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  • Users: h82fail
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  1. h82fail

    4340 Heat Treating

    I am heat treating 4340 attemting to achieve the following results (similar to ASTM A540-B23): Tensile 145,000 psi Yield 130,000 psi Elongation in 2" of 12% Reduction in area of 40% Impact V-notch ft-lbs 25 Brinnell 302-375 I used the following process: Heated to 1575 F for 3.5 hrs in a...

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