409L (UNS S40903)
- 409 Ferritic Stainless Steel
UNS S4097
Introduction & Properties
409L (UNS S40903) is a kind of stabilised versions of 409, and it has good oxidation resistance and good welding performance.
Chemical Composition of 409L (UNS S40903)
Grade C Mn Si P S Cr Ni
409L min -- -- -- -- 10.5 -- --
max 0.03 1.00 1.0 0.04 0.03 11.75 0.50
Forging process of 409L/S40903
Preheat / ℃ initial forging temperature / ℃ final forging temperature / ℃ Cooling
760 1040 ~ 1120 705 ~ 790 air-cooled
Heat treatment of 409L/S40903
Annealing temperature is 780 ~ 950 ℃, cooling, the hardness ≤ 197HBW.
Application
409L (UNS S40903) is mainly used on automotive parts shown as below:
• front pipes
• convert shells
• center pipes
• tailpipes
• heat exchangers
• containers
• heat-resistant components
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