Knife steel is the highest among the three?

Damascus, forged from stainless steel 440, D2 tool steel. Which is harder?

Strength is 440, but Retension board, it would be D2, is 440 flexible so that it is unlikely to break, but slightly dull, while d2 hard, it much better for the preservation Edge, but it is fragile and easily broken, then 440th

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