1330559 玖、發明說明： I：發明所屬之技術領域3 發明領域 本發明係有關在雙滚輪壓鑄機中來鑄造鋼條的技術。 5 【先前技術】 發明背景 在雙滾輪壓鑄機中熔融金屬會被注入一對反向旋轉的 水平壓鑄滾輪之間，該等滾輪是被冷却的，因此金屬外殼 會在移動的滚輪表面上凝固，並會在它們之間的軋口處軋 10 合在一起來形成一固化的條帶成品，而由該二滾輪之間的 軋口往下輸送。於此所述的“軋口”（“nip”)係指該二滾輪 互相最接近的區域。該溶融金屬會由一洗桶倒入一較小的 容器中，再由該容器内流經一位於該軋口上方的金屬輸送 管嘴來導入該二滚輪之間的軋口中，而形成一熔融金屬的 15 鑄漿被撐持在該軋口正上方的滾輪壓鑄面上，並沿該等滾 輪的長度延伸。該鑄漿通常會被圍限於能與該等滾輪端面 滑動抵接的側板或阻堤之間，而來防止該鑄漿的兩端向外 流出，惟其它可用的裝置例如電磁阻障亦曾被提供。 當在一雙滾輪壓鑄機中來鑄造鋼條時，通常該鑄漿的 20 溫度會超過1550°C，但必須使該熔融金屬非常快速且均勻 地冷却而來通過該等滾輪的壓鑄表面，俾能在該等壓鑄滾 輪的每一迴轉中，使該壓鑄表面上的每一點可在曝露於熔 聚的極短時間内來將之固化。如在No.5720336美國專利中 所揭，在固化時的熱通量會受沈積在軋輪表面上之金屬氧 5 1330559 化物的特性嚴重地影響，該等金屬氧化物係由該壓绩過程 中產生於鑄漿上的鋼渣所形成者。具言之，若該沈積在壓 鎮表面上的金屬氧化物於鱗造溫度時係呈液態，則將可確 使該各壓鑄表面皆能被一層材料所覆蓋，其在鋼的固化溫 5度係至少部份地呈液指’故在固化時的熱通量將會大為力。 . 強。該等氧化物會與鋼-起固化而在鋼條中形成氧化包容 - 物’但最重要的是它們必須要能在該鋼的開始 · 固化溫度保持液態，以免在該鋼固化之前呈固體顆嶋 · 在該等壓鑄表面上，而抑制了該溶融鋼料的熱傳導。 # ίο 【發明内容】 發明概要 依據在幻袞輪壓鱗機中來鑄造低碳鋼條的經驗，並 77析在鑄以不同成刀之鋼時的氧化包容物我們已發現該 等壓鑄表面的熱通量會受到二源頭造成的包容物炼點之規 15制’即⑷當壓鑄表面上的鋼開始固化時於其曲面處固化户斤 W成者及(b)在細叫液態鋼去氧化時所造成者。 举當鋼條在軋輪上固化時，其固化包容物會偈限於該條 φ #的表面上。相反地，在糾㈣成的找化包容物則會 遍佈該條帶，且顯著地比該等固化包容物更粗些。該兩^ 2〇包容物的來源對.鋼條的檮造十分重要而為能有較佳料 - ^ '牛I玄一來源所造成的包容物之炫點應較低為宜。 ，- 在Ν〇.5720336美國專利中的揭露僅有關於當固化時所 廣生的包容物。在該揭露中認為存在於鋼逢内的Μ处是必 '然有害的’故應儘量減少或以贼理來消除。但是’我們 6 7已發現’在去氧化包容物巾存有受控量的Ah〇3將會甚有 利於在鑄造過程中確使該等包容物保持熔化直到周圍的鋼 熔料已先固化。使用錳/矽來除氧的鋼，其包容物的熔點 對氧化猛與氧化石夕的比率變化非常敏感’而針對某些該等 比率’該等包容物的熔點會相當高，例如大於1700。〇，此 將會抑止一適當的液膜生成於該軋輪表面上，並會阻礙該 熔鋼傳輸系統中的流路。在去氧化包容物中適當地產生 Al2〇3 ’而來製成一包含MnO，Si02及AI2〇3的三相氧化物系 統，將能減低該包容物熔點對MnO/Si02比率變化的敏感 性’並可實質地減低該等包容物的熔點。因此本發明乃可 供在一雙滾輪愿鑄機中鑄造低碳鋼，而能生成含有ai2o3的 去氧化包容物者。 依據本發明係在提供一種鑄造低碳鋼條帶的方法，包 含： 組合一對壓鑄滾輪而在其間形成一軋口； 製成一熔化鋼料具有鐵渣、錳、矽及鋁的氧化物等， 其會在一鋼條中形成MrO、Si〇2、Al2〇3等包容物，而 MnO/Si〇2的比率為0.2至1.6，且Al2〇3的含量少於45% ;及 將該熔鋼注入該對滾輪之間來形成一熔鋼鑄漿，而被 樓持在該乳口上方的滾輪塵鑄表面上；及 反向旋轉該二滾輪來製成一固化的鋼條並由該軋口向 下輸送。 在該熔鋼中之包容物的Al2〇3含量係可形成液體包容 物。由該炫鋼所製成之條帶中的Α!2〇3含量係可高達 :9(R-0.2)的最大百分比，其中R為該包容物的Mn〇/si〇2 比率°該條帶的Α12ο3含量係可超出MnC)/Si()2比值範圍的ι〇 至3〇%。該等包容物可含有至少3%的Al2〇3。 ,"亥等包容物可分散遍佈該條帶，而尺寸主要在2至12 微米的範圍内。 *本發明亦提供一小於5mm厚度的鑄造低碳鋼條，其含 有固化的鋼相，及遍佈該條帶的固化Mn〇、Si 容你I i2U3包 ，而Mn〇/Si〇2之比率為〇.2至16，且Αία含量為3至 45%。該去氧化包容物的尺寸可為2至12微米。 一新穎的低碳鋼條可由前述的製造方法來製成。 圖式簡單說明 為能更完整地詮釋本發明，實驗結果的數據將會夂昭 所附圖式來說明，其中： ^1330559 发明, INSTRUCTION DESCRIPTION: I: TECHNICAL FIELD OF THE INVENTION The present invention relates to a technique for casting steel bars in a double roller die casting machine. 5 [Prior Art] BACKGROUND OF THE INVENTION In a two-roller die casting machine, molten metal is injected between a pair of counter-rotating horizontal die-casting rolls that are cooled so that the metal casing solidifies on the moving roller surface. The rolled strips 10 are rolled together at the nip between them to form a cured strip product which is conveyed downward by the nip between the two rollers. As used herein, "nip" ("nip") refers to the area in which the two rollers are closest to each other. The molten metal is poured into a smaller container by a washing tub, and then flows into the rolling port between the two rollers through a metal conveying nozzle located above the rolling port, thereby forming a melting. A metal 15 slurry is supported on the roller die casting surface directly above the roll and extends along the length of the rollers. The casting slurry is usually enclosed between side plates or barrier banks that can abut against the end faces of the rollers to prevent the two ends of the casting slurry from flowing outward, but other available devices such as electromagnetic barriers have also been provide. When casting steel bars in a double roller die casting machine, typically 20 temperatures of the casting slurry will exceed 1550 ° C, but the molten metal must be cooled very quickly and uniformly to pass through the die casting surface of the rollers. At each revolution of the die-casting rolls, each point on the die-cast surface can be cured in a very short time exposed to the melt. As disclosed in U.S. Patent No. 5,720,336, the heat flux at the time of curing is severely affected by the characteristics of the metal oxide 5 1330559 deposited on