FIELD: chemical and thermal metal working. SUBSTANCE: method of treating pieces of steel containing at least 0.2% carbon suitable for use in chemical, machine building, and other industries consists in a preliminarily applying on a piece a molybdenum layer using diffusion saturation technique and subsequent diffusion chrome-plating conducted for 0.25-30 h at 800- 1100 C. Thickness of the molybdenum layer is 0.5-50 micron. EFFECT: corrosion-protecting covers obtained. 1 tbl
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