TWI450973B - Steel making process - Google Patents
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本發明是有關於一種煉鋼製程，且特別是有關於一種適用於煉製加鈣處理鋼種的煉鋼製程。The present invention relates to a steelmaking process, and more particularly to a steelmaking process suitable for use in refining calcium-treated steel grades.
在鋼胚(Slab)的生產製程中，為了提升生產效率，通常會以連續鑄造方式來生產鋼胚，其中利用此方式生產之鋼胚一般稱之為連鑄鋼胚。而在上述連鑄鋼胚之特定煉鋼過程中，會加入鈣以控制形成連鑄鋼胚之鋼液中介在物的形態。In the production process of steel slabs, in order to improve production efficiency, steel slabs are usually produced in a continuous casting manner, and steel slabs produced by this method are generally referred to as continuous casting steel slabs. In the specific steelmaking process of the above-mentioned continuous casting steel preform, calcium is added to control the form of the steel liquid intermediate formed by the continuous casting steel.
上述加鈣處理鋼種的煉鋼製程簡述如下，首先進行轉爐(Basic Oxygen Furnace；BOF)煉鋼步驟，以對轉爐中之鋼液進行吹氧除碳。接著，進行盛鋼桶精煉步驟，於盛鋼桶精煉站之盛鋼桶精煉爐(Ladle Furnace；LF)對鋼液進行升溫與調渣。完成盛鋼桶精煉步驟後，進行真空精煉(RH)步驟，以真空脫氣設備促進鋼液中所包含之氧與碳的結合，進而對鋼液脫氧與脫碳。此外，在真空精煉步驟中，更添加特定之合金至鋼液中，藉此調整鋼液之成分。再者，更可於真空精煉步驟中實施吹氧程序，藉此提升鋼液之溫度，或對鋼液實施吹射脫硫程序。The steelmaking process of the above-mentioned calcium-added steel is briefly described as follows. First, a converter (Basic Oxygen Furnace; BOF) steelmaking step is carried out to perform oxygen blowing and carbon removal on the molten steel in the converter. Next, the steel drum refining step is carried out, and the molten steel is heated and slag-regulated at the ladle furnace of the Shenggang refining station (Ladle Furnace; LF). After the completion of the steel drum refining step, a vacuum refining (RH) step is performed to promote the combination of oxygen and carbon contained in the molten steel by vacuum degassing equipment, thereby deoxidizing and decarburizing the molten steel. In addition, in the vacuum refining step, a specific alloy is added to the molten steel to adjust the composition of the molten steel. Furthermore, the oxygen blowing process can be carried out in the vacuum refining step, thereby increasing the temperature of the molten steel or performing a blow desulfurization procedure on the molten steel.
緊接在上述盛鋼桶精煉步驟之後，進行加鈣步驟，由鋼液之表面射入鈣線，以形成熔融態之加鈣處理鋼種。最後，進行澆鑄步驟，藉此形成連鑄鋼胚。Immediately after the above-mentioned ladle refining step, a calcium addition step is performed to inject a calcium wire from the surface of the molten steel to form a molten calcium-treated steel. Finally, a casting step is carried out whereby a continuous cast steel blank is formed.
在上述加鈣處理鋼種的煉鋼製程中，若鋼液中之鈣回收不佳，則於澆鑄過程中，盛鋼桶之流鋼嘴以及鋼液分配器(Tundish)之浸入式鎔鋼嘴(SEN)容易發生堵塞。特別是在澆鑄過程的末期，此時盛鋼桶之流鋼嘴的鋼通量越來越小，甚至當盛鋼桶底部之閥門全部打開之後，鋼液分配器之鋼通量仍然無法滿足連續鑄造所需之鋼通量。更有甚者，鋼液持續凝固並累積於盛鋼桶之流鋼嘴或鋼液分配器之浸入式鎔鋼嘴中，使得澆鑄過程中斷。In the steelmaking process of the above-mentioned calcium-treated steel, if the calcium in the molten steel is not well recovered, the steel nozzle of the steel drum and the immersed steel nozzle of the steel distributor (Tundish) during the casting process ( SEN) is prone to blockage. Especially at the end of the casting process, at this time, the steel flux of the steel nozzle of the steel drum is getting smaller and smaller. Even when the valve at the bottom of the steel drum is fully opened, the steel flux of the steel liquid distributor still cannot meet the continuous flow. The steel flux required for casting. What is more, the molten steel continues to solidify and accumulates in the immersion type steel nozzle of the steel ladle or the steel liquid distributor, which interrupts the casting process.
