Study of Microstructure and Mechanical Properties of Boron-Containing Hot-Rolled Steel Reinforcement
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STUDY OF MICROSTRUCTURE AND MECHANICAL PROPERTIES OF BORON-CONTAINING HOT-ROLLED STEEL REINFORCEMENT N. A. Shaburova,1 O. V. Samoilova,2 and V. O. Pechnikov3
UDC 669.15-194.52+669.018.291+539.24+539.3
Stiffened specifications for quality of reinforcement product are dictated by the contemporary market that is expressed in the introduction of new TU and GOST for manufactured products. When switching to the new GOST 34028–2016 enterprises are forced to abandon the use of traditional steel grades and switch to sparingly alloyed steel with expensive alloying elements (such as vanadium, niobium, molybdenum) with a lower carbon content. However, transition to new steel grades does not always provide the required level of properties and is often associated with an increase in production costs. Results are provided for a study of the structure and properties of A400C-class steel reinforcement made from a test melt in PAO Chelyabinsk Metallurgical Combine. During steel melting it was aimed at minimizing the number of expensive alloying elements and their partial replacement with boron. Results of the study show that microalloying steel with boron and using the standard manufacturing technology for hotrolled steel does not give unfavorable results for finished product properties and structure. Keywords: boron-containing steel, hot rolled steel, reinforcement, microstructure, mechanical properties, effect of boron on steel properties.
Currently manufacture of building reinforcing steel is developed in the direction of improving metal quality, improvement of rolling and heat treatment technology, and rationalization of profile structure. In this case the contemporary production process is aimed at energy and resource saving technology, and also a reduction in cost of the product with conformity of its properties required by the technical regulations (GOST or TU). The set of specifications laid down reinforcement properties is determined by steel chemical composition and the heat treatment conducted [1–3]. In order to improve the structure and increase mechanical properties structural (including reinforcement) steels are microalloyed with vanadium, niobium, and molybdenum [1–9]. In this case it is well known that boron has a favorable effect on structural steel properties and facilitates grain refinement, improvement of hardenability, and also increases heat resistance as a result strengthening grain boundaries with borides [10–18]. The cost of vanadium, niobium, and molybdenum exceeds by several factors the cost of boron, and therefore with conformity of the properties of the reinforcement obtained partial replacement of expensive element by boron may lead to cheapening of the finished product. The Aim of the Work is to study the microstructure and mechanical properties of boron-containing reinforcement steels and to establish the expediency of partial replacement of vanadium, niobium, and molybdenum by boron. 1 2 3
South Ural State University (Scientific Research University), Chelyabinsk, Russia; e-mail: [email protected]
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