Steel with high tempering resistance

Abstract

STEEL WITH HIGH TEMPERING RESISTANCE comprising a composition of alloying elements consisting essentially of, in percent by mass, C between 0.20 and 0.50, Si lower than 1.0, P lower than 0.030, Cr between 3.0 and 4.0, Mo between 1.5 and 4.0, V between 0.1 and 2.0, Co lower than 1.5, being the remaining composed of Fe and inevitable deleterious substances. The steel is produced by processes involving ingot casting and hot/cold forming, or used with the cast structure; or by processes involving atomization or dispersion of the molten metal, such as powder metallurgy, powder injection or spray forming.

1 - 10 . (canceled) 
     
     
         11 . STEEL WITH HIGH TEMPERING RESISTANCE comprising a composition of alloying elements consisting essentially of, in percentage by mass, C between 0.20 and 0.50, Si at maximum 0.30, P lower than 0.030, Cr between 3.0 and 4.0, Mo between 1.5 and 4.0, V between 0.1 and 2.0, Co lower than 1.5, being the remaining composed of Fe and inevitable deleterious substances. 
     
     
         12 . STEEL WITH HIGH TEMPERING RESISTANCE, according to  claim 11 , comprising a composition of alloying elements consisting essentially of, in percentage by mass, C between 0.30 and 0.50, Si at maximum 0.30, P lower than 0.020, Cr between 3.0 and 4.0, Mo between 2.0 and 3.0, V between 0.1 and 1.0, Co lower than 1.0, being the remaining composed of Fe and inevitable deleterious substances. 
     
     
         13 . STEEL WITH HIGH TEMPERING RESISTANCE, according to  claim 12 , comprising a composition of alloying elements consisting essentially of, in percentage by mass, C between 0.30 and 0.45, Si at maximum 0.30, P lower than 0.015, Cr between 3.2 and 3.9, Mo between 2.0 and 3.0, V between 0.3 and 1.0, Co lower than 1.0, being the remaining composed of Fe and inevitable deleterious substances. 
     
     
         14 . STEEL WITH HIGH TEMPERING RESISTANCE, according to  claim 13 , comprising a composition of alloying elements consisting essentially of, in percentage by mass, C between 0.30 and 0.40, Si at maximum 0.30, P lower than 0.010, Cr between 3.5 and 3.9, Mo between 2.2 and 2.8, V between 0.3 and 0.8, Co lower than 0.5, being the remaining composed of Fe and inevitable deleterious substances. 
     
     
         15 . STEEL WITH HIGH TEMPERING RESISTANCE according to  claim 11 , wherein a Mo/W replacement ratio is 1 Mo:2 W. 
     
     
         16 . STEEL WITH HIGH TEMPERING RESISTANCE according to  claim 11 , wherein a Vanadium: Niobium/Titanium replacement ratio is 1 V:2 Nb/1 Ti. 
     
     
         17 . USE OF STEEL WITH HIGH TEMPERING RESISTANCE according to  claim 11 , for molds, dies and multiple-use tools, for formation of solid or liquid materials, at room temperature or at temperatures up to 1300° C. 
     
     
         18 . USE OF STEEL HIGH RESISTANCE TEMPERING according to  claim 11 , for metal-forming tools subject to temperatures between 300 and 1300° C., and also to other applications such as forging, extrusion or casting ferrous or nonferrous alloys.