Dislocation A linear defect in the structure of a crystal. A hardened and tempered spring steel strip, usually blued, produced from approximately .85 carbon cold rolled spring steel strip specially selected for straightness and good edges. Sometimes hand straightened or straightened by grinding and cur to desired lengths. Drawing Back Reheating after hardening to a temperature below the critical for the purpose of changing the hardness of the steel. Drill Rod A term given to an annealed and polished high carbon tool steel rod usually round and centerless ground.
Commercial qualities embrace water and oil hardening grades.
A less popular but nevertheless standard grade is a non-deforming quality. Drill Rods are used principally by machinists and tool and die makers for punches, drills, taps, dowel pins, screw machine parts, small tools, etc. Drop Forging A forging made with a drop hammer. Drop Hammer A forging hammer than depends on gravity for its force. Dry Rolled Finish Finish obtained by cold rolling on polished rolls without the use of any coolant or metal lubricant, of material previously plain pickled, giving a burnished appearance.