1 and A series stainless steels mainly contain about 17% chromium and about 8% nickel, with 304 stainless steel as the typical representative, and B series stainless steel contains 13% chromium, with 420 stainless steel as the typical representative.
2.a series stainless steel is widely used in food processing, chemical industry, pharmacy, medical equipment, building decoration and other fields, while B series stainless steel is usually used in fields that require high hardness, such as knives, blades and mechanical parts.