船用曲轴45^(#)钢锻件的生产实践  

Production practice of 45^(#) Steel

作　　者：崔政 毛威昂 王瑞 王刘艳 张泽春 Cui Zheng;Mao Weiang;Wang Rui;Wang Liuyan;Zhang Zechun(Technology Center of Jianlongbeiman Special Steel Co.,Ltd.,Qiqihaer 016000,Heilongjiang,China)

机构地区：[1]建龙北满特殊钢有限责任公司研发部,黑龙江齐齐哈尔016000

出　　处：《特钢技术》2024年第1期11-14,共4页Special Steel Technology

摘　　要：船用发动机的重要组成部分就是曲轴,以45^(#)钢作为船用曲轴锻件的原料可以大幅度的降低成本,缓解市场压力。文章介绍了某钢厂通过35 t电炉+LF+VD→4.5 t异形锭模铸→锻造→正火→粗加工生产船用曲轴45^(#)钢锻件的实践情况。冶炼过程废钢使用表面无锈蚀的42CrMo短尺废料,精炼使用SiC粉扩散脱氧,真空后加Ti(按0.03%加入)、喂铝线,软吹25~30min,浇铸前对中注管和汤道砖两次充氩。锻造过程等温至950℃使用快锻机开坯、精锻机快速定型,终锻温度780~830℃。热处理工艺为865~875℃/2h正火,空冷;645~655℃/10h回火。经过检验分析,钢的化学成分控制稳定,钢水纯洁度高,w(P)≤0.008%,w(S)≤0.005%;一般疏松1.0、中心疏松1.0、无锭形偏析和点状偏析;半径1/2处晶粒度为6级;组织为珠光体+铁素体;带状组织1.5级,无魏氏组织,验证了制造工艺的合理性和可行性。Crankshaft is an important part of marine engine.Using 45^(#) steel as raw material of marine crank-shaft forgings can greatly reduce cost and relieve market pressure.This paper introduces the production practice of 45^(#) steel forgings of crankshaft for ship by 35t EAF+LF+VD→4.5t special-shaped ingot casting→forging→normal-izing→roughing.During the smelting process,scrap steel shall be made from 42CrMo scrap without rust on the sur-face,refined with SiC powder for diffusion and deoxidation,vacuum followed by addition of Ti(0.03%),aluminum feeding wire,soft blowing for 25~30 minutes,and argon filling into the central injection pipe and the Tang Dao brick twice before casting.Forging process isothermal to 950℃ using fast forging machine blank,precision forging machine rapid finalization,final forging temperature 780~830℃.The heat treatment process is 865~875℃/2h normalization,air cooling;645~655℃/10h tempering.After testing and analysis,the chemical composition of the steel is stable,the purity of the molten steel is high,w(P)≤0.008%,w(S)≤0.005%;general porosity 1.0,central porosity 1.0,no ingot segregation and no dot segregation;the grain size of 1/2 radius is grade 6,the structure is P+F;banded structure grade 1.5,no Widmanstatten structure,verifying the rationality and feasibility of the manufacturing process.

关 键 词：45^(#)钢 船用曲轴 化学成分 力学性能 生产工艺 

分 类 号：TF761.3[冶金工程—钢铁冶金]