高性能BTP500稀土微合金化钢板的研制与开发  

Research and development of high performance BTP500rare earth microalloyed BTP500slab steel plate

作　　者：董丽丽 刘泽田 白海瑞 DONG Lili;LIU Zetian;BAI Hairui(Technology Center,Inner Mongolia Baogang Steel Union Co.,Ltd.,Baotou 014010,China;School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]内蒙古包钢钢联股份有限公司技术中心,内蒙古包头014010 [2]河北工业大学材料科学与工程学院,天津300130

出　　处：《轧钢》2025年第1期50-56,共7页Steel Rolling

基　　金：中央引导地方科技发展资金项目(2022ZY0035)。

摘　　要：根据装甲防护钢板相关技术要求,通过稀土微合金化的化学成分设计和冶炼、轧制、热处理等工艺流程设计,成功开发了高性能BTP500稀土微合金化钢板。试制结果表明:BTP500板坯铸态组织为典型的上贝氏体,夹杂物评级为细类0.5级;轧态BTP500钢板微观组织为贝氏体,淬火后转变为马氏体组织,回火后为回火马氏体组织,原始奥氏体平均晶粒尺寸为10.5μm,各工序细小均匀的显微组织保证了成品钢板的综合力学性能。同一张成品钢板屈服强度为1412~1448 MPa,抗拉强度为1588~1624 MPa,伸长率为9.0%~10.0%,硬度为490HBW~520HBW,-40℃冲击功为29~48J,其拉伸性能、低温冲击韧性、硬度及冷弯性能均符合技术要求,且具有良好的同板性能;一致性。According to the related technical requirements of armor protective plate,through the chemical composition design of rare earth microalloying and the process design of smelting,rolling and heat treatment,the high-performance BTP500rare earth microalloyed plate has been successfully developed.The results show that the BTP500slab structure is typical upper bainite,and the inclusions are graded as fine class 0.5.The microstructure of rolled BTP500steel plate is bainite,which is transformed into martensitic structure after quenching,and tempered martensitic structure after tempering.The average grain size of the original austenite is 10.5μm.The fine and uniform microstructure at each process ensures the comprehensive mechanical properties of the finished plate.The yield strength of the same finished plate is 1412-1448MPa,the tensile strength is 1588-1624 MPa,the elongation is 9.0%-10.0%,and the hardness is 490HBW-520HBW.The impact absorption energy at-40℃is between 29Jand 48J,and its tensile properties,low temperature impact toughness,hardness and cold bending properties all meet the technical requirements,and it has a good consistency of the whole plate performance.

关 键 词：BTP500钢板 稀土 微合金化 工业化试制 显微组织 同板性能 一致性 

分 类 号：TG142.1[一般工业技术—材料科学与工程]