Tests were made to determine the effect of cold reduction on hydrogen solubility in steel. It was found that this direct relationship persisted through subsequent heat-treatment and later cold reduction. This was not true, though, of hydrogen permeability. Increasing the amount of cold reduction increased the hydrogen solubility. Increasing the amount of cold reduction also increased the hydrogen permeability until a maximum was reached (below 30 percent reduction for initially hot-rolled steel), after which the permeability decreased as the amount of cold work increased. 3.7.3

Discusses an investigation which shows that cold work markedly affects hydrogen's entry, solubility and desorption rate in steel. Also clarifies effect of processing variables on hydrogen behavior in steel. Includes discussion of materials, apparatus, environmental conditions and procedures used in experiments. 3.7.3

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Experiments to determine the effect of cold reduction on the behavior of hydrogen in highpurity sheet iron were conducted using two laboratory-melted heats. One heat was air-melted and poured and contained 0.00470 carbon and 0.1'7% oxygen; the other was vacuum-melted and poured and contained 0.003% carbonand 0.006% oxygen. An increase in hydrogen solubility (acid-charged) with increasing cold reduction was observed for both lots. The hydrogen solubility increase occurring from 0 to 80% cold reduction was much more pronounced, however, for the lot containing the higher amount of oxygen. Ground-coat reboiling tests were made on both lots of high-purity iron. The material containing high oxygen exhibited light reboiling for all levels of cold reduction, whereas the material containing low oxygen exhibited light reboiling for intermediate levels of cold reduction and heavier reboiling for low and for high levels of cold reduction. For the coldreduced material containing high oxygen, the frequency of delayed defects decreased with increasing cold reduction. For the purer material, delayed defects were observed only for the specimens having the highest level of cold reduction.