GERMANY Stress corrosion in highly‐stressed steels. A description is given of the appearance of cracks of a predominantly transcrystalline character in ordinary and alloyed heat‐treated steels used in condensation units of high‐pressure plants, and experiments made to get these appearances under laboratory conditions. These cracks may be caused by the hydrogen resulting from very slight corrosion on the surface of the steel when in the presence of certain specific active substances, especially hydrogen sulphide. The hydrogen penetrates the metal, where, as a result of recombination, it creates very high local pressures. Extensive research has been undertaken in the U.S.A. in connection with similar phenomena appearing in the mineral oil industry.
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