Al-casting alloy

Abstract

The invention relates to an Al casting alloy.

1 . An Al casting alloy containing at least five of the following alloy constituents:
 Si: 3.0% to 3.8% by weight   Mg: 0.3% to 0.8% by weight   Cr: 0.05% to 0.35% by weight   Fe: <0.18% by weight   Mn: <0.06% by weight   Ti: <0.16% by weight   Cu: 0.006-0.015% by weight   Sr: 0.010% to 0.030% by weight   Zr<0.006% by weight   Zn<0.006% by weight   Impurities: <0.1% by weight   and is supplemented by Al to an extent of 100% by weight in each case.   
     
     
         2 . The Al casting alloy as claimed in  claim 1 , wherein Si is present with a content of more than 3.1% by weight, preferably of more than 3.3% by weight, more preferably of more than 3.4% by weight. 
     
     
         3 . The Al casting alloy as claimed in  claim 1 , wherein Si is present with a content of less than 3.7% by weight, preferably of less than 3.5% by weight. 
     
     
         4 . The Al casting alloy as claimed in  claim 1 , wherein Mg is present with a content of more than 0.40% by weight, preferably of more than 0.50% by weight, more preferably of more than 0.55% by weight. 
     
     
         5 . The Al casting alloy as claimed in  claim 1 , wherein Mg is present with a content of less than 0.70% by weight, preferably of less 0.60% by weight. 
     
     
         6 . The Al casting alloy as claimed in  claim 1 , wherein Cr is present with a content of more than 0.10% by weight, preferably of more than 0.15% by weight, more preferably of more than 0.20% by weight, most preferably of more than 0.25% by weight. 
     
     
         7 . The Al casting alloy as claimed in  claim 1 , wherein Cr is present with a content of at most 0.30% by weight, preferably of less than 0.30% by weight. 
     
     
         8 . The Al casting alloy as claimed in  claim 1 , wherein Fe is present with a content of more than 0.01% by weight, preferably of more than 0.05% by weight, more preferably of more than 0.07% by weight. 
     
     
         9 . The Al casting alloy as claimed  claim 1 , wherein Fe is present with a content of less than 0.15% by weight, preferably of less than 0.12% by weight. 
     
     
         10 . The Al casting alloy as claimed in  claim 1 , wherein Mn is present with a content of more than 0.01% by weight, preferably of more than 0.02% by weight. 
     
     
         11 . The Al casting alloy as claimed in  claim 1 , wherein Mn is present with a content less than 0.15% by weight, preferably of less than 0.12% by weight, more preferably of less than 0.10% by weight. 
     
     
         12 . The Al casting alloy as claimed in  claim 1 , wherein Ti is present with a content of more than 0.01% by weight, preferably of more than 0.03% by weight, more preferably of more than 0.04% by weight. 
     
     
         13 . The Al casting alloy as claimed in  claim 1 , wherein Ti is present with a content of less than 0.10% by weight, preferably of less than 0.08% by weight, more preferably of less than 0.065% by weight, most preferably of less than 0.055% by weight. 
     
     
         14 . The Al casting alloy as claimed in  claim 1 , wherein Cu is present with a content of more than 0.006% by weight, preferably of more than 0.007% by weight, more preferably of more than 0.008% by weight, most preferably at least 0.009% by weight. 
     
     
         15 . The Al casting alloy as claimed in  claim 1 , wherein Cu is present with a content of less than 0.015% by weight, preferably of less than 0.013% by weight, more preferably of less than 0.012% by weight, most preferably of less than 0.011% by weight. 
     
     
         16 . The Al casting alloy as claimed in  claim 1 , wherein Sr is present with a content of more than 0.015% by weight, preferably of more than 0.020% by weight. 
     
     
         17 . The Al casting alloy as claimed in  claim 1 , wherein Sr is present with a content of less than 0.030% by weight, preferably of less than 0.025% by weight. 
     
     
         18 . The Al casting alloy as claimed in  claim 1 , wherein Zr is present with a content of more than 0.001% by weight. 
     
     
         19 . The Al casting alloy as claimed in  claim 1 , wherein Zr is present with a content of less than 0.005% by weight, preferably of less than 0.004% by weight, more preferably of less than 0.003% by weight. 
     
     
         20 . The Al casting alloy as claimed in  claim 1 , wherein Zn is present with a content of more than 0.001% by weight, preferably of more than 0.002% by weight. 
     
     
         21 . The Al casting alloy as claimed in  claim 1 , wherein Zn is present with a content of less than 0.005% by weight, preferably of less than 0.004% by weight. 
     
     
         22 . The Al casting alloy as claimed in  claim 1 , wherein impurities are present with a content of less than 0.05% by weight, preferably less than 0.035% by weight. 
     
     
         23 - 32 . (canceled) 
     
     
         33 . A cast component produced from an Al casting alloy as claimed in  claim 1 , wherein the cast component after a heat treatment has a yield point R P 0.2 of 300 to 330 MPa, preferably of >320 to 330 MPa, and/or an elongation at break A5 of 7% to 11%, preferably of 8.5% to 10%, more preferably of 9% to 9.5%, and/or a tensile strength R m  of 350-375 MPa, preferably of >360-375 MPa.