1. Different performance: 420 stainless steel has a certain degree of wear resistance and corrosion resistance, high hardness, but slightly poorer corrosion resistance. 430 stainless steel has oxidation resistance, corrosion resistance, safety and non-toxicity, mechanical properties and process performance is poor.

2. Different species: 420 belongs to martensitic stainless steel. 430 stainless steel belongs to ferritic stainless steel.

3. Elemental content is different: 420 stainless steel carbon content is higher, carbon C: 0.30 ~ 0.40 Cr: 12.0 ~ 14.0. 430 stainless steel chromium content is higher, carbon (C) :≤ 0.12%, chromium (Cr) :16.00 ~ 18.00 %.

4. Processing process is different: 420 stainless steel can be heat hardening treatment, quenching, tempering to improve the hardness and surface wear strength. 430 stainless steel can be deep drawing treatment, thermal conductivity is better than austenitic, the coefficient of thermal expansion is smaller than austenitic.

5. Different uses: 420 stainless steel is mainly used for precision machinery, bearings, instruments, meters, transportation tools, etc. 430 is mainly used for nitric acid and food plant equipment, fuel burner parts, household appliances, home appliance parts, gas turbine parts.

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