The Boeing Company
STEEL ALLOY AND METHOD FOR HEAT TREATING A STEEL ALLOY ARTICLE

Abstract:

A steel alloy includes about 1.65 to about 2 percent by weight nickel (Ni), about 0.7 to about 0.9 percent by weight chromium (Cr), about 0.6 to about 0.9 percent by weight manganese (Mn), about 0.58 to about 0.63 percent by weight carbon (C), about 0.25 to about 0.35 percent by weight niobium (Nb), about 0.15 to about 0.35 percent by weight silicon (Si), about 0.2 to about 0.3 percent by weight molybdenum (Mo), about 0.005 to about 0.01 percent by weight boron (B), and iron (Fe).