| 摘要 |
In the art of moving metal at hot forgeable temperature through and reducing such metal in a hot rolling mill, engaging the metal by a roll and applying to the roll coolant at a temperature below the boiling point of water so that the roll is subjected to repeated heating and cooling cycles, the roll having a surface contacting the metal which surface is of chromium alloy steel which has simultaneously exceptional resistance to thermal fatigue cracking and good resistance to wear at the temperatures produced by contact with metal at hot forgeable temperature and which has the following composition:
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