Abstract
The Water-Quench System developed by NKK has a advantage of producing high strength cold rolled steel sheet with low cost.However, when it is used for the production of drawing quality (DQ) cold rolled steel sheet, the process can not prevent the excess cooling. Therefore, additional energy cost is necessary to raise the strip temperature to the temperature required for the overaging treatment. To overcome this disadvantage, NKK has newly developed the Roll Quench (RQ) process which does not produce this reheating energy cost.The RQ process consists of cooling the steel strip by contact with internally water-cooled rolls. For the development of RQ process, various basic heat transfer data were requested for the design of system. Contact thermal conductance between the surface of strip and roll were investigated. Thermal behaviors of roll shell were analyzed through theoretical simulation. Mathematical model of the RQ process was established, which is useful for both the design and operation of RQ process.
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