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Quoted: I wonder how it would do in a Rockwell hardness test. |
I vote for somewhere around dead soft and peanut butter. |
I'm not a metallurgist, but wouldn't the fire harden it more? |
I'm not a metallurgist either but the conditions of a house fire are the manner in which metal is annealed. |
It all depends...
#1 Did it get hot enough to temper it to a lower hardness? Depending on it's original temper this could take as little as 300-400 degrees F to as much as 1000 degrees F.
#2 Did it get hot enough to anneal or harden it? This requires about 1300-1400 degrees F. For annealing the rate of cooling has to be very slow, in the ballpark of 40 degrees lost per hour. This would happen if it got buried in ash and was recovered a few days later. If it got a direct blast of cold water from the hose, enough to cool it from 1400 F to below 200 degrees F very quickly, it could be brittle as glass (i.e. very hard).
I voted for soft since the rapid quench isn't as likely to happen unless the hose is trained on it directly for a minute or so. The rapid quench would also likely not be uniform and therefor warp the gun slightly.
Either way, we all know you don't want to trust your fingers and eyes to a gun that has been in a fire.