WO2018043835A1 - 합금강 제조방법 - Google Patents
합금강 제조방법 Download PDFInfo
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- WO2018043835A1 WO2018043835A1 PCT/KR2016/014842 KR2016014842W WO2018043835A1 WO 2018043835 A1 WO2018043835 A1 WO 2018043835A1 KR 2016014842 W KR2016014842 W KR 2016014842W WO 2018043835 A1 WO2018043835 A1 WO 2018043835A1
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- alloy steel
- steel
- alloy
- molten
- manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
Definitions
- the present invention relates to a method for producing alloy steel, and more particularly, to an alloy steel manufacturing method that can suppress the temperature drop and contamination of the alloy steel.
- high manganese steel means a steel containing 1 to 5 wt% of manganese.
- high functional products such as high strength high forming steels for automobiles, have been developed, high manganese steel having an increased manganese content of about 25wt% has been produced.
- High manganese steel is manufactured by controlling the concentration of manganese by introducing a metal or an alloy containing manganese (hereinafter referred to as iron alloy) in the course of tapping the molten steel after the converter refining is completed. At this time, when the amount of ferroalloy added to the molten steel is increased, the amount of heat required to dissolve the ferroalloy is increased to increase the converter end temperature of the molten steel to secure the required amount of heat.
- iron alloy a metal or an alloy containing manganese
- the oxygen blowing amount is increased, the oxygen concentration in the molten steel is increased, and the yield of the molten steel is reduced, and the refractory of the converter is eroded by the high molten steel temperature.
- the slag amount increases due to the high dissolved oxygen amount to increase the input amount of the deoxidizer during tapping.
- the yield is reduced due to the increase in the amount of atmospheric oxidation when the ferroalloy is added by the high molten steel temperature.
- the present invention provides an alloy steel manufacturing method that can ensure the cleanliness of the alloy steel.
- the present invention provides an alloy steel manufacturing method that can improve productivity by shortening the time required for alloy steel production by omitting or shortening additional processing time.
- Alloy steel manufacturing method the process of manufacturing the first alloy steel in a thermal furnace; Maintaining the first alloy steel at a temperature equal to or higher than the melting point in the heat keeping furnace; And mixing the first alloy steel and the molten steel to produce a second alloy steel having an alloy content less than the alloy content in the first alloy steel.
- the first molten steel may include the step of introducing at least one of ferroalloy and molten ferroalloy.
- a slag layer may be formed on the hot water surface of the first alloy steel using slag.
- the process of manufacturing the first alloy steel in the thermal insulation furnace, the process of tapping the first molten steel is completed; Manufacturing a third alloy steel by injecting at least one of ferroalloy and molten ferroalloy into the first molten steel; Charging the third alloy steel into a heat retention furnace; And injecting at least one of ferroalloy and molten ferroalloy into the third alloy steel to prepare a first alloy steel having an alloy content higher than that of the alloy of the third alloy steel.
- performing at least one or more steps of injecting at least one of ferroalloy and molten ferroalloy into the first alloy steel to increase the alloy content of the first alloy steel Process may be included.
- the process of maintaining the first alloy steel at a temperature equal to or higher than the melting point may include the step of additionally charging molten steel in the thermal furnace.
- the alloy content of the first alloy steel can be controlled to have more than 25wt%, 50wt% or less.
- It may include the step of supplying a heat source to the thermal insulation furnace in at least one of the process of manufacturing the first alloy steel and maintaining the first alloy steel at a temperature above the melting point.
- the manufacturing of the second alloy steel may include: adding a fourth alloy steel prepared by injecting at least one of ferroalloy and molten ferroalloy into the second molten steel in the process of tapping the second molten steel after refining is completed.
- the alloy content of the fourth alloy steel may be less than the alloy content of the first alloy steel.
- a molten steel is charged into a thermal insulation furnace, a ferroalloy and a molten ferroalloy are added to produce a first alloy steel, and the second alloy steel having a target alloy content by combining the first alloy steel with molten steel.
- the first alloy steel may have an alloy content less than the alloy content of the molten alloy iron produced by dissolving the metal or ferroalloy and more than the alloy content of the second alloy steel. Accordingly, compared to the prior art of mixing molten alloy iron with molten steel to produce alloy steel, it is possible to suppress or prevent contamination, such as absorption, of alloy steel that may occur due to contact with the atmosphere in the process of manufacturing alloy steel.
