Patent ID: 8444776

Claim:
A process for making an alloy article comprising: austenitizing an alloy article by heating the alloy article at a temperature of at least 1450° F. for at least 15 minutes minimum furnace time, the alloy comprising, in weight percentages based on total alloy weight: 0.40 to 0.53 carbon; 0.15 to 1.00 manganese; 0.15 to 0.45 silicon; 0.95 to 1.70 chromium; 3.30 to 4.30 nickel; 0.35 to 0.65 molybdenum; 0.0002 to 0.0050 boron; 0.001 to 0.015 cerium; 0.001 to 0.015 lanthanum; no greater than 0.002 sulfur; no greater than 0.015 phosphorus; no greater than 0.011 nitrogen; iron; and incidental impurities; cooling the alloy article from the austenitizing temperature in still air; and tempering the alloy article at a temperature of 250° F. to 500° F. for 450 minutes to 650 minutes time-at-temperature, directly after the cooling in still air, thereby providing a tempered alloy article exhibiting a hardness greater than 570 BHN.