420-- mirror plastic mold steel corrosion
Characteristics: have some wear and corrosion resistance, high hardness, its price is lower stainless steel ball in a class for the general requirements for stainless steel work environment.
Uses:
Applicable to all types of precision machinery, bearings, electrical, equipment, apparatus, instruments, transport, and household appliances.
For the manufacture of multi-resistant to atmospheric water vapor, water and oxidizing acid corrosion of components.