Removing screws that secure a barrel to an action...

The Kurgan

The Kurgan

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Unfortunately, the screws are secured with red loctite.

Would a small propane torch affect the barrel's integrity / heat treatment?

BTW, the action is aluminum.

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Because the locking abutments are in the barrel, you would not want to heat that area past the critical point.
The heat to break Loctite is well below that.
 
Looks like the recalled cz600 was your returned and “fixed” by the recall. If you like you can read about cracked ps94 sako or sauer 202 alloy receiver that have cracked. Was the actual issue disclosed by cz?

I can’t see propane hurting it, anyway to use an induction heater?
 
Thanks all. Yes, it's a CZ 600. Post-recall.

It's a great design and easy to clean and maintain.
The red loctite is a mild annoyance.
 
If you heat up just the screws it will brake down the loctite, but your screws will still be tight in the holes. If you heat up the action it'll brake down the loctite but the screws will loosen in the holes because aluminum expands much more than steel. Heat the area around the screws just enough that its too hot to grab with your bare hand.
 
"too hot to grab with bare hand" is less than 200 F for most people. I do not know anyone who would stick their hand into boiling water - 212 F / 100 C. Much above that is when spit or sweat on your finger tip will "sizzle" if you touch hot metal - it appears permanent type loctite needs a LOT more than that temp to soften. Polished shiny steel will go through various yellow and straw colours as it is heated - turns like a brown colour at 500 F. Can look up "tempering" or "draw temper" colour charts on Internet.
 
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Maybe I have leathery mits :p
Aluminum will start to anneal around 500°f, if it's too hot to touch for a split second, that'll be a good margin before you wreck the receiver.
 
As suggested, use a soldering iron to apply heat. Popular 60/40 Solder melts at ~ 361F. If you can find a soldering iron with adjustable temperature, dial it up to 400F and use a wedge tip. This will be low risk on overheating the aluminum. I try to remove scope base screws off my Benelli R1 last week and it won't budge. I apply heat to the screws with my Weller soldering iron with a wedge tip and got all 4 screws off with no issues.
 
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