| 摘要 |
PURPOSE:To manufacture a heat-resisting and high-strength steel wire having high strength and also having, owing to nitriding treatment, sufficient fatigue resistance and settling resistance even under severe service conditions, by working a low-alloy steel billet containing specific amounts of Cr, V, and Mo into a wire by means of hot rolling and cold wiredrawing. CONSTITUTION:A billet of low-alloy steel containing, by weight, 0.60-0.80% C, 1.30-1.80% Si, 0.40-0.70% Mn, 0.40-1.00% Cr, 0.20-0.60% V, and 0.10-0.25% Mo is hot-rolled so as to be worked into a wire rod. After heat treatment, such as patenting treatment, surface grinding is applied to the above wire rod to remove the surface defects of the wire rod, and successively, cold wiredrawing is applied to form the above wire rod into a wire in the final straight-line state, followed by final annealing. By this method, the heat-resisting and high-strength steel wire suitable, as high-strength steel wire, for material for piston rings and various fasteners and sufficiently capable of withstanding use, after formed into a spring, etc., and subjected to nitriding, even under severe service conditions of high stress, high temp., etc., can be obtained.
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