The difference between coloring steel wire through low-temperature annealing and bluing, and their purposes.
[Reproduction of Private Spring Preparatory School Lecture 41] Low-temperature annealing is commonly referred to as bluing! The blue color is the color of the iron oxide film formed on the surface of the steel.
When you anneal shiny steel wires like piano wire or hard steel wire in the air, they develop a bluish color. Since blue is the color of the bluebird, this is likely why low-temperature annealing is referred to as bluing. This blue color is the result of a layer of iron oxide that forms on the surface of the steel. Although this oxide layer is very thin, it is strong, dense, and has considerable corrosion resistance. However, the colors produced by bluing are not limited to just blue. *For more detailed information, please refer to the PDF. Feel free to contact us for further inquiries.*
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