Структура та властивості термозміцненого арматурно- го прокату зі сталі Ст3Гпс

The article presents the results of our studies in the field of heat-strengthening. To obtain the reinforcement with the necessary microstructure along the cross-section we have developed three modes of heat-strengthening of the steel Ст3Гпс, which varied by pressure of water, fed into sections. The microstructure analysis showed that the higher intensity of cooling mode 1 formed a layer with high hardness, ~ 0.5 mm greater than after the modes 2 and 3. However, hardness on the surface of the sample after application of the 1 mode is less than or equal to the hardness of samples 2 and 3, respectively. It was also found that in the composition of volume of the rebar one should distinguish the periaxial volume, which is located 0.67 - 0.70 of length of the radius from the axis of the rod to the surface, and the volume concluded between the periaxial volume and a layer of martensite formed in the period of rapid cooling.The above results, obtained from experiments in the flow of small section mill 250-1 PAO "AMKR", confirmed the possibility of obtaining new data on the temperature changes occurring during the application of the method of interrupted hardening, affecting the stability of austenite. The effect of temperature cyclic changes is distributed in reinforcement at a depth of approximately one-third of the nominal radius of the rodВ статье описано исследование структуры и свойств термоупрочненого арматурного проката из стали Ст3Гпс в потоке беспрерывных прокатных станов с использованием способа прерывистой закалки. Проведен анализ изменения микротвердости по сечению арматурных стержней из стали Ст3Гпс по различным режимам термоупрочненияВ статті описані дослідження структури та властивостей термозміцненого арматурного прокату марки Ст3ТРпс у потоці безперервних прокатних станів з використанням способу переривистого гартування. Проведений аналіз зміни мікротвердості по перетину арматурних стрижнів зі сталі Ст3Гпс по різним режимам термозміцненн