Steel Alloy, Use of Such a Steel Alloy, and Component

Abstract

The invention relates to a steel alloy comprising, in percent by mass:—0.17 to 0.23 carbon;—1.40 to 1.60 silicon;—0.50 to 0.60 manganese;—up to 0.020 phosphor;—up to 0.020 sulfur;—up to 0.30 chrome;—up to 0.12 molybdenum;—up to 0.80 nickel;—up to 0.30 copper;—up to 0.03 vanadium; the remainder being iron and incidental impurities.

1 . A steel alloy comprising, in percent by mass:
 0.17 to 0.23 carbon;   1.40 to 1.60 silicon;   0.50 to 0.60 manganese;   up to 0.020 phosphor;   up to 0.020 sulfur;   up to 0.30 chrome;   up to 0.12 molybdenum;   up to 0.80 nickel;   up to 0.30 copper;   up to 0.03 vanadium;   the remainder being iron and incidental impurities.   
     
     
         2 . The steel alloy according to  claim 1 ,
 wherein the steel alloy is a steel cast alloy.   
     
     
         3 . The steel alloy according to  claim 2 ,
 wherein the steel alloy as cast has a Brinell hardness of at least 190 HBW 5/750 and/or a yield point of at least 300 megapascal.   
     
     
         4 . A method of manufacturing an article, the method comprising casting the steel alloy according to  claim 1  to form the article. 
     
     
         5 . The method of  claim 4 ,
 further comprising subjecting the article to a heat treatment after casting.   
     
     
         6 . The method of  claim 5 ,
 wherein the heat treatment comprises a normalizing of the article.   
     
     
         7 . The method of  claim 6 ,
 wherein the normalizing is carried out in a temperature range extending from 900 degrees centigrade to 980 degrees centigrade.   
     
     
         8 . The method of  claim 5 ,
 wherein after the heat treatment the steel alloy has a tensile strength of at least 560 megapascal and/or a yield point of at least 370 megapsacal and/or an elongation at break of at least 20% and/or a Vickers hardness of at least 180 HV10 and/or a tensile ductility of at least 27 joule.   
     
     
         9 . The method of  claim 5 ,
 wherein the heat treatment creates a homogeneous perlitic-ferritic structure and during the heat treatment a carbonization and a decarbonization of the article are omitted.   
     
     
         10 . A component of a vehicle, the component cast from a steel alloy according to  claim 1 . 
     
     
         11 . The component of  claim 10 ,
 wherein the component is a body component for a body in white or an integral body of a vehicle.   
     
     
         12 . The component of  claim 11 ,
 wherein the body component is a dome.