the new aging practice yields significant improvement in throughput via decreased total aging time and with similar strength and corrosion resistance indeed alloy 7255 14 realizes about the same strength as conventionally aged 7255 1 but with only 4 25 hours of total aging time not including ramp up time and cool down time as compared to the total aging time of about 30 hours not including ramp up time and cool down time for alloy 7255 1 the 7255 14 alloy also realizes comparable corrosion resistance to alloy 7255 1 improved corrosion resistance is realized by alloys 7255 15 and 7255 16 over alloy 7255 1 with comparable strength and with only 4 5 5 0 hours of total aging time not including ramp up time and cool down time russian alloy 1980 having the composition shown in table 24 was produced as a conventional rod product e g homogenized extruded to rod solution heat treated and cold water quenched having an outer diameter of about 7 0 inches and a thickness of about 1 3 inches after about 0 5 1 days of natural aging the 1980 alloy rod was multi step aged for various times at various temperatures as shown in table 25 after aging mechanical properties were measured in accordance with astm e8 and b557 the results of which are shown in table 26 stress corrosion cracking scc resistance for some of the alloys.