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  • Users: sphelps
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  1. sphelps

    Heat Treating Issues with 4140 (Scaling)

    Hi all, we've recently switched to 4140A from 4340A for some of the parts we manufacture. The 4140 is simply easier to come by and significantly cheaper in our location. For the 4140 we soak the parts for 30min once the oven returns to it's set temperature of 1580F. The parts are 1" square...

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