Restorable fe-cr-ni alloy

Claim 1

OBJECTS WHICH DURING THEIR USE ARE TO BE SUBJECTED TO TEMPERATURES OF AT LEAST 650*C. AND WHICH ARE NONSENSIBLE TO SUPERHEATING ABOVE THEIR TEMPERATURE OF UTILZATION BY RECOVERING THEIR STRENGTH AND HARDNESS WHEN THE TEMPERATURE IS RETURNED TO SAID TEMPERATURE OF UTILIZATION, CHARACTERIZED IN THAT THEY ARE PRODUCED FROM A NONPRECIPITATION HARDENING ALLOY OF AT LEAST PREDOMINANTINGLY AUSTENITIC STRUCTURE AND CONTAINING AT LEAST ONE OF THE GAMMA FORMING ELEMENTS NI AND MN WITHIN THE RANGE FROM 10% TO 45%, FROM A TRACE UP TO 1% OF AT LEAST ONE OF THE ELEMENTS V, MO AND W, AT LEAST 20% FE+CO, NOT MORE THAN 0.6% C, CR WITHIN THE RANGE FROM 13.7% TO 30%, THE COMMON ACCESSORY ELEMENTS SI, N, P AND S AND FURTHER TI IN SUCH CONTENT THAT THE ACTIVE TI-CONTENT IS AT LEAST THE ONE DEFINED BY A CURVE IN A COORDINATE SYSTEM SET FORTH IN FIG. 1 OF THE DRAWINGS, SAID CURVE PASSING THROUGH THE POINTS 20% FE+CO AND 0.25% TI; 30% FE+CO AND 0.35% TI; 40 FE+CO AND 0.5% TI; 50% FE+CO AND 0.7% TI; 60% FE+CO AND 0.9% TI; 70% FE+CO AND 1.25% TI; 75% FE+CO AND 1.5% TI, THE UPPER LIMIT FOR THE ACTIVE TITANIUM CONTENT BEING BELOW 2% WHEN THE SILICON CONTENT IS ABOVE 0.6% AND BEING DEFINED BY A CURVE IN A TI;-SI COORDINATE SYSTEM SET FORTH IN FIG. 5 OF THE DRAWINGS, SAID CURVE PASSING THROUGH THE POINTS 0.6% SI AND 2.0% TI; 0.3% SI AND 2.3% TI; 0. 1% SI AND 2.6% TI WHEN THE SILCON CONTENT IS BELOW 0.6%