Patent ID: 9657363
Date: 2017-05-23
CPC Classifications: C21D,C22C

Claim:
1. A temper heat treated air hardenable auto tempered steel alloy consisting of, in percent by weight: 0.18 to 0.26 carbon; 3.50 to 4.00 nickel; 1.60 to 2.00 chromium; 0 up to 0.50 molybdenum; 0.80 to 1.20 manganese; 0.25 to 0.45 silicon; 0 to less than 0.005 titanium; 0 to less than 0.020 phosphorus; 0 up to 0.005 boron; 0 up to 0.003 sulfur; iron; and incidental impurities; and wherein after temper heat treating the steel alloy for a tempering time in a range of 4 hours to 10 hours and at a tempering temperature in a range of 300° F. (149° C.) to 450° F. (232° C.), the temper heat treated air hardenable steel alloy has a Brinell hardness in a range of 360 HBW to 467 HBW.