Manufacture of low yield ratio hot rolled high tention steel plate for cold processing
专利汇可以提供Manufacture of low yield ratio hot rolled high tention steel plate for cold processing专利检索，专利查询，专利分析的服务。并且PURPOSE: To manufacture a low yield hot rolled high tension steel plate for cold processing by the procedure in which low-carbon steel or a steel piece containing Zr and a rare earth element is rolled in a specific temperature range and then coiled at less than 300°C.
CONSTITUTION: The steel slab containing 0.05 to 0.15% C, ≤0.70% Si, and 0.08 to 2.00% Mn, or a steel containing, besides the foregoing components, ≤0.015% S, Zr in a Zr/S ratio of 2 to 10, and a rare earth element(REM) in a REM/S ratio of 1.3 to 5 is heated for hot rolling in a temperature rnage of Ar
3 W(Ar
3 +40°C to form steel plate. In this case, the austenite granules in the steel are made finer, and then after air cooling or wear cooling, it is coiled at less than 300°C. The early crystallized ferrite and austenite during the cooling process after rolling are converted finally into a modified bainite-mixed structure, resulting in a steel plate for cold processing having a target strength and yield ratio.
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