Process and apparatus for producing strip products from stainless steel

US5804056A · kind A · utility

Assignee

• Mannesmann AG · DE

Inventors

• Franz G. Pempera · Neuwied, DE
• Michael Haentjes · Essen, DE
• Andreas Jaenichen · Düsseldorf, DE
• Rainer Kilb · Düsseldorf, DE
• Horst Edel · Düsseldorf, DE
• Jurgen Flugge · Duisburg, DE

Key dates

• Filing date: Sep 13, 1996
• Grant date: Sep 8, 1998
• Expiry date: Sep 13, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B21B45/06
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process and apparatus for the continuous treatment of annealed and non-annealed hot strip of stainless steel. First, the hot strip is stretched, bent and straightened to break a scale which has grown on the hot strip. Then, a electrolytic pickling is performed in an electrolyte with multiple alternating anodically-connected and cathodically-connected strip polarization. Directly following thereafter, pickling once again takes place in the electrolyte with multiple anodically-connected electrodes arranged directly behind one another and corresponding cathodic strip polarization, followed by anodic strip polarization produced by means of a cathodically-connected electrode. To further remove any scale remaining on the surface of the hot strip, the hot strip is subject to high-pressure fluid spraying or brush aggregates. Renewed electrolytic pickling in performed with at least one electrolyte with multiple exclusively cathodically-connected electrodes and anodic strip polarization. Finally, post-treatments are performed such as washing, brushing, post-washing and drying of the strip surface.