摘要
为保证高强HRB400E钢筋的力学性能,其化学成分中需添加Si、Mn、Nb、V、Ti等合金元素。我国Ti储量较大,其售价相对较便宜,为进一步降低成本,采用节能减耗的直接轧制工艺对含Ti高强HRB400E带肋钢筋进行了研发。设计了含Ti高强HRB400E带肋钢筋的化学成分;由于Ti元素易被氧化,金属收得率低,研究了合金加入方式对Ti收得率的影响;开发了铸坯温度均匀性控制系统,以解决直接轧制铸坯头尾温差较大的问题;设计了3种控轧控冷工艺对含Ti高强HRB400E带肋钢筋进行了试制。结果表明:采用在出钢后喂钛包芯线的方式,Ti元素收得率可达到48%~53%;采用直轧铸坯温度均匀性控制系统,连铸坯头尾温度波动由100℃缩小到40~50℃,满足开轧温度要求;采用控轧控冷工艺,可进一步发挥Ti元素细晶强化作用,且将上冷床温度控制在900~950℃范围,HRB400E钢筋组织晶粒度达到10级,钢筋力学性能和表面质量综合性能最佳。
To ensure the mechanical properties of high strength HRB400E bars,alloying elements such as Si,Mn,Nb,V,Ti,etc.need to be added to their chemical composition.China has a large reserve of Ti and its selling price is relatively cheap.In order to further reduce costs,an energyconservation and comsumption reduction direct rolling process was adopted to develop Ti-containing high strength HRB400E ribbed bars.The chemical composition of Ti-containing high strength HRB400E ribbed bars was designed.Due to the easy oxidation of Ti element and low metal yield,the influence of alloy addition method on Ti yield was studied.A temperature uniformity control system for casting billets was developed to solve the problem of large temperature differences between the head and tail of directly rolled casting billets.Three controlled rolling and controlled cooling processes were designed for the trial production of Ti-containing high strength HRB400E ribbed bars.The results showed that by feeding titanium core wire after steelmaking,the yield of Ti element could reach 48%-53%.By adopting a temperature uniformity control system for directly rolled casting billets,the temperature fluctuation at the head and tail of the continuous casting billets has been reduced from 100℃to 40-50℃,meeting the requirements for the initial rolling temperature.By adopting controlled rolling and controlled cooling technology,the fine grain strengthening effect of Ti element can be further enhanced,and the temperature upon cooling bed can be controlled within the range of 900-950℃.The grain size of HRB400E bar structure reaches level 10,and the comprehensive performance of steel bar mechanical properties and surface quality is the best.
作者
郭新文
徐兵伟
王利军
解彦波
GUO Xinwen;XU Bingwei;WANG Lijun;XIE Yanbo(Shougang Changzhi Iron and Steel Co.,Ltd.,Changzhi 046031,China)
出处
《轧钢》
北大核心
2025年第3期117-120,共4页
Steel Rolling
关键词
含Ti高强HRB400E带肋钢筋
直接轧制
喂线
铸坯头尾温差
控轧控冷工艺
节能减耗
低成本
Ti-containing high strength HRB400E ribbed bars
direct rolling
wire feeding
temperature difference between the head and tail of the casting billet
controlled rolling and controlled cooling process
energy conservation and consumption reduction
low cost
