TOOL STEEL FOR THE UNITED STATES NAVY. 365 



1. Method of manufacture and physical requirements. — The tool steel 

 shall be made in either the electric or crucible furnace. The bars must be 

 forged or rolled accurately to the dimensions specified, be free from seams, 

 checks, and other physical defects and be of homogeneous composition. 

 The tungsten steels will be deUvered unannealed unless otherwise specified, 

 and the carbon steels will be delivered annealed unless otherwise specified. 

 The bars will be delivered in commercial lengths and short pieces will not 

 be accepted unless so specified. 



2. Stamps on material. — The contractor shall stamp on each bar or 

 piece of steel his name, his trade name of the steel which he is furnishing, 

 and the kind of steel and class as given in these specifications. If the bars 

 are longer than about 3 feet the above stamps will be placed at intervals of 

 about 3 feet along the bar. 



3. Delivery of material. — ^All material will be delivered to the General 

 Storekeeper, Building No. 4, Navy Yard, Philadelphia, Pa. Lots of material 

 less than 1,000 pounds will be delivered in one shipment, and in general all 

 material will be delivered in one shipment if practicable. 



4. Acceptance test. — Samples for acceptance test will be taken from 

 the material delivered to the General Storekeeper, Navy Yard, Philadelphia, 

 Pa., or if the material is inspected at the place of manufacture, the inspector 

 of engineering material will forward samples as called for under the heading 

 "samples furnished by bidder" to the General Storekeeper, Navy Yard, 

 Philadelphia, Pa., who will forward them to the engineer ofiicer. The 

 engineer officer will arrange for the tests, both chemical and physical, 

 required by these specifications and recommend the acceptance or rejection 

 of the material. 



5. Rejection. — If the material is not equivalent to the sample furnished 

 with bid it wiU be considered sufficient cause for rejection. The contractor 

 shall replace the shipment within two weeks, if practicable, after the receipt 

 of notice of rejection. 



PHYSICAL TESTS. 



Tungsten Steel. 



6. Class I. — ^The sample bar wiU be forged into 5 tools, treated and 

 ground to the No. 30 form of the Sellers system of tool forms. Bach tool 

 will be tested on nickel-steel forging of about 100,000 pounds tensile strength, 

 with a cut f inch deep, 1^ inch feed, and a cutting speed of 50 feet per min- 

 ute. The tool will be twice reground and retested. A record will be made 

 of the length of time the tool cuts without a lubricant or cutting compound 

 before it is ruined. 