the surface of the wheel, which is The steel slag produced on the slurry is formed. In other words, if the metal oxide deposited on the surface of the pressed surface is in a liquid state at the temperature of the scale, it will be sure that the surface of each of the die-casting surfaces can be covered by a layer of material, and the solidification temperature of the steel is 5 degrees. It is at least partially liquid-finished, so the heat flux at the time of curing will be greatly increased. Strong. These oxides will solidify with the steel and form an oxidizing inclusion in the steel strip. But most importantly they must be able to remain liquid at the start and cure temperatures of the steel to avoid solid particles before the steel solidifies.嶋· On the die-casting surfaces, the heat conduction of the molten steel is suppressed. # ο [Abstract] Summary of the invention Based on the experience of casting low carbon steel bars in the illusion wheel scaler, and 77 oxidized inclusions when casting steel with different knives, we have found that these die casting surfaces The heat flux will be regulated by the two source heads of the inclusions. That is, (4) when the steel on the die-casting surface begins to solidify, it will solidify on the curved surface and (b) deoxidize in the fine-grained liquid steel. Caused by time. When the steel strip is cured on the rolling wheel, its solidified inclusions are limited to the surface of the strip φ #. Conversely, the corrected inclusions will be spread throughout the strip and will be significantly thicker than the cured contents. The source of the two ^ 2 〇 inclusions is very important for the manufacture of steel bars, and it is better to have a better material - ^ 'The source of the contents of the cattle I Xuanyi should be lower. The disclosure in U.S. Patent No. 5,720,336 is to be incorporated solely to the extent that it is incorporated herein. In the disclosure, it is believed that the defects in the steel are necessarily "harmful" and should be minimized or eliminated by thieves. However, we have found that the presence of a controlled amount of Ah〇3 in the deoxidized containment towel would be beneficial to keep the contents molten during the casting process until the surrounding steel melt has solidified. For steels that use manganese/niobium to deoxidize, the melting point of the inclusions is very sensitive to changes in the ratio of oxidative sensitization to oxidized stone eves. For some of these ratios, the melting point of such inclusions can be quite high, for example greater than 1,700. Oh, this will prevent a suitable liquid film from forming on the surface of the wheel and will impede the flow path in the molten steel transmission system. The proper production of Al2〇3' in the deoxidation inclusions to form a three-phase oxide system comprising MnO, SiO 2 and AI 2 〇 3 will reduce the sensitivity of the inclusion melting point to the change in MnO/SiO 2 ratio. The melting points of the inclusions can be substantially reduced. Therefore, the present invention can be used to cast low carbon steel in a twin roller caster, and to produce a deoxidized inclusion containing ai2o3. According to the present invention, there is provided a method of casting a low carbon steel strip comprising: combining a pair of die casting rolls to form a nip therebetween; forming a molten steel having an oxide of iron slag, manganese, bismuth and aluminum, etc. , which will form inclusions such as MrO, Si〇2, and Al2〇3 in a steel strip, and the ratio of MnO/Si〇2 is 0.2 to 1.6, and the content of Al2〇3 is less than 45%; Steel is injected between the pair of rollers to form a molten steel casting slurry, and is held on the roller dust casting surface above the nipple; and the two rollers are reversely rotated to form a solidified steel strip and rolled by the rolling The mouth is transported downwards. The Al2〇3 content of the