發(fā)布時間：2018-02-16 14:23

  本文關鍵詞： 熱軋帶鋼 氧化鐵皮 氧化動力學 酸洗　出處：《哈爾濱工業(yè)大學》2017年碩士論文　論文類型：學位論文

【摘要】：熱軋是鋼板生產的關鍵工藝之一,熱軋鋼板的表面質量控制非常重要,但其影響因素有很多,例如細孔,翹皮,表面劃傷,以及氧化鐵皮等等。在這些因素中,針對于熱軋帶鋼的表面質量控制,熱軋帶鋼表面的氧化鐵皮的壓入與細孔是其難點和重點。氧化鐵皮不僅影響帶鋼產品的整體表面質量和除鱗效果,還會影響如涂飾和抗腐蝕性能等表面處理機制,同時氧化鐵皮也會對冷軋產品的性能造成影響。在本文中,將對于熱軋鋼板的表面氧化鐵皮進行研究,包括其特征以及控制技術,這些都有著重要的理論和現(xiàn)實方面的意義。首先,選擇了三種不同的熱軋鋼并對其進行了相關的氧化動力學實驗,完成了實驗設計和實驗結果分析。通過三種不同的熱軋鋼的相關的氧化動力學實驗可以得知:首先,當氧化時間相同時,隨著氧化動力學實驗采用的氧化溫度的不斷提高,對于三種不同的熱軋鋼,各自由于氧化而增加的重量都在不斷地增長;其次,當氧化溫度恒定時,隨著氧化動力學實驗采用的氧化時間的不斷延長,對于三種不同的熱軋鋼,各自由于氧化而增加的重量都在不斷地增長;同時,在本文的氧化動力學實驗中,在不同的氧化時間和氧化溫度的情況下,三種不同的熱軋鋼由于氧化而增加的重量所對應的曲線保持較高的增長速度。這種情況表明,在本文的氧化動力學實驗中,三種不同的熱軋鋼的表面氧化層都沒有完全將熱軋鋼的基體表面覆蓋。相關實驗結果可以作為實際熱軋過程中帶鋼表面氧化鐵皮的變化規(guī)律建模和分析的參考。其次,研究了在熱軋的過程中,對于三種不同的熱軋鋼,采用不同的熱軋參數(shù)時,熱軋帶鋼表面的氧化鐵皮所具有的特性。通過研究可知,隨著實驗過程中開軋溫度的升高,對于三種參與實驗的熱軋鋼板,它們表面氧化鐵皮的總厚度都有一定程度的增加,Fe_2O_3所占的面積顯著地降低,FeO所占面積顯著地增加,相比較而言,相對而言Fe_3O_4所占面積的變化幅度較小。隨著實驗過程中終軋溫度的提高,熱軋鋼板SS400-Cr的氧化鐵皮總厚度在逐漸提高,并最終趨于平穩(wěn)并保持在一個恒定值上。不斷提高卷取溫度,三種不同的熱軋鋼鋼板表面的氧化鐵皮厚度都是在不斷地增大的,但其變化的速度在不斷地下降。在450℃左右時,三種不同的熱軋鋼鋼板表面的氧化鐵皮總厚度都幾乎不再增大而趨于恒定。最后,研究了酸洗時間的影響因素,包括卷取溫度、鹽酸濃度以及鹽酸溫度。實驗表明,對于所有樣品鋼,卷取溫度為450℃的酸洗時間比卷取溫度為650℃它的酸洗時間要短,說明樣品鋼在650℃時卷取會形成較難酸洗的氧化鐵皮,增加了酸洗的難度,因此需要的酸洗時間更長。當實驗中酸洗的溫度被設定為60℃時,對于三種不同的熱軋鋼,使用15%~18%濃度的酸液,所產生的酸洗效果相對于其他的濃度的酸液要更好。
[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，

本文編號：1515724