Abstract
In this research, the large-heat-input welding conditions optimized to use the rear plate and the high-performance steel of SM570TMCP, a new kind of steel suitable for the requirements of prospective customers, are proposed. The goal of this research is to contribute to securing the welding fabrication optimized to use the high-strength steel and rear steel plates in the field of construction industry in the future. This research is judged to contribute to securing the welding fabrication optimized to use the high-strength steel and rear steel plates in the field of construction industry in the future.
Highlights
Since the rigidity and strength required for members increase according to recent trends of the large space and high rise such as diagrid [1,2,3,4] of architectural structures and the large span of steel bridges, steel materials gradually tend to aim at high strength, extremely thick plate, and high performance, and its application is introduced by Schroeter and Lehnert [5]
According to the questionnaire survey conducted by Korea Research on the basis of a contract with POSCO and Research Institute of Industrial Science and Technology (RIST) regarding the demand analysis of high-performance steel types [6] targeting over 500 experts from academia, structural designers, and construction companies, most of the experts preferred, as performance standards of highperformance steel kinds, (i) a high design standard strength; (ii) no reduction in the design standard strength in the over 40 mm thickness; and (iii) excellent weldability
In response to such requirements, POSCO has developed PILAC-BT45 steel in 2004, which is denoted as SM570TMC, a 600 MPa-class new steel material, for application to architectural structures, whose weldability is improved by reducing the carbon equivalent a great deal, while raising the design standard strength of steel materials, with the thermomechanically controlled (TMC) process
Summary
Since the rigidity and strength required for members increase according to recent trends of the large space and high rise such as diagrid [1,2,3,4] of architectural structures and the large span of steel bridges, steel materials gradually tend to aim at high strength, extremely thick plate, and high performance, and its application is introduced by Schroeter and Lehnert [5]. According to the questionnaire survey conducted by Korea Research on the basis of a contract with POSCO and Research Institute of Industrial Science and Technology (RIST) regarding the demand analysis of high-performance steel types [6] targeting over 500 experts from academia, structural designers, and construction companies, most of the experts preferred, as performance standards of highperformance steel kinds, (i) a high design standard strength; (ii) no reduction in the design standard strength in the over 40 mm thickness; and (iii) excellent weldability Out of these preferences, the first and second preferences are fundamental requirements which may cause troubles in securing the expected performance of steel kinds, while the third one may be regarded as a secondary requirement which can be preferentially improved on the basis of the weldability data of existing general steels. Lee et al [8] provided characteristics of high temperature tensile properties and residual stresses in welded joints
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