The surface of stainless steel non-standard screws is difficult to hot-dip galvanize, but stainless steel non-standard screws can be blackened on the surface. The new blackening project of stainless steel, for a variety of stainless steel, 301, 304, 1Cr13, 2Cr13, ferritic stainless steel and other raw materials with high nickel content, can be blackened into matte black, bright black, well-proportioned color, and very good film It is firm, and a product can be by environmental protection.

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