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Journal of KWJS 2007;25(1):57-62.
Published online March 26, 2007.
대입열 EH36-TM강의 Tandem EGW 용접부 미세조직 및 기계적 성질
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Mechanical Properties and Microstructures of High Heat Input Welded Tandem EGW Joint in EH36-TM Steel
Hong-Chul Jeong, Young-Hwan Park, Young-Ho An, Jong-Bong Lee
Abstract
  In the coarse grained HAZ of conventional TiN steel, most TiN particles are dissolved and austenite grain growth easily occurrs during high heat input welding. To avoid this difficulty, thermal stability of TiN particles is improved by increasing nitrogen content in EH36-TM steel. Increased thermal stability of TiN particle is helpful for preventing austenite grain growth by the pinning effect. In this study, the mechanical properties and microstructures of high heat input welded Tandem EGW joint in EH36-TM steel with high nitrogen content were investigated. The austenite grain size in simulated HAZ of the steel at 1400℃ was much smaller than that of conventional TiN steel. Even for high heat input welding, the microstructure of coarse grained HAZ consisted of fine ferrite and pearlite and the mechanical properties of the joint were sufficient to meet all the requirements specified in classification rule.
Key Words: EH36-TM steel, Tandem EGW joint, HAZ touhness, Austenite grain size, TiN articles, High nitrogen contnet


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