热轧带钢氧化铁皮性质影响因素的研究

发布时间：2018-02-16 14:23

  本文关键词： 热轧带钢 氧化铁皮 氧化动力学 酸洗　出处：《哈尔滨工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：热轧是钢板生产的关键工艺之一,热轧钢板的表面质量控制非常重要,但其影响因素有很多,例如细孔,翘皮,表面划伤,以及氧化铁皮等等。在这些因素中,针对于热轧带钢的表面质量控制,热轧带钢表面的氧化铁皮的压入与细孔是其难点和重点。氧化铁皮不仅影响带钢产品的整体表面质量和除鳞效果,还会影响如涂饰和抗腐蚀性能等表面处理机制,同时氧化铁皮也会对冷轧产品的性能造成影响。在本文中,将对于热轧钢板的表面氧化铁皮进行研究,包括其特征以及控制技术,这些都有着重要的理论和现实方面的意义。首先,选择了三种不同的热轧钢并对其进行了相关的氧化动力学实验,完成了实验设计和实验结果分析。通过三种不同的热轧钢的相关的氧化动力学实验可以得知:首先,当氧化时间相同时,随着氧化动力学实验采用的氧化温度的不断提高,对于三种不同的热轧钢,各自由于氧化而增加的重量都在不断地增长;其次,当氧化温度恒定时,随着氧化动力学实验采用的氧化时间的不断延长,对于三种不同的热轧钢,各自由于氧化而增加的重量都在不断地增长;同时,在本文的氧化动力学实验中,在不同的氧化时间和氧化温度的情况下,三种不同的热轧钢由于氧化而增加的重量所对应的曲线保持较高的增长速度。这种情况表明,在本文的氧化动力学实验中,三种不同的热轧钢的表面氧化层都没有完全将热轧钢的基体表面覆盖。相关实验结果可以作为实际热轧过程中带钢表面氧化铁皮的变化规律建模和分析的参考。其次,研究了在热轧的过程中,对于三种不同的热轧钢,采用不同的热轧参数时,热轧带钢表面的氧化铁皮所具有的特性。通过研究可知,随着实验过程中开轧温度的升高,对于三种参与实验的热轧钢板,它们表面氧化铁皮的总厚度都有一定程度的增加,Fe_2O_3所占的面积显著地降低,FeO所占面积显著地增加,相比较而言,相对而言Fe_3O_4所占面积的变化幅度较小。随着实验过程中终轧温度的提高,热轧钢板SS400-Cr的氧化铁皮总厚度在逐渐提高,并最终趋于平稳并保持在一个恒定值上。不断提高卷取温度,三种不同的热轧钢钢板表面的氧化铁皮厚度都是在不断地增大的,但其变化的速度在不断地下降。在450℃左右时,三种不同的热轧钢钢板表面的氧化铁皮总厚度都几乎不再增大而趋于恒定。最后,研究了酸洗时间的影响因素,包括卷取温度、盐酸浓度以及盐酸温度。实验表明,对于所有样品钢,卷取温度为450℃的酸洗时间比卷取温度为650℃它的酸洗时间要短,说明样品钢在650℃时卷取会形成较难酸洗的氧化铁皮,增加了酸洗的难度,因此需要的酸洗时间更长。当实验中酸洗的温度被设定为60℃时,对于三种不同的热轧钢,使用15%~18%浓度的酸液,所产生的酸洗效果相对于其他的浓度的酸液要更好。
[Abstract]:Hot rolling is one of the key processes in the production of steel plate. Surface quality control of hot rolled steel plate is very important, but there are many factors affecting it, such as fine hole, warping skin, surface scratch, oxide iron sheet, etc. Among these factors, In view of the surface quality control of hot rolled strip, it is difficult and important to press and fine hole into the surface of hot rolled strip, which not only affects the overall surface quality and descaling effect of hot rolled strip, but also affects the surface quality of hot rolled strip. It will also affect the surface treatment mechanism such as coating and corrosion resistance, at the same time, the iron oxide will also affect the performance of cold-rolled products. In this paper, the surface of hot rolled steel plate oxide iron sheet will be studied. All of these have important theoretical and practical significance. Firstly, three different kinds of hot rolled steel are selected and their oxidation kinetics experiments are carried out. The experimental design and the analysis of the experimental results have been completed. Through three kinds of related oxidation kinetics experiments of hot rolled steel, it can be known that: first, when the oxidation time is the same, the oxidation temperature increases with the increase of oxidation kinetics experiment. For three different types of hot rolled steel, the weight added by oxidation is increasing continuously. Secondly, when the oxidation temperature is constant, with the continuous prolongation of oxidation time used in oxidation kinetics experiment, for three different hot rolled steels, At the same time, in the experiments of oxidation kinetics in this paper, under different oxidation time and temperature, The curve corresponding to the weight increase due to oxidation of three different hot rolled steels keeps a high growth rate. This situation shows that in the oxidation kinetic experiment in this paper, The surface oxidation layer of three kinds of hot rolled steel does not completely cover the substrate surface of hot rolled steel. The related experimental results can be used as a reference for modeling and analyzing the variation law of oxidized iron sheet on the surface of hot rolled steel strip during the process of actual hot rolling. Secondly, The characteristics of the oxidized iron sheet on the surface of hot rolled strip with different hot rolling parameters for three different hot rolled steels during hot rolling are studied. The results show that the open rolling temperature increases with the increase of the open rolling temperature of the hot rolled strip during the process of hot rolling. For the three kinds of hot rolled steel sheets, the total thickness of iron oxide on their surface increased to a certain extent, and the area occupied by Fe2O3 significantly decreased, and the area of Feo increased significantly, compared with the total thickness of the iron oxide sheet on the surface of the three kinds of hot rolled steel plates, and the total thickness of the oxidized iron sheet on the surface increased to a certain extent. The change of Fe_3O_4 area is relatively small. With the increase of final rolling temperature, the total thickness of SS400-Cr oxide sheet of hot rolled steel plate is gradually increasing. Finally, it tends to be stable and keeps at a constant value. With increasing the coiling temperature, the thickness of the oxide sheet on the surface of three different hot rolled steel sheets is constantly increasing, but the speed of change is continuously decreasing. At about 450 鈩，

本文编号：1515724