經研究後顯示，盛鋼桶之流鋼嘴或鋼液分配器之浸入式鎔鋼嘴中是否會產生阻塞之情況，主要係與鋼液中所加入之鈣含量多寡有關，其中鈣含量太多或太少，都會造成上述之阻塞情況。而在上述加鈣步驟中，加鈣主要係避免形成固態三氧化二鋁(Al2 O3 )，藉由添加適量的鈣，可將三氧化二鋁轉變為液態。然而，當鋼液中所加入之鈣含量太少時，容易在鋼液中形成由氧化鈣與三氧化二鋁所組成之高熔點的鋁酸鈣化合物(CaO‧2 Al2 O3 )，故容易造成上述之堵塞現象。而當鋼液中所加入之鈣含量太多時，則容易在鋼液中形成高熔點之硫化鈣(CaS)，同樣亦容易造成上述之堵塞現象。因此，所添加鈣之含量的多寡與鋼液中之熔渣成分與含量有關。若能在煉鋼製程中擁有精確的熔渣設計能力和控制技術，則可控制所添加鈣的含量，進而避免造成上述之堵塞現象。After research, it is shown whether there is a blockage in the immersion type steel nozzle of the steel drum or the steel liquid distributor of the steel drum, which is mainly related to the amount of calcium added in the molten steel, wherein the calcium content is too much. Or too little, will cause the above blocking situation. In the above calcium addition step, the addition of calcium mainly avoids the formation of solid aluminum oxide (Al 2 O 3 ), and the aluminum oxide can be converted into a liquid state by adding an appropriate amount of calcium. However, when the calcium content added to the molten steel is too small, a high melting point calcium aluminate compound (CaO‧2 Al 2 O 3 ) composed of calcium oxide and aluminum oxide is easily formed in the molten steel, so It is easy to cause the above clogging phenomenon. When the amount of calcium added to the molten steel is too large, it is easy to form high-melting calcium sulfide (CaS) in the molten steel, which is also liable to cause the above-mentioned clogging phenomenon. Therefore, the amount of calcium added is related to the slag composition and content in the molten steel. If you have accurate slag design capabilities and control techniques in the steelmaking process, you can control the amount of calcium added to avoid the above-mentioned blockage.
此外，當上述堵塞情況形成之後，必須暫停澆鑄過程，並將鋼液回爐重新煉製。因此，將增加原料與能源的損耗，並影響煉鋼製程整體的產能。In addition, after the above-mentioned clogging condition is formed, the casting process must be suspended and the molten steel is returned to the furnace for re-refining. Therefore, it will increase the loss of raw materials and energy, and affect the overall production capacity of the steelmaking process.
在習知技術中，美國賓夕法尼亞州華倫岱爾市出版之鋼鐵技術協會2009會議記錄第543至558頁之文章「鋼澆注製程中盛鋼桶噴嘴堵塞之調查」(Investigation on Ladle Nozzle Clogging during Steel Pouring Process: AISTech 2009 Proceedings,vol. II,Warrandale,PA,2009,pp.543-558.)揭露有與加鈣處理鋼種相關之煉鋼製程，其主要步驟包含在轉爐吹煉完成時添加渣改質劑，並於精煉完成時進行矽化鈣線添加處理，此製程主要缺點在於需使用渣改質劑。In the prior art, the Steel Technology Association's 2009 Conference Record, pp. 543-558, published in Warrendale, PA, USA, "Investigation on Ladle Nozzle Clogging during Steel" (Investigation on Ladle Nozzle Clogging during Steel) Pouring Process: AISTech 2009 Proceedings, vol. II, Warrandale, PA, 2009, pp. 543-558.) discloses a steelmaking process associated with the addition of calcium-treated steels, the main steps of which include the addition of slag to the conversion of the converter. The granule is added to the calcium sulphate line when the refining is completed. The main disadvantage of this process is the use of a slag modifier.
