We present the results of metallographic investigations of the structure and microhardness and the results of the bench tests of the threads of tubings made of steels of the strength class D after finishing electromechanical surface quenching in pairs with commercial couplings.
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Fedorova, L.V., Fedorov, S.K., Slavin, A.V. et al. Structure and Microhardness of the Tubing Thread After Finishing Electromechanical Surface Quenching. Met Sci Heat Treat 62, 161–167 (2020). https://doi.org/10.1007/s11041-020-00552-x