[TheForge] 4140 vs 4340

Wed Mar 27 21:05:01 2002

4140 is a good choice, but 4340 is the toughest alloy you will find commonly 
available.  The fracture toughness of 4340 is incredible.  Only the new 
superalloys made by Cartech like "Aermet 100" and some of the high cobalt 
grades are a match for 4340, and cost about 10 to 15 times the price.  It 
does have to be heat treated properly to obtain optimum properties.
Michael

Mike Schermerhorn
Art & Metal Co.
Your PURE IRON supplier