inclusions in the molten steel forms a liquid inclusion. The content of Α!2〇3 in the strip made of the sturdy steel can be as high as: the maximum percentage of 9 (R-0.2), where R is the ratio of Mn〇/si〇2 of the inclusion. The Α12ο3 content can exceed Mn〇 to 3〇% of the MnC)/Si()2 ratio range. The inclusions may contain at least 3% Al2〇3. , "Hai and other inclusions can be dispersed throughout the strip, and the size is mainly in the range of 2 to 12 microns. * The present invention also provides a cast low carbon steel strip having a thickness of less than 5 mm, which contains a solidified steel phase, and solidified Mn 〇, Si throughout the strip, and the ratio of Mn 〇 / Si 〇 2 is 〇. 2 to 16, and Αία content is 3 to 45%. The deoxidation inclusions can range in size from 2 to 12 microns. A novel low carbon steel strip can be made by the aforementioned manufacturing method. BRIEF DESCRIPTION OF THE DRAWINGS In order to more fully interpret the present invention, the data of the experimental results will be illustrated by the drawings, where: ^
第1圖為可依本發明來操作之一連續條帶鑄造機 視圖； M 第2圖為第1圖之條帶鑄造機的側視圖； 第3圖為沿第1圖之3_3線的垂直戴面圖； 第4圖為沿第1圖之4-4線的垂直截面圖； 第5圖為沿第1圖之5_5線的垂直截面圖； 第6圖不出MnO/Si〇2比率對包容物熔點的影響； 第7圖不出在鑄造低碳鋼條時對取自一條帶鑄造機之 不同部位的樣品進行包容物分析所得到的Mn〇/Si〇2比率. 第8圖示出添加不同的A12〇3含量對包容物熔點的影 響， 1330559 第9圖示出當鑄造低碳鋼時如何在一安全操作範圍内 來調整ai2o3含量，俾使該等氧化包容物的熔點保持在大約 1580°C的鑄造溫度以下； 第10圖為直徑9.3微米之1^11〇.5丨〇2-八12〇3包容物的顯 5 微照片； 第11圖為直徑5.6微米之]\411〇.5丨02‘八12〇3包容物的顯 微照片； 第12圖為直徑4.1微米之MnO . Si02 · A12o3包容物的顯 微照片； 10 第13圖為第10圖之MnO. Si02. A12o3包容物的X光譜； 第14圖為第11圖之MnO. Si02· A12o3包容物的X光譜； 及 第15圖為第12圖之MnO. Si02· A12o3包容物的X光譜。 C實施方式3 15 較佳實施例之詳細說明 第1至5圖示出一雙滚輪連續條帶壓鑄機，其可依據本 發明來操作。該壓鑄機包含一主機架11可撐立於工場地板 12上。該機架11會撐持一壓鑄滾輪承座13，其係可水平地 在一組合站14與一壓鑄站15之間移動。該承座13裝有一對 20 平行的壓鑄滾輪16，當鑄造操作時，熔融金屬會從一洗桶 17經由漏斗18和輸送管嘴19來供至該二滚輪之間而形成一 鑄漿30。該等壓鑄滾輪16為水冷式，因此料殼會在移動的 滾輪表面16A上固化，並在其間的軋口處被軋合而在滾輪出 口處形成一固化的條帶成品20。此成品會被饋入一標準捲 9 收器21，並可再被轉送至一第二捲收器22。一容器23會被 裝在該機架上鄰近壓鑄站處’而炫融金屬可經由該.漏斗上 之一溢流口 24來流入該容器23内’或將該漏斗一側的緊急 套塞25褪除而來流出，俾當鑄造操作時’若該製品有嚴重 5的瑕疵或其它故障時，可以適當處理。 該滾輪承座13包含一座架31以輪子32安裝在轨道33 上，該等軌道33會沿主機架11的一部份延伸，故該承座13 整體能夠沿該軌道33移動。該座架31設有一對滾輪搖台 34，其中可旋轉地樞裝該等滾輪16。該等搖台34係以互補 1〇 卡合的滑動件35、36來安裝在該承座31上，而使該等搖台 能在液壓缸單元37、38的作用之下於該承座上移動，以調 整壓鑄滚輪16之間的軋口’並在當需要形成一弱化橫線來 橫越該條帶時(如後所詳述）’能使該二滚輪在短時間内迅速 地移開。該承座整體係可藉一雙作用的液壓活塞與缸體單 15元39之運作來沿該軌道33移動，該活塞缸單元39係連結於 該承座13上之一驅動托架4〇和該主機架之間，而可被運作 來將該滾輪承座13移動於該組合站14與壓鎮站15之間。 一電馬達並樞裝在座架31上Figure 1 is a view of a continuous strip casting machine operable in accordance with the present invention; M Figure 2 is a side view of the strip casting machine of Figure 1; Figure 3 is a vertical wear along line 3_3 of Figure 1. Fig. 4 is a vertical sectional view taken along line 4-4 of Fig. 1; Fig. 5 is a vertical sectional view taken along line 5_5 of Fig. 1; Fig. 6 shows the MnO/Si〇2 ratio for inclusion Effect of melting point of the material; Figure 7 shows the Mn〇/Si〇2 ratio obtained by influx analysis of samples taken from different parts of a belt casting machine when casting low carbon steel bars. Figure 8 shows the addition. The effect of different A12〇3 content on the melting point of the inclusions, 1330559 Figure 9 shows how to adjust the ai2o3 content within a safe operating range when casting low carbon steel, so that the melting point of the oxidized contents is maintained at approximately 1580 The casting temperature of °C is below; Figure 10 is a 5 micrograph of the inclusion of 1^11〇.5丨〇2-八12〇3 in diameter 9.3 μm; Figure 11 is the diameter of 5.6 μm]\411〇. Photomicrographs of 5丨02'812〇3 inclusions; Figure 12 is a micrograph of the 4.1 μm diameter MnO. Si02 · A12o3 inclusions; 10 Figure 13 Figure 10 shows the X spectrum of MnO. Si02. A12o3 inclusions; Figure 14 shows the X spectrum of MnO.Si02·A12o3 inclusions in Fig. 11; and Fig. 15 shows the MnO.Si02·A12o3 inclusions in Fig. 12. X spectrum. C EMBODIMENT 3 15 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Figures 1 through 5 illustrate a dual roller continuous strip die casting