There are several different techniques and each one has its own particular uses.
Blue steel sheet metal.
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C1008 1010 hr steel sheet astm a1011 a569 hot rolled steel sheets are the most economical steel sheets available for a wide variety of applications hr steel sheets are easy to weld form and drill and has a slight grainy surface.
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Bluing is a passivation process in which steel is partially protected against rust and is named after the blue black appearance of the resulting protective finish true gun bluing is an electrochemical conversion coating resulting from an oxidizing chemical reaction with iron on the surface selectively forming magnetite fe 3 o 4 the black oxide of iron.
Popular uses for hr steel sheet include.
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Bluing steel is the process of oxidizing the surface of the metal to protect it from rust.
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Before any bluing process the metal must be prepared.
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The most commonly used are cold bluing and hot bluing but rust bluing was the standard for many years.
Magnetic brinell 95.