棒线材直轧工艺中小方坯连铸技术的应用  

Application of small billet continuous casting technology in bar and wire direct rolling process

作　　者：刘权 张敏科 张元 董富利 王哲明 LIU Quan;ZHANG Minke;ZHANG Yuan;DONG Fuli;WANG Zheming(Sinosteel Equipment and Engineering Co.,Ltd.,Beijing 100080,China;Shanxi Hongda Iron and Steel Co.,Ltd.,Hejin 043300,China;Dalian Baihe Oxygen Spray Head Co.,Ltd.,Beijing 116023,China)

机构地区：[1]中钢设备有限公司,北京100080 [2]山西宏达钢铁有限公司,山西河津043300 [3]大连百合氧枪喷头有限公司,辽宁大连116023

出　　处：《轧钢》2023年第6期138-141,共4页Steel Rolling

摘　　要：采用直接轧制工艺生产棒线材具有节约能源消耗、降低金属损耗、减少废气排放、降低生产成本、提高市场竞争力等优势,但直轧工艺对铸坯温度有较高的要求。为此,研究了小方坯连铸技术对铸坯温度的影响及实际应用效果。实践表明:在小方坯连铸高效结晶器技术开发的基础上,通过采用提高拉速、输送辊道增加保温罩、输送辊道提速、减弱二冷区水冷强度等措施,在保证连铸坯表面质量及内在质量的同时,有效提高了铸坯温度;当拉速由3 m/min提高到4.2 m/min,铸坯整体温度可提高约50℃;在铸坯切割前辊道上增加保温罩,铸坯整体温度可提高约40℃;当拉坯速度在3.15 m/min时,减弱二冷区水冷强度,比水量由1.2 L/kg降为0.7 L/kg,可使铸坯整体温度可提高约60℃。通过一系列措施的实施,满足了铸坯直轧对连铸生产铸坯质量和温度的要求,达到了优化工艺流程、节能减排的目的。The use of direct rolling technology to produce bars and wires has advantages such as saving energy,reducing metal loss,reducing exhaust emissions,reducing production costs and improving market competitiveness.However,the direct rolling process has high requirements for the temperature of the casting billet.Therefore,the influence of billet continuous casting technology on billet temperature and its practical application effect were studied.The practice shows that the temperature of the continuous casting billet is effectively improved based on the development of high effective mold technology for billet continuous casting,and the measures such as increasing casting speed,adding insulation cover on the conveyor roller,increasing conveyor roller speed and weakening secondary cooling zone water amount.At the same time,the surface and internal quality of continuous casting billets were guaranteed.When the casting speed is increased from 3 m/min to 4.2 m/min,the overall temperature of the billet can be increased by about 50℃.Adding an insulation cover on the roller table before cutting can increase the overall temperature of the casting billet by about 40℃.When the casting speed is 3.15 m/min,the secondary cooling zone water amount is weakened,and the specific watervolume is reduced from 1.2 L/kg to 0.7 L/kg,which can increase the overall temperature of the casting billet by about 60℃.Through the implementation of a series of measures,the requirements of the quality and temperature of continuous casting billets for direct rolling have been met,and the goal of optimizing the process for energy saving and emission reduction has been achieved.

关 键 词：棒线材 直接轧制 小方坯 高拉速连铸 高效结晶器 保温罩 二冷区水冷强度 铸坯温度 铸坯质量 节能减排 

分 类 号：TG335.6[金属学及工艺—金属压力加工] TF777.3[冶金工程—钢铁冶金]