420 stainless steel is suitable for all kinds of precision machinery steel balls, bearing steel balls, electrical equipment steel balls, transportation steel balls, transportation tools steel balls, household appliances steel balls, lock steel balls, fishing tackle steel balls, turntable steel balls, and rail steels Balls, steel balls for pulleys, steel balls for measuring tools, etc. It is mostly used to manufacture parts that are resistant to atmospheric, water vapor, water and oxidizing acid corrosion