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土木建築構造用新高機能鋼材

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川崎製鉄技報

KAWASAKI STEEL GIHO Vol.27 (1995) No.4

土木建築構造用新高機能鋼材

High Performance Steels for Civil Engineering and Building Structure Uses

川 端 文 丸(Fumimaru Kawabata) 吉 里 勉 (Tsutomu Yoshizato) 谷 川 治 (Osamu Tanigawa) 要旨 : 土木建築構造用新機能鋼材として,低YR高張力鋼,極低降伏強度鋼,耐火鋼,低予熱型 HT780 鋼,TMCP極厚H形鋼およびテーパプレートについて材質とその実現のための組 織制御を紹介した。低YR特性に代表される鋼材の機能は,降伏現象の制御によって実現 されており,複合組織制御により600N/mm2級まで高張力鋼板が開発されている。また, 780N/mm2を超える高強度鋼の実用を組んでいた溶接割れ感受性を低下する技術は,加 工熱処理プロセス(TMCP)の有効かつ積極的な利用により実現されており,橋梁用H T780 や極厚H形鋼に見られるように厚肉高強度化の要求に応えている。 Synopsis :

Typical items of growing interest in civil engineering and building structures were reviewed in the light of specific mechanical properties and microstructure controls, which included the low YR high strength steel, the ultra-low yield steel, the fire resistant steel, the 780 N/mm2 class steel of low preheat type and the heavy-wall H-shapes enhanced by TMPC and tapered plates. Low YR property is one of fundamental functions and materialized by the control of yielding behavior with a duplex microstructure and reached 600 N/mm2 class. Thermo-mechanical control process (TMCP) has practically progressed the application of high strength steel of 780 N/mm2 class by accomplishing the low preheat temperature below 50℃ and fairly improved the weldability and toughness of the heavy-wall H-shapes.

(c)JFE Steel Corporation, 2003

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