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Old May 18, 2017, 01:47 PM   #22
HiBC
Senior Member
 
Join Date: November 13, 2006
Posts: 5,944
GP,no argument. 4140 has more carbon and can achieve higher hardness.It also has more tensile strength.

8620 has some nickel in it. It is regarded as a "case hardening" steel.
Here is some data

http://www.interlloy.com.au/our-prod...rdening-steel/
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