Hydrogen peroxide pickling scheme for stainless steel grades

Details Hydrogen peroxide pickling scheme for stainless steel grades Hydrogen peroxide pickling scheme for stainless steel grades

C - Chemistry, Metallurgy

23

G

C23G 1/08 (2006.01) C23G 3/02 (2006.01)

Patent

CA 2443695

The present invention relates to a process for pickling hot rolled, hot rolled & annealed, and cold rolled & annealed stainless steel strip in a continuous fashion. The process comprises a series of pre-pickling tanks and pickling tanks, and optionally includes a scrubber-brush tank, a de-smutting tank, a filtration unit and a heat exchanger. The process includes a HF/U2SO4 pre- pickle and a UF/U2SO4/U2O2 pickling step.

La présente invention concerne un procédé de décapage d'une bande d'acier inoxydable laminée à chaud, laminée à chaud et recuite, puis laminée à froid et recuite de manière continue. Ce procédé fait intervenir une série de réservoirs de pré-décapage et de réservoirs de décapage, et éventuellement un réservoir de brosse à laver, un réservoir d'élimination du dépôt, une unité de filtration et un échangeur thermique. Ledit procédé comprend un pré-décapage au HF/H¿2?SO¿4? et une opération de décapage au HF/H¿2?SO¿4?/H¿2?O¿2?.

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