Hydrogen in steel is highly mobile and this explains the unusual mechanical features of hydrogen embrittlement and the conflicting results of the many tests which were applied to disclose and measure hydrogen em-brittlement. The normal strength of a high-strength steel is found to be rarely affected while its ductility may be greatly reduced. Consequently the strength of test specimens and parts which depends upon ductility may also be much reduced by hydrogen embrittlement. Furthermore, these effects are pronounced at low rates of straining or sustained loading but probably of no signifi¬cance on impact loading.
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