Aluminum bearing precipitation hardening stainless steel of high retained toughness
Abstract
Abstract A PRECIPITATION-HARDDNABLE SEMI-AUSTENITIC STAINLESS STEEL WHICH BY VIRTURE OF PARTICULAR COMPOSITION BALANCE IS ESSENTIALLY FREE OF DELTA-FERRITE AND READILY LENDS ITSELF TO A VARIETY OF WORKING AND FORMING OPERATIONS, IS READILY HARDENED BY PRECIPITATION HEAT-TREATMENT, AND IN HARDENED CONDITION IS STRONG AND TOUGH, MAINTAINING ITS STRENGTH AND TOUGHNESS OVER LONG PERIODS OF USE AT ELEVATED TEMPERATURE. THE STEEL CONTAINS THE FOUR ESSENTIAL INGREDIENTS CHROMIUM, NICHEL, CARBON AND ELUMINUM IN CRITICAL AMOUNT AND PROPORTION, WITH REMAINDER ESSENTIALLY IRON. THE CHROMIUM CONTENT IS IN THE AMOUNT OF ABOUT 12% TO 19%, NICKEL ABOUT 7% TO 10%, CARBON ABOUT .03% TO .05%, AND ALUMINUM ABOUT .01% TO .48% TO .48%. THE INGREDIENTS MANGANESE, SILICON, PHOSPHORUS, SULPHUR AND NITROGEN COMMONLY PRESENT IN STAINLESS STEEL ARE MAINTAINED IN LOW AND CRITICAL AMOUNT. MOLYBDENUM MAY BE ADDED WHERE DESIRED.
Inventors
- 👤 Cameron Perry D
Bibliographic Details
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