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SR-77 is Busse Combat knives modified AISI S7 shock resistant tool steel. D2 is cold work tool and die steel.

Given the ideal heat treatment for both steels, and knife designated use one can be better than the other, depending on that use.

Simply put for the knives optimized for light cutting, D2 will be better choice, it will hold the edge longer, can be made harder too.

For large blades, intended to be used for chopping, heavy duty cutting, prying etc shock steel is a better choice, especially SR-77 which has very good heat treatment from Busse.

Chemical makeup and other details regarding both steels can be found in the related links section.

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