| 摘要 |
To produce composite workpieces from two different grades of steel, a solid object of steel of one grade is coated with a 0.3 to 1 mm thick layer of a nickel-chromium-boron-silicon alloy. This layer is sprayed on, for example by flame-spraying. The object is then inserted into a casting mould and molten steel of the other grade is cast around it. The alloy of the coating has a substantially lower melting point than the steels. The coating can be applied in a simple manner and effects an intimate joint between the solid steel and the solidifying steel.
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