What are the differences between 403 and 304 stainless steel?
What are the differences between 403 and 304 stainless steel?
Release time:
2025-08-18
The main differences between 304 and 403 stainless steel lie in their corrosion resistance and hardness. 304 stainless steel has better corrosion resistance and toughness, making it suitable for food processing, medical equipment, and other applications; while 403 stainless steel has higher hardness and strength, making it suitable for manufacturing knives, bearings, and other applications. The specific differences are as follows: Different Microstructure: 304 is austenitic stainless steel, with good toughness and corrosion resistance; 403 is martensitic stainless steel, with high hardness and strength. Corrosion Resistance: 304 stainless steel contains a higher proportion of nickel and chromium, and has better corrosion resistance, maintaining stability in humid or highly acidic environments. While 403 stainless steel also has some corrosion resistance, it may be slightly inferior to 304 in certain media. Processing Performance: 304 stainless steel is easier to process, and is relatively simple to cut, weld, or form. 403 stainless steel is more prone to hardening during processing, requiring more skill and attention. Application Areas: Due to the above differences, the two also differ in application areas. 304 is widely used in chemical, food, medical, and other fields; while 403 is more used in automotive, medical equipment, and kitchenware industries.
The main differences between 304 and 403 stainless steel are in corrosion resistance and hardness. 304 stainless steel has better corrosion resistance and toughness, making it suitable for food processing, medical equipment, and other applications; while 403 stainless steel has higher hardness and strength, making it suitable for making knives, bearings, and other applications.
The specific differences are as follows:
Different microstructures: 304 is austenitic stainless steel, which has good toughness and corrosion resistance; 403 is martensitic stainless steel, which has high hardness and strength.
Corrosion resistance: 304 stainless steel contains a higher proportion of nickel and chromium, and has better corrosion resistance, which can remain stable in humid or highly acidic and alkaline environments. Although 403 stainless steel also has certain corrosion resistance, it may be slightly inferior to 304 in certain specific media.
Processing performance: 304 stainless steel is easier to process, and is relatively simple whether it is cutting, welding or forming. 403 stainless steel is relatively easy to harden during processing, requiring more skill and attention.
Application fields: Due to the above differences, the two are also different in application fields. 304 is widely used in chemical, food, medical and other fields; while 403 is more used in automotive, medical equipment and kitchenware industries.
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