409 plate stainless steels are applied mainly in the automotive exhaust industry but 409 plate stainless steel is highly used in some other applications also like mufflers, catalytic converter, tailpipes, in hospital, Heat exchanger tubing, furnace component, etc. Various 409 plate stainless steel tests are duly performed for assuring the quality.
ASTM A240 Stainless Steel 409 Chemical Composition
| Grade | C | Ni | Si | S | Mn | P | Cr | Ti | |
| SS 409 | min. | – | – | – | – | – | – | 10.5 | 6x C |
| max. | 0.08 | 0.5 | 1.00 | 0.045 | 1.00 | 0.045 | 11.75 | 0.75 |
Cold working
409 and 1.4509 have fair formability characteristics with useful mechanical properties. Their ductility allows them to be formed by bending and deep drawing. They do not undergo significant work hardening when cold formed.
Welding
409 and 1.4509 are prone to grain growth in the heat-affffected zone. As such, the tensile, fatigue and toughness properties in the welded condition are relatively poor. They should thus not be used for applications where tensile or dynamic loading will be experienced. The use of austenitic filler metals such as types 308L, 309L or 316L will improve the ductility of welds to some extent
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