Research and Development > JFE TECHNICAL REPORT >JFE TECHNICAL REPORT No.20 March 2015 - Special Issue on “Steel Plates” and “Welding and Joining” > High Performance 590 N/mm² Class Thermo-Mechanical Control Process (TMCP) Steel Plate “HBL^TM440” for Building Structure

No.20 March 2015 - Special Issue on “Steel Plates” and “Welding and Joining”

High Performance 590 N/mm² Class Thermo-Mechanical Control Process (TMCP) Steel Plate “HBL^TM440” for Building Structure

OHMORI Akio     NAKAGAWA Kei    MUROTA Yasuhiro

Abstract

Conventional 590 N/mm² class steel for building structures, SA440, has been manufactured by a multiple off-line heat treatment processes involving intercritically reheated quenching, in order to achieve low yield ratio required for seismic resistance buildings. High performance 590 N/mm² class thermo-mechanical control process (TMCP) steel plate “HBL^TM440” for building structures, which can be manufactured without an intercritically reheated quenching, has been developed by applying the uniquely advanced JFE Steel’ s on-line accelerated cooling system. The developed steel plates from 19 mm to 100 mm in thickness satisfy the specification of SA440 and exhibit excellent weldability and high heat affected zone (HAZ) toughness in welded joints with very large heat inputs. Furthermore members fabricated with the developed steel plates have achieved equivalent plastic behaviors to those of SA440.

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