- the subsequent process can be omitted or the time required for the subsequent process can be shortened, thereby improving productivity of the alloy steel.
- the alloy steel required for casting can be effectively provided, thereby improving casting efficiency.
- 1 is a graph showing the change of nitrogen saturation solubility according to the content of manganese in molten steel.
- Figure 2 is a flow chart showing the alloy steel manufacturing method according to the present invention.
- Figure 3 is a flow chart showing sequentially an alloy steel manufacturing method according to a modification of the present invention.
- Figure 4 is a flow chart showing sequentially an alloy steel manufacturing method according to another modified example of the present invention.
- the alloy steel manufacturing method according to the present invention by mixing the first alloy steel and molten steel having a high alloy content can produce a second alloy steel having a target alloy content. That is, unlike conventional alloy steel manufacturing method of manufacturing alloy steel by injecting solid alloy iron into molten steel, or by mixing molten alloy iron with molten steel to produce alloy steel,
- the second alloy steel can be manufactured by combining the alloy steel and molten steel.
- the first alloy steel may be manufactured in a thermal insulation furnace that is blocked from the outside to maintain the first alloy steel at a temperature equal to or higher than the melting point while suppressing contamination, for example, absorption of the first alloy steel due to contact with the atmosphere. Therefore, it is possible to secure the cleanliness of the first alloy steel to omit or shorten the subsequent process of the second alloy steel made of molten steel and molten metal, thereby reducing the overall process time can be improved productivity.
- FIG. 2 is a flow chart showing a method for manufacturing an alloy steel according to the present invention.
- the first alloy steel is a step (S110) of charging the first molten steel refined in the converter to the heat insulating furnace, and the first molten steel is heated At least one of ferroalloy and molten ferroalloy is added to the process of manufacturing the first alloy iron (S120), the process of preparing the second molten steel (S130) and by combining the first alloy steel and the second molten steel It may include a process (S140) of manufacturing the alloy steel.
- the ferroalloy may be a pure metal or an alloy, for example, a manganese metal or a manganese alloy containing manganese.
- the molten alloy iron may be prepared by melting the manganese metal or manganese alloy containing manganese in a separate melting furnace.
- the first alloy steel may contain various materials such as nickel or chromium in addition to manganese.
- manganese metal or manganese alloy is called manganese
- manganese metal or manganese alloy is described.
- the dissolved is called molten manganese.
- the first alloy steel may have a higher alloy content than the second alloy steel having a target alloy content or alloy concentration, that is, manganese content (or manganese concentration), and may have a lower alloy content than molten alloy iron.
- the manganese content in the first alloy steel may be greater than 25 wt% and less than or equal to 50 wt%.
- the upper limit of the manganese content in the first alloy steel is set to 50 wt% or less, generally referred to as alloy steel when the alloy content in the steel is 50 wt% or less, and as alloy steel when it exceeds 50 wt%. Because of the view.
- molten alloy steel having a lower manganese content than molten steel and molten steel containing 50 wt% of manganese, for example, 80 wt% of manganese is mixed with molten steel to form an alloy steel, eg, a second steel.
- the ferroalloy may be dissolved by heat of the first molten steel, or may further provide a heat source to dissolve manganese.
- the ferroalloy can be preheated and injected so that the ferroalloy can be easily dissolved by the heat of the first molten steel, and a heat source supply means such as an induction coil is provided in the thermal insulation furnace to provide a heat source necessary for manufacturing the first alloy steel. It may be provided.
- an additional heat source may or may not be provided as necessary. If an additional heat source is provided, a smaller amount of heat source may be provided than when solid manganese is added.
- the first alloy steel produced in the thermal furnace may be maintained at a temperature above the melting point inside the thermal furnace until it is mixed with the second molten steel. At this time, while maintaining the first alloy steel, the denitrification treatment may be further performed in an insulated furnace for removing nitrogen components in the first alloy steel.
- slag may be formed on the hot water surface of the first alloy steel stored in the heat retention furnace to suppress the absorption of the first alloy steel.
- the slag existing on the hot water surface of the first molten steel may be mixed with the first molten steel and charged into the insulating furnace.
- the slag is composed mainly of CaO-Al 2 O 3 , and can cover the hot water surface of the first molten steel in the heating furnace to prevent contact with the atmosphere present inside the heating furnace.
