Development of 500 MPa Grade Forklift Gantry Steel C250b
摘 要
为满足用户定制的C250b门架型钢屈服强度不低于500 MPa,抗拉强度不低于610 MPa,断后伸长率不小于17%,-20℃冲击功不低于27 J的指标要求,设计了C-Mn-Nb-V-Cr-N体系钢,参考实际生产工艺,在不同的开轧温度和终轧温度下对试验钢进行精轧,研究了试验钢的组织和力学性能,分析了其强化机制。结果表明:设计试验钢的化学成分(质量分数/%)为0.16~0.20 C,0.40~0.50 Si,1.50~1.60 Mn,0.35~0.45 Cr,微量Nb+V,试验钢经精轧和空冷后的组织为铁素体+珠光体组织;当开轧温度控制在920~970℃,终轧温度控制在820~870℃时,试验钢的平均晶粒尺寸不大于7 μm,力学性能参数满足指标要求;试验钢固溶强化对屈服强度的贡献值约为240 MPa,细晶强化的贡献值为177~191 MPa,第二相析出强化的贡献值约为100 MPa。
Abstract
Mn-Nb-V-Cr-N series steel was designed in order to meet the requirements of C250b gantry steel customized by users with yield strength of not less than 500 MPa, tensile strength of not less than 610 MPa, percentage elongation after fracture of not less than 17%, and impact energy at -20 ℃ of not less than 27 J. According to the actual production process, the test steel was finishing rolled at different initial rolling temperatures and end rolling temperatures. The microstructure and mechanical properties of the test steel were studied, and the strengthening mechanism of the test steel was discussed. The results show that the designed steel had the chemical composition (mass fraction/%) of 0.16-0.20 C, 0.40-0.50 Si, 1.50-1.60 Mn, 0.35-0.45 Cr, trace Ni and V, and the microstructure of the steel was ferrite + pearlite after finishing rolling and air cooling. When the initial rolling temperature was 920-970 ℃ and the end rolling temperature was 820-870 ℃, the average grain size of the test steel was no greater than 7 μm; the mechanical property parameters of the test steel met the requirements. The contribution of solution strengthening in the test steel to the yield strength was about 240 MPa, that of fine-grain strengthening was 177-191 MPa, and that of precipitation strengthening of the second phase was about 100 MPa.
中图分类号 TG142.1 DOI 10.11973/jxgccl202109008
所属栏目 新材料 新工艺
基金项目 国家高技术研究发展计划项目(2015AA03A501)
收稿日期 2021/1/13
修改稿日期 2021/8/16
网络出版日期
作者单位点击查看
备注霍喜伟(1983-),男,河南许昌人,高级工程师,硕士
引用该论文: HUO Xiwei,GAO Cairu,SONG Yuqing,TIAN Yudong,DU Linxiu,QIAO Peng. Development of 500 MPa Grade Forklift Gantry Steel C250b[J]. Materials for mechancial engineering, 2021, 45(9): 40~44
霍喜伟,高彩茹,宋玉卿,田余东,杜林秀,乔鹏. 500 MPa级叉车门架型钢C250b的研制[J]. 机械工程材料, 2021, 45(9): 40~44
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【3】张启君, 宋玉萍, 马瑞永, 等.国内外叉车行业现状及发展战略探讨(一)[J].建筑机械化, 2003, 24(9):5-8. ZHANG Q J, SONG Y P, MA R Y, et al.Present situation of the forklift industry at home and abroad andits development stratagem(1)[J].Construction Mechanization, 2003, 24(9):5-8.
【4】贾桢桢.协同努力应对门架型钢发展瓶颈[J].叉车技术, 2006(4):3-4. JIA Z Z.Coordinate efforts to deal with the bottleneck of portal steel development[J].Forklift Truck Technology, 2006(4):3-4.
【5】余晓贤.现代电动叉车的结构及技术特点分析[J].现代制造技术与装备, 2018(11):58-58. YU X X.Analysis of the structure and technical characteristics of modern electric forklifts[J].Modern Manufacturing Technology and Equipment, 2018(11):58-58.
【6】纪进立.耐低温高强度门架型钢的开发[J].天津冶金, 2016(1):25-27. JI J L.Development of low temperature resistant high strength gantry section steel[J].Tianjin Metallurgy, 2016(1):25-27.
【7】刘圣.Q420D热轧高强耐低温叉车门架槽钢的研究开发[J].河南冶金, 2015, 23(2):11-13. LIU S.Study and development of Q420D hot-rolled high strength low temperature channel steel for fork tractor gate frame[J].Henan Metallurgy, 2015, 23(2):11-13.
【8】赵圣功.Q440C级25号门架槽钢质量控制[J].世界钢铁, 2013, 13(4):50-53. ZHAO S G.Quality control of Q440C class 25# gantry channel beam[J].World Iron & Steel, 2013, 13(4):50-53.
【9】王有铭, 李曼云, 韦光.钢材的控制轧制和控制冷却[M].2版.北京:冶金工业出版社, 2009. WANG Y M, LI M Y, WEI G.Controlled rolling and cooling of steel[M].2nd ed. Beijing:Metallurgical Industry Press, 2009.
【10】高彩茹, 刘宝喜, 潘欢, 等.高韧性420 MPa级桥梁钢开发及强化机制分析[J].东北大学学报(自然科学版), 2018, 39(8):1123-1126. GAO C R, LIU B X, PAN H, et al.Development and strengthening mechanism of 420 MPa grade bridge steel with high toughness[J].Journal of Northeastern University (Natural Science), 2018, 39(8):1123-1126.
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【13】张彦章, 王佩鑫, 孙伟.Q345轧制工艺温度对力学性能的影响[J].天津冶金, 2016(1):28-30. ZHANG Y Z, WANG P X, SU W.Influence of Q345 rolling process temperature on mechanical properties[J].Tianjin Metallurgy, 2016(1):28-30.
【14】高彩茹.500MPa级超级钢开发及使用性能的研究[D].沈阳:东北大学, 2006. GAO C R.Development of 500 MPa grade super-steel and study on its usage performance[D].Shenyang:Northeastern University, 2006.
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【16】小指军夫. 控制轧制·控制冷却——改善钢材材质的轧制技术发展[M].李伏桃, 陈岿, 译.北京:冶金工业出版社, 2002:6-13. KOZASU I. Controlled rolling and controlled cooling-Technological evolution in enhancement of mechanical properties through hot rolling[M]. LI F T, CHEN K Y, Transl. Beijing:Metallurgical Industry Press, 2002:6-13.
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