TWI396748B

TWI396748B - Method and smelting plant for producing steel with high manganese and low carbon content

Info

Publication number: TWI396748B
Application number: TW94142942A
Authority: TW
Inventors: Lutz Rose; Walter Weischedel
Original assignee: Sms Siemag Ag
Priority date: 2005-12-06
Filing date: 2005-12-06
Publication date: 2013-05-21

Description

製造具高錳及低碳含量的鋼的方法與熔煉設備Method and smelting equipment for producing steel with high manganese content and low carbon content

本發明有關於一種以熔化生鐵或熔化鋼和熔渣形成成分為基礎之用於製造高錳和低碳鋼的方法和熔煉設備。The present invention relates to a process and a smelting apparatus for producing high manganese and low carbon steels based on molten pig iron or molten steel and slag forming components.

具高錳含量的鋼主要是以弧爐中之廢鐵為基礎來製造者(Gigacher,Doppler,Bernard Krieger等人於「冶金論壇」Leoben,2003，發表之論文)。在製造期間，將錳載體加入以鐵合金為形式的熔化液之中。結果，問題接著產生：具低碳含量的錳鐵(FeMn)之成本為具有高碳含量之相同產物的300倍。然而，具低碳含量的FeMn係合乎最佳產生之目的者。Steels with high manganese content are mainly based on scrap iron in arc furnaces (Gigacher, Doppler, Bernard Krieger et al., paper by Leoben, 2003, Metallurgical Forum). During the manufacture, the manganese support is added to the melt in the form of an iron alloy. As a result, the problem then arises that the cost of ferromanganese (FeMn) having a low carbon content is 300 times that of the same product having a high carbon content. However, FeMn having a low carbon content is suitable for the purpose of production.

以電弧爐之外的容器來產生具高錳含量之鋼是失敗的，因為當氧注入時大量的錳將形成熔渣，這是因為當鋼進行去碳程序時氧將替錳產生較高的親和性。選用先前轉化爐路線所造成的缺點為：由於大量的錳形成熔渣之緣故，所以在鋼中形成的錳含量較低，約16-17%。It is a failure to produce a steel with a high manganese content in a container other than the electric arc furnace, because a large amount of manganese will form slag when oxygen is injected, because oxygen will produce a higher manganese for the decarburization process. Affinity. The disadvantage of using the previous reformer route is that the manganese content in the steel is relatively low, about 16-17%, due to the large amount of manganese forming slag.

在電弧爐當中產生具高錳和低碳含量之鋼的產生會有若干缺點存在：當電弧區的溫度高於3000℃時，許多錳將蒸發。因此，將需要高級和昂貴的廢鐵金屬，以確保低雜質元素的含量。另外，必須使用具低碳含量的昂貴鐵合金。The production of steel with high manganese and low carbon content in an electric arc furnace has several disadvantages: when the temperature of the arc zone is above 3000 ° C, many manganese will evaporate. Therefore, advanced and expensive scrap iron metal will be required to ensure a low impurity element content. In addition, expensive iron alloys with a low carbon content must be used.

本發明的目的在於避免先前相關於電弧爐以外之容器處理途徑所產生的缺點，在該容器當中，需使用生鐵和熔化FeMn負載，以獲得具高錳含量和最低可能碳含量的鋼。The object of the present invention is to avoid the disadvantages previously associated with the treatment of containers other than electric arc furnaces in which pig iron and melting are used. The FeMn load is applied to obtain a steel having a high manganese content and a lowest possible carbon content.

