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綿材および棒鋼製品のスケール特性

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.13 (1981) No.2

綿材および棒鋼製品のスケール特性

Pripertues if Scakes ib Steel Wire Rods and Bars

峰 公雄(Kimio Mine) 藤田 利夫(Toshio Fujita) 佐々木 徹(Toru Sasaki) 田中 智夫(Tomoo Tanaka) 佐藤 周三(Shiuzo Sato) 野田 昭雄(Akio Noda) 中尾 敏朗 (Toshiro Nakao) 要旨 : 熱間圧延綿材および綿鋼表面スケールの成長および剥離性におよぼす鋼中成分ならびに冷 却条件の影響をリムド,AI キルド,AI‐Si キルドおよび Si キルド鋼を用いて調査し,以 下の結果を得た。(1)スケールはS 量が増加するにつれ厚くなり,Si および AI 添加によ って減少する。(2)機械的な剥離性はスケール厚さ15μm 程度までは厚いほど向上し,ま た,スケールと地鉄の界面に生成するSi, AI および S 化合物により向上する。スケール厚 さが20μm 以上になると,薄い酸化物である magnetite seam が残るために,機械的剥離 後の残存スケールが増加する。(3)酸洗所要時間はスケール層が薄いほど短い。 Synopsis :

The present experiment was intended to investigate the effect of chemical composition and cooling condition on the growth and removal of scales formed on hot-rolled wire rods and bars of rimmed, Al-killed, AI-Si-Killed, and Si-killed steels. The results obtained are given below: (1) Scale thickness increases with an increasing S content. It is, however, reduced by the addition of Si and/or AI. (2) Scale properties suitable for mechanical descaling are improved with an increase in scale thickness within the range of less than 15μm. They are also improved by the formation of chemical compounds consisting of S, Si, and AI at the interface between base metal and the iron oxide layer. When the scale thickness exceeds 20μm, the amount of the residual scale after mechanical descaling increases with an increasing scale thickness, because thin film of magnetite has a propensity to remain on the base metal surface. (3) The thinner the scale layer, the shorter the pickling time.

(c)JFE Steel Corporation, 2003

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