C67 -- high-carbon steel 0.65-0.72% C. Rm 800-1000 MPa normalized. For knife blanks, springs and tools where hardness is needed but full alloy steel cost is avoided.
C67 per EN 10083-2 (1.0603). Carbon 0.65-0.72%, higher than C60. Used for agricultural blades, saw blades, hand tools and simple springs. Limited hardenability (~12 mm section).
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