TOOL STEEIv EOR THE UNITED STATES NAVY. 35^ 



APPENDIX A * 



SPECIFICATIONS (47 S5) FOR HIGH-SPEED TOOL, STEEL ISSUED BY THE NAVY 



DEPARTMENT, JANUARY 5, I909. 



1. The steel shall be made by the crucible process, and shall be of 

 uniform quality throughout, and shall be delivered in bars of commercial 

 length, no short bars to be received, and shall be delivered annealed unless 

 otherwise specified. The bars shall be free from all seams, cracks, and other 

 mechanical defects. 



2. The steel shall be delivered and inspected in lots of not more than 

 5,000 pounds, unless otherwise specified, each lot containing its proper 

 proportion of the sizes called for on the requisition. 



3. The inspection shall be made at the Navy Yard, League Island, Pa., 

 and shall be under the direction of an officer detailed for that duty by the 

 Commandant of the yard. 



4. Each bar, up to and including a sectional area of 2j square inches, 

 shall be delivered with a test piece on one end about one and one-half times 

 the larger dimension of the bar in length, nicked one-quarter through from 

 each side while bar was hot, so that the test piece may be easily broken off. 

 Larger bars to have coupon test piece forged on one end and nicked as stated 

 above. The test piece must be stamped to match the number of the bar, 

 and when forged down as a coupon must be about i inch by i| inches and 

 about 3 inches long. 



5. The test piece from each bar will be broken off and subjected to a 

 high-heat test in an approved furnace, kept at a definite uniform tempera- 

 ture, which shall be as high as practicable. The test piece, when broken 

 off the end of the bar, should show the fine grain which is characteristic of 

 this class of high-speed tool steel when properly made. 



HIGH-HEAT TEST. 



6. The test piece shall be preheated slowly and thoroughly in a pre- 

 heating furnace kept at a uniform temperature of about 1,550° F. When 

 thoroughly heated the test piece shall be quickly transferred to the high- 

 heat furnace and rapidly heated to just below the melting point, then 

 promptly removed from the furnace and blown cold in a heavy blast of air. 



*The Appendices A, B, C and D are reproductions of specifications issued by the Navy Department. 