此外，安徽冶金2009年第2期第33至37頁之文章「鈣鐵包蕊線的製作及其在鈣處理中的應用」亦揭露有與加鈣處理鋼種相關之煉鋼製程，其主要步驟包含在轉爐出鋼過程中添加合金之後，再以5公斤之精煉渣/每噸之鋼液至8公斤之精煉渣/每噸之鋼液之比例將精煉渣加入至盛鋼桶之鋼液中，接著以盛鋼桶精煉爐進行調渣精煉，最後進行加鈣處理。其中，此製程主要缺點在於必須以盛鋼桶精煉爐進行升溫調渣，因此將增加能源成本支出。In addition, Anhui Metallurgy, No. 2, 2009, pp. 33-37, "The production of calcium iron core wire and its application in calcium processing" also reveals the steelmaking process associated with calcium-added steel grades. After adding the alloy during the tapping process of the converter, the refining slag is added to the molten steel in the ladle by the ratio of 5 kg of refining slag per ton of molten steel to 8 kg of refining slag per ton of molten steel. Then, the slag refining process is carried out in a steel drum refining furnace, and finally the calcium treatment is performed. Among them, the main disadvantage of this process is that it must be heated and slag-regulated in a steel drum refining furnace, thus increasing energy costs.
因此，本發明之目的係在提供一種煉鋼製程，其適用於煉製加鈣處理鋼種，藉由將出鋼步驟、精煉脫氧以及合金化製程最佳化，可避免上述鈣回收不佳進而導致堵塞之情況。Accordingly, the object of the present invention is to provide a steelmaking process suitable for refining calcium-treated steels, which can avoid the poor calcium recovery due to the optimization of the tapping step, the refining deoxidation and the alloying process. The situation of blockage.
根據本發明之一實施例，提供一種適用於煉製加鈣處理鋼種之煉鋼製程。此煉鋼製程包含：進行提供鋼液之前製程；進行出鋼步驟，以於鋼液之出鋼過程中，添加金屬鋁及錳鐵合金至此鋼液中，其中金屬鋁與鋼液之比例範圍為1.4公斤之金屬鋁/每噸之鋼液至2.0公斤之金屬鋁/每噸之鋼液，而錳鐵合金與鋼液之比例範圍為10公斤之錳鐵合金/每噸之鋼液至20公斤之錳鐵合金/每噸之鋼液；進行出鋼後步驟，以於鋼液之出鋼過程之後，添加金屬鋁至鋼液中，並對此鋼液進行1分鐘至3分鐘的攪拌，其中金屬鋁與鋼液之比例範圍為0.3公斤之金屬鋁/每噸之鋼液至0.6公斤之金屬鋁/每噸之鋼液；進行真空精煉步驟，以添加特定之合金至上述鋼液以調整此鋼液之成分；以及進行加鈣步驟，以添加鈣線至上述鋼液中以形成加鈣處理鋼種。According to an embodiment of the present invention, a steelmaking process suitable for refining a calcium-treated steel grade is provided. The steelmaking process comprises: performing a process before supplying molten steel; performing a tapping step to add metal aluminum and ferromanganese alloy to the molten steel during the tapping process of the molten steel, wherein the ratio of the metal aluminum to the molten steel is in the range of 1.4 Kilometers of metal aluminum per ton of molten steel to 2.0 kg of metal aluminum per ton of molten steel, and ferromanganese alloy to molten steel in the range of 10 kg of ferromanganese alloy / per ton of molten steel to 20 kg of ferromanganese / per ton of molten steel; after the tapping step, after the steel liquid tapping process, adding metal aluminum to the molten steel, and stirring the molten steel for 1 minute to 3 minutes, wherein the metal aluminum and steel The ratio of the liquid ranges from 0.3 kg of metal aluminum per ton of molten steel to 0.6 kg of metal aluminum per ton of molten steel; a vacuum refining step is performed to add a specific alloy to the above molten steel to adjust the composition of the molten steel And performing a calcium addition step to add a calcium wire to the above molten steel to form a calcium-treated steel.
根據本創作之另一實施例，上述煉鋼製程之加鈣步驟更包含添加氬氣至上述鋼液中，藉由此氬氣攪拌鋼液，以使得鋼液之成分與溫度均勻。According to another embodiment of the present invention, the step of adding calcium to the steelmaking process further comprises adding argon gas to the molten steel, whereby the molten steel is stirred by the argon gas to make the composition and temperature of the molten steel uniform.
