The article analyses the results of chemical composition control and comparative mechanical tensile tests (to determine the tensile strength Rm, yield strength Rp0.2, elongation A), microstructural analysis, microhardness and surface roughness of steel strips of high-strength low-carbon, low-alloyed steels, widely used in the automotive, engineering and construction industries in order to determine the causes of the frequent failure of a series of manufactured plates.
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