machine that can be operated in accordance with the present invention. The die casting machine includes a main frame 11 that can be supported on the floor 12 of the worksite. The frame 11 supports a die cast roller shoe 13 which is horizontally movable between a combination station 14 and a die casting station 15. The holder 13 is provided with a pair of 20 parallel die-casting rolls 16 which are supplied from a washing tub 17 through a funnel 18 and a conveying nozzle 19 between the two rollers to form a casting slurry 30 during the casting operation. The die casting rolls 16 are water-cooled so that the shell solidifies on the moving roller surface 16A and is rolled at the nip between them to form a cured strip finished product 20 at the roller exit. The finished product is fed into a standard roll 9 and can be transferred to a second retractor 22. A container 23 will be mounted on the frame adjacent to the die casting station and the glazing metal can flow into the container 23 via one of the overflow ports 24 of the funnel or an emergency plug 25 on the funnel side. Fading out and flowing out, when the casting operation, 'If the product has a serious flaw or other failure, it can be handled properly. The roller shoe 13 includes a frame 31 mounted on the track 33 by wheels 32 which extend along a portion of the main frame 11, so that the socket 13 as a whole can be moved along the track 33. The mount 31 is provided with a pair of roller cradle 34 in which the rollers 16 are rotatably pivoted. The cradle 34 is mounted on the yoke 31 with complementary yokes 35, 36 so that the cradle can be acted upon by the hydraulic cylinder units 37, 38. Moving to adjust the rolling pass between the die casting rollers 16 and when the need to form a weakened transverse line to traverse the strip (as described later) can enable the two rollers to be quickly removed in a short time . The socket is integrally movable along the rail 33 by the operation of a double-acting hydraulic piston and a cylinder unit 15 which is coupled to one of the drive brackets 4 of the socket 13 and Between the main frames, it can be operated to move the roller holder 13 between the combination station 14 and the crushing station 15. An electric motor is pivotally mounted on the mount 31
" '符对盖43來連接於水管42。該滾 該二壓鑄滾輪16會被弓丨自 的驅動軸41反向地樞轉。該_ _" 'Face to cover 43 to connect to the water pipe 42. The two die-casting rollers 16 are pivoted in opposite directions by the drive shaft 41 of the bow. The _ _
2000mm寬的條帶成品。 10 1330559 該澆桶17係完全為傳統結構，而以一叉輕45來樓持在 一懸吊起重器上，使其能由一熱金屬接收站被帶送至—定 位。該澆桶設有一擋止桿46可被一伺服缸所運作，而令炫 融金屬從該洗桶經由一出口 47及耐高溫的圍板48流入該漏 5 斗18内。 該漏斗18亦為習知結構。其係狀似一寬.盤而由耐高溫 的材料例如氧化鎂（Mg〇)所製成。該漏斗的一側可由該澆桶 承接熔融金屬’並設有前述的溢流口 24與緊急套塞25。节 漏斗18的另一側設有一系列縱向間隔分開的金屬排出孔 10 52。該漏斗48的底部設有安裝托架53，可將該漏斗固裝於 滾輪座架31上，並設有銷孔可承接該架座上的定位銷&， 而來精確地定位該漏斗。 輸送管嘴19狀如一伸長管體，係由一耐高溫材料例如 氧化鋁石墨所製成。其下部呈推拔狀地往内向下地收來匯 15 集，而能伸入該二滾輪16之間的軋口中。其設有—安穿托 架60，俾能將其支撐在滾輪座架31上，且其上部設有向外 突出的侧凸緣55定位在該安裝托架6〇上。 管嘴19可具有一系列水平間隔分開而垂直延伸的流 路，其能遍及該等滾輪的寬度來產生適當低速的金屬饋 20料，並將該等熔融金屬輪入該二滾輪之間的軋口中，而不 會直接衝擊首先發生固化的滾輪表面。或者，該管嘴亦可 具有單一連續的隙孔出口來將一低速的熔融金屬幕直接導 入該二滾輪之間的軋口中，及/或其亦可浸入該熔融金屬 漿内。 11 10 15 20 該料漿會被板 當該滾輪承座麵鑄站時，該等圍板衰輪的兩端内， 的階狀端57。側圍板56係由一耐高溫材料亥等滾輪 成，並具有敏槽側緣81可匹 ^化删所製 莖缸早心的運作而在麼鑄站移動，以使 厂輯操作時緊抵該等滾輪的階狀端， 圍= 之金屬炼榮的端部封阻物。 ^寻展輪上 作時，該_的#止桿#將會運作而使溶融 ^屬能從軸触人漏相，並經由輸送管嘴流至該二滾 輪令。該條帶成品2〇的清_端可藉_護床枱_運作來 導入該捲收H22料射。賴床㈣會由域架上的框 裝物97縣延伸，而在該清潔頭端形成之後，可藉-液壓 單元98的運作來朝向捲收器擺動。該護床祕可操作頂抵 -由活塞红單元i i運作的上條帶導片9 9，且該條帶成品2 〇 會被限制於-對垂直_滾輪1G2之間。當該頭端被導入捲 收器的炎顎中之後，該捲收器21將會旋轉來捲收該條帶成 品20,嗣該護床枱96可擺回至其體止位置，即其任由機上 自由垂懸處，而不再接觸已被直接導入捲收器以中的條帶 成tm。如此製成的條帶2〇可被後續移轉至另一捲收器η， 而來形成一最後的料卷以便由該壓鑄機處送走。 示於第1至5圖中之該種雙滚輪壓轉機的全部細節乃更 完整揭露於我們的No.5184668及5277243等美國專利，以及 PCT/AU93/00593國際專利申請案中。 12 錳鈔去氧低碳鋼條帶在雙滾輪壓鑄機中的軋延鑄造已 顯示該等去氧化包容物的熔點對MnO/Si〇2比率的變化十分 敏感。此係示於第6圖中，其中示出包容物熔點相對於其 MnO/Si〇2比率的變化曲線。在鑄造低碳鋼條帶時的鑄造溫 5 度係約為1580°C。由第6圖中可以看出，在該MnO/Si〇2比的 某一範圍内，其包容物熔點會比此鑄造溫度高出甚多，可 能超過1700°C以此較高熔點其將不可能滿足在壓鑄滾輪表 面上維持一液態膜的要求，故以此成分的鋼將不能鑄造。 又，在該鋼料輸送系統之管嘴及其它部份的流路阻塞將會 1〇 變成一大問題。 