在日本,强度达60kg/mm~2的热轧铁素体—马氏体双相钢用于制造汽车轮盘,已有5年多了。比普通钢板重量轻、强度高的钢板,正日益为日本汽车工业界接受。过去主要采用强度为45kg/mm~2的低碳钢,目前正由成形性好、强度高(55～60kg/mm~2)的钢板取代。这种变化达到了重量实质性减轻的效果。本文主要研究了高强度汽车钢板的疲劳性能、钢的微观结构和疲劳微观损伤。 In Japan, hot-rolled ferritic-martensitic duplex steels up to 60 kg / mm 2 have been used in the manufacture of car roulette for more than five years. More lightweight than ordinary steel, high strength steel, is increasingly accepted by the Japanese automotive industry. In the past, mild steel with an intensity of 45 kg / mm ~ 2 was mainly used and was being replaced by a steel plate with good formability and high strength (55-60 kg / mm 2). This change achieved a substantial weight reduction effect. This paper studies the fatigue properties of high strength automotive steel, microstructure and fatigue microstructure of steel.