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  1. jawdayub1

    increasing tensile strengthn of 4140 steel shaft 7ft

    Hello, I'm looking to build olympic barbell, i have purchased 4140 grade in annealed form which typical hardness is around 20HRC. I have done knurling on the shaft but i need to increase the tensile strength. the typical tempering and hardness seems to be very expensive to meet the tensile...

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