Method for hardening a casting made of an aluminum alloy, more particularly with an AISiMg base, comprising 6 to 12, more particularly 6.5 to 11.5, wt.% of silicon (Si), 0.2 to 0.8, more particularly 0.25 to 0.6, wt.% of magnesium (Mg), 0.25 to 0.8 wt.% of manganese (Mn), optionally individually or in combination: up to 1.2 wt.% iron (Fe) up to 1.2 wt.% zinc (Zn) up to 2.0 wt.% copper (Cu) at most 0.2 wt.% titanium (Ti) at most 0.2 wt.% zirconium (Zr) at most 0.2 wt.% vanadium 50 to 300 ppm strontium (Sr) 20 to 250 ppm sodium (Na) 20 to 350 ppm antimony (Sb) and the remainder aluminum as well as unavoidable impurities due to the production process, having the following steps: solution annealing of the casting, first accelerated cooling of the solution-annealed casting and heat treatment of the casting, which heat treatment comprises a first holding at a first holding temperature in the range from 60 to 140°C and a second holding at a second holding temperature in the range from 150 to 250°C for a second holding time of less than or equal to 15 minutes and a subsequent second accelerated cooling at a cooling rate of at least 20°C/s, wherein the second holding with subsequent second accelerated cooling interrupts the first holding multiple times and thereby divides this first holding into holding sections, each at a first holding temperature in the range from 60 to 140°C and during a first holding time section (h1a, h1b, h1c, h1d, h1e) of less than or equal to 10 hours, which first holding time section (h1a, h1b, h1c, h1d, h1e) lasts longer than the second holding time. 6 to 12, more particularly 6.5 to 11.5, wt.% of silicon (Si), 0.2 to 0.8, more particularly 0.25 to 0.6, wt.% of magnesium (Mg), 0.25 to 0.8 wt.% of manganese (Mn), optionally individually or in combination: up to 1.2 wt.% iron (Fe) up to 1.2 wt.% zinc (Zn) up to 2.0 wt.% copper (Cu) at most 0.2 wt.% titanium (Ti) at most 0.2 wt.% zirconium (Zr) at most 0.2 wt.% vanadium 50 to 300 ppm strontium (Sr) 20 to 250 ppm sodium (Na) 20 to 350 ppm antimony (Sb) and the remainder aluminum as well as unavoidable impurities due to the production process, having the following steps: solution annealing of the casting, first accelerated cooling of the solution-annealed casting and heat treatment of the casting, which heat treatment comprises a first holding at a first holding temperature in the range from 60 to 140°C and a second holding at a second holding temperature in the range from 150 to 250°C for a second holding time of less than or equal to 15 minutes and a subsequent second accelerated cooling at a cooling rate of at least 20°C/s, wherein the second holding with subsequent second accelerated cooling interrupts the first holding multiple times and thereby divides this first holding into holding sections, each at a first holding temperature in the range from 60 to 140°C and during a first holding time section (h1a, h1b, h1c, h1d, h1e) of less than or equal to 10 hours, which first holding time section (h1a, h1b, h1c, h1d, h1e) lasts longer than the second holding time. up to 1.2 wt.% iron (Fe) up to 1.2 wt.% zinc (Zn) up to 2.0 wt.% copper (Cu) at most 0.2 wt.% titanium (Ti) at most 0.2 wt.% zirconium (Zr) at most 0.2 wt.% vanadium 50 to 300 ppm strontium (Sr) 20 to 250 ppm sodium (Na) 20 to 350 ppm antimony (Sb) and the remainder aluminum as well as unavoidable impurities due to the production process, having the following steps: solution annealing of the casting, first accelerated cooling of the solution-annealed casting and heat treatment of the casting, which heat treatment comprises a first holding at a first holding temperature in the range from 60 to 140°C and a second holding at a second holding temperature in the range from 150 to 250°C for a second holding time of less than or equal to 15 minutes and a subsequent second accelerated cooling at a cooling rate of at least 20°C/s, wherein the second holding with subsequent second accelerated cooling interrupts the first holding multiple times and thereby divides this first holding into holding sections, each at a first holding temperature in the range from 60 to 140°C and during a first holding time section (h1a, h1b, h1c, h1d, h1e) of less than or equal to 10 hours, which first holding time section (h1a, h1b, h1c, h1d, h1e) lasts longer than the second holding time. solution annealing of the casting, first accelerated cooling of the solution-annealed casting and heat treatment of the casting, which heat treatment comprises a first holding at a first holding temperature in the range from 60 to 140°C and a second holding at a second holding temperature in the range from 150 to 250°C for a second holding time of less than or equal to 15 minutes and a subsequent second accelerated cooling at a cooling rate of at least 20°C/s, wherein the second holding with subsequent second accelerated cooling interrupts the first holding multiple times and thereby divides this first holding into holding sections, each at a first holding temperature in the range from 60 to 140°C and during a first holding time section (h1a, h1b, h1c, h1d, h1e) of less than or equal to 10 hours, which first holding time section (h1a, h1b, h1c, h1d, h1e) lasts longer than the second holding time.