From: muratlanne@gmail.com   
      
   https://en.wikipedia.org/wiki/Eglin_steel   
   Yield is around 200,000 PSI, exceeding a Grade 8 bolt at 150,000 PSI. It   
   accomplishes its strength with only 5% Nickel and lower amounts of other   
   valuable metals, so the ingredients are cheaper than stainless and   
   processing doesn't require a vacuum furnace except to achieve the highest   
   properties.   
      
   The compressive strength of granite is given as up to 45,000 PSI. Single   
   point carbide tipped chisels are recommended to carve it, carbon steel   
   chisels for other types of stone dull in seconds on it. The rock drill rod I   
   turned the jack adapter from is a broken and discarded end with the 3" drill   
   bit still on. 1/2" carbide buttons worn hemispherical do the   
   cutting/pulverizing, with compressed air removing the dust.   
      
   "Eglin steel can be welded easily" but machinability isn't mentioned. HSS   
   cuts Grade 8.   
      
   --- SoupGate-Win32 v1.05   
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