前述的目的可藉由下列程序因此獲得：製程初期，將具有約6%C的熔化錳鐵和約0.1%C的熔化鋼連同必要份量的熔渣形成成分導入FeMn精煉轉化爐之中，透過頂槍和浴底噴嘴的合併注入氧氣，碳含量降低至約0.7-0.8%，之後，來自先前熔煉製程之冷卻最終產物的一部份當作冷卻劑加入，透過底部噴嘴之氧氣的連續注入，碳含量進一步地下降至約0.5-0.1%。冷卻劑的效果以及浴物品表面之下相當低溫的碳燃燒程序之進行，將防止錳的蒸發。以FeMn carburé當作錳載體來使用，將可獲得製造具高錳含量的鋼之低成本途徑。其能夠增加錳含量至約25-30%。生鐵的使用使其更容易符合相關於銅和雜質元素含量的嚴峻需求。使得在組合式熔煉設備當中以添加物產生高錳含量鋼變得同樣是可行的。將不再需要添加包含例如銅、鋅、錫、鉬、鎢等之雜質元素。The foregoing object can be attained by the following procedure: in the initial stage of the process, molten iron having about 6% C and about 0.1% C of molten steel are introduced into the FeMn refining reformer together with the necessary amount of slag forming ingredients, through the top. The combination of the gun and the bath bottom nozzle injects oxygen, and the carbon content is reduced to about 0.7-0.8%. Thereafter, a portion of the cooled final product from the previous melting process is added as a coolant, and continuous injection of oxygen through the bottom nozzle, carbon The content is further reduced to about 0.5-0.1% underground. The effect of the coolant and the relatively low temperature carbon burning process below the surface of the bath article will prevent evaporation of the manganese. The use of FeMn carburé as a manganese carrier will provide a low cost path for the manufacture of steels with high manganese content. It is capable of increasing the manganese content to about 25-30%. The use of pig iron makes it easier to meet the stringent requirements associated with copper and impurity levels. It has also become feasible to produce high manganese content steel with additives in a combined smelting plant. It is no longer necessary to add an impurity element containing, for example, copper, zinc, tin, molybdenum, tungsten, or the like.

其同時是有利的：透過頂槍和/或浴底噴嘴，使用氧氣和氧氣-惰性氣體混合物的合併注入，分壓下降。At the same time it is advantageous to use a combined injection of oxygen and an oxygen-inert gas mixture through the top gun and/or the bottom nozzle to reduce the partial pressure.

為了保持有利的低溫，本發明所提供的所有製程步驟係以1630-1650℃之間的溫度範圍來實施。In order to maintain a favorable low temperature, all of the process steps provided by the present invention are carried out at a temperature range between 1630-1650 °C.

本方法的更進一步改善提供：添加SiMn和/或FeAl於熔化液之中，以便調整盛鋼桶精煉爐中的分析。此可促進例如TWIP(成雙誘發塑性)或TRIP(轉化誘發塑性)鋼的產生。A further improvement of the method provides for the addition of SiMn and/or FeAl to the melt in order to adjust the analysis in the ladle refining furnace. This can promote the production of, for example, TWIP (double induced plasticity) or TRIP (transformation induced plasticity) steel.

設計實用具體實施例中，將份量約380公斤含6%C(每噸鋼)之熔化FeMn75 carburé和約530公斤含0.1%C的熔化鋼導入FeMn精煉轉化爐之中，添加必要份量之熔渣形成成分，使得該熔化液含有23.3公斤的碳，此相當的碳含量為C=2.6%C，透過至少頂槍和若干底部噴嘴之合併注入氧氣，碳含量下降至約0.9%，然後約150公斤的先前熔煉操作所形成之冷卻最終產物當作冷卻劑逐漸地添加進去，最後，透過底部噴嘴，注入氧氣和惰性氣體之混合物，使得碳含量更進一步下降至0.05-0.1%。In a practical embodiment of the design, the amount of about 380 kg is 6% C (per The molten FeMn75 carburé and about 530 kg of molten steel containing 0.1% C are introduced into the FeMn refining reformer, and the necessary amount of slag is added to form a composition, so that the melt contains 23.3 kg of carbon, and the equivalent carbon content For C = 2.6% C, oxygen is injected through a combination of at least a top gun and a number of bottom nozzles, the carbon content is reduced to about 0.9%, and then about 150 kg of the cooled final product formed by the previous smelting operation is gradually added as a coolant. Finally, a mixture of oxygen and an inert gas is injected through the bottom nozzle to further reduce the carbon content to 0.05-0.1%.

