High temperature co-cr alloys

Claim 1

A COBALT-BASE ALLOY CAPABLE OF WITHSTANDING PROLONGED EXPOSURE TO MECHANICAL STRESS OF AT LEAST 31,500 POUNDS PER SQUARE INCH AT ELEVATED TEMPERATURES OF THE ORDER OF 1,500* F. AND ABOVE, SAID ALLOY CONTAINING 23% TO 36% CHROMIUM; 12% TO 16% TUNGSTEN; UP TO 3% MOLYBDENUM, THE SUM OF TUNGSTEN AND MOLYBDENUM NOT EXCEEDING 16%; 2% TO 15% NICKEL; 0.25% TO LESS THAN 2% MANGANESE; 0.3% TO 0.9% CARBON; UP TO 1% SILICON; UP TO 0.25% NITROGEN; LESS THAN 5% IRON; 0.25% TO 1.0% BORON, THE REMAINDER COBALT, THE COMPOSITION OF SAID ALLOY BEING SO BALANCED THAT WHEN ITS CHROMIUM CONTENT IS IN THE RANGE 23% TO 30% ITS CARBON CONTENT IS 0.30% TO LESS THAN 0.5%, ITS BORON CONTENT IS 0.25% TO 0.8% AND ITS MINIMUM COBALT CONTENT IS 45%; AND WHEN ITS CHROMIUM CONTENT IS IN THE RANGE 30% TO 36% ITS CARBON CONTENT IS 0.5% TO 0.9%, ITS BORON CONTENT IS 0.8% TO 1.0%, AND ITS MINIMUM COBALT CONTENT IS 35%.