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Abstract

Lubricants for cold rolling of stainless steel have a major influence on surface quality of the rolled products and productivity. Up to now only oils are used in cold rolling of bright and annealed stainless steel in Sendzimir mills. The producers constantly try to optimise the efficiency of productivity of their facilities but cold rolling mills are very seldom used to full mechanical capacity. Therefore, the aim of this project research was to increase productivity of staimless steel rolling mills by use of new lubricants (neat oils and emulsions)

The positive results generated by extensive pilot tests on cold rolling, ageing effects and emulsion maintenance and proved in industrial cold rolling tests are:
- Surface qualities of 2 B were generated by using emulsions for rolling stainless steel.
- The best surface results were achieved for ferretic steels.
- The increase of productivity of about 20-25% for 2 B-surfaces is possible, because of higher rolling forces. These can be realised by higher heat capacity behaviour emulsions. The result is a decrease reduced number of passes.
- Emulsions have very good cleaning properties. There are no dry residues after annealing.
- New rolling schedules have to be created, especially regarding the changed forward and backward slip.
- The new construction of a rolling mill circuits based on lubrication with emulsions or the adaption of existing rolling mill circuits for the usage of emulsions is possible.

The achieved important results have fulfilled the expectations. Using emulsions in cold rolling mills increases efficiency of productivity by reaching higher reduction rates per pass. Surface qualities of class 2 B have been reached and qualities of 2 R (BA) are reachable in the future.

Additional information

Authors: SCHMIDT B, VDEh, Dusseldorf (DE);REICHARDT T, VDEh, Dusseldorf (DE);LANGE K M, Thyssenkrupp Nirosta GmbH, Dusseldorf (DE);CONRAD F, UGINE & ALZ, Groupe Arcelor, Gueugnon (FR);HAURET G, IRSID, Groupe Arcelor, Maizieres-les-Metz (FR);SILTARI T, AvestaPolarit Stainless Oy, Torino (IT)
Bibliographic Reference: EUR 20934 EN (2004), 119 pp. Euro: 25
Availability: EUR-OP reference: KI-NA-20934-EN-S Available from EUR-OP sales agents URL: http://publications.eu/general/en/publications_en.htm
ISBN: ISBN: 92-894-7464-5
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