  Molybdenum nut. 
Purchased from Neil Lipson through eBay.  This bolt was said to have been from a high-temperature pressure vessel of some sort.   
 
Analysis by x-ray fluorescence spectroscopy at the Center for Microanalysis of Materials, University of Illinois (partially supported by the U.S. Department of Energy under grant DEFG02-91-ER45439) indicates that this bolt is approximately 92% molybdenum with the remainder a mixture of cobalt and chromium. 
Source: Neil Lipson 
Contributor: Theodore Gray 
Acquired: 25 April, 2009 
Text Updated: 25 April, 2009 
Price: $13 
Size: 0.4" 
Purity: 92%
 |  
  |  
 |  
  |