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ステンレス鋼および高炭素鋼スラブの連続鋳造

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.12 (1980) No.3

ステンレス鋼および高炭素鋼スラブの連続鋳造

Continuous Slab Casting of Stainless Steel and High Carbon Steel

反町 健一(Ken-ichi Sorimachi) 野村 寛(Hiroshi Nomura) 長谷川 衛(Mamoru Hasegawa) 糸山 誓司(Seiji Itoyama) 矢野 修也(Shuya Yano)

要旨 : フェライト系ステンレス鋼の連続鋳造において脱酸コントロール,およびスラブ表面性状 に及ぼす操業因子の影響について述べた。次にマルテンサイト系ステンレス鋼のスラブ表 面縦割れは鋳型内の冷却条件と凝固中の包晶反応に主に帰因することを定量的に解明した。 また,スラブハンドリング時のマルテンサイト変態を防止する新しい熱処理法を開発した。 一方,高炭素鋼では熱間強度が低く鋳型直下で内部割れが発生しやすいので,低速鋳造, 高比水量操業を行っている。鋳型~凝固シェルの間の潤滑不良に基づく拘束性ブレークア ウトは,新開発の鋳造異常センサによって防止できた。 Synopsis :

A deoxidation control of tha 17% Cr ferritic stainless steel and effects of operational factors on slab suface quality in continuous casting are discussed. Next, the fact that longitudinal surface cracks of martensitic stainless steel are mainly caused by primary cooling condition in the mold and peritectic reaction during the solidification is quantitatively described. Further, a new heat treatment method is proposed to avoid the martensitic transformation of cast slabs. On the other hand, low casting speed and high specific water flow-rate operation are adopted in high carbon steel to prevent internal cracks which are apt to occur just below the mold because of its low strength at high temperature. A break-out problem by improper lubrication between the mold and the solid shell was solved by the development of a new casting condition detector. (c)JFE Steel Corporation, 2003

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