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采用Gleeble-3500热模拟机研究了集装箱板的高温热塑性,对连铸过程中的锥度、热流密度、窄宽面热流比、保护渣以及轧制工艺进行优化。结果表明:集装箱板钢液浇注过程中矫直温度设在900℃以上,拉速控制在4.0~4.3 m/min,二冷阶段采用弱冷模式。当锥度控制在1.45~1.63%/m,宽面热流在1 800~2 200 k W/m2,窄宽面热流比为70%~85%,保护渣碱度为1.13时,热流最稳定且板材冷齿发生率最低;采用前段层冷控制模式,F4轧制力控制在1 100~1 300 t,F5轧制力控制在900~1 000 t;RDT温度控制在1 070~1 120℃,粗轧前除鳞压力调整为32 MPa,精轧前除鳞压力调整为34 MPa。工艺优化后的集装箱板平均屈服强度为438 MPa、平均抗拉强度为519 MPa,平均伸长率为35.9%。
The Gleeble-3500 thermal simulator was used to study the high temperature thermoplasticity of the container board. The conicity, heat flux, narrow-surface heat flux ratio, mold flux and the rolling process in the continuous casting process were optimized. The results show that the straightening temperature is above 900 ℃ and the pulling speed is controlled at 4.0 ~ 4.3 m / min during the pouring process of container steel, and the weak cooling mode is adopted during the second cooling stage. When the taper is controlled at 1.45 ~ 1.63% / m, the width of the heat flux is in the range of 1 800 ~ 2 200 k W / m2, the heat flux of the narrow facets is 70% ~ 85% and the basicity of the slag is 1.13, The cold tooth rate is the lowest. With the former cooling control mode, the rolling force of F4 is controlled at 1 100 ~ 1 300 t and the rolling force of F5 is controlled at 900 ~ 1 000 t. The RDT temperature is controlled at 1 070 ~ 1 120 ℃ The descaling pressure before rolling is adjusted to 32 MPa and the descaling pressure before finishing rolling is adjusted to 34 MPa. After optimization, the average yield strength of container board is 438 MPa, the average tensile strength is 519 MPa and the average elongation is 35.9%.