The invention provides manufacturing a press formed product with high corrosion resistance and different tensile strengths depending on regions by a small number of processes. The whole of a steel plate having an aluminum-based plating film is heated to an austenite range temperature by a furnace, so that the body of the steel plate is transformed into austenite and a Fe—Al alloy layer is formed on the surface of the steel plate. The steel plate formed with the Fe—Al alloy layer is taken out from the furnace, a first region of the steel plate is heat-retained by a heat resistant and retaining member, and a second region of the steel plate is cooled naturally. When the temperature of the second region becomes lower than a ferrite transformation start temperature, hot press forming is performed to the steel plate to form a press formed product.
METHOD OF MANUFACTURING PRESS FORMED PRODUCT
2019-01-10
Patent
Elektronische Ressource
Englisch
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