material kind's property, of course martensitic steels, is a super-hard alloy, honed through heat and tempering, used in razors, surgical tool, ball bearing, s

material kind's property, of course martensitic steels, is a super-hard alloy, honed through heat and tempering, used in razors, surgical tool, ball bearing, some disc brake Hardened steel-carbide alloy, this's less brittle, etc. https://www.wired.com/story/why-do-razor-blades-dull-so-quickly/ https://www.wired.com/story/why-do-razor-blades-dull-so-quic...