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为了制定合理的连铸工艺,减少连铸坯边裂缺陷的发生,分别采用热膨胀分析仪和同步热分析仪测试了0Cr13铁素体不锈钢连铸坯的高温性能,并对其在950～1300℃的相变行为进行了研究。热膨胀分析表明,0Cr13不锈钢从室温到1200℃升温过程中热膨胀曲线是非线性的;DSC分析表明,0Cr13不锈钢在849～890℃存在一明显的晶型转变;高温相变研究表明,0Cr13不锈钢在950℃的高温组织基本为奥氏体;当温度大于1150℃时高温奥氏体含量迅速减少,1300℃时基体组织基本为铁素体。根据研究结果可确定0Cr13不锈钢二冷区温度应大于910℃,最佳轧制温度为950～1050℃。
In order to develop a reasonable continuous casting process and reduce the occurrence of edge splitting defects in continuous casting slabs, the high temperature performance of 0Cr13 ferritic stainless steel continuous casting slabs was tested by thermal expansion analyzer and synchronous thermal analyzer respectively. The phase transition behavior was studied. The thermal expansion analysis shows that the thermal expansion curve of 0Cr13 stainless steel is non-linear from room temperature to 1200 ℃. DSC analysis shows that there is a clear crystal transition of 0Cr13 stainless steel from 849 ℃ to 890 ℃. The phase transition of 0Cr13 stainless steel at 950 ℃ The microstructure of high temperature austenite is basically austenite. When the temperature is higher than 1150 ℃, the austenite content decreases rapidly. At 1300 ℃, the matrix structure is basically ferrite. According to the research results, the temperature of secondary cooling zone of 0Cr13 stainless steel should be more than 910 ℃ and the optimum rolling temperature is 950 ~ 1050 ℃.