| 摘要 |
The present invention is directed to a method and apparatus of producing a dual-phase galvanized steel strip with improved formability while maintaining a high tensile strength. The present invention comprises a step of cooling and a step of reheating. In the cooling step, the galvanized steel strip has a temperature reduction of from about 300° C. to about 150° C.-250° C. This step of cooling should cool to a maximum extent of about 150° C. different between the initial temperature and the final temperature. This cooling may be accomplished by a hot water quench, or the use of a cooling tower, or other means. The step of reheating should follow the step of cooling. The step of reheating should heat the galvanized steel strip to a temperature of about 340°-390° C. This reheating causes the martensite in the galvanized steel strip to be tempered at a relatively low temperature, which reduces the Fe-Zn phase formation in the GI-coating.
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