Alloy articles for use at high temperatures

Claim 1

AN ALLOY ARTICLE FOR SERVICE AT ELEVATED TEMPERATURES UPWARDS OF 700*F. AND HAVING GREAT STRENGTH AND STABILITY WHEN SUBJECTED TO SXEVERE STRESSES FOR PROLONGED PERIODS AT SUCH ELEVATED TEMPERATURES, SAID ARTICLE BEING COMPOSED OF A MACHINABLE, WELDABLE, CASTABLE AND HOT-WORKABLE ALLOY CONSISTING OF 10% TO 30% CHROMIUM; 10% TO 45% COBALT; 0% TO 7.5% MOLYBDENUM; 0.5% TO 15% TUNGSTEN, THE TUNGSTEN CONTENT BEING AT LEAST 7.5% IN THE ABSENCE OF MOLYBDENUM; 0.01% TO 3% IN THE AGGREGATE OF AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF BORON AND ALUMINUM, THE MAXIMUM BORON CONTENT BEING 0.7% AND THE MINIMUM ALUMINUM CONTENT IN THE ABSENCE OF BORON BEING 0.5%; CARBON IN AN AMOUNT NOT EXCEEDING 0.35%; NTIROGEN IN AN AMOUNT NOT EXCEEDING 0.25%; THE REMAINDER BEING IRON AND INCIDENTAL IMPURITIES.