根據本發明之又一實施例，上述煉鋼製程更包含於加鈣步驟之後進行澆鑄步驟，用以澆鑄熔融態之加鈣處理鋼種，藉此形成連鑄鋼胚。According to still another embodiment of the present invention, the steelmaking process further includes a casting step after the step of adding calcium to cast a molten calcium-treated steel grade, thereby forming a continuous casting steel preform.
本發明之優點在於藉由將出鋼步驟與精煉脫氧以及合金化製程最佳化，並利用合金的脫氧性與鋼渣充分反映，以有效降低鋼渣氧化性，進而達到無需進行盛鋼桶精煉步驟或採用渣改質劑即可提高鈣回收率之目標。因此，可大幅減少加鈣處理鋼種之煉鋼製程的成本支出。The invention has the advantages of optimizing the tapping step, the refining deoxidation and the alloying process, and fully utilizing the deoxidation of the alloy and the steel slag to effectively reduce the oxidation of the steel slag, thereby achieving no need to carry out the steel drum refining step or The use of slag modifiers can increase the goal of calcium recovery. Therefore, the cost of the steelmaking process of the calcium-treated steel can be greatly reduced.
請參照第1圖，其係繪示根據本發明之一實施例之煉鋼製程的流程圖，其中此煉鋼製程係適用於煉製加鈣處理鋼種。煉鋼製程100開始於前製程102。在前製程102中，主要係用以提供一鋼液，其中前製程102可包含多個熟悉此技藝者所熟知之製程步驟。例如在特定實施例中，前製程102更包含有脫硫步驟，其中此脫硫步驟係用以添加脫硫劑[例如氧化鈣(CaO)]至上述鋼液中，並對此鋼液進行攪拌以去除鋼液中的硫成分，例如常見之KR脫硫法。Please refer to FIG. 1 , which is a flow chart showing a steel making process according to an embodiment of the present invention, wherein the steel making process is suitable for refining calcium-treated steel. The steelmaking process 100 begins with a pre-process 102. In the pre-process 102, primarily used to provide a molten steel, wherein the pre-process 102 can include a plurality of process steps well known to those skilled in the art. For example, in a specific embodiment, the pre-process 102 further includes a desulfurization step, wherein the desulfurization step is performed by adding a desulfurizing agent [such as calcium oxide (CaO)] to the molten steel, and stirring the molten steel. To remove sulfur components in the molten steel, such as the common KR desulfurization method.
此外，在其他實施例中，前製程102更包含轉爐煉鋼步驟，用以對容設在特定之轉爐中之上述鋼液進行吹煉步驟或強制脫氧步驟，其中吹煉步驟係用以對鋼液進行吹氧除碳。In addition, in other embodiments, the front process 102 further includes a converter steelmaking step for performing a blowing step or a forced deoxidation step on the molten steel contained in a specific converter, wherein the blowing step is used for steel The liquid is subjected to oxygen blowing and carbon removal.
煉鋼製程100繼續進行至出鋼步驟104，在上述前製程102之鋼液的出鋼過程中，添加金屬鋁及錳鐵合金至鋼液中，其中金屬鋁與鋼液之比例範圍為1.4公斤之金屬鋁/每噸之鋼液至2.0公斤之金屬鋁/每噸之鋼液。若金屬鋁與鋼液之比例小於1.4公斤之金屬鋁/每噸之鋼液，則鋼液有脫氧不完全之慮。反之，若金屬鋁與鋼液之比例大於2.0公斤之金屬鋁/每噸之鋼液，則鋼液中含熔解鋁偏高有超出鋼品規格之慮。故金屬鋁與鋼液之比例範圍較佳係介於上述二數據之間。The steelmaking process 100 proceeds to the tapping step 104, in which the metal aluminum and the ferromanganese alloy are added to the molten steel during the tapping process of the molten steel of the pre-process 102, wherein the ratio of the metal aluminum to the molten steel ranges from 1.4 kg. Metallic aluminum per ton of molten steel to 2.0 kg of metallic aluminum per ton of molten steel. If the ratio of metal aluminum to molten steel is less than 1.4 kg of metal aluminum per ton of molten steel, the molten steel is not completely deoxidized. On the other hand, if the ratio of metal aluminum to molten steel is greater than 2.0 kg of metal aluminum per ton of molten steel, the molten aluminum in the molten steel is higher than steel specifications. Therefore, the ratio of the ratio of the metal aluminum to the molten steel is preferably between the above two data.
