Improvement of quality for rolled steels and allowing to eliminate of chemical homogeneity Mn-alloy steels by means of new modes heat treatments.

The tensile properties of normalized rolled low alloy E36 steel after heat-treatment regime which includes isothermal holding at the subcritical temperatures and subsequent normalization were investigated. In the paper is given a solution of actual scientific and technical task, that is the improvement of operational performance, elimination of the anisotropy of the mechanical and physico-chemical properties by optimizing the chemical composition and a homogeneous spatial distribution in the microstructure of the main alloying elements. Using the methods of the deep data analysis researching, investigated the effect of production parameters (chemical composition and thickness of rolled metal) on the key indicators of the mechanical properties: ultimate strength, yield strength, percent elongation and impact resistance.Examined herein the influence of thermal treatment on the chemical distribution of elements, microstructure, hardness and mechanical properties of the welded manganese steels. It is established that in the process of isothermal soaking in a two-phase region there are intensive processes of grain-boundary diffusion, which lead to redistribution of the alloying elements. It is shown the increase of hardness and high plasticity conservation in the result of the preliminary heat-treatment. The obtained results are in accordance with the metallographic data about fine sized grain boundary pearlite areas formation during the isothermal holding.