitting corrosion from road salt, to resist muffler corrosion, to reduce red rust, and to provide oxidation resistance.
Magnetic Properties: 409 Aluminized stainless steel is magnetic and cannot be hardened by heat treatment.
Forming: Type 409 AL has excellent formability properties for many shapes.
