摘要
本文建立了描述钢锭冷凝、加热、轧制全过程的数学模型。其特点是建立了凝固率变化和凝固前沿推移的连续模型,考虑了相邻钢锭对辐射传热的遮蔽作用;研究了钢液中的结晶沉降过程;提出并定义了焓平均温度,且将它作为钢锭热状态的判别标志;在加热模型的计算中,由给定热负荷计算温度和由给定温度计算热负荷均获得了收敛的结果。在此基础上,还获得了计算焓平均温度和凝固率的回归公式;作出了多种传搁时间图表;得出了确定最佳入炉焓平均温度和最佳传搁时间的方法。根据本模型能为生产实际制定液芯轧制和加热工艺规程。
Processes of solidification, heating and rolling of ingots have been mathematically mode-lled. A number of the experimental results from both laboratories and factories have shownthat the models are correct and reliable. The continuous models for the change of the solidific-ation ratio and for the moving of the solidification front have been set up. The shieldingeffect between adjacent ingots on radiative heat transfer is allowed for The subsidence proc-esses of crystals within the liquid steel is studied. The calculated temperature from given heatconsumption and the calculated heat capacity from temperature are all convergent and fittedwell to the actual situation. The main conclusions are as follows: The formulae used to ca-lculate the enthalpy-average temperature and solidification ratio are obtained; The track timetables(TTT) have been put forward to compare with the general TTT; The optimal inchargingenthalpy-average temperature is based on the profit of heating ingots; The heating operationprocesses of ingots with liquid core can be worked out etc.
出处
《钢铁》
CAS
CSCD
北大核心
1989年第5期62-67,61,共7页
Iron and Steel
