| Issue |
Rev. Met. Paris
Volume 96, Number 10, Octobre 1999
|
|
|---|---|---|
| Page(s) | 1233 - 1242 | |
| DOI | https://doi.org/10.1051/metal/199996101233 | |
| Published online | 16 January 2017 | |
Hydrogen pressure build-up in blowholes at pickling of interstitial free steel*
Montée de la pression d’hydrogène dans les soufflures lors du décapage des aciers sans interstitiels
During continuous casting of Interstitial Free steel occasionally argon bubbles are entrapped in the solidifying shell. Some of these bubbles can be found in the final cold rolled sheet as elongated blisters, so-called blowholes. During processing, the steel is exposed to atomic hydrogen at the pickling process. Exposure to atomic hydrogen can lead to accumulation of molecular hydrogen in the blowholes, making them more apparent. This process is examined in this paper. The hydrogen diffusion behaviour is studied by a permeation technique, accumulation is modelled and the deformation process is studied by loading a blowhole with hydrogen electrochemically. The results and implications for pickling lines are discussed.
Subject of a presentation at the 1998 ATS International Steelmaking Conference (Paris, December 1-2, 1998, Session 8).
The authors would like to acknowledge the assistance of Kees Westerduin and Rogier van Meenen (IRI) with the permeation experiments. They also acknowledge the contributions of Marc van Genderen and Marco Appelman (Hoogovens R&D, height profile measurements).
© La Revue de Métallurgie 1999
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