此外，在上述出鋼步驟104中，錳鐵合金與鋼液之比例範圍為10公斤之錳鐵合金/每噸之鋼液至20公斤之錳鐵合金/每噸之鋼液。若錳鐵合金與鋼液之比例小於10公斤之錳鐵合金/每噸之鋼液，則產品無法滿足鋼品規範，因此需在後續之精煉步驟補加過量之錳合金。反之，若錳鐵合金與鋼液之比例大於20公斤之錳鐵合金/每噸之鋼液，則鋼品錳含量會超出規範。故錳鐵合金與鋼液之比例範圍較佳係介於上述二數據之間。Further, in the above-described tapping step 104, the ratio of the ferromanganese alloy to the molten steel ranges from 10 kg of ferromanganese alloy per ton of molten steel to 20 kg of ferromanganese per ton of molten steel. If the ratio of ferromanganese to steel is less than 10 kg of ferromanganese per ton of molten steel, the product cannot meet the specifications of the steel, so it is necessary to add an excess of manganese alloy in the subsequent refining step. Conversely, if the ratio of ferromanganese to steel is greater than 20 kg of ferromanganese per ton of molten steel, the manganese content of the steel will exceed the specification. Therefore, the ratio of the ratio of ferromanganese to molten steel is preferably between the above two data.
在出鋼步驟104中，添加金屬鋁至鋼液，主要係用來對鋼液進行脫氧，而添加錳鐵合金至鋼液，其主要功能係將鋼液之合金化提前，藉此降低後續之鋼液精煉的負擔。In the tapping step 104, adding metal aluminum to the molten steel is mainly used for deoxidizing the molten steel, and adding the ferromanganese alloy to the molten steel, the main function of which is to advance the alloying of the molten steel, thereby reducing the subsequent steel. The burden of liquid refining.
接著進行出鋼後步驟106，於上述鋼液之出鋼過程之後，添加與上述出鋼步驟104中相同之金屬鋁至鋼液中。此外，在將金屬鋁添加至鋼液中之後，更對此鋼液進行攪拌1分鐘至3分鐘，藉此使得金屬鋁與鋼液二者能夠充分混合。在此出鋼後步驟106中，若上述金屬鋁與鋼液之比例範圍太小，則無法有效降低熔渣之氧化性。反之，若金屬鋁與鋼液之比例範圍太大，則鋼液中含熔解鋁有超出鋼品規格之慮。故金屬鋁與鋼液之比例範圍較佳為0.3公斤之金屬鋁/每噸之鋼液至0.6公斤之金屬鋁/每噸之鋼液。Next, after the tapping step 106, after the steel tapping process, the same metal aluminum as in the tapping step 104 is added to the molten steel. Further, after the metal aluminum is added to the molten steel, the molten steel is further stirred for 1 minute to 3 minutes, whereby the metal aluminum and the molten steel can be sufficiently mixed. In the step 106 after the tapping, if the ratio of the metal aluminum to the molten steel is too small, the oxidizing property of the slag cannot be effectively reduced. On the other hand, if the ratio of the ratio of the metal aluminum to the molten steel is too large, the molten aluminum in the molten steel may exceed the specifications of the steel. Therefore, the ratio of metal aluminum to molten steel is preferably in the range of 0.3 kg of metal aluminum per ton of molten steel to 0.6 kg of metal aluminum per ton of molten steel.
