Influence on Reduction Scheme Hardness Cold Rolled Strip Mark Steel ST 12
Abstract
The paper presents the results of the research on the influence of the evolution hardness scheme rolled steel, for the cold-rolled strip steel St 12. St 12 is intended for the manufacture of cold rolled strip stamping properties environments.
We studied three variants of rolling with the same degree of deformation. The total = 60% of the samples submitted to the research were divided into 3 groups. Samples from the first group were rolled with uniform reduction coefficient increased from the first to the last pass. Samples from the second group were rolled with constant coefficients decreased from the first to the last pass. Samples of the third group were rolled with uniform reduction coefficient decreased from the first to the last pass.
By statistical processing of the experimental data was done correlation HRB = f (ε) using an equation like: HRB = HRB0 + a × εb from which the mathematical calculations specific led to obtain equations curves hardening for the three kinds of rolling schemes.
Following research consisting in observing as steel hardening analyzed has a very high speed we can say that the limit of plasticity of the material cold rolling is more than 60% where cracks are observed.
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