1108.    FRY, A.  [Steels for Oil-Cracking Tubes and Hydrogenation Vessels.]  Oel u. Kohle, vol. 1, 1933, pp. 184-188; British Chem. Abs., 1934, B, p. 763.

        In the production of steels for hydrogenating vessels, methods are used, that is, addition of 6% of Cr or V, followed preferably by special annealing, which bind the C so that it resists reduction by the H₂ under the operating conditions; the further addition of Mo to the steel improves its durability.