What is the difference between 403 and 304 stainless steel?
The difference between stainless steel 304 and 403 is mainly reflected in corrosion resistance and hardness. 304 stainless steel has better corrosion resistance and toughness, making it suitable for food processing, medical instruments, and similar applications. On the other hand, 403 stainless steel has higher hardness and greater strength, making it suitable for making knives, bearings, and other applications.
The specific differences are as follows:
Different microstructures: 304 is an austenitic stainless steel, with good toughness and strong corrosion resistance; 403 is a martensitic stainless steel, with high hardness and great strength.
Corrosion resistance: 304 stainless steel contains a higher proportion of nickel and chromium, offering superior corrosion resistance and the ability to remain stable in humid or highly acidic/alkaline environments. Although 403 stainless steel also has some corrosion resistance, it may be slightly inferior to 304 in certain specific media.
Processing performance: 304 stainless steel is easier to process, whether cutting, welding, or forming, it is relatively simple. In contrast, 403 stainless steel is more prone to hardening during processing and requires more skill and attention.
Application fields: Due to the above differences, their application areas also differ. 304 is widely used in chemical, food, and pharmaceutical fields, while 403 is more commonly used in the automotive, medical equipment, and kitchenware industries.
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