配置添加熔渣形成成分和雜質元素以供應生鐵或碳鋼來產生高錳成分和低碳成分鋼的熔煉設備，使得在製程途徑中的盛鋼桶精煉爐之前的FeMn精煉轉化爐之材料流上游，在一側有SAF爐或鼓風爐和在另一側有用於碳鋼之煉鋼廠轉化爐或電弧爐被安裝。A smelting apparatus for adding a slag forming component and an impurity element to supply pig iron or carbon steel to produce a high manganese component and a low carbon component steel, so that the material flow of the FeMn refining reformer before the ladle refining furnace in the process route is upstream A SAF furnace or blast furnace on one side and a steelmaking converter or electric arc furnace on the other side for carbon steel are installed.

該等圖式所表示的本發明之具體實施例，將在下文中以更詳細的內容說明之。Specific embodiments of the invention represented by the drawings are described in greater detail below.

如圖1所示，一種以熔化生鐵2或熔化鋼3和熔渣形成成分4為基礎(同時參閱圖2當中位在此位置的熔渣層)用於產生具高錳含量和低碳含量的鋼1之方法被提供。於製程初期，將具有約6%C的熔化錳鐵5和約0.1%C的熔化鋼3或碳鋼3a連同必要份量的熔渣形成成分4導入FeMn精煉轉化爐6a之中。然後，透過至少頂槍8和浴底噴嘴9的合併注入氧氣7，碳含量降低至約0.7-0.8%。同時，先前熔煉操作之冷卻最終產物的一部份當作冷卻劑10加入。在此步驟當中，透過底部噴嘴9之氧氣7的連續注入，碳成分進一步地下降至約0.05-0.1%。As shown in Fig. 1, one is based on melting pig iron 2 or molten steel 3 and slag forming component 4 (see also the slag layer in this position in Fig. 2) for producing a high manganese content and a low carbon content. The method of steel 1 is provided. At the initial stage of the process, molten iron galvanic iron 5 having about 6% C and about 0.1% C of molten steel 3 or carbon steel 3a are introduced into the FeMn refining reformer 6a together with the necessary amount of slag forming component 4. Then, by injecting oxygen 7 through at least the combination of the top gun 8 and the bottom nozzle 9, the carbon content is reduced to about 0.7-0.8%. At the same time, a portion of the cooled final product of the previous smelting operation is added as coolant 10. In this step, the continuous injection of oxygen 7 through the bottom nozzle 9 further reduces the carbon composition to about 0.05-0.1%.

透過底部噴嘴9和頂槍8，使用氧氣7和氧氣-惰性氣體混合物11的連續注入，在熔化液中之氧的分壓可下降。所有製程步驟係以1630-1650℃之間的(低)溫度範圍來實施。By the continuous injection of the oxygen gas 7 and the oxygen-inert gas mixture 11 through the bottom nozzle 9 and the top gun 8, the partial pressure of oxygen in the molten liquid can be lowered. All process steps are carried out at a (low) temperature range between 1630-1650 °C.

添加SiMn和/或FeAl於熔化液13之中，以便調整盛鋼桶精煉爐12中的分析。SiMn and/or FeAl are added to the melt 13 to adjust the analysis in the ladle refining furnace 12.

如圖2所示，用來產生高錳含量和低碳含量鋼1的熔煉設備係與生鐵或碳鋼14供應及鋼之熔渣形成成分4和雜質元素15的添加一起操作。還原爐16(具沒入電極)或鼓風爐17用於生鐵2，或者煉鋼廠轉化爐6或電弧爐18用於碳鋼3a，此些係安置於FeMn精煉轉化爐6a之材料流上游。盛鋼桶精煉爐12係接在精煉轉化爐6a之後。As shown in Fig. 2, the smelting apparatus for producing the high manganese content and the low carbon content steel 1 is operated together with the supply of the pig iron or carbon steel 14 and the addition of the steel slag forming component 4 and the impurity element 15. The reduction furnace 16 (with electrode immersed in the electrode) or the blast furnace 17 is used for the pig iron 2, or the steelmaking plant reformer 6 or the electric arc furnace 18 is used for the carbon steel 3a, which is disposed upstream of the material flow of the FeMn refining reformer 6a. The ladle refining furnace 12 is connected after the refining reformer 6a.

