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The purpose of the study reported here was to create a new quality of hot rolled sheet, characterized by better mechanical and surface properties. The basis principle is to combine a continuous heat treatment with a gaseous reduction of the oxide, the intention being to achieve homogeneous mechanical properties. Tests have shown the possibility of effectively reducing practically the whole oxide layer of a hot rolled strip within times compatible with a continuous processing line. Since at high temperature the reduction occurs by bypassing the FeO phase whose reduction rate is slower, and since the recrystallization of the reduced iron slows down the diffusion, it is preferable to achieve the reduction at moderate temperature ( 570 C). If the reduction is followed by a heat treatment above the A3 point and a water quench, very attractive properties can be achieved. A tensile strength of 600 MPa together with dual phase properties is reached when using a low carbon steel with boron addition.

Additional information

Authors: PAULUS P, Centre de Recherches Métallurgiques, Liège (BE)
Bibliographic Reference: EUR 15471 FR (1996) 77pp., FS, ECU 10.00
Availability: Available from the (2)
ISBN: ISBN 92-827-6123-1
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