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低温用低炭素Alキルド鋼KL33AおよびKL33Bについて

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.3 (1971) No.2

低温用低炭素Al キルド鋼 KL33A および KL33B について

Low Carbon Aluminum Killed Steel Plates for Low Temperature Use. -KL33A and KL33B-

有 村 康 男(Yasuo Arimura) 安田 達(Tohoru Yasuda) 片伯部 忠行(Tadayuki Katakabe) 要旨 : KL33A,および KL33B は,液化プロパン用(-45℃)よりさらに低温で使用される鋼板と して,川崎製鉄(株)が開発したものである。KL33A は焼ならし,KL33B は焼入れ焼も どし処理をほどこした鋼板であり,いずれも良好な機械的な質,切欠靱性を有している。 また溶接性もすぐれており,熱影響部の最高硬さはHv250 以下,-50℃での溶接ビード曲げ 試験の表面伸びは30%以上であり,斜めy型拘束割れ試験ルート割れ阻止温度は 20℃以下 である。 Synopsis :

This paper introduces KL33A and KL33B steel plates suited for applications at temperatures lower than -45℃ for liquified propane. KL33A is normalized and KL33B quench-tempered, both having good mechanical properties and notch thoughness. They have excellent weldability, with maximum hardness at heat-affected zone being Hv 250 and under, surface elongation at the bend test of weld bead at -50℃ being 30% and up, and temperatures at which to prevent root cracking under inclined Y-groove restricted cracking tests are 20℃ and under.

(c)JFE Steel Corporation, 2003

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