Grade 409 stainless steels have excellent resistance to exhaust gas and atmospheric corrosion, superior to that of 410 martensitic grades with 12% chromium and 3CR12. However, the corrosion resistance is lower than that of grade 430 steels containing 17% chromium. The surface of Grade 409 stainless steels is liable to mild corrosion, which limits the usage of steels for decorative purposes.
Heat Resistance
Grade 409 stainless steels offer scaling resistance at temperatures up to 675°C during continuous operation, and up to 815°C under intermittent conditions. These temperatures pertain to specific service environments.
| Element | SS 409 |
| C | 0.08 max |
| Mn | 1 max |
| Si | 1 max |
| P | 0.045 max |
| S | 0.045 max |
| Cr | 10.5 – 11.75 |
| Ni | 0.5 max |
| Ti | 6x C – 0.75 |
MECHANICAL PROPERTIES OF SS 409 SHEET AND PLATE
| Element | SS 409 |
| Density | 7.8 g/cm3 |
| Tensile Strength | MPa – 380 |
| Yield Strength (0.2%Offset) | MPa – 170 |
| Elongation | 20 % |
| Hardness | Rockwell B (HR B)- 88 / Brinell (HB)- 0.5t |
Heat Treatment
Annealing of grade 409 steels is carried out at temperatures ranging from 790 to 900°C, followed by air-cooling. Thermal treatment does not harden grade 409 steels.
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