For example, after the cylinder is cold-rolled, heat treatment is required to restore its properties, and test plates are needed; where should samples be taken from these test plates? Is it in...
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Excessive deformation and severe cold working hardening lead to an increase in the material’s yield strength and a decrease in the yield strength ratio; at the same time, the elongation and reduction of area after fracture decrease. According to standards, heat treatment is required to restore the mechanical properties – normalizing treatment is needed for normalized plates, while recrystallization annealing is necessary for hot-rolled plates. Additionally, test pieces from the products are used to verify the effectiveness of the heat treatment. For example, after cold rolling of cylinders, heat treatment is required to restore their properties, and test pieces are needed again; where should these test pieces be sampled from? Is sampling taken from the body of the cylinder itself? If test plates are used, they haven’t undergone cold rolling, so their properties will definitely differ from those of the cylinder.
This issue is the same as cold forming of end caps; I consulted experts from the Standards Committee, but their answers didn’t address my question – there was nothing I could do. Using a steel plate as a test specimen worked.