配置依據本發明之方法的具體實施例：在第1步驟，將份量約380公斤含6%C(每噸鋼)之熔化FeMn75 carburé和約530公斤含0.1%C的熔化鋼及必要份量之熔渣形成成分4導入FeMn精煉轉化爐6a之中，使得該熔化液13含有23.3公斤的碳，此相當的碳含量為C=2.6%。在第2步驟，透過至少頂槍8和若干底部噴嘴9之合併注入氧氣，碳含量下降至約0.7%。在第3步驟，約150公斤(每噸鋼)的先前熔煉操作所形成之冷卻最終產物當作冷卻劑10連續地添加進去。在第4步驟，透過底部噴嘴9，注入氧氣-惰性氣體混合物11(惰性氣體具有保護噴嘴和產生擾流的功能)，使得碳含量進一步下降至約0.1%。A specific embodiment of the method according to the invention is arranged: in the first step, a portion of about 380 kg of molten FeMn75 carburé containing 6% C (per ton of steel) and about 530 kg of molten steel containing 0.1% C and the necessary amount of melting The slag forming component 4 is introduced into the FeMn refining reforming furnace 6a such that the molten liquid 13 contains 23.3 kg of carbon, and the equivalent carbon content is C = 2.6%. In the second step, oxygen is injected through the combination of at least the top gun 8 and the plurality of bottom nozzles 9, and the carbon content is reduced to about 0.7%. In the third step, a cooled final product formed by a previous smelting operation of about 150 kg (per ton of steel) is continuously added as a coolant 10. In the fourth step, an oxygen-inert gas mixture 11 is injected through the bottom nozzle 9 (the inert gas has a protective nozzle and a spoiler Function), so that the carbon content is further reduced to about 0.1%.

透過輕金屬(Si、Al及類似物)之添加，該分析(TWIP或TRIP鋼)被調整，結果，隨著Al和Si的添加，該具有高錳含量和低碳含量的鋼1也同樣可在結合型熔煉設備中產生。The analysis (TWIP or TRIP steel) is adjusted by the addition of light metals (Si, Al and the like), and as a result, with the addition of Al and Si, the steel 1 having a high manganese content and a low carbon content can also be Produced in a combined smelting equipment.

1‧‧‧具高錳和低碳含量鋼1‧‧‧High manganese and low carbon steel

2‧‧‧熔化生鐵2‧‧‧melted pig iron

3‧‧‧熔化鋼3‧‧‧melted steel

3a‧‧‧熔化碳鋼3a‧‧‧melted carbon steel

4‧‧‧熔渣形成成分4‧‧‧ slag forming ingredients

5‧‧‧熔化錳鐵5‧‧‧melted ferromanganese

6‧‧‧煉鋼廠轉化爐6‧‧‧Steelmaking plant reformer

6a‧‧‧FeMn煉製轉化爐6a‧‧‧FeMn refining reformer

7‧‧‧氧氣7‧‧‧Oxygen

8‧‧‧頂槍8‧‧‧ top gun

9‧‧‧浴底噴嘴9‧‧‧Bath bottom nozzle

10‧‧‧冷卻劑10‧‧‧ coolant

11‧‧‧氧氣-惰性氣體混合物11‧‧‧Oxygen-inert gas mixture

12‧‧‧盛鋼桶精煉爐12‧‧‧Steel drum refining furnace

13‧‧‧熔化液13‧‧‧melt

14‧‧‧生鐵或碳鋼供應14‧‧‧ Supply of pig iron or carbon steel

15‧‧‧雜質元素15‧‧‧ impurity elements

16‧‧‧還原爐(SAF)16‧‧‧Reduction Furnace (SAF)

17‧‧‧鼓風爐17‧‧‧Blast furnace

18‧‧‧電弧爐18‧‧‧Electric arc furnace

圖1係用於進料操作(上部分)和依據時間之去碳方法程序(底部分)的流程圖。Figure 1 is a flow chart for the feed operation (upper part) and the decarburization method according to time (bottom part).