在完成上述出鋼後步驟106之後，煉鋼製程100接著進行真空精煉步驟108。在真空精煉步驟108中，主要係用以添加特定之合金至經由上述出鋼後步驟106處理後的鋼液中，藉此調整鋼液的成分。在真空精煉步驟108中，更以真空脫氣設備來促進鋼液中所包含之氧與碳的結合，進而對鋼液進行脫氧與脫碳，亦即真空精煉步驟108包含對鋼液進行脫碳步驟與脫氧步驟。After the above-described post-out tapping step 106 is completed, the steel making process 100 is followed by a vacuum refining step 108. In the vacuum refining step 108, it is mainly used to add a specific alloy to the molten steel after the step 106 after the tapping, thereby adjusting the composition of the molten steel. In the vacuum refining step 108, the vacuum degassing device is further used to promote the combination of oxygen and carbon contained in the molten steel, thereby deoxidizing and decarburizing the molten steel, that is, the vacuum refining step 108 includes decarburizing the molten steel. Steps and deoxygenation steps.
此外，在特定之實施例中，更於真空精煉步驟108中使用氬氣環流管來促進鋼液於容器中的循環，藉此促進鋼液中之介在物的上浮。再者，真空精煉步驟108之功能更包含用以提高合金回收率。Moreover, in a particular embodiment, an argon circulation tube is used in the vacuum refining step 108 to promote circulation of the molten steel in the vessel, thereby promoting the buoyancy of the medium in the molten steel. Furthermore, the function of the vacuum refining step 108 is further included to increase alloy recovery.
煉鋼製程100接著進行加鈣步驟110，用以添加鈣至經由鋼液中，藉此形成加鈣處理鋼種。具體來說，將粉末狀或線狀之鈣由鋼液之表面射入，藉此形成熔融態之加鈣處理鋼種。而在特定之實施例中，為了避免製程中的揮發散逸，故在加鈣步驟110之所採用之鈣為鈣線。在加鈣步驟110中，加入鈣主要係用以控制鋼液中之介在物的形態，進而避免鋼液中形成容易堵塞盛鋼桶之流鋼嘴或鋼液分配器之浸入式鎔鋼嘴的高熔點化合物。The steelmaking process 100 is followed by a calcium addition step 110 for adding calcium to the molten steel to form a calcium-treated steel grade. Specifically, powdered or linear calcium is injected from the surface of the molten steel, thereby forming a molten calcium-treated steel. In a particular embodiment, the calcium used in the calcium addition step 110 is a calcium line in order to avoid volatilization during processing. In the calcium addition step 110, calcium is mainly added to control the morphology of the medium in the molten steel, thereby avoiding the formation of an immersed steel nozzle in the molten steel which easily blocks the flow nozzle or the steel liquid distributor of the steel drum. High melting point compound.
在特定之實施例中，上述之加鈣步驟110更包含添加氬氣至鋼液中，其主要功能係藉由氬氣來攪拌鋼液，藉此使得鋼液之成分與溫度均勻。此外，在加鈣步驟110中，為了進一步對鋼液進行脫氧，此加鈣步驟110更包含添加鋁線至鋼液中。In a particular embodiment, the calcium addition step 110 further comprises adding argon to the molten steel, the primary function of which is to agitate the molten steel by means of argon, thereby making the composition and temperature of the molten steel uniform. Further, in the calcium addition step 110, in order to further deoxidize the molten steel, the calcium addition step 110 further comprises adding an aluminum wire to the molten steel.
在完成加鈣步驟110之後，煉鋼製程100可接著進行澆鑄步驟112，用以澆鑄由加鈣步驟110所獲得之熔融態之加鈣處理鋼種，藉此形成連鑄鋼胚。After the calcium addition step 110 is completed, the steelmaking process 100 can then be followed by a casting step 112 for casting the molten calcium-treated steel grade obtained from the calcium addition step 110, thereby forming a continuous cast steel preform.
根據以上所述，煉鋼製程100所需添加鈣之含量的多寡與鋼液中之熔渣成分與含量有關。因此，在本發明之煉鋼製程100中，主要係利用控制出鋼步驟104與出鋼後步驟106中所添加之金屬鋁及錳鐵合金分別與鋼液之比例，來最佳化鋼液中熔渣之成分與含量，亦即透過將煉鋼製程100中之出鋼步驟、精煉脫氧以及合金化製程最佳化，進而控制所需添加之鈣的含量，避免造成上述之堵塞現象。在本發明之煉鋼製程100中，主要係藉由控制熔渣之成分與含量，進而控制所需添加之鈣的含量，可改善習知煉鋼製程中，鈣回收不佳之缺點，故可避免堵塞之情況的發生。According to the above, the amount of calcium required for the steelmaking process 100 is related to the slag composition and content in the molten steel. Therefore, in the steelmaking process 100 of the present invention, the ratio of the metal aluminum and the ferromanganese alloy added in the step 106 after the tapping step to the molten steel is preferably used to optimize the melting in the molten steel. The composition and content of the slag, that is, by optimizing the tapping step, the refining deoxidation, and the alloying process in the steel making process 100, thereby controlling the amount of calcium to be added, thereby avoiding the above-mentioned clogging phenomenon. In the steelmaking process 100 of the present invention, mainly by controlling the composition and content of the slag, thereby controlling the content of calcium to be added, the disadvantage of poor calcium recovery in the conventional steelmaking process can be improved, thereby avoiding The occurrence of a blockage.
