In recent years, high strength and good weldability of steels have been required for building structures. Hyundai Steel Company has developed a series of construction steels ranging from 550 to 800 MPa tensile strength class, with 450 to 650 MPa yield strength. A microstructure of low-C bainite was obtained by using thermomechanical controlled rolling with accelerated cooling. These steels achieved the required mechanical properties (high strength, low yield/UTS ratio) and demonstrated satisfactory weldability up to 100 mm thickness. In 2012, these steels were successfully used in the construction of the “Federation of Korean Industries” building. (AU) Copyright © 2015 Companhia Brasileira de Metalurgia e Mineração (CBMM) All rights reserved.
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