Corrosion resistant high chromium ferritic stainless steel

Claim 1

A STAINLESS STEEL HAVING A SUBSTANTIALLY FERRITIC MICROSTRUCTURE AND CHARACTERIZED BY GOOD RESISTANCE TO CORROSIVE ENVIRONMENTS SUCH AS STAGNANT SEAWATER WHILE CONCOMITANTLY DISPLAYING GOOD NOTCH TOUGHNESS, SAID STEEL CONSISTING ESSENTIALLY OF FROM 30 TO ABOUT 36% CHROMIUM, FROM 0.5 UP TO ABOUT 5% MOLYBDENUM, UP TO 3% SILICON, WITH THE PROVISOS THAT THE "CMS" INDICATOR REPRESENTED BY THE SUM OF THE CHROMIUM PLUS THREE TIMES THE AMOUNT OF MOLYBDENUM PLUS THREE TIMES THE PERCENTAGE OF SILICON IS NOT LESS THAN 34%, NOR ABOVE ABOUT 48% WHERE GOOD WORKABILITY IS DESIRED, ABOUT 2 TO ABOUT 8% NICKEL, UP TO LESS THAN 2% TITANIUM, UP TO ABOUT 2% VANADIUM AND UP TO ABOUT 2% COLUMBIUM, WITH AT LEAST ONE ELEMENT FROM THE GROUP CONSISTING OF TITANIUM, VANADIUM AND COLUMBIUM BEING PRESENT IN A SMALL BUT EFFECTIVE AMOUNT TO ENHANCE THE CORROSION RESISTANCE IN RESPECT OF STEELS PRODUCED BY AIR MELTING AND IN WHICH THE "CMS" INDICATOR IS NOT ABOVE ABOUT 41%, THE SUM TOTAL OF TITANIUM, VANADIUM AND COLUMBIUM NOT EXCEEDING CABOUT 4%, UP TO 0.1% CARBON, UP TO 2% ALUMINUM, UP TO ABOUT 2% MANGANESE, UP TO ABOUT 10% COBALT, UP TO ABOUT 4% TUNGSTEN, AND THE BALANCE ESSENTIALLY IRON.