Medium-high carbon steel and preparation method thereof

• Main Authors: WANG SHENDE, WANG JING, DENG ZHIXUN, DAI ZHICAI, LI QIANGQI, ZENG BIN, XIE SENLIN, WU DAWEI, XIAO LEI, LUO GANG, HAN WENBING, GUO ZHENGWEI
• Format: Patent
• Language: Chinese; English
• Published: 19.09.2023
• Subjects: ALLOYS; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; METALLURGY OF IRON; PERFORMING OPERATIONS; POWDER METALLURGY; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TRANSPORTING; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses medium-high carbon steel and a preparation method thereof, and relates to the technical field of steel. The preparation method comprises the following steps of converter smelting, ladle furnace refining, RH vacuum refining and thin slab continuous casting. The molten steel subjected to RH vacuum refining is prepared from the following elements in percentage by mass: 0.3 percent to 0.55 percent of C, 0.008 percent to 0.012 percent of P, 0.2 percent to 0.3 percent of Si, 0.3 percent to 0.8 percent of Mn, 0.002 percent to 0.003 percent of S, 0.02 percent to 0.03 percent of Al, 0.0001 percent to 0.001 percent of H and the balance of Fe. And the continuous casting covering slag is prepared from 9%-12% of Na2O, 2%-3% of Li2O, 8%-11% of F, 20%-27% of CaO and 22%-28% of SiO2. The medium-high carbon steel prepared through the preparation method is good in inclusion, and the ductility is improved. 本发明公开了一种中高碳钢及其制备方法，涉及钢铁技术领域；该制备方法包括以下步骤：转炉冶炼、包炉精炼、RH真空精炼和薄板坯连铸；RH真空精炼后钢水由以下质量分数的元素组成：C 0.3％～0.55％、P