雖在該鋼中之錳和矽的含量係可被調整來造成所需的 MnO/Si〇2比例，但經驗顯示在一般工場操作中實在很難達 到並保持所需的Mn0/Si〇2比。例如，我們曾判斷具有0.6% 链含量及0.3%矽含量的鋼成分應具有所需的化學性，且依 15 據衡平算法應能製成大於1.2的MnO/Si〇2比。但是，我們在 一普通軋鑄工場中的實際操作經驗顯示，其僅能獲得更低 甚多的MnO/Si〇2比。此係示於第7圖中，其中MnO/Si〇2比 係在一商用規模鋼條鑄造機壓鑄M06鋼條時，取自不同部 位之鋼樣品來進行包容物分析所獲得的MnO/Si〇2比，該等 20不同部位乃如下所示： L1 :洗桶 ΤΙ、T2、T3 :由澆桶承接金屬的漏斗 TP2、TP3 :在漏斗底下之一移轉片 占、1、2:製成之條帶的連續部位 13Finished strip of 2000mm width. 10 1330559 The pail 17 is entirely of conventional construction and is held on a suspended jack with a fork light 45 so that it can be brought to the position by a hot metal receiving station. The bucket is provided with a stop lever 46 that can be operated by a servo cylinder to allow the molten metal to flow from the wash tub into the drain bucket 18 via an outlet 47 and a high temperature resistant enclosure 48. The funnel 18 is also a conventional structure. The structure resembles a wide disk and is made of a high temperature resistant material such as magnesium oxide (Mg). One side of the funnel can receive the molten metal from the ladle' and is provided with the aforementioned overflow port 24 and emergency plug 25. The other side of the funnel 18 is provided with a series of longitudinally spaced apart metal discharge apertures 10 52 . The bottom of the funnel 48 is provided with a mounting bracket 53 which can be fixed to the roller frame 31 and provided with pin holes for receiving the positioning pins & on the frame to accurately position the funnel. The delivery nozzle 19 is shaped like an elongated tube and is made of a high temperature resistant material such as alumina graphite. The lower portion of the lower portion is fed inwardly downwardly to gather 15 sets, and can be inserted into the nip between the two rollers 16. It is provided with a bracket 60 which can be supported on the roller frame 31 and whose upper portion is provided with an outwardly projecting side flange 55 which is positioned on the mounting bracket 6〇. The nozzle 19 can have a series of horizontally spaced apart and vertically extending flow paths that can produce a suitably low velocity metal feed 20 throughout the width of the rollers and roll the molten metal between the two rollers. In the mouth, without directly impacting the surface of the roller that first solidifies. Alternatively, the nozzle may have a single continuous orifice outlet for directing a low velocity molten metal curtain directly into the nip between the two rollers and/or it may also be immersed in the molten metal slurry. 11 10 15 20 The slurry will be plated. When the roller bearing surface is cast, the stepped ends 57 of the two ends of the winding wheel are. The side wall 56 is made of a high-temperature resistant material such as a wheel, and has a sensitive groove side edge 81 which can be used to cut the early operation of the stem cylinder and move at the casting station to make the factory operation close. The stepped ends of the rollers are surrounded by the end seals of the metal refining. ^ When the search wheel is on, the ##止杆# of the _ will operate so that the melt can leak from the shaft and flow to the two-wheel command via the delivery nozzle. The clear _ end of the finished strip can be introduced into the take-up H22 shot by the _ guard bed _ operation. The bed (4) will extend from the frame 97 of the field frame, and after the cleaning head is formed, it can be swung toward the retractor by the operation of the hydraulic unit 98. The guard bed is operable to abut against the upper strip guide 9 9 operated by the piston red unit i i and the strip finished product 2 〇 will be constrained between the pair of vertical_rollers 1G2. After the head end is introduced into the sputum of the retractor, the retractor 21 will rotate to retract the strip product 20, and the cot 96 can be swung back to its body position, ie, It is freely suspended by the machine, and no longer contacts the strip that has been