Composite assembly of die steel core and stainless steel coating

Claim 1

A HEAT TREATED COMPOSITE ASSEMBLY HAVING EXCELLENT STRENGTH DUCTILITY AND CORROSION RESISTANCE WHEN USED AT TEMPERATURES OF UP TO 1000*F. CONSISTING OF, AUSTENITIC STAINLESS STEEL SURFACE LAYERS AND AN AIR HARDENING HOT WORK DIE STEEL CORE INTEGRALLY BONDED TOGETHER, THE STAINLESS STEEL OF THE SURFACE LAYERS HAVING A COMPOSITION COMPRISING, UP TO 0.25% CARBON, LESS THAN 15.0% MANGANES, UP TO 1.5% SILICON, FROM 12.0% TO 20.0% CHROMIUM, FROM 3.5% TO 10.0% NICKEL, LESS THAN 3.5% MOLYBDENUM, LESS THAN 0.15% NITROGEN, AND THE BALANCE ION, THE AIR HARDENING HOT WORK DIE STEEL OF THE CORE HAVING A COMPOSITION FROM 0.25% TO 0.45% CARBON, FROM 0.15% TO 0.60% MANGANESE, FROM 0.70% TO 1.20% SILICON FROM 4.5% TO 6.0% TO 1.75% MOLYB0.10% TO 1.2% VANADIUM, FROM 0.9% TO 1.75* MOLYBDENUM, UP TO 1.5% TUNGSTEN, UP TO 2.0% NICKEL AND THE BALANCE IRON, AND WHICH HAS BEEN HEATED TO A TEMPERATURE IN THE RANGE BETWEEN 1850*F. AND 2050*F., AIR QUENCHED TO ROOM TEMPERATURE, AND TEMPERED AT A TEMPERATURE IN THE RANGE BETWEEN 850*F. AND 1050*F.