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Author Topic: Opinion on barrel material  (Read 389 times)

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Offline superscifi12

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Opinion on barrel material
« on: December 25, 2011, 12:12:20 PM »
I am a machinist and we have a piece of 8620 tube that has and OD of 4.000 and and ID of 1.500 by 4'. I know that N-SSA requires 3 times the bore diameter at the breach. besides sleaving the barrel is there any other option to get this in spec? Make a reduced powder chamber part of the breach plug?
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Offline Cat Whisperer

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Re: Opinion on barrel material
« Reply #1 on: December 25, 2011, 12:41:18 PM »
8620 is some remarkable steel.  (It is what is specified for M-16 bolts.)

Barrel material?   Hmmmm.  It has great strength and resistance to impact.  (Will vary a bit depending on hardening.)

Not typically used for barrels.  Might be because of cost/availability.

OK, lets look at the various strengths and tests to determine suitability.

Comparisons could easily be made to known good barrel making steels, 1018 (low carbon steel) and 4130/4140 (typical alloy used in making rifle barrels).


superscifi12  -  WELCOME to the board!!!
What cannons are you wanting to make?
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Tim K                 www.GBOCANNONS.COM
Cat Whisperer
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Offline superscifi12

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Re: Opinion on barrel material
« Reply #2 on: December 25, 2011, 01:12:34 PM »
Not sure exactly what cannon but I was thinking something in the Revolutionary War period. And as for the 8620 it has been sitting in our material rack for 11yrs along with a 4.500 OD by 6' 8620 Bar both were ordered for a special project that didn't use it all.
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