directly introduced into the retractor into tm. The strip 2 thus produced can be subsequently transferred to another retractor η to form a final roll for transport away by the die casting machine. The full details of such a two-roller press shown in Figures 1 through 5 are more fully disclosed in U.S. Patent Nos. 5,184, 668 and 5, 277, 243, and PCT/AU93/00593 International Patent Application. The rolling casting of 12 manganese bank deoxidized low carbon steel strips in a double roller die casting machine has shown that the melting points of these deoxidized inclusions are very sensitive to changes in the MnO/Si〇2 ratio. This is shown in Figure 6, which shows the change in the melting point of the inclusions relative to its MnO/Si〇2 ratio. The casting temperature at the casting of the low carbon steel strip is about 1580 °C. It can be seen from Fig. 6 that within a certain range of the MnO/Si〇2 ratio, the melting point of the inclusions is much higher than the casting temperature, and may exceed 1700 ° C. It is possible to satisfy the requirement of maintaining a liquid film on the surface of the die-casting roller, so steel of this composition cannot be cast. Moreover, the blockage of the flow path in the nozzle and other parts of the steel material delivery system becomes a major problem. Although the manganese and niobium contents in the steel can be adjusted to cause the desired MnO/Si〇2 ratio, experience has shown that it is difficult to achieve and maintain the desired Mn0/Si〇2 ratio in general plant operations. . For example, we have determined that steel components with 0.6% chain content and 0.3% niobium content should have the required chemistry and should be capable of producing a MnO/Si〇2 ratio greater than 1.2. However, our practical experience in a conventional rolling mill shows that it can only obtain much lower MnO/Si〇2 ratios. This is shown in Fig. 7, in which the MnO/Si〇2 ratio is taken from a steel sample from different parts for MnO/Si〇 obtained by inclusion analysis in a commercial-scale steel bar casting machine die-casting M06 steel bar. 2 ratio, these 20 different parts are as follows: L1: washing bucket ΤΙ, T2, T3: funnel TP2, TP3 which is supported by metal from the pouring bucket: one of the rotating pieces under the funnel is occupied, 1, 2: Continuous part of the strip 13
Al2〇3以確保包容物熔點能低於1580〇c。最少約3%的八12〇3 乃是必要的，而一合理的最少量約為1〇%的Al2〇3<>針對〇 9 以上的MoN/Si〇2比值’其理論上係能以可忽略的Ai2〇3含量 來操作。但，如前所述，在一般工場中所實際得到的 5 M〇N/Si〇2比值會與理論算出的預測值不同，且在該壓鑄機 的不同部位亦有不同。而該熔點對該比值的變化非常敏感 測。因此最好能控制該八丨2〇3的程度，以製成八12〇3含量至少 為3%的>6夕猛去氧低碳鋼。 在開始固化時於該聚料之曲面（meniscus)上形成的固 10化包容物將會侷限其最終條帶成品的表面上，而可藉剝除 或酸洗來除去。相反地該等去氧化包容物會被遍佈在整個 條帶中。它們會比固化包容物更粗些，通常尺寸約為2至12 微米。它們能以SEM或其它技術來容易地檢出。 第10〜12圖皆為SEM的顯微照片，乃示出MnO . Si〇2 . 15 Al2〇3等包容物的測量尺寸。各照片代表61 χ500μπι的條帶20 截面’而被放大來分別示出Mn〇. Si〇2. Al2〇3包容物7、8、 9等。該等顯微照片#放大率和比例乃被示於各圖中。Al2〇3 to ensure that the melting point of the inclusions is below 1580〇c. A minimum of about 3% of 8 12〇3 is necessary, and a reasonable minimum amount of about 1% Al2〇3<> for a MoN/Si〇2 ratio of 〇9 or more' is theoretically Negligible Ai2〇3 content to operate. However, as mentioned above, the 5 M〇N/Si〇2 ratio actually obtained in a general workshop is different from the theoretically calculated predicted value and is different in different parts of the die casting machine. The melting point is very sensitive to changes in the ratio. Therefore, it is preferable to control the extent of the 丨2〇3 to produce a >6 sulphur deoxidized low carbon steel having an octa 12〇3 content of at least 3%. The solid inclusions formed on the meniscus of the polymer at the beginning of curing will be limited to the surface of the final strip finished product and may be removed by stripping or pickling. Conversely, the deoxidized inclusions will be spread throughout the strip. They will be thicker than the cured inclusions and typically have a size of about 2 to 12 microns. They can be easily detected by SEM or other techniques. Figures 10 to 12 are all photomicrographs of SEM, showing the measured dimensions of inclusions such as MnO.Si〇2.15 Al2〇3. Each photograph represents a strip 20 cross section of 61 χ 500 μm and is enlarged to show Mn〇. Si〇2. Al2〇3 inclusions 7, 8, 9, and the like, respectively. These photomicrographs # magnifications and ratios are shown in the figures.
