Formation of structure and properties of heat-strengthened reinforcing bar in the flow of jobbing mill
DOI:
https://doi.org/10.15587/1729-4061.2013.9294Keywords:
structure, heat-strengthened reinforcing bar, broken hardening.Abstract
The article presents the results of our studies in heat strengthening. Although there are many works, investigating heat strengthening of a reinforcing bar, modern literature could not provide sufficient information on formation of the structure and properties of reinforcement by broken hardening. To obtain the reinforcement with necessary distribution of the microstructure on the cross section, we have developed two modes of heat strengthening, varying by water pressure, supplied to the first section (mode 1 - 0.8 MPa, mode 2 - 1.5 MPa). The water pressure in the second and third sections, and the speed of rolling at two modes were similar and were equal to 0.6 MPa and 11.8 m/s respectively. The microstructures analysis showed that after the first mode of heat strengthening the structure consisted of colonies of quasieutectoid and rod cementite. After the second mode the structure consisted of bainite over the entire section.The above results, obtained from experiments in the flow of jobbing mill 250-1 produced by public company «AMKR», confirmed the possibility of obtaining new data on the features of the phase transformations of austenite and the formation of such structure on the cross section of the reinforcement, which was little known. The use of broken hardening showed that such mechanical properties as strength and flexibility met the requirements of international standards. This improves handling of the process of the formation of structure and properties of bar, as well as adds to it additional consumer properties.
References
- Высокопрочные арматурные стали. [Текст] / А.П. Гуляев, А.С. Астафьев, М.А. Волкова и др. – М.: Металлургия, 1966. - 138 с.
- Термическое упрочнение проката. [Текст] / К.Ф. Стародубов, И.Г. Узлов, В.Я. Савенков и др. – М.: Металлургия, 1970. - 368 с.
- Савенков В.Я. Технологические основы и оборудование для термического упрочнения непрерывнодвижущегося мелкосортного профиля [Текст] / В.Я. Савенков // Упрочняющая термическая и термомеханическая обработка проката. - Вып. 1, Киев. - 1968. - С.7-14.
- Стародубов К.Ф., Савенков В.Я., Спиваков В.И. Влияние скорости охлаждения на свойства термически упрочненной арматурной стали [Текст] / К.Ф. Стародубов, В.Я. Савенков, В.И. Спиваков // Термическая обработка проката. - Вып. 36. - М.: Металлургия. – 1970. - С. 9-14.
- Гуль Ю.П., Гулевский А.С., Ярмоленко А.П. Влияние способа термического упрочнения на низкотемпературную прочность стержневой арматурной стали [Текст] / Ю.П. Гуль, А.С. Гулевский, А.П. Ярмоленко // Металлургическая и горнорудная промышленность. – 1973. – Вып. 5. - С. 31-32.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2014 Дмитро Юрійович Клюєв, Сергій Борисович Комлєв, Сергій Олегович Мацишин
This work is licensed under a Creative Commons Attribution 4.0 International License.
The consolidation and conditions for the transfer of copyright (identification of authorship) is carried out in the License Agreement. In particular, the authors reserve the right to the authorship of their manuscript and transfer the first publication of this work to the journal under the terms of the Creative Commons CC BY license. At the same time, they have the right to conclude on their own additional agreements concerning the non-exclusive distribution of the work in the form in which it was published by this journal, but provided that the link to the first publication of the article in this journal is preserved.
A license agreement is a document in which the author warrants that he/she owns all copyright for the work (manuscript, article, etc.).
The authors, signing the License Agreement with TECHNOLOGY CENTER PC, have all rights to the further use of their work, provided that they link to our edition in which the work was published.
According to the terms of the License Agreement, the Publisher TECHNOLOGY CENTER PC does not take away your copyrights and receives permission from the authors to use and dissemination of the publication through the world's scientific resources (own electronic resources, scientometric databases, repositories, libraries, etc.).
In the absence of a signed License Agreement or in the absence of this agreement of identifiers allowing to identify the identity of the author, the editors have no right to work with the manuscript.
It is important to remember that there is another type of agreement between authors and publishers – when copyright is transferred from the authors to the publisher. In this case, the authors lose ownership of their work and may not use it in any way.
