本文關(guān)鍵詞： 鍍錫基板 夾雜物 上浮 潤濕性能 卷渣　出處：《北京科技大學(xué)》2017年博士論文　論文類型：學(xué)位論文

【摘要】：高品質(zhì)鍍錫板在材料強度、硬度、伸長率、塑性應(yīng)變比等力學(xué)性能和潔凈度方面要求十分嚴(yán)格,而基板中夾雜物控制成為制約高品質(zhì)鍍錫基板生產(chǎn)的重要環(huán)節(jié)。圍繞鍍錫基板夾雜物演變行為,本文開展一系列基礎(chǔ)研究工作,并將研究成果應(yīng)用于某公司鍍錫基板生產(chǎn)線,為進(jìn)一步提高鍍錫基板品質(zhì)提供理論依據(jù)。本文主要內(nèi)容如下:(1)從熱力學(xué)角度,對精煉及軋制過程的夾雜物演變規(guī)律進(jìn)行系統(tǒng)研究。在此基礎(chǔ)上提出了精煉、連鑄過程夾雜物演變機制;分析了軋制過程中夾雜物的成分及形貌,提出了鍍錫板軋制過程夾雜物的變形機制。(2)基于LF精煉過程中鋼液、鋼渣及耐火材料的相互作用,建立了鋼液/鋼渣/夾雜物傳質(zhì)動力學(xué)模型,計算結(jié)果與工業(yè)取樣結(jié)果吻合。靜吹4min時,夾雜物平均成分不能進(jìn)入低熔點區(qū)域,靜吹時間提高到8min,平均成分進(jìn)入低熔點區(qū)域。通過計算及工業(yè)取樣驗證表明,鋼液中來自于耐材侵蝕的Mg量占鋼液中總Mg量的82.9%,耐材侵蝕為鋼液中Mg的主要來源。(3)采用液態(tài)石蠟?zāi)M鋼中液態(tài)夾雜物上浮,并對液態(tài)夾雜物在上浮過程中的碰撞及在渣鋼界面處的行為進(jìn)行了研究。在體系潤濕性一定的前提下,低黏度渣有利于夾雜物的穿過界面。采用物理模擬的方法研究了潤濕性能對夾雜物上浮速度的影響。Re1時,潤濕性能對粒子上浮勻速速度有顯著影響,粒子與水非潤濕條件下,阻力系數(shù)降低;Re500時,潤濕性能對粒子上浮勻速速度無明顯影響。非潤濕性夾雜物較潤濕性夾雜物在中間包內(nèi)有更高的去除率。液態(tài)鈣鋁酸鹽夾雜物在鋼液中碰撞后發(fā)生完全熔合,形貌為球狀;CaS與高熔點鈣鋁酸鹽夾雜物之間未發(fā)生熔合,呈串狀粘附,這也阻礙了鈣鋁酸鹽的進(jìn)一步變性。(4)研究了結(jié)晶器內(nèi)鋼液卷渣機制,分析了影響卷渣的因素,基于量綱分析原理,對P]V測得的卷渣速度數(shù)據(jù)進(jìn)行擬合,得到了臨界卷渣速度公式。研究了非牛頓流體保護(hù)渣抑制卷渣與潤滑性協(xié)調(diào)機理,設(shè)計了高拉速新型水口,提出了水口結(jié)構(gòu)評價指數(shù)。
[Abstract]:The mechanical properties and cleanliness of high quality tinplate are very strict in terms of material strength, hardness, elongation, plastic strain ratio, etc. However, the control of inclusions in the substrate becomes an important link to restrict the production of high quality tin plated substrates. A series of basic research work has been carried out around the evolution behavior of the inclusions in the tin plated substrates, and the research results have been applied to the tin plating substrate production line of a company. In order to provide theoretical basis for further improving the quality of tin plated substrate, the main contents of this paper are as follows: 1) from the point of view of thermodynamics, the evolution of inclusions in refining and rolling process is systematically studied. The evolution mechanism of inclusions during continuous casting, the composition and morphology of inclusions in rolling process are analyzed, and the deformation mechanism of inclusions in tinplate rolling process is put forward, which is based on the interaction of molten steel, slag and refractories during LF refining. A mass transfer kinetic model of molten steel / slag / inclusions was established. The calculated results were in agreement with the results of industrial sampling. The average composition of inclusions could not enter the low melting point region after static blowing for 4 min. When the static blowing time is increased to 8 min, the average composition enters the low melting point region. The results of calculation and industrial sampling show that, In molten steel, the amount of mg from corrosion of refractory material accounts for 82.9% of the total amount of mg in molten steel, and corrosion of refractory material is the main source of mg in liquid steel.) liquid paraffin wax is used to simulate the floating of liquid inclusions in steel. The collision of liquid inclusions in the floating process and the behavior at the interface of slag and steel were studied. The effect of wettability on the floating velocity of inclusions was studied by physical simulation. When the resistance coefficient is reduced by Re500, The wettability has no obvious effect on the uniform velocity of particle floating. The non-wettable inclusions have a higher removal rate than the wettable inclusions in the tundish. The morphology shows that there is no fusion between spherical cas and high melting point Calcium-aluminate inclusions, which also hinders the further denaturation of calcium aluminate. (4) the mechanism of molten steel coiled slag in the mold is studied, and the factors influencing the slag winding are analyzed. Based on the dimensionality analysis principle, the critical slag velocity formula was obtained by fitting the data of slag volume velocity measured by P] V. the coordination mechanism between the inhibition of slag volume and lubricity of non-Newtonian fluid mold flux was studied, and a new type of nozzle with high drawing speed was designed. The evaluation index of nozzle structure is put forward.
【學(xué)位授予單位】：北京科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TF76;TG335.5

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