MnO Si〇2 Α12ο3包谷物7的直徑約為9.3μιη，*包容物8 的直徑約為5.6μπι’包容物9的直徑約為4.一。 20 藉以一電子束來轟擊各MnO· Si02· Al2〇3包容物7、8、 9 ’則X光會由。玄等包容物射出，而造成如13〜15圖所示之 各光譜。該等光譜的X轴表示X光能量的Kev，而y轴表示在 不同能階所測得的計數。因為在該包容物中的各氧化物在 整個光譜中皆具有-獨特的X光放射特性，故各包容物7、 15 1330559 8、9的成分在將專業人員所習知的原子交互作用修正列入 考量後即可被決定。 針對第10圖之直徑為9.3μηι的MnO. Si02· A12o3包容物 7而言，第13圖的對應列表乃示出該包容物的氧化物成分和 5 氧化物的分配比例如下： 氧化物 所測得重量百分比 正常重量百分比 MgO 1.06 1.11 ai2o3 41.13 43.19 Si02 26.91 28.26 SO 0.82 0.86 CaO 1.61 1.69 Ti02 1.17 1.23 MnO 21.19 22.25 FeO 1.30 1.37 總和 99.96 針對第11圖之直徑為5·6μιη的MnO· Si〇2· A12o3包容物 8而言，第14圖的對應列表乃示出該包容物的氧化物成分和 氧化物的分配比例如下： 氧化物 所測得重量百分比 正常重量百分比 MgO 0.65 0.68 AI2O3 38.02 39.92 Si02 27.32 28.69 . SO 0.73 0.77 CaO 0.34 0.36 Ti02 1.15 1.21 MnO 25.11 26.37 FeO 1.70 1.79 總和 99.79 針對第12圖之直徑為4.1μπι的MnO. Si02· A12o3包容物 9而言，第14圖的對應列表乃示出該包容物的氧化物成分和 氧化物的分配比例如下： 16 1330559 氧化物 所測得重量百分比 正常重量百分比 MgO 0.35 0.38 AI2O3 32.54 35.14 Si02 28.26 30.52 SO 0.70 0.76 CaO 0.56 0.60 Ti02 1.07 1.16 MnO 26.35 28.46 FeO 2.69 2.91 總和 99.93 該等測量值顯示出該等包容物7、8、9的Al2〇3含量皆 ， 低於約45%，且直徑係為2至12μπι之間的不同尺寸。又，該 φ 各MnO . Si〇2 · Al2〇3包容物之各MnO/Si〇2的測量比值，於 5 包容物7係為0.79，包容物8為0.92，而包容物9為0.93。 雖本發明已參照若干實施例在以上圖式和描述中詳細 說明，惟應請瞭解該等描述僅為舉例說明而非實質限制， 且本發明並不受限於所揭實施例。而是，本發明應涵蓋所 · 有包含於本發明之範圍和精神内的各種變化、修正及等效 10 結構等。本發明之其它特徵在專業人員參酌以上舉例之目 前所知實施本發明的最佳模式之詳細說明後應可容易得 · 知。許多修正變化亦可實施於上述之本發明，而不超出本 發明的精神與範圍。 t圖式簡單說明3 15 第1圖為可依本發明來操作之一連續條帶鑄造機的頂 ^ 視圖， 第2圖為第1圖之條帶鑄造機的側視圖； 第3圖為沿第1圖之3-3線的垂直截面圖； 第4圖為沿第1圖之4-4線的垂直截面圖； 17 1330559 第5圖為沿第1圖之5-5線的垂直截面圖； 第6圖示出Mn0/Si02比率對包容物熔點的影響； 第7圖示出在鑄造低碳鋼條時對取自一條帶鑄造機之 不同部位的樣品進行包容物分析所得到的Mn0/Si02比率； 5 . 第8圖示出添加不同的Al2〇3含量對包容物熔點的影 響； 第9圖示出當鑄造低碳鋼時如何在一安全操作範圍内 來調整ai2o3含量，俾使該等氧化包容物的熔點保持在大約 1580°C的鑄造溫度以下； 10 第10圖為直徑9.3微米之MnO · Si02 · A12o3包容物的顯 微照片； 第11圖為直徑5.6微米之]^11〇.5丨02-八12〇3包容物的顯 微照片； 第12圖為直徑4.1微米之MnO · Si02 . A12o3包容物的顧 15 微照片； 第13圖為第10圖之MnO. Si02· Al2o3包容物的X光譜； 第14圖為第11圖之MnO· Si02· A12o3包容物的X光譜； 及 第15圖為第12圖之MnO. Si02· A12o3包容物的X光譜。 20 【圖式之主要元件代表符號表】 14···組合站 15…壓鑄站 16…壓鑄滾輪 17…澆桶 7，8，9…包容物 11…主機架 12···地板 13…滾輪承座 18 1330559 37，38，83，98…液壓缸單元 39，101…活塞缸單元 18…漏斗 19…輸送管嘴 20…鋼條 21，22…捲收器 23…容器 24…溢流口 25…套塞 30…鑄漿 31…座架 32…輪子 33…軌道 34…滾輪搖台 35，36···滑動件 40…驅動托架 41…驅動轴 42…水管 43…封蓋 45…叉輛 46…擔止桿 47…出口 48…圍板 52…金屬排出孔 53，60··.安裝托架 54…定位銷 55…側凸緣 56…側圍板 57…階狀端 81…側緣 82…固板件 96…護床枱 97…樞裝物 99…導片 102···側滾輪The diameter of the MnO Si〇2 Α12ο3 grain 7 is about 9.3 μm, and the diameter of the inclusion 8 is about 5.6 μm. The diameter of the inclusion 9 is about 4. 20 By X-ray bombarding each of the MnO·SiO 2 · Al 2 〇 3 inclusions 7, 8, 9 ', the X-ray will be used. Xuan and other inclusions are emitted, resulting in spectra as shown in Figures 13-15. The X-axis of the spectra represents the Kev of the X-ray energy, while the y-axis represents the counts measured at different energy levels. Since each oxide in the inclusion has a unique X-ray emission characteristic throughout the spectrum, the composition of each inclusion 7, 15 1330559 8 , 9 is corrected in the atomic interactions known to those skilled in the art. It can be decided after considering the amount. For the MnO.SiO 2 · A12o3 inclusion 7 having a diameter of 9.3 μm in Fig. 10, the corresponding list of Fig. 13 shows that the distribution ratio of the oxide component and the 5 oxide of the inclusion is as follows: % by weight Normal weight percentage MgO 1.06 1.11 ai2o3 41.13 43.19 Si02 26.91 28.26 SO 0.82 0.86 CaO 1.61 1.69 Ti02 1.17 1.23 MnO 21.19 22.25 FeO 1.30 1.37 Total 99.96 MnO· Si〇2· A12o3 for diameter 5·6μηη for Fig. 11 For inclusions 8, the corresponding list of Figure 14 shows the distribution ratio of oxide components and oxides of the inclusions