What is the difference between 410, 420, and 440C stainless steel？

What is 410 stainless steel?
It belongs to martensitic high-strength chromium steel, mainly composed of iron and chromium. The chromium content is generally around 11.5% -13.5%, and the carbon content is between 0.15% -0.25%. It has high hardness and good wear resistance, but poor corrosion resistance

What is 420 stainless steel?
It is also a martensitic steel with a chromium content of around 12% -14% and a carbon content higher than 410, generally between 0.2% -0.4%. It is known as "cutting tool grade" steel, commonly used in surgical knives, with good polishing properties and high hardness

 

What is 440C stainless steel?
Both are martensitic steels with a high carbon content (about 1.0% -1.3%) and a chromium content of 16% -18%. After appropriate heat treatment, high hardness and wear resistance can be obtained, commonly used in the production of high demand cutting tools such as razor blades

 

What is the application scenario?
410 stainless steel: commonly used for components such as knives, scissors, bearings, etc. that require high strength and wear resistance
420 stainless steel: suitable for surgical knives, high-end tableware and other occasions that require high polishing and hardness
440C stainless steel: mainly used for making razor blades, bearings and other components that require extremely high hardness and wear resistance

 

What is the corrosion resistance of 410 stainless steel?

The corrosion resistance of 410 stainless steel is limited to neutral or weakly corrosive environments, and it is sensitive to chloride ions and strong acids and bases. It requires surface treatment and regular maintenance to extend its service life. When selecting materials, it is necessary to comprehensively evaluate the environmental corrosiveness and mechanical performance requirements