Development of hot rolled high-strength steels with inherent corrosion resistance
Current steels utilised for underbody parts are usually metallic or organically coated. A steel offering the same or improved corrosion resistance, without the need for any coatings, offers significant cost savings. The aim of this work was to design a range of hot rolled high-strength steels with improved corrosion resistance leading to cost savings. The higher strength level would allow down gauging and the improved corrosion resistance may remove the need for any coatings. The aim was also to maintain if not improve the fatigue life of the steel. Weathering steels known for their corrosion resistance and another high-strength steel were chosen as base materials for the investigation. Laboratory casts were produced of these steels with alloy additions, including the REM cerium, known to improve corrosion resistance. Laboratory corrosion testing and hot rolling identified a composition and processing conditions giving good corrosion resistance. An industrial cast of the optimum composition was manufactured and hot rolled on a commercial strip mill. The objectives of the project were met. The industrial steel exhibited the best corrosion resistance of all the steels examined. The industrial cast composition was such that a range of higher strengths was achieved allowing weight reductions through down gauging. The fatigue and corrosion fatigue performance would be expected to be similar to TRIP steels. The industrial steel also exhibited good weldability and paintability.
Bibliographic Reference: EUR 21434 EN (2005), 190 pp. Euro: 25
Availability: http://bookshop.europa.eu/is-bin/INTERSHOP.enfinity/WFS/EU-Bookshop-Site/en_GB/-/EUR/ViewPublication-Start?PublicationKey=KINA21434 (Catalogue Number: KI-NA-21434-EN-S)
ISBN: ISBN 92-79-00081-0
Record Number: 200618437 / Last updated on: 2005-12-15
Original language: en
Available languages: en