Method of manufacturing Graphite Steel Rod for machine structural use having lower decarburized surf

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The present invention refers to mechanical parts, such as automobiles and industrial machine to suitable for use in for mechanical structure with an graphite relates to manufacturing method of steel wire, billet in river side rolling process carbon on the surface of, most of the blow-by decarburisation ferrite low employment degree wire billet in rolling process the decarbonization formed on the surface of the surface reflected to the speed for reducing the thickness the coal seam which burns graphite for use in machine structure is provided to manufacturing method of steel wire, is is connected. The present invention refers to, to % weight, carbon : 0.30-0.70%, silicon : 2.0-4.0%, manganese : 0.1-1.0%, in : 0.01-0.15%, sulfur : 0.01% hereinafter, [...] (Se) : 0.001-0.05%, titanium : 0.001-0.03%, boron : 0.001-0.003%, aluminum : 0.002-0.01%, nitrogen : 0.004-0.008%, oxygen : containing 0.005% hereinafter, nickel herein : 0.05-1.0%, copper : 0.01-0.5%, calcium : 0.0001-0.05%, zirconium : 0.0005-0.008%, rare earth metal : 0.001-0 . 05% 1 selected from the group consisting of one or at least one 2, remaining Fe and other unavoidable impurities is composed, said titanium (Ti), nitrogen (N), boron (B) and aluminum manganese while satisfies the relation N≤ 5.5/2.0 ≤ (Ti+5B +Al), then relationship (Se) and sulfur [...] , 1.0 ≤ (5 +Se/Mn)/ 5S ≤ 3.0 to obtain an bloom on the; cooled piling up 600±100 °C bloom said step; said 1260±30 °C in a range of bloom 100±20 minutes and the heating includes obtaining billet by river side rolling ; said billet 1050±50 °C to 10 °C/min. heating rate on heating temperature of temperature is at elevated temperatures in the rolling wire rods 30 on cap has been erased includes obtaining an the wire material a surface decarburized the steel wire material graphite for use in machine structure. and the NH4Cl has 1 : 2 : 2 of a manufacturing method.