TOOL STEEI. FOR THE UNITED STATES NAVY. 



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APPENDIX D. 



Specifications for Schedule 4469. 



purpose; for which the steel is intended. 



Tungsten Tool Steel. 



1. Class I. — Lathe and planer tools, milling-machine tools, and in 

 general all tools for which high-speed steel is used. 



Carbon Tool Steel. 



2. Class I. — Lathe and planer tools, and tolls requiring keen cutting 

 edge combined with great hardness, for finishing shrinkage dimensions on 

 nickel-steel gun forgings, drills, taps, reamers, and screw-cutting dies. 



3. Class 2. — Milling cutters, mandrels, trimmer dies, threading dies, 

 and general machine-shop tools requiring a keen cutting edge combined 

 with hardness. 



4. Class 3. — Pneumatic chisels, punches, shear blades, etc., and in 

 general tools requiring hard surface with considerable tenacity. 



5. Class 4. — Rivet sets, hammers, cupping tools, smith tools, hot drop 

 forge dies, etc., and in general tools which require great toughness combined 

 with the necessary hardness. 



Chemical Composition. 



*Remainder. 



