High-spheroidization-rate high-carbon steel and preparation method thereof

• Main Authors: ZHANG HUIFENG, LI YUE, DENG SUHUAI, LIU KUN, LAI PING, WANG QUANLI, BAI FENGXIA, LIANG JIANGTAO, GUO HUIMIN, LI SHUJIA
• Format: Patent
• Language: Chinese; English
• Published: 05.08.2022
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention particularly relates to high-spheroidization-rate high-carbon steel and a preparation method thereof, and belongs to the technical field of steel preparation, and the steel comprises the following chemical components in percentage by mass: 0.80%-1.05% of C, 0.15%-0.45% of Si, 0.15%-0.80% of Mn, 0.10%-2.00% of Cr, 0.010%-0.10% of Nb, less than or equal to 0.015% of P, less than or equal to 0.015% of S and the balance of Fe and inevitable impurities. On the basis of high-carbon steel components, 0.01%-0.10% by mass of Nb is added, Nb is separated out after solid solution, the steel is promoted to form thin-sheet pearlite, and the spheroidizing rate can be further increased under the existing spheroidizing process. 本发明特别涉及一种高球化率高碳钢及其制备方法，属于钢材制备技术领域，钢的化学成分以质量分数计包括：C:0.80％-1.05％、Si:0.15％-0.45％、Mn：0.15％-0.80％、Cr：0.10％-2.00％、Nb:0.010％-0.10％、P≤0.015％、S≤0.015％，余量为Fe及不可避免杂质；在高碳钢成分基础上，添加了质量百分比为0.01～0.10％Nb，Nb在固溶后析出，促使钢形成细片状珠光体，能够在现有球化工艺下，进一步提高球化率。