Blackened steel pipes undergo a blackening treatment that gives them their characteristic dark appearance. After forming, black steel pipes go through a blackening process to achieve their dark appearance.
The most common method is hot-dip galvanization or hot-dip blackening. In hot-dip galvanization, the pipes are immersed in molten zinc, which reacts with the steel surface, forming a protective zinc-iron alloy coating. This results in the matte-black appearance of black steel pipes.
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