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HiBC · May 18, 2017, 01:47 PM

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/

May 18, 2017, 01:47 PM	#22
HiBC Senior Member Join Date: November 13, 2006 Posts: 8,283	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/