cast steel shot
The cast steel shot finished black Casting is to melt the steel and then poured into the sand mold in the molding, and then cooled the casting. Therefore, the black surface of the cast steel shot is the color of the iron oxide formed by the chemical reaction of the high temperature steel surface and the oxygen in the air. Ferrous oxide, also known as iron oxide. Chemical formula FeO. Black powder; Melting point 1369 ± 1 ° C, relative density 5.7; Do not dissolve in water, alcohol and lye, soluble in acid; very unstable, heated in air quickly oxidized to ferric oxide.
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