0000811596 2020-07-31 2020-07-31 false 0000811596 8-K 2020-07-31 KAISER ALUMINUM CORPORATION DE 1-09447 94-3030279 27422 Portola Parkway, Suite 200 Foothill Ranch, CA 92610-2831 949 614-1740 false false false false Common Stock, par value $0.01 per share KALU NASDAQ false