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2020年線材熱直軋薄帶鋼可行性研究報告DOC

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基本簡介
發藍帶鋼作為一種包裝帶鋼,屬于薄帶鋼的一種,被廣泛應用于鋼材、有色 金屬、輕紡制品、建材等金屬材料的包裝。傳統生產方式采用冷軋或熱軋板帶經 縱剪成型,但剪切后的薄帶鋼邊部易產生毛邊和毛刺等缺陷。與傳統生產發藍帶 鋼的方式不同,利用線材軋制生產薄帶,可以提高產品的邊緣質量,減少邊部毛 刺、裂紋等缺陷。 本文以線材 30MnSi 和 45 鋼為研究對象。對 30MnSi 進行熱模擬實驗,研究 變形溫度和冷卻速度對組織與性能的影響。通過將線材 30MnSi 進行熱軋,探究 不同軋制溫度下的組織與力學性能,最終得到了抗拉強度較高的薄帶鋼。對 45 鋼進行熱軋實驗,分別對 Ф16、Ф18、Ф20 mm 的 45 鋼進行熱軋,用 Ф16 mm 的 45 鋼能夠獲得常用的 32 mm 尺寸的薄帶鋼。對軋后薄帶鋼力學性能均勻性進 行判斷及此軋制方法下邊部組織情況進行觀察。 主要研究結果如下, (1)在 THERMECMASTOR 熱模擬試驗機上,通過熱模擬壓縮試驗,確定壓 縮溫度及冷卻速度對 30MnSi 組織與性能的影響。發現變形溫度越低,冷卻速度 越快,組織和性能越好。單道次壓縮下,600℃水冷方式,維氏硬度達到 195 HV, 對應抗拉強度 625 MPa。雙道次壓縮,冷卻速度在 20℃/s 時,維氏硬度達到 247 HV,對應抗拉強度 785 MPa; (2)在中厚板軋機上,對 30MnSi 鋼進行熱軋實驗,研究軋制溫度對組織和性 能的影響。其中軋制溫度越低,得到的力學性能越好,在 650℃水冷條件下,抗 拉強度達到 918 MPa。軋制溫度越高,斷后伸長率越好,950℃水冷,斷后伸長 率達到 18.8%。這種方法生產薄帶鋼,可以減少產品工藝流程,提高產品邊緣質 量,降低產品缺陷; (3)對 45 鋼進行熱軋實驗,不同尺寸線材的熱軋實驗表明,軋后試樣的寬厚 比不同,Ф16 mm 的線材可以生產常用 32 mm 寬的發藍帶鋼。邊部和中心部力 學性能基本一致,邊部組織和三維立體組織沒有發現裂紋; (4)線材熱直軋薄帶鋼方法可行,簡化工藝流程,提高產品質量。 關鍵詞,線材;30MnSi;薄帶鋼;熱模擬;力學性能iii ABSTRACT As a kind of packaging strip, the blue strip steel is a kind of thin strip steel, which is widely used in the packaging of metal materials such as steel, non-ferrous metals, light textile products and building materials. The traditional production method uses cold-rolled or hot-rolled strips through slitting, but the edges of the thin strip after shearing are prone to defects such as burrs and burrs. Different from the traditional way of producing blue ribbon steel, the use of wire rod rolling to produce thin strips can improve the edge quality of the products and reduce defects such as edge burrs and cracks. In this paper, the wire 30MnSi and 45-steel are the research objects. Thermal simulation experiments were carried out on 30MnSi to study the effects of deformation temperature and cooling rate on microstructure and properties. By hot rolling the wire 30MnSi, the microstructure and mechanical properties at different rolling temperatures were investigated, and a thin strip with higher tensile strength was finally obtained. For the 45-steel hot-rolling experiment, 45 steels of Ф16, Ф18, and Ф20 mm were hot-rolled, and a thin strip of 32 mm was obtained with 45 steel of Ф16 mm. The uniformity of mechanical properties of the strip steel after rolling was judged and the edge structure of the rolling method was observed. The main findings are as follows: (1) On the THERMECMASTOR thermal simulation tester, the effects of compression temperature and cooling rate on the microstructure and properties of 30MnSi were determined by thermal simulation compression test. It is found that the lower the deformation temperature, the faster the cooling rate, and the better the structure and performance. Under single pass compression, 600°C water cooling, Vickers hardness of 195 HV, corresponding to tensile strength of 625 MPa. Double pass compression, with a cooling rate of 20°C/s, Vickers hardness of 247 HV, corresponding to a tensile strength of 785 MPa; (2) On the plate mill, hot rolling experiments were carried out on 30MnSi steel to study the effect of rolling temperature on microstructure and properties. The lower the rolling temperature, the better the mechanical properties obtained. Under the water cooling condition of 650 °C, the tensile strength reaches 918 MPa. The higher the rolling temperature, the better the elongation after breaking, the water cooling at 950°C, and the elongation after breaking reached 18.8%. This method of producing thin strip steel can reduce the product process, improve the edge quality of the product,iv and reduce product defects; (3) Hot-rolling experiments on 45 steel, hot-rolling experiments of different size wires show that the width-thickness ratio of the samples after rolling is different, and the wire of Ф16 mm can produce the common blue-belt strip with a width of 32 mm. The mechanical properties of the edge and the center were basically the same, and no cracks were found in the edge and three-dimensional structures; (4) The method of hot strip rolling of strip steel is feasible, simplifying the process and improving product quality. Key Words: wire rod, 30MnSi, Thin strip steel, thermal simulation, mechanical properties目錄 獨創性聲明.....................................................................................................................i 關于報告使用授權的說明.............................................................................................i 中 文 摘要..................................................................................................................ii ABSTRACT..................................................................................................................iii 1 緒論............................................................................................................................1 1.1 引言..................................................................................................................1 1.2 線材和帶鋼的用途和分類..............................................................................1 1.2.1 線材的用途和分類................................................................................1 1.2.2 帶鋼的用途和分類................................................................................2 1.3 線材熱直軋薄帶鋼研究現狀..........................................................................3 1.3.1 熱軋方法................................................................................................3 1.3.2 線材軋扁工藝........................................................................................3 1.3.3 線材 30MnSi 其他學者研究方法.........................................................5 1.4 提高薄帶鋼組織與性能的工藝方法..............................................................6 1.4.1 控軋控冷工藝........................................................................................6 1.4.2 熱處理工藝............................................................................................7 