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1/25/2018 7:38:29 AM
Posted: 12/14/2005 1:32:30 PM EST
First test fire the ejector rail is starting to mushroom out a bit where it kicks the case out. Aprox. 50 rounds. When I heat treated I took the rail to red hot then quenched. next I brought to blue/gray color then let it air cool. Can I try to re heat treat? Anyone know what the problem is?
Link Posted: 12/15/2005 10:30:56 AM EST
ANY IDEAS???????????
Link Posted: 12/15/2005 10:58:23 AM EST
Try heating to white then quench it in a gallon of motor oil. That should do it.
Link Posted: 12/15/2005 2:26:16 PM EST

Originally Posted By RodMI:
Try heating to white then quench it in a gallon of motor oil. That should do it.

Why would motor oil be better than Water?
Link Posted: 12/15/2005 7:32:17 PM EST
What kind of steel is it?
Link Posted: 12/16/2005 12:33:09 AM EST
Link Posted: 12/16/2005 12:35:24 AM EST
White? Would that be the color after red or before? Thanks
Link Posted: 12/16/2005 1:35:14 AM EST
Blacksmiths kept their shops semi dark so they could see the color changes better. I have been tempering at orange, just after cherry red. Oil with some metals gives a better hardness as water can make it a little too brittle .
Link Posted: 12/16/2005 1:53:28 AM EST
Heard of some using Kasenite or I think welding the tip of ejector?
Link Posted: 12/17/2005 3:36:41 AM EST
Hey 1917, not to worry. First off, the 4130 cannot harden to brittelness like 4140. It has a lower alloy content. You should not anneal it at all. Remember you only have to harden the very tip of the ejector, not the whole thing. You cannot quench 4130 in oil. It cools it too slowly and the steel will mush, 4130 requires a violent water quench. You can heat treat it many times to get the right hardness, but the steel will start to oxidise after awhile and that's not good. This is not "speculation" advise, this is straight from the shop floor, from experiance on working guns. If all else fails, you can tig weld on some hard surfaceing rod used for plow blades and that can fix a messed up ejector as a last resort.
Link Posted: 12/19/2005 4:41:26 PM EST
Thanks, I will give it a try.
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