Repro frame alloy?

[Chuck Heald]

Dave,
I was hoping Richard Skeuse would know for sure. I know the custom rifle guys like the 8620 because it has a high enough carbon content to core harden to a perfect hardness when it is casehardened. This leaves a super hard case and a strong core, like 2 - 2 1/2 times the tensile strength of low carbon steel if I recall.

But the Repro looks like it was never case hardened. So, I was suspicious it was a 4xxx steel that was martensitically (thru) hardened.

[Grantham Forester]

A friend has a Parker 20 gauge Repro- sweet handling gun, but after two seasons in the grouse coverts, the case coloring is almost worn off the receiver. Were these later production Parkers case colored in a different manner than those made in Meridian Conn.??

[edgarspencer]

Originally Posted by Chuck Heald

like 2 - 2 1/2 times the tensile strength of low carbon steel if I recall.

not 2-2 1/2 times.
Plain carbon steel (1010) will have a tensile strength, when normalized and tempered, in the 65-70K range, yield in the 35-40K range. Typical 1018 (Approximates WCB will be 70-36.
8620 (.20C, Ni Cr Mo) will be in the 90K tensile, 60K yield range. 8635 (.35C) will be minimum 105K Tensile, 85K yield.