My company uses ASTM a325 medium carbon bolts in the manufacturing of our components. Recently, a customer has been complaining of these bolts breaking on his part. I believe it is because of the high temperatures these bolts are being exposed to. These bolts are 1" in diameter and are possibly being heated to between 800 and 1200 degrees. Is there some way to corelate the ultimate strength of the bolt to the temperature it is being exposed to? I'm thinking there should be a chart somewhere, but I have yet to find it. Thanks in advance for any help.
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