| 摘要 |
489,911. Making compound forms. DEUTSCHE ROHRENWERKE AKT.-GES. Oct. 29, 1937, No. 29608. Convention date, Jan. 16. [Classes 83 (ii) and 83 (iv)] Rolling.-Two or more metals are united by heating the layers, passing between them a flushing gas free of oxygen capable of reaction and then rolling the layers together in their heated condition. The flushing gas may be, e.g. purified nitrogen, a rare gas such as neon, argon, crypton, xenon or mixtures of these, hydrogen, compounds of nitrogen and hydrogen, carbon-monoxide, hydrocarbons, or mixtures of these. |
