Method for producing tools from steel alloy and tools, in particular for machining metal

摘要

The method comprises: melting an alloy with a chemical composition comprising carbon (0.7-1.3 wt.%), silicon (0.1-1 wt.%), manganese (0.1-1 wt.%), chromium (3.5-5 wt.%), molybdenum (0.1-10 wt.%), tungsten (0.1-19 wt.%), vanadium (0.8-5 wt.%) and cobalt (up to 8 wt.%) and aluminum, nitrogen, and iron, except for the element aluminum, and heating the alloy to a temperature of 80-250[deg] C above the liquidus temperature and deoxidizing the alloy to produce a steel melt; and optionally covering the melt surface with a metallurgically active oxides-dissolving and nitrides-dissolving slag. The method comprises: melting an alloy with a chemical composition comprising carbon (0.7-1.3 wt.%), silicon (0.1-1 wt.%), manganese (0.1-1 wt.%), chromium (3.5-5 wt.%), molybdenum (0.1-10 wt.%), tungsten (0.1-19 wt.%), vanadium (0.8-5 wt.%) and cobalt (up to 8 wt.%) and aluminum, nitrogen, and iron, except for the element aluminum, and heating the alloy to a temperature of 80-250[deg] C above the liquidus temperature and deoxidizing the alloy to produce a steel melt; optionally covering the melt surface with a metallurgically active oxides-dissolving and nitrides-dissolving slag, which is partially melted; adding aluminum (0.4-1.3 wt.%) into the melt such that the aluminum is distributed homogeneously; stirring the melt so that aluminum nitrides of liquid steel are dissolved in the slag or are adjusted in the steel to a maximum diameter of 34 mu m, and the nitrogen content is reduced to less than 0.02 wt.%; introducing magnesium into the melt and allowing it to react in the melt; adjusting the melt to a desired casting temperature, and casting it to produce an ingot; machining the ingot to produce an object in a desired tool shape; thermal hardening the shaped tool with a single austenitization at a temperature below 1160[deg] C with a dwell period of maximum 15 minutes; tempering the shaped tool at a temperature of 500-600[deg] C; and chipping the machining allowance of the tool. The aluminum is alloyed to the deoxidized melt. An independent claim is included for a tool for a chip-removing machining of metallic materials formed from an alloyed steel with a chemical composition.