We have some low alloy steel components that we gaseous nitrocarburize case harden. The parts grow a little in heat treat and we have to take this into consideration in the machining so they finish up the correct size. I'm currently designing similar parts that are about 40% bigger and trying to decide if I should expect the same amount of growth or if the growth will scale proportionately with size. I'm leaning toward the same amount of growth since it's just a thin hard case and it should be about the same depth. If we were through hardening then the growth would be more nearly proportionate to size. Do I have that right or am I all wet? We will of course do some trials to prove it out either way but I like to get these things right from the start.
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