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Is 304 or 409 stainless steel better?

409 is cheap, 1.4512 409 stainless steel is a ferritic steel with good mechanical properties and high temperature corrosion resistance. It contains 11% chromium, which is the minimum amount required to form the passive surface film that makes stainless steel corrosion resistant. It has good high temperature corrosion resistance, medium strength, good formability and overall cost.
409 is the perfect grade of stainless steel to use in automotive applications where visual appeal is not a priority. For this reason and its durability against gas corrosion, 409 is most commonly used in truck exhaust systems, agricultural equipment, and heat and gas turbine exhaust mufflers
409 grade stainless steel has excellent exhaust gas and atmospheric corrosion resistance, which is better than 410 martensitic grade stainless steel with 12% chromium content and 3CR12 stainless steel. However, its corrosion resistance is lower than that of 430 grade steel with 17% chromium. The surface of 409 grade steel is susceptible to mild corrosion, which limits the use of steel for decorative purposes
EDEST STEEL is a large steel group enterprise that exports stainless steel plates and carbon steel materials all the year round, and has a large number of 304 stainless steel plates and 316L stainless steel plates in stock.