Stainless steel 409, 410, 409L, 410L, which one has better high temperature resistance?

‌‌409 stainless steel can withstand temperatures up to 675°C during continuous operation and up to 815°C under intermittent conditions for anti-scaling.
409 stainless steel:
409 stainless steel has good heat resistance and is mainly used in high temperature environments such as automobile exhaust systems, combustion equipment, and furnace components.
Due to its ferrite structure, 409 stainless steel has a low thermal expansion rate and good high temperature oxidation resistance.
‌409L stainless steel:
409L stainless steel is an improved version of 409 and also has excellent high temperature resistance. It can achieve high-efficiency engines and exhaust systems, reduce the thickness of the exhaust system, and reduce exhaust gas emissions.
The temperature limit it can withstand is usually -20~650℃, showing good high temperature stability.
‌410 stainless steel:
Due to its martensitic structure, 410 stainless steel has high strength and hardness, but its plasticity and weldability may be poor, and high temperature resistance is not its main advantage.
‌410L stainless steel‌:
As a low-carbon version of 410, 410L stainless steel is similar to 410 in strength and hardness, but similarly, its high temperature resistance is not its most outstanding feature.
In summary, among stainless steels 409, 410, 409L, and 410L, 409 and 409L perform better in high temperature resistance and are particularly suitable for applications that need to withstand high temperature environments. 410 and 410L focus more on applications with high strength and hardness.

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