372 TOOL STEEL FOR THE UNITED STATES NAVY. 



after the receipt of notice of rejection. The sample bars used for this test 

 will be credited the contractor if the material under test is accepted. 



15. Defective material. — If material, when being manufactured into 

 tools, develops physical defects which could not be detected by inspection, 

 such as "cracks," "pipes," etc., the manufacturer of this steel shall replace, 

 without cost to the government, such defective material. 



Proposals. 



16. Reservation and alternate proposals. — The right is reserved to 

 reject any or all proposals. 



Bidders may submit proposals on tool steel which differs from the com- 

 position and method of manufacture specified, provided this is clearly stated 

 in their proposal, and provided they furnish the engineer officer with a 

 statement of the exact chemical composition and method of manufacture 

 of the tool steel. This information will be considered confidential by the 

 engineer officer if the bidder requests it. The tool steel will be tested if, 

 in the opinion of the engineer officer, it is considered suitable for the purpose 

 intended. 



17. The engineer officer will, after the prescribed tests have been made, 

 recommend the award of contract for the steel or steels which, in his opinion, 

 it is to the best interest of the government to purchase, due consideration 

 being given to the cost of the material. The relation of the tests and the 

 price of the material will be the basis for selection. 



18. Selective test. — Each bidder shall furnish with his proposal a sample 

 bar of tool steel stamped as called for under heading "Stamps on material" 

 for the "selective test." The relation of the results obtained from the tests 

 conducted as provided for under the heading "Physical tests" and the price 

 of the material determine the selective factor. The dimensions of the 

 sample bars shall be as follows : — 



Tungsten tool steel — 



Class I. — I by 1 1 inches by 5 feet long. 

 Carbon tool steel — 



Class I . — f -inch diameter rod, 2 feet long. 



Class 2. — f-inch diameter rod, 2 feet long. 



Class 3. — |-inch octagon rod, 5 feet long. 



Class 4. — 2-inch diameter rod, 2 feet long. 



19. Treatment of samples. — Each bidder will state in his proposal, if 

 he considers it necessary to do so, the treatment to which the material must 

 be subjected in order to get, in his opinion, the best results. 



