The main differences between 403 and 304 stainless steels are chemical composition, organizational structure, corrosion resistance, toughness and application areas.
Chemical composition
403 stainless steel: It is a martensitic stainless steel, containing 16%-18% chromium and basically no nickel.
304 stainless steel: It is an austenitic stainless steel, containing chromium and nickel, with 18% chromium and about 8% nickel.
Organization structure
403 stainless steel: The microstructure is martensite, with high hardness and strength, suitable for applications with high pressure or sharp edges.
304 stainless steel: The microstructure is austenite, with good toughness and strong corrosion resistance, suitable for food processing, medical equipment, chemical equipment and other fields.
Corrosion resistance and toughness
403 stainless steel: Poor corrosion resistance and weak toughness.
304 stainless steel: Strong corrosion resistance and high toughness, suitable for use in humid or liquid environments. 13.
Application areas
403 stainless steel: often used in places where high hardness and high strength are required, such as knives, bearings, etc.
304 stainless steel: widely used in food processing, medical equipment, chemical equipment and other fields due to its good corrosion resistance and toughness.
Magnetism
304 stainless steel: usually non-magnetic or weakly magnetic, suitable for places where magnetic interference needs to be avoided.
403 stainless steel: has magnetic properties and is suitable for parts that need to utilize magnetic properties.
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