Study On High Temperature Thermoplastic Property And Optimization Water-cooling Technology Of75Cr1Sheet Billet

Abstract:Compared with ordinary steel, the high carbon slab more prone to some problems such as shrinkage, segregation, defects, cracks and smash-slab because of containing higher carbon. The thermal simulation experiment about high-carbon sheet billet was carried out, and the high temperature thermoplastic can be abtained. Itis very important to produce cast slab with stability of antegrade, low cost and high efficiency by developing and amending casting cooling technology and technological parameter on CSP.The papers take75Cr1slab as object, investigate the parameter and quality control technology of high-carbon sheet billet on CSP. According to technological conditions of CSP, the experiment of evaluating and simulating high temperature thermal project was carried out. Research on high temperature thermoplastic of it from600to1400℃, the high temperature brittleness range of high-carbon slab was confirmed and its designated-temperature curve on surface was developed. Meeting temperature curve and metallurgical standards under the conditions, The papers draw lessons from static control of casting water, and make sure the casting water system of high-carbon slab. The temperature of slab and new casting-water in conticaster by the mathematical Model of solidification and heat-transferation was acchived. and the linear regression of casting water and casting speed was calculate, The paper optimiza the cooling water.Considering the problem that change rate of temperature and strain impact on high temperature thermoplastic, The papers test high temperature thermoplastic. Combining one-dimensional mathematical model of heat-transferation with MATLAB, the papers calculate water meter of crystallizer and secondary cooling zone out of line, the optimization of the cooling water become more simply, efficient and visually.The study show:setting cooling rate as3℃/s,mould strain rate as10.64×10-2and strain rate as1.3×10-3, the Low-temperature Brittleness zones of75Cr1mostly dominated by intergranular from700to950℃, the high-temperature ductility zones of75Cr1mostly dominated by transgranular from950to1250℃, the high-temperature Brittleness zones mostly dominated along solid-liquid phase from1250to melting point. The deviation of measurement temperature and simulation temperature on slab control within range0.93to1.93%, after optimizating casting water, the cooling of slab become more homogeneity, inclusion in slab reduce and microstructure of billet improve.