Stainless steel application development prospects will be more and more widely, but the development of stainless steel applications to a large extent determine the extent of its surface treatment technology development.
First, stainless steel commonly used surface treatment methods
(A) Introduction to stainless steel varieties
Stainless steel main components: generally contain chromium (Cr), nickel (Ni), molybdenum (Mo), titanium (Ti) and other high-quality metal elements. Common stainless steel: chromium stainless steel, containing Cr ≥ 12% or more; nickel-chromium stainless steel, containing Cr ≥ 18%, containing Ni ≥ 12%. From the stainless steel metallographic structure classification: austenitic stainless steel, for example: 1Cr18Ni9Ti, 1Cr18Ni11Nb, Cr18Mn8Ni5. Martensitic stainless steel, for example: Cr17, Cr28 and so on. Commonly known as non-magnetic stainless steel and with magnetic stainless steel.
(B) common stainless steel surface treatment methods
Commonly used stainless steel surface treatment technology has the following methods: surface whitening treatment; surface mirror bright processing; surface coloring.
Surface whitening treatment: stainless steel in the processing process, after the coil, bar edge, welding or artificial surface roasted heating treatment, resulting in black oxide. This hard gray-black oxide is mainly NiCr2O4 and NiF two kinds of EO4 ingredients, before the general use of hydrofluoric acid and nitric acid for strong corrosion method to remove. But this method cost, pollution of the environment, harmful to humans, corrosive, and gradually be eliminated.
Stainless steel surface mirror bright treatment methods: According to the complexity of stainless steel products and user requirements can be different mechanical polishing, chemical polishing, electrochemical polishing and other methods to achieve specular gloss.
Surface coloring: Stainless steel coloring not only gives a variety of colors of stainless steel products, increase the variety of products, but also improve the product wear resistance and corrosion resistance.
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