Hot-rolled steel plate exhibiting excellent cold workability and excellent surface hardness after working
A technology of surface hardness and hot-rolled steel plate, which is applied in the field of hot-rolled steel plate, can solve the problems of low cost and achieve the effects of reduced deformation resistance and extended life
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[0121] [Preparation of molten steel]
[0122] Regarding the content of N in the molten steel, it can be determined by adding a raw material containing N compounds to the molten steel during smelting with a converter, and / or controlling the atmosphere of the converter to N 2 atmosphere to adjust.
[0123] [heating]
[0124] Heating before hot rolling is performed at 1100 to 1300°C. In this heating, high-temperature heating conditions are required in order to dissolve as much N as possible without forming N compounds. A preferable lower limit of the heating temperature is 1100°C, and a more preferable lower limit is 1150°C. On the other hand, temperatures higher than 1300°C are operationally difficult.
[0125] [hot rolled]
[0126] Hot rolling is performed so that the finish rolling temperature may be 880° C. or higher. If the finish rolling temperature is too low, the ferrite transformation will occur at a high temperature, the precipitated carbides in the ferrite will b...
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