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日本川崎钢铁公司为使汽车车轮部分零部件轻量化，开发了成形性和疲劳强度好的540～780MPa级高强度热轧钢板“RH540DH～RllA780DH”。该种钢板选用最佳化学成分和采用最佳热轧条件轧制，得到微细T江析出强化的铁索体和马氏体双相组织。该显微组织对热轧钢板有以下作用。1）这一
Kawasaki Steel Corporation of Japan has developed a high-strength hot-rolled steel plate “RH540DH to RllA780DH” of 540 to 780 MPa class with good formability and fatigue strength in order to reduce the weight of parts of vehicle wheels. The kind of steel selection of the best chemical composition and the use of the best hot rolling conditions, the fine T Jiang precipitation enhanced ferrite and martensite duplex structure. This microstructure has the following effects on the hot-rolled steel sheet. 1) this one