圖2係具有將原料加進熔煉設備之途徑的流程圖。Figure 2 is a flow chart showing the route of adding raw materials to the smelting apparatus.

2‧‧‧熔化生鐵2‧‧‧melted pig iron

3a‧‧‧熔化碳鋼3a‧‧‧melted carbon steel

4‧‧‧熔渣形成成分4‧‧‧ slag forming ingredients

6‧‧‧煉鋼廠轉化爐6‧‧‧Steelmaking plant reformer

6a‧‧‧FeMn煉製轉化爐6a‧‧‧FeMn refining reformer

7‧‧‧氧氣7‧‧‧Oxygen

8‧‧‧頂槍8‧‧‧ top gun

9‧‧‧浴底噴嘴9‧‧‧Bath bottom nozzle

11‧‧‧氧氣-惰性氣體混合物11‧‧‧Oxygen-inert gas mixture

12‧‧‧盛鋼桶精煉爐12‧‧‧Steel drum refining furnace

14‧‧‧生鐵或碳鋼供應14‧‧‧ Supply of pig iron or carbon steel

15‧‧‧雜質元素15‧‧‧ impurity elements

16‧‧‧還原爐(SAF)16‧‧‧Reduction Furnace (SAF)

17‧‧‧鼓風爐17‧‧‧Blast furnace

18‧‧‧電弧爐18‧‧‧Electric arc furnace

Claims

一種用於以熔化生鐵(2)或熔化鋼(3)和熔渣形成成分(4)為基礎產生具高錳和低碳含量的鋼(1)之方法，其特徵在於：製程初期，將含約6%C的熔化錳鐵(5)和含約0.1%C的熔化鋼(3；3a)連同必要份量的熔渣形成成分(4)導入FeMn精煉轉化爐(6a)之中；透過頂槍(8)和浴底噴嘴(9)的合併注入氧氣(7)，使碳含量降低至約0.7-0.8%；之後，將來自先前熔煉製程之冷卻最終產物的一部份當作冷卻劑(10)加入；然後透過底部噴嘴(9)之連續注入氧氣(7)，使碳含量進一步下降至約0.05-0.1%。A method for producing steel (1) having a high manganese content and a low carbon content based on molten pig iron (2) or molten steel (3) and slag forming component (4), characterized in that: in the initial stage of the process, About 6% C of molten ferromanganese (5) and about 0.1% C of molten steel (3; 3a) together with the necessary amount of slag forming component (4) are introduced into the FeMn refining reformer (6a); (8) Combined with the bath bottom nozzle (9), oxygen (7) is injected to reduce the carbon content to about 0.7-0.8%; after that, a portion of the cooled final product from the previous melting process is used as a coolant (10). ); then continuously injecting oxygen (7) through the bottom nozzle (9) to further reduce the carbon content to about 0.05-0.1%.

如申請專利範圍第1項所述之方法，其特徵在於：藉由透過頂槍(8)和/或浴底噴嘴(9)之氧氣(7)和氧氣-惰性氣體混合物(11)的合併注入，使分壓下降。The method of claim 1, characterized in that the combined injection of oxygen (7) and oxygen-inert gas mixture (11) through the top gun (8) and/or the bottom nozzle (9) , so that the partial pressure drops.

如申請專利範圍第1或2項所述之方法，其特徵在於：所有製程步驟係以1630-1650℃之間的溫度範圍來實施。The method of claim 1 or 2, wherein all of the process steps are carried out at a temperature ranging between 1630-1650 °C.

