Common stainless steel: stainless steel with chrome, containing Cr ≥ 12%; stainless steel with nickel-chrome, containing Cr ≥ 18%, containing Ni ≥ 12%.
Classification of the metallographic structure of stainless steel: There are austenitic stainless steels, such as: 1Cr18Ni9Ti, 1Cr18Ni11Nb, Cr18Mn8Ni5. Martensitic stainless steel, such as: Cr17, Cr28, etc. Generally called non-magnetic stainless steel and magnetic stainless steel.
Common methods of treating stainless steel surfaces
Commonly used stainless steel surface treatment techniques have the following treatment methods: (1) natural surface whitening treatment; (2) mirror surface brightness treatment; (3) surface coloring treatment.
Natural surface whitening treatment: In the processing process, stainless steel undergoes a winding, bonding, welding or heating treatment to the fireworks to produce a black oxide skin. This hard grey-black oxide shell consists mainly of NiCr2O4 and NiF, two components of EO 4. In the past, hydrofluoric acid and nitric acid were generally used to eliminate strong corrosion. However, this method is expensive, pollutes the environment, harmful to the human body and corrosive, and is phased out.
