Ultra-high carbon steel plate and manufacturing method thereof

The invention provides an ultra-high carbon steel plate and a manufacturing method thereof, and the ultra-high carbon steel plate comprises the following chemical elements in percentage by mass: 1.15-1.5%, preferably 1.15-1.25%, of C; si: 0.1% to 0.35%, preferably 0.1% to 0.25%; mn: 0.1% to 0.4%, preferably 0.3% to 0.4%; the content of Als is 0.02 to 0.05 percent, preferably 0.02 to 0.03 percent; p: 0 to 0.03%, preferably 0 to 0.015%; s: 0 to 0.03%, preferably 0 to 0.004%; and the balance of Fe and inevitable impurity elements. According to the method for manufacturing the ultra-high carbon steel plate based on the thin slab continuous casting and rolling process, the chemical element composition of the ultra-high carbon steel plate is optimized, the production process is optimized, the number of inclusions and element segregation are reduced, and the ultra-high carbon steel plate which is small in decarburization layer depth and high in strength is obtained. 本申请提供一种超高碳钢板材及其制造方法，其中超高碳钢板材以质量百分比计，具有以下化学元素组成：C：1