如申請專利範圍第1或2項所述之方法，其特徵在於：將SiMn和/或FeAl添加至熔化液(13)，以便調整盛鋼桶精煉爐(12)中的分析。The method according to claim 1 or 2, characterized in that SiMn and/or FeAl is added to the melt (13) for adjusting the analysis in the ladle refining furnace (12).

如申請專利範圍第3項所述之方法，其特徵在於：將SiMn和/或FeAl添加至熔化液(13)，以便調整盛鋼桶精煉爐(12)中的分析。A method as claimed in claim 3, characterized in that SiMn and/or FeAl is added to the melt (13) for adjustment of the analysis in the ladle refining furnace (12).

如申請專利範圍第1或2項所述之方法，其特徵在於：將份量約380公斤含6%C(每噸鋼)的熔化FeMn75 carburé和份量約530公斤含0.1%C的熔化鋼導入FeMn精煉轉化爐(6a)之中；添加必要份量之熔渣形成成分(4)，使得熔化液(13)含有23.3公斤的碳，此相當於碳含量C=2.6%C；藉由透過至少一頂槍(8)和若干底部噴嘴(9)之合併注入氧氣，使碳含量下降至約0.7%；然後將約150公斤的先前熔煉操作之冷卻最終產物當作冷卻劑(10)逐漸地添加進去；藉由透過底部噴嘴(9)注入氧氣-惰性氣體混合物(11)，使碳含量進一步下降至0.05-0.1%。The method of claim 1 or 2, characterized in that the portion is about 380 kg and contains 6% C (per ton of steel). Melting FeMn75 carburé and a portion of about 530 kg of molten steel containing 0.1% C are introduced into the FeMn refining reformer (6a); adding the necessary amount of slag to form the component (4), so that the molten liquid (13) contains 23.3 kg of carbon, This corresponds to a carbon content of C = 2.6% C; by injecting oxygen through a combination of at least one top gun (8) and a number of bottom nozzles (9), the carbon content is reduced to about 0.7%; then about 150 kg of previous smelting The cooled final product of the operation is gradually added as a coolant (10); the carbon content is further lowered to 0.05-0.1% by injecting the oxygen-inert gas mixture (11) through the bottom nozzle (9).

如申請專利範圍第3項所述之方法，其特徵在於：將份量約380公斤含6%C(每噸鋼)的熔化FeMn75 carburé和份量約530公斤含0.1%C的熔化鋼導入FeMn精煉轉化爐(6a)之中；添加必要份量之熔渣形成成分(4)，使得熔化液(13)含有23.3公斤的碳，此相當於碳含量C=2.6%C；藉由透過至少一頂槍(8)和若干底部噴嘴(9)之合併注入氧氣，使碳含量下降至約0.7%；然後將約150公斤的先前熔煉操作之冷卻最終產物當作冷卻劑(10)逐漸地添加進去；藉由透過底部噴嘴(9)注入氧氣-惰性氣體混合物(11)，使碳含量進一步下降至0.05-0.1%。The method according to claim 3, characterized in that: about 380 kg of molten FeMn75 carburé containing 6% C (per ton of steel) and about 530 kg of molten steel containing 0.1% C are introduced into FeMn refining conversion. In the furnace (6a); adding the necessary amount of slag to form the component (4), so that the molten liquid (13) contains 23.3 kg of carbon, which corresponds to the carbon content C = 2.6% C; by passing at least one top gun ( 8) in combination with a plurality of bottom nozzles (9), oxygen is injected to reduce the carbon content to about 0.7%; then about 150 kg of the cooled final product of the previous smelting operation is gradually added as a coolant (10); The oxygen-inert gas mixture (11) is injected through the bottom nozzle (9) to further reduce the carbon content to 0.05-0.1%.

