Tool steel for extrusion

Abstract

The present invention relates to a steel for extrusion tools characterized for lower cost and tempering resistance higher than that of conventional steel H13, whose chemical composition, in percentage by mass, comprises the following: Carbon between 0.40 and 0.60, Silicon below 1.0, Phosphorus below 0.030; Chromium between 2.5 and 4.5; Molybdenum between 0.5 and 0.7, considering that molybdenum can be replaced by tungsten in a ratio=2W/1Mo; Vanadium between 0.10 and 1.0; Manganese below 1.0; the remainder consisting essentially of Fe and inevitable deleterious substances. As an option to provide high hardness after nitriding, the Al content of the steel of the present invention can be ≦1.0; for high toughness purposes, however, this Al content should be kept below 0.10.

1 - 16 . (canceled) 
     
     
         17 . STEEL FOR EXTRUSION TOOLS, characterized by a composition of alloying elements that comprise, in percent by mass: carbon between 0.40 and 0.60, silicon below 1.0, phosphorus below 0.030, chrome between 2.5 and 4.5, molybdenum between 0.5 and 0.7, vanadium between 0.10 and 1.0, manganese below 1.0, aluminum between 0.1 and 1.0, being the remaining composed of Fe and inevitable deleterious substances. 
     
     
         18 . STEEL FOR EXTRUSION TOOLS, characterized by a composition of alloying elements that comprise, in percent by mass, carbon between 0.40 and 0.60, silicon below 0.50, phosphorus below 0.030, chrome between 3.0 and 4.2, molybdenum between 0.55 and 0.65, vanadium between 0.30 and 0.8, manganese below 0.8, aluminum between 0.2 and 0.80, being the remaining composed of Fe and inevitable deleterious substances. 
     
     
         19 . STEEL FOR EXTRUSION TOOLS, characterized by a composition of alloying elements consisting essentially of, in percent by mass, carbon between 0.45 and 0.55, silicon below 0.5, phosphorus below 0.030, chrome between 3.5 and 4.2, molybdenum between 0.55 and 0.65, vanadium between 0.30 and 0.50, manganese below 0.50, aluminum between 0.4 and 0.60, being the remaining composed of Fe and inevitable deleterious substances. 
     
     
         20 . STEEL FOR EXTRUSION TOOLS, according to  claim 17 , characterized by having molybdenum replaced with tungsten in a ratio of 1Mo=2W. 
     
     
         21 . STEEL FOR EXTRUSION TOOLS, according to  claim 17 , characterized by having vanadium replaced with niobium or titanium in a ratio of 1V=2Nb or 1Ti. 
     
     
         22 . STEEL FOR EXTRUSION TOOLS, according to  claim 17 , characterized by being applied to molds, dies and general usage tools, for forming solid and liquid materials, at room temperature or temperatures at 1300° C. 
     
     
         23 . STEEL FOR EXTRUSION TOOLS, according to  claim 17 , characterized by being applied to tools for forming metals at temperatures between 300 and 1300° C., in applications of forging, extrusion or casting of ferrous or non-ferrous alloys. 
     
     
         24 . STEEL FOR EXTRUSION TOOL, according to  claim 17 , characterized by being applied to non-ferrous alloy hot extrusion tools, particularly aluminum alloys, and to solid shape or pipe extrusion dies. 
     
     
         25 . STEEL FOR EXTRUSION TOOL, according to  claim 17 , characterized by being produced for processes involving casting of billets and hot and cold forming, or even used with the gross structure of melting. 
     
     
         26 . STEEL FOR EXTRUSION TOOL, according to  claim 17 , characterized by being produced for processes involving fragmentation of liquid metal, such as powder metallurgy, powder injection or the process of forming by spray