The Accurate Reloading Forums
8620
31 January 2010, 18:16
richj8620
I've seen a few short run action using this steel. So, what's the deal, it doesn't rust blue as easily at some.
added nickle but less carbon and chromium than 4041. does that make it much easier to machine?
or is it size availability?
Rich
31 January 2010, 20:55
Duane WiebeWidely used...this is the steel of choice for Granite Mountain Arms Actions
31 January 2010, 21:06
JBrownI believe it is easier to color case FWIW.
Jason
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31 January 2010, 23:41
kcstottTypically 8620 is a case hardened steel. If it is properly heat treated it will blue nicely but may not rust blue. It will take a color case though.
It can be trough hardened but in most cases it is case hardened.
it is also a very strong steel and if the case is the correct depth it will be one hell of an action
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01 February 2010, 00:38
Duane WiebeI've rust blued several..just takes a few more coats...maybe because of the nickel?
02 February 2010, 06:25
jeffeossoeasy to machine, easy to harden, doesn't warp BADLY, can be colorcased, surfaced hardened, and still remain elastic internally .. an amazing metal
02 February 2010, 16:57
Tapper2John Deere uses a lot of it because it is cheaper to case harden 8620 than to buy chrome-vanadium steels, like 4140 and 4340 and thru harden. In many applications strength isn't as important as wear resistance. Case hardened 8620 shines in that area. I was an engineer there for 23 years....Tom
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02 February 2010, 18:45
richjthank you all. very interesting stuff.
Rich
02 February 2010, 19:10
kcstott8620 is also the steel used in just about every rear axle's differential gearing and axle shafts.
The ring, pinion, spider gears, and axles are 8620 from the factory.
After market stuff is usually CM
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08 February 2010, 09:30
buckbrush8620 was used for the M-14, Not the M-1.
15 February 2010, 22:20
dpcdPlease see "Hatcher's Notebook" (1947), Page 230; "Material: After July 1942, WD No. 8620 Modified, same as for the bolt." Of course, he could be wrong... I did not check the TDP.