US2005201886A1PendingUtilityA1

Nanocrystalline bolt and method for manufacturing same

47
Priority: Feb 20, 2004Filed: Feb 2, 2005Published: Sep 15, 2005
Est. expiryFeb 20, 2024(expired)· nominal 20-yr term from priority
Inventors:Yuichi Murakami
C22C 33/0285B22F 3/20B22F 2999/00B22F 2998/10F16B 35/00B22F 5/06G10L 21/0272G10L 21/028G10L 25/90
47
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Claims

Abstract

A nanocrystalline bolt, which serves as a high-strength bolt, is manufactured by the steps of compacting powder formed of nanocrystalline metal particles having a nanometer-scale grain size, extruding a resultant compact so as to obtain a rod stock, and subjecting the rod stock to a bolt-forming process (heading, machining, and form rolling) without involvement of heat treatment. Examples of metal material include JIS SUS410, precipitation-hardening-type 13Cr-8Ni-2Mo, and other stainless steels.

Claims

exact text as granted — not AI-modified
1 . A nanocrystalline bolt manufactured by compacting powder formed of nanocrystalline metal particles having a nanometer-scale grain size, extruding a resultant compact so as to obtain a rod stock, and forming the rod stock into a bolt shape without involvement of heat treatment.  
   
   
       2 . A nanocrystalline bolt according to  claim 1 , wherein the metal powder is of stainless steel.  
   
   
       3 . A method for manufacturing a nanocrystalline bolt, comprising the steps of: 
 compacting powder formed of nanocrystalline metal particles having a nanometer-scale grain size;    extruding a resultant compact so as to obtain a rod stock; and    forming the rod stock into a bolt shape without involvement of heat treatment.    
   
   
       4 . A method for manufacturing a nanocrystalline bolt according to  claim 3 , wherein the metal powder is of stainless steel.

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