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A chemical treatment applied to ferrous metals to improve their corrosion resistance. The process is based on a manganese phosphate solution, which produces a fairly thick coating. This can subsequently be painted or impregnated with oil. Patenting A heat treatment process often applied to high carbon wire. The steel is heated to a suitable temperature well above the transformation range, followed by cooling in air or a bath of molten lead or salt. A structure is produced suitable for subsequent cold drawing and which will give the desired mechanical properties in the finished state.
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