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17-4 forged material

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forging82

forging82

Materials
Dec 9, 2013
16
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US
I was wondering if anyone knows how high 17-4 material can be heated during solution without growing grain size. I know the recommended temp is 1900F but I'm wondering what will happen if the furnace is hotter(~1970F).
Thanks
 
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Do you know what the original forging temperaure was? If it was higher than 1970 F, then grain growth should not be an issue.
 
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