as follows: Weight percent measured by oxide Normal weight percentage MgO 0.65 0.68 AI2O3 38.02 39.92 Si02 27.32 28.69 . SO 0.73 0.77 CaO 0.34 0.36 Ti02 1.15 1.21 MnO 25.11 26.37 FeO 1.70 1.79 Total 99.79 For the MnO. Si02·A12o3 inclusion 9 having a diameter of 4.1 μm in Fig. 12, the corresponding list of Fig. 14 shows the inclusion. The distribution ratio of oxide component and oxide is as follows: 16 1330559 Oxide measured weight percentage normal weight percentage MgO 0.35 0.38 AI2O3 32.54 35.14 Si02 28.26 30.52 SO 0.70 0.76 CaO 0.56 0.60 Ti02 1.07 1.16 MnO 26.35 28.46 FeO 2.69 2.91 Total 99.93 These measurements show that the contents of Al2〇3 of these inclusions 7, 8, 9 are lower than About 45%, and the diameter is between 2 and 12 μm different sizes. Further, the measured ratio of each MnO/Si 〇 2 of the φ MnO . Si 〇 2 · Al 2 〇 3 inclusions was 0.79 in the 5 inclusions 7, 0.92 in the inclusions 8, and 0.93 in the inclusions 9. The present invention has been described in detail with reference to the accompanying drawings, and the description of the invention. Rather, the invention is to cover various modifications, modifications, and equivalents, and the like, which are included within the scope and spirit of the invention. Other features of the present invention will become readily apparent to those skilled in the art in the <RTIgt; Many modifications may be made to the invention described above without departing from the spirit and scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS 3 15 Figure 1 is a top view of a continuous strip casting machine that can be operated in accordance with the present invention, and Figure 2 is a side view of the strip casting machine of Figure 1; Fig. 1 is a vertical sectional view taken along line 3-3 of Fig. 1; Fig. 4 is a vertical sectional view taken along line 4-4 of Fig. 1; 17 1330559 Fig. 5 is a vertical sectional view taken along line 5-5 of Fig. 1 Figure 6 shows the effect of the Mn0/SiO2 ratio on the melting point of the inclusions; Figure 7 shows the Mn0/ obtained from the inclusion analysis of samples taken from different parts of a belt casting machine when casting low carbon steel bars. Si02 ratio; 5. Figure 8 shows the effect of adding different Al2〇3 content on the melting point of the inclusions; Figure 9 shows how to adjust the ai2o3 content within a safe operating range when casting low carbon steel, so that The melting point of the iso-oxidized inclusions is kept below the casting temperature of about 1580 ° C; 10 Figure 10 is a photomicrograph of MnO · Si02 · A12o3 inclusions having a diameter of 9.3 μm; Figure 11 is a diameter of 5.6 μm ^^11〇 .5丨02-八12〇3 micrograph of the inclusions; Fig. 12 is the MnO · Si02 with a diameter of 4.1 μm. Gu 15 of the A12o3 inclusion Photograph; Fig. 13 is the X spectrum of the MnO.Si02·Al2o3 inclusions in Fig. 10; Fig. 14 is the X spectrum of the MnO·SiO 2 · A12o3 inclusions in Fig. 11; and Fig. 15 is the MnO in Fig. 12 X-ray spectrum of Si02· A12o3 inclusions. 20 [Main component representative symbol table of the drawing] 14··· Combined station 15... Die-casting station 16... Die-casting roller 17...Pour bucket 7,8,9...Inclusion 11...Main frame 12···Floor 13...Roller bearing Seat 18 1330559 37, 38, 83, 98... Hydraulic cylinder unit 39, 101... Piston cylinder unit 18... Funnel 19... Delivery nozzle 20... Steel strip 21, 22... Retractor 23... Container 24... Overflow port 25... Sleeve 30...casting 31...mount 32...wheel 33...track 34...roller cradle 35,36···slider 40...drive bracket 41...drive shaft 42...water tube 43...cover 45...fork 46 ...stop bar 47...outlet 48...wall 52...metal discharge hole 53,60·.mounting bracket 54...positioning pin 55... side flange 56... side panel 57... stepped end 81... side edge 82... Solid plate member 96...Guard bed table 97... pivoting device 99... Guide piece 102··· side roller
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