相較於習知之煉鋼製程，本發明之煉鋼製程100排除了使用渣改質劑之步驟，亦即煉鋼製程100並未使用渣改質劑來降低渣的氧化性，可避免精煉過程中介在物持續的增加。若精煉過程中介在物持續的增加，在澆鑄過程未即時上浮去除，這些介在物將附著在浸入式鎔鋼嘴中，造成流道縮小鋼液流量不足而使得澆鑄過程中斷。Compared with the conventional steelmaking process, the steelmaking process 100 of the present invention excludes the step of using the slag modifier, that is, the steelmaking process 100 does not use the slag modifier to reduce the oxidizing property of the slag, and the refining process can be avoided. The intermediary continues to increase in things. If the intermediate process of the refining process continues to increase, and the casting process is not immediately removed, these intermediaries will adhere to the immersed steel grommet, causing the flow path to shrink the molten steel flow and causing the casting process to be interrupted.
此外，本發明之煉鋼製程100更排除了盛鋼桶精煉步驟。本發明之煉鋼製程100無需藉由盛鋼桶精煉步驟來升溫調渣，以提高鈣的回收率，進而達成增加鋼液澆鑄性的目的。因此，可大幅降低盛鋼桶精煉步驟中升溫所耗損之能源，達到節省煉鋼製程之成本的目的。In addition, the steelmaking process 100 of the present invention further excludes the refining step of the ladle. The steelmaking process 100 of the present invention does not need to be heated and tempered by a steel drum refining step to increase the recovery rate of calcium, thereby achieving the purpose of increasing the castability of molten steel. Therefore, the energy consumed by the temperature rise in the refining step of the ladle can be greatly reduced, and the cost of the steelmaking process can be saved.
請參照以下表一，其中表一係用以表示採用本發明之煉鋼製程100之實施例，以及採用習知包含有盛鋼桶精煉步驟之煉鋼製程之比較例二者所使用之金屬鋁、盛鋼桶精煉之能源費用以及鈣回收率的比較。其中，使用之金屬鋁係以每噸鋼液使用之鋁的公斤數來加以表示(單位為Kg/T)，而盛鋼桶精煉之能源費用則以每噸鋼液使用之電費來加以表示(單位為元/T)，至於鈣回收率之單位則為百分比(%)。Please refer to Table 1 below, wherein Table 1 is used to show the embodiment of the steelmaking process 100 of the present invention, and the metal aluminum used in the comparative example of the steelmaking process including the steel drum refining step. , the comparison of the energy costs of steel drum refining and the recovery rate of calcium. Among them, the metal aluminum used is expressed in kilograms of aluminum used per ton of molten steel (unit is Kg/T), and the energy cost of steel drum refining is expressed by the electricity cost per ton of molten steel ( The unit is yuan/T), and the unit of calcium recovery is percentage (%).
此外，要特別說明的是，表一中之比較例所採用之煉鋼製程，係實質等同於上述先前技術中所述之「加鈣處理鋼種的煉鋼製程」。In addition, it is to be noted that the steelmaking process employed in the comparative example in Table 1 is substantially equivalent to the "steelmaking process of the calcium-treated steel grade" described in the above prior art.
