轧制变形对重轨脱碳深度的影响

Effect of Rolling Deformation on Depth of Decarburized Layer of Heavy Rail

钢厂轧制U75V钢(%:0.71～0.80C、0.50～0.80Si、0.70～1.05Mn、0.04～0.12V、0.23Cu)60 kg/m重轨的铸坯尺寸为380 mm×280 mm,经第2架粗轧后坯料的断面面积为18 015 mm^2。通过轧制变形试验和显微镜观察测试,结合生产现场技术参数建立了有限元模型,以研究分析轧制变形对脱碳层影响。得出经第1粗轧机架和第2粗轧机架孔型轧制后,轨头脱碳层从1.2mm降至0.53 mm,轨腰脱碳层从1.5 mm降至0.54 mm,轨底脱碳层从1.5 mm降至0.83 mm。实测成品轨头的脱碳层为0.2 mm。

The section size of casting bloom to roll 60 kg/m heavy rail of steel U75V（%：0.71～0.80C,0.50～0.80Si,0.70～1.05Mn,0.04～0.12V,0.23Cu） is 380 mm×280 mm and the section area of rolled piece out of second stand rougher mill is 18 015 mm^2.A finite element model is established by rolling deformation test and microscopic observation and measure combining with technical parameters at production situs to study and analyze the effect of rolling deformation on depth of decarburized layer of heavy rail.It is obtained that as the bloom is rolled by primary stand mill and second stand rougher mill,decarburized layer of rail head decreases to 0.53 mm from 1.2 mm,decarburized layer of rail waist decreases to 0.54 mm from 1.5 mm and decarburized layer of rail bottom decreases to 0.83 mm from 1.5 mm.The measured decarburized layer of finished rail head is 0.2 mm.