The present disclosure relates to a method for producing a coating film having high heat resistance, high hardness and wear resistance, a coating film having high heat-resistance, high hardness and wear resistance produced using the method, and a cutting tool including the same. The method includes forming a metal nitride layer on a metal base; forming a carbon layer on the metal nitride layer; and irradiating a laser into the carbon layer to add carbons into a portion of the metal nitride layer, thereby to form a carburized layer.

A guiding member, having a body provided with a bore for mounting a mobile element is presented. The body consists of a metallic material. The bore has a surface layer treated against jamming over a diffusion depth of less than or equal to 0.6 mm. The surface layer has a hardness of greater than or equal to 500 Hv1 over a depth of between 5 and 50 ?m.

A guiding member, having a body provided with a bore for mounting a mobile element is presented. The body consists of a metallic material. The bore has a surface layer treated against jamming over a diffusion depth of less than or equal to 0.6 mm. The surface layer has a hardness of greater than or equal to 500 Hv1 over a depth of between 5 and 50 ?m.

Materials, methods and techniques relate to steel alloys. In some instances, steel alloys can include chromium, molybdenum, vanadium, copper, nickel, manganese, niobium, aluminum, and iron. In some instances, exemplary steel alloys are subjected to solution carburizing, tempering, and/or plasma nitriding. Exemplary steel alloys are typically precipitation strengthened carburizable and nitridable steel alloys.

Steel for manufacturing cemented steel parts, characterized in that the composition thereof in weight percentages is: 0.1%C0.15%; 0.8%Mn2%; 1%Cr2.5; 0.2%Mo0.6%; trace elementsSi0.35%; trace elementsNi0.7%; trace elementsB0.005%; trace elementsTi0.1%; trace elementsN0.01% if 0.0005%(5ppm)B0.005%, and trace elementsN0.02% if trace elementsB0.0005%(5ppm); trace elementsAl0.1%; trace elementsV0.3%; trace elementsP0.025%; trace elementsCu1%, preferably0.6%; trace elementsS0.1%;
the remainder being iron and impurities resulting from production. A cemented steel part made with this steel, and to the method for manufacturing same.

Steel for manufacturing cemented steel parts, characterized in that the composition thereof in weight percentages is: 0.1%C0.15%; 0.8%Mn2%; 1%Cr2.5; 0.2%Mo0.6%; trace elementsSi0.35%; trace elementsNi0.7%; trace elementsB0.005%; trace elementsTi0.1%; trace elementsN0.01% if 0.0005%(5ppm)B0.005%, and trace elementsN0.02% if trace elementsB0.0005%(5ppm); trace elementsAl0.1%; trace elementsV0.3%; trace elementsP0.025%; trace elementsCu1%, preferably0.6%; trace elementsS0.1%;
the remainder being iron and impurities resulting from production. A cemented steel part made with this steel, and to the method for manufacturing same.

A carburizer, which effects carburization with respect to molten iron accommodated in an electric furnace or a ladle, includes a mixture of quicklime and a carbon material having an ash content of from 5 mass % to 18 mass %, and satisfies the conditions 0.6(mc+Mc)/ms2.7 and 0.7(mc+Mc)/ma6.5. A method of carburization uses this carburizer. Here, mc represents the mass of CaO in the carbon material, ms represents the mass of SiO.sub.2 in the carbon material, ma represents the mass of Al.sub.2O.sub.3 in the carbon material, and Mc represents the mass of the quicklime.