Community Research and Development Information Service - CORDIS

Abstract

The production of high-alloyed steel plates and sheets involves several problems of shape control during and after hot rolling (width control) or even after cold rolling (waves, roping).
These shape defects result from the behaviour of the prior solidification microstructure during the first steps of hot rolling. Clearly, different solidified zones appear in the slabs such as columnar and equiaxed grains. Their distribution depends on the solidification conditions. Moreover, chemical segregation is also dependent on these conditions. All these phenomena lead to an anisotropy of the material at least during the first rolling passes, before recrystallisation. The problem is particularly important for the materials where the solidification microstructure is retained until the first rolling passes.
So, the practical aims of this project are:
- to control the dimensions of flat products, by making savings on material, energy, time and processing costs (better know-how of anistropic behaviour and determination of the more consistent thermo-mechanical cycles during hot-rolling,
- to increase the service properties of the delivered products (improvement of the homogeneity of structure).
The project has been focussed on different stainless steels produced in various conditions (chemical composition, casting conditions) leading to various solidification structures (particularly different percentage of equiaxed grains): two ferritic stainless steels (X6Cr17 and X2CR12) cast with and without modifying the chemical composition, one austenitic-ferritic steel (X2CrNi MoCUN25.6.3) and one super-austenitic steel (X1CrNi MoCu24.22.6.3).

Additional information

Authors: POITRAULT I, Industeel, Le Creusot (FR);SASS L, ThyssenKrupp Nirosta GmbH, Dusseldorf (DE);SALVATORI I, CSM, Rome (IT);TSCHIRNICH M, IBF/ RWTH, Aachen (DE);FEUILLU D, IRSID, Maizieres-les-Metz (FR)
Bibliographic Reference: EUR 20937 EN (2004), 134 pp. Euro: 25
Availability: EUR-OP reference: KI-NA-20939-EN-S Available from EUR-OP sales agents URL: http://publications.eu/general/en/publications_en.htm
ISBN: ISBN: 92-894-7489-0
Record Number: 200417616 / Last updated on: 2004-07-06
Category: PUBLICATION
Original language: en
Available languages: en