Abstract
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.
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