The specific grade of steel that is considered the strongest is grade 400 stainless steel, specifically type 440. 440 stainless steel grade is a cutlery steel with a higher carbon content. When properly heat treated, grade 440 retains edges better than other steels.
As one of the hardest stainless steel grades, it is divided into four subsets. Stainless steel is divided into 440A, 440B, 440C and 440F, which differ only in the carbon content. Of these, 440C stainless steel is considered the strongest, with a carbon content between 0.95-1.20%. During annealing, 440 steel can be easily machined, machined and manipulated into shape to further increase strength.
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