C - Chemistry – Metallurgy – 23 – F
Patent
C - Chemistry, Metallurgy
23
F
149/15, 148/34.4
C23F 1/44 (2006.01) B21B 45/06 (2006.01) B24B 27/033 (2006.01) C21D 9/52 (2006.01) C23F 4/04 (2006.01) C23F 17/00 (2006.01) C23G 5/00 (2006.01) B21B 3/02 (2006.01)
Patent
CA 2040786
A descaling method for removing oxide scale from a hot-rolled stainless steel comprising the steps of: applying a solution of an alkaline earth metal chloride to the surface of the oxide scale layer formed on the hot-rolled stainless steel strip, and allowing the solution to penetrate into the oxide scale layer. In a subsequent annealing, the solution is heated and dehydrated to become solid matter and the dehydrated matter is melted and diffused into the oxide scale layer to soften the oxide scale layer. The oxide scale layer is then removed by a simple mechanical descaling by, for example, grinding brushes with or without a subsequent chemical descaling by a weak acid solution.
Méthode de décalaminage permettant d'enlever la calamine de l'acier inoxydable laminé à chaud comprenant les étapes suivantes : appliquer une solution de chlorure alcalino-terreux à la surface de la couche de calamine formée sur la bande d'acier inoxydable laminé à chaud, et laisser entrer la solution dans la couche de calamine. Lors du recuit subséquent, la solution est chauffée et déshydratée et devient une matière solide, et la matière déshydratée est fondue et diffusée dans la couche de calamine afin de l'amollir. La couche de calamine est ensuite éliminée au moyen d'un simple décalaminage mécanique, à l'aide de meules de polissage avec ou sans décalaminage ultérieur grâce à une solution faiblement acide.
Ishibashi Genichi
Kaito Hiroyuki
Katsuki Yasuhiro
Sato Kuniaki
Kawasaki Steel Corporation
Moffat & Co.
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