Study On The Solidification Heat Transfer Simulation Of The Round Billet Continuous Casting And Its Process Optimization

In the process of oil well pipe steel continuous casting, because of the unreasonable use of technical parameters, it often appears some defects such as center segregation, porosity, shrinkage and the low equiaxed crystal ratio, which caused the sharp decrease of many properties including corrosion resistance. It has not only caused great financial losses to the oilfield, but also it has caused disastrous consequences. This paper studies and discusses the problem of continuous casting round bloom at oil well pipe steel systematically.This paper takes Φ178mm round bloom caster in a certain domestic iron and steel corporation as the object. The study on the characteristics of heat transfer and solidification for Q steel was performed experimentally. The process of heat transfer in course of round billet solidification was simulated by using ProCAST software, the nile was optimized in water distribution, and then the right operating parameters in continuous casting was proposed.This article is based on the method of boundary condition, and a mathematical model for heat transfer in course of round billet solidification was established. Based on the technology on spot, reasonable rational boundary constraint was established. The results indicated that the prediction values are identical with the measurements. Get through theory calculation, it has proved that the liquidus temperature of Q steel is1508℃and the solidus temperature is1429℃. By the differential scanning calorimetry, the liquidus temperature is1505℃and the solidus temperature is1424℃. The error is less than0.35%.By using ProCAST simulation software, Q round billet continuous casting steel solidification heat transfer process is simulated. The results show that in the electromagnetic stirring end location, molten steel superheat increases every10℃,the slab surface temperature increases8℃; Casting speed increase of0.1m/min, the slab surface temperature increases8℃, and in the air cooling section of slab surface temperature is larger; the amount of water ratio increase every0.05L/kg,the slab surface temperature decrease8℃. According to the simulation results of Q steel round billet continuous casting and secondary cooling water distribution system optimization research, under the condition of the constraints satisfy of metallurgical criteria, optimized crystallizer in front of the total quantity is b L/min, the cold period of district water respectively A L/min, B L/min, C L/min, D L/min, the total quantity of261L/min. The optimized crystallizer of total water is1600L/min, secondary cooling period of district water respectively72L/min,96L/min,35L/min,25L/min, the total quantity of228L/min, decreased by12.6%compared with the total water before optimization. Optimization of secondary cooling water distribution system, the terminal location, electromagnetic stirring continuous casting billet solidification fraction from90.7%to75.3%, in line with the solidification theory of continuous casting billet solidification rate from70%to80%at the end of the request.