1.5 研究目的和主要內容......................................................................................8 1.5.1 課題研究的目的和意義........................................................................8 1.5.2 研究的主要內容....................................................................................8 2 30MnSi 熱模擬實驗.................................................................................................10 2.1 熱模擬技術的簡介.........................................................................................10 2.1.1 熱模擬技術..........................................................................................10 2.1.2 THERMECMASTOR 熱模擬試驗機..................................................10 2.1.3 THERMECMASTOR 的應用..............................................................11 2.1.4 熱模擬實驗的優點..............................................................................11 2.1.5 熱模擬實驗目的..................................................................................12 2.2 實驗材料及設備.............................................................................................12 2.2.1 實驗原料的尺寸及其化學成分..........................................................12 2.2.2 熱模擬實驗設備..................................................................................13 2.3 熱模擬實驗方案以及加熱制度....................................................................13 2.3.1 單道次壓縮..........................................................................................13 2.3.2 雙道次壓縮..........................................................................................14 2.4 力學性能檢測................................................................................................15 2.4.1 單道次壓縮結果..................................................................................15 2.4.2 雙道次壓縮結果..................................................................................18 2.5 載荷-位移曲線..............................................................................................20 2.5.1 單道次壓縮載荷-位移曲線................................................................20 2.5.2 雙道次壓縮載荷-位移曲線................................................................22 2.6 顯微組織觀察................................................................................................22 2.6.1 單道次壓縮..........................................................................................23 2.6.2 雙道次壓縮..........................................................................................24 2.7 熱模擬實際壓縮量........................................................................................252.7.1 單道次變形..........................................................................................25 2.7.2 雙道次變形..........................................................................................26 2.8 本章小結........................................................................................................26 3 30MnSi 熱軋薄帶實驗.............................................................................................28 3.1 發藍帶鋼簡介................................................................................................28 3.2 實驗設備與材料............................................................................................30 3.2.1 實驗設備..............................................................................................30 3.2.2 實驗材料..............................................................................................30 3.3 壓下規程及軋制實驗測量數據....................................................................30 3.3.1 壓下規程..............................................................................................30 3.3.2 軋制實驗測量數據..............................................................................31 3.4 力學性能檢測................................................................................................32 3.4.1 拉伸實驗儀器設備..............................................................................32 3.4.2 試件的制備..........................................................................................33 3.4.3 性能檢測..............................................................................................33 3.5 顯微金相組織................................................................................................36 3.6 軋后試件平直度與邊部情況........................................................................37 3.6.1 軋后試件...............................................................................................37 3.6.2 邊部情況..............................................................................................39 3.7 本章小結........................................................................................................39 4 線材 45 鋼熱軋薄帶實驗........................................................................................40 4.1 實驗材料及設備............................................................................................40 4.2 實驗方法........................................................................................................40 4.3 實驗結果及分析............................................................................................40 4.3.1 寬展結果..............................................................................................41 4.3.2 力學性能結果......................................................................................41 4.3.3 邊部二維顯微情況..............................................................................45 4.3.4 邊部三維顯微組織..............................................................................45 4.4 本章小結........................................................................................................46 5 結論..........................................................................................................................48 6 展望..........................................................................................................................49

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