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Colt Peacemaker, showing discoloration from case-hardening
Colt Peacemaker, showing discoloration from case-hardening
A flame-hardened sprocket. The discoloration around the teeth delineates the area that was rapidly heated and then quenched.
A flame-hardened sprocket. The discoloration around the teeth delineates the area that was rapidly heated and then quenched.
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A modern computerised gas carburising furnace
A modern computerised gas carburising furnace