如申請專利範圍第4項所述之方法，其特徵在於：將份量約380公斤含6%C(每噸鋼)的熔化FeMn75 carburé和份量約530公斤含0.1%C的熔化鋼導入FeMn精煉轉化爐(6a)之中；添加必要份量之熔渣形成成分(4)，使得熔化液(13)含有23.3公斤的碳，此相當於碳含量C=2.6%C；藉由透過至少一頂槍(8)和若干底部噴嘴(9) 之合併注入氧氣，使碳含量下降至約0.7%；然後將約150公斤的先前熔煉操作之冷卻最終產物當作冷卻劑(10)逐漸地添加進去；藉由透過底部噴嘴(9)注入氧氣-惰性氣體混合物(11)，使碳含量進一步下降至0.05-0.1%。The method according to claim 4, characterized in that: about 380 kg of molten FeMn75 carburé containing 6% C (per ton of steel) and about 530 kg of molten steel containing 0.1% C are introduced into FeMn refining conversion. In the furnace (6a); adding the necessary amount of slag to form the component (4), so that the molten liquid (13) contains 23.3 kg of carbon, which corresponds to the carbon content C = 2.6% C; by passing at least one top gun ( 8) and several bottom nozzles (9) The combined injection of oxygen reduces the carbon content to about 0.7%; then about 150 kg of the cooled final product of the previous smelting operation is gradually added as a coolant (10); by injecting oxygen through the bottom nozzle (9) - The inert gas mixture (11) further reduces the carbon content to 0.05-0.1%.

如申請專利範圍第5項所述之方法，其特徵在於：將份量約380公斤含6%C(每噸鋼)的熔化FeMn75 carburé和份量約530公斤含0.1%C的熔化鋼導入FeMn精煉轉化爐(6a)之中；添加必要份量之熔渣形成成分(4)，使得熔化液(13)含有23.3公斤的碳，此相當於碳含量C=2.6%C；藉由透過至少一頂槍(8)和若干底部噴嘴(9)之合併注入氧氣，使碳含量下降至約0.7%；然後將約150公斤的先前熔煉操作之冷卻最終產物當作冷卻劑(10)逐漸地添加進去；藉由透過底部噴嘴(9)注入氧氣-惰性氣體混合物(11)，使碳含量進一步下降至0.05-0.1%。The method according to claim 5, characterized in that: about 380 kg of molten FeMn75 carburé containing 6% C (per ton of steel) and about 530 kg of molten steel containing 0.1% C are introduced into FeMn refining conversion. In the furnace (6a); adding the necessary amount of slag to form the component (4), so that the molten liquid (13) contains 23.3 kg of carbon, which corresponds to the carbon content C = 2.6% C; by passing at least one top gun ( 8) in combination with a plurality of bottom nozzles (9), oxygen is injected to reduce the carbon content to about 0.7%; then about 150 kg of the cooled final product of the previous smelting operation is gradually added as a coolant (10); The oxygen-inert gas mixture (11) is injected through the bottom nozzle (9) to further reduce the carbon content to 0.05-0.1%.

一種產生具高錳成分和低碳成分之鋼(1)的熔煉設備，其具有生鐵或碳鋼供應(14)及熔渣形成成分(4)和雜質元素(15)的添加，其特徵在於：在一側有使用於生鐵(2)的還原爐(16)或鼓風爐(17)，而用於碳鋼(3a)之煉鋼廠轉化爐(6)或電弧爐(18)則安置於FeMn精煉轉化爐(6a)之材料流上游，其後在製程途徑中接有盛鋼桶精煉爐(12)。A smelting apparatus for producing a steel (1) having a high manganese component and a low carbon component, which has a supply of a pig iron or carbon steel supply (14) and a slag forming component (4) and an impurity element (15), characterized in that: On one side there is a reduction furnace (16) or a blast furnace (17) for pig iron (2), and a steelmaking plant (6) or an electric arc furnace (18) for carbon steel (3a) is placed in FeMn refining. The material flow of the reformer (6a) is upstream, followed by a ladle refining furnace (12) in the process path.