Chaozhou Zesheng Hardware Products Co., Ltd.
04
2026
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06
What is the difference between 403 and 304 stainless steel?
Author:
Zesheng
The main differences between stainless steel 304 and 403 are 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; while 403 stainless steel has higher hardness and greater strength, making it suitable for making knives, bearings, and other uses.
The specific differences are as follows:
Microstructure: 304 is an austenitic stainless steel with good toughness and strong corrosion resistance; 403 is a martensitic stainless steel with high hardness and strength.
Corrosion resistance: 304 stainless steel contains a higher proportion of nickel and chromium, giving it superior corrosion resistance and allowing it to remain stable in humid or high acidity/alkalinity 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. 403 stainless steel, on the other hand, tends to harden more easily during processing, requiring more skill and attention.
Application fields: Due to the above differences, their application areas also vary. 304 is widely used in chemical, food, pharmaceutical, and other fields; while 403 is more used in the automotive, medical equipment, and kitchenware industries.
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