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ほうろうのつまとび現象に関与する鋼板要因の評価法

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.7 (1975) No.2

ほうろうのつまとび現象に関与する鋼板要因の評価法

Evaluation of Fishscale Susceptibility of Enamelling Sheet Steels

高橋 功(Isao Takahashi) 安田 顕(Akira Yasuda) 伊藤 健治(Kenji Ito) 大橋 延夫(Nobuo Ohashi) 要旨 : ほうろう用鋼板の耐つまとび性について 2 つの試験方法を調べた。その一つは,片面ほう ろう掛けを行った試片に陰極電解により水素をチャージし,つまとびが発生するまでの時 間を求める方法である。ほうろう条件が同一であれば,つまとび発生時間は鋼板の耐つま とび性の目安となりうる。第 2 の方法は,鋼板自身の水素透過性を電解法で測定するもの で,条件つきではあるが,水素透過時間は鋼板の耐つまとび性の尺度となりうる。両方法 を用いて,ほうろう用鋼板の幅端部の耐つまとび性を調べた結果,つまとび性と鋼中酸素 量の間には密接な関係があり,この部分の中で酸素量のもっとも低くなる場所でつまとび 感受性が高くなることがわかった。また焼成前の鋼板に20%までの冷間加工を与えたとき の耐つまとび性におよぼす影響も検討した。 Synopsis :

Two test methods have been investigated for the evaluation of fishscale susceptibility of enamelled sheet steels. In the first test, the sheet specimen enamelled on one side only is cathodically charged with hydrogen, and the time needed for the initiation of fishscale is measured. This time can be used in evaluating the fishscale susceptibility of the steel, if the enamelling process is controlled under a fixed condition. The second one is to measure the hydrogen permeation lag time of steel itself by the electrolytic method. The breakthrough time of hydrogen is also indicative of the fishscale susceptibility of the steel under certain restrictions. Using these two methods, the fishscale susceptibility at the edge part of the enamelling decarburized steel sheet has been studied. A close correlation exists between the fishscale susceptibility and the oxygen content in steel, and high fishscale sensitivity is detected at a place where oxygen content is the lowest in the edge part. The influence on the fishscaling by the cold reduction performed up to 20% to the sheet before enamelling is also discussed.

(c)JFE Steel Corporation, 2003

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