根據以上表一可知，相較於採用習知煉鋼製程之比較例，採用本發明之煉鋼製程100，除了每噸鋼液所使用之金屬鋁的用量較大之外，在每噸鋼液使用之電費以及鈣回收率二方面，煉鋼製程100均有較佳之表現。其中，較少的電費意味著較低的能源成本，而較佳的鈣回收率則意味著盛鋼桶之流鋼嘴以及鋼液分配器之浸入式鎔鋼嘴堵塞的機率較低。According to the above Table 1, compared with the comparative example using the conventional steelmaking process, the steelmaking process 100 of the present invention is used in addition to the amount of metal aluminum used per ton of molten steel, in each ton of molten steel. The steelmaking process 100 has better performance in terms of electricity consumption and calcium recovery rate. Among them, less electricity costs mean lower energy costs, and a better calcium recovery rate means that the flow of steel ladle and the liquefaction of the steel distributor is less likely to block.
雖然本發明已以實施方式揭露如上，然其並非用以限定本發明，任何熟習此技藝者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.
100．．．煉鋼製程100. . . Steel making process
102．．．前製程102. . . Pre-process
104．．．出鋼步驟104. . . Steel tapping step
106．．．出鋼後步驟106. . . Step after tapping
108．．．真空精煉步驟108. . . Vacuum refining step
110．．．加鈣步驟110. . . Calcium addition step
112．．．澆鑄步驟112. . . Casting step
為了能夠對本發明之觀點有較佳之理解，請參照上述之詳細說明並配合相應之圖式。要強調的是，根據工業之標準常規，附圖中之各種特徵並未依比例繪示。事實上，為清楚說明上述實施例，可任意地放大或縮小各種特徵之尺寸。相關圖式內容說明如下。For a better understanding of the present invention, reference is made to the above detailed description and the accompanying drawings. It is emphasized that, in accordance with the standard of the industry, the various features in the drawings are not to scale. In fact, the dimensions of the various features may be arbitrarily enlarged or reduced in order to clearly illustrate the above embodiments. The relevant schema description is as follows.
第1圖係繪示根據本發明之一實施例之煉鋼製程的流程圖，其中此煉鋼製程係適用於煉製加鈣處理鋼種。1 is a flow chart showing a steel making process according to an embodiment of the present invention, wherein the steel making process is suitable for refining calcium-treated steel.
100．．．煉鋼製程100. . . Steel making process
102．．．前製程102. . . Pre-process
104．．．出鋼步驟104. . . Steel tapping step
106．．．出鋼後步驟106. . . Step after tapping
108．．．真空精煉步驟108. . . Vacuum refining step
110．．．加鈣步驟110. . . Calcium addition step
112．．．澆鑄步驟112. . . Casting step
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4268305A (en) * | 1977-03-31 | 1981-05-19 | Union Siderurgique Du Nord Et De L'est De La France | Process for treating liquid steel intended in particular for manufacturing machine wire |
| EP0141804A1 (en) * | 1983-10-14 | 1985-05-15 | Vereinigte Edelstahlwerke Aktiengesellschaft (Vew) | Hadfield type manganese steel and process for the manufacture thereof |
| TW422884B (en) * | 1995-12-06 | 2001-02-21 | Wmc Resources Ltd | Mineral feed processing |
| TW555870B (en) * | 1997-07-29 | 2003-10-01 | Ugine Savoie Imphy | Austenitic stainless steel having a very low nickel content |
| TW200611977A (en) * | 2004-06-10 | 2006-04-16 | Affival | Cored wires |
| US20100000636A1 (en) * | 2006-06-16 | 2010-01-07 | Industeel Creusot | Duplex stainless steel |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4268305A (en) * | 1977-03-31 | 1981-05-19 | Union Siderurgique Du Nord Et De L'est De La France | Process for treating liquid steel intended in particular for manufacturing machine wire |
| EP0141804A1 (en) * | 1983-10-14 | 1985-05-15 | Vereinigte Edelstahlwerke Aktiengesellschaft (Vew) | Hadfield type manganese steel and process for the manufacture thereof |
| TW422884B (en) * | 1995-12-06 | 2001-02-21 | Wmc Resources Ltd | Mineral feed processing |
| TW555870B (en) * | 1997-07-29 | 2003-10-01 | Ugine Savoie Imphy | Austenitic stainless steel having a very low nickel content |
| TW200611977A (en) * | 2004-06-10 | 2006-04-16 | Affival | Cored wires |
| US20100000636A1 (en) * | 2006-06-16 | 2010-01-07 | Industeel Creusot | Duplex stainless steel |
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