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F9 and F91 steel for low temp

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Johnwoo1991

Materials
Joined
Nov 21, 2023
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17
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IT
Is it true that high alloyed F9 and F91 grades become easily brittle at 0°C or even at ambient temperature?

Is it the same even for low alloy F11 and F22 steels?
 
There is a ton of data out there on this.
P9 and 91 will have lower ductility at low temperatures than less alloyed steels.
How low depends on how they were heat treated.
 
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