- the slag may be naturally introduced into the thermal furnace in the process of charging the first molten steel into the thermal furnace, or may be forcibly introduced to form a slag layer on the hot water surface of the first molten steel.
- the first alloy steel is manufactured by injecting manganese or molten manganese, and absorption is suppressed while the first alloy steel is maintained, so that denitrification treatment of the first alloy steel can be omitted, and further denitrification treatment time can be shortened.
- the manganese or molten manganese may be further added while maintaining the temperature of the first alloy steel at a melting point or higher in the heating furnace to gradually increase the manganese content in the first alloy steel within the above-described range.
- By gradually increasing the manganese content of the first alloy steel it is possible to reduce the amount of the first alloy steel which is later mixed with the second molten steel. Accordingly, since the amount of the second molten steel to be mixed with the first alloy steel is relatively increased, the amount of the second alloy steel required for casting can be sufficiently secured, and the time and cost required to manufacture the first alloy steel can be reduced. There is this.
- the manganese content of the first alloy steel may exceed the range presented.
- the first molten steel may be added to control the manganese content in the first alloy steel in the range shown.
- an inert gas such as argon (Ar) may be blown into the heating furnace to uniformly stir and mix the first molten steel with manganese and molten manganese.
- the first alloy steel prepared in this way may be prepared in an amount larger than one serving used for mixing, and then stored in a heat retention furnace, whereby the mixing process may be continuously performed as necessary.
- the first alloy steel may be manufactured, and the second molten steel may be manufactured for mixing with the first alloy steel while maintaining the melting point at a temperature above the melting point.
- the second molten steel may be a carbon steel in which converter refining is completed, for example, the second molten steel may contain about 0.2 to 0.4 wt% of carbon.
- the second alloy steel may be manufactured by tapping the first alloy steel stored in the thermal insulation furnace to combine the second molten steel and the first alloy steel. At this time, it is possible to adjust the ratio of the mixing of the first alloy steel and the second molten steel according to the manganese content of the target second alloy steel and the manganese content of the manufactured first alloy steel.
- the second alloy steel may be transferred to a casting facility to perform casting.
- a refinement process such as an LF process or a vacuum treatment may be performed to finely adjust the manganese content of the second alloy steel or to remove impurities from the second alloy steel.
- FIG. 3 is a flowchart sequentially showing a method of manufacturing an alloy steel according to a modified example of the present invention
- FIG. 4 is a flowchart sequentially showing a method of manufacturing an alloy steel according to another modified example of the present invention.
- a process of forming a slag layer on the hot water surface of the first alloy steel, a process of supplying a heat source to the heating furnace, and controlling the manganese concentration in the first alloy steel The process of additionally adding the first molten steel can be performed in the same manner.
- the alloy steel manufacturing method according to a modified example of the present invention, the process of manufacturing the third alloy steel outside the thermal furnace (S210), the process of charging the third alloy steel into the thermal furnace (S220), and the thermal insulation At least one of manganese and molten manganese is added to the furnace to prepare a first alloy steel (S230), to prepare a second molten steel (S240), and to combine the first alloy steel and the second molten steel to make the second alloy steel. It may include the process of manufacturing (S250).
- the alloy steel may be manufactured in almost the same manner as the above-described embodiment of the present invention in addition to the process of manufacturing the first alloy steel.
- Production of the third alloy steel may be prepared by adding at least one of manganese and molten manganese to the first molten steel to be refined.
- the first molten steel is directly loaded into the heat retaining furnace to manufacture the first alloy steel
- the modified example after the third alloy steel is manufactured outside the heat retaining furnace without charging the first molten steel into the heat retaining furnace, It can be used to make a first alloy steel.
- the third alloy steel may be manufactured to have a manganese content less than the manganese content in the first alloy steel to be produced later. This is because if the content of manganese in the third alloy steel is too high, the absorption may occur rapidly due to contact with the atmosphere.
- the manganese content of the third alloy steel may be prepared to have a range of about 0.5 to 20 wt%.
- the first alloy steel may be manufactured by further adding manganese and molten manganese in the same manner as in the embodiment, and the second alloy steel may be manufactured by combining with the second molten steel.
- the first alloy steel may be manufactured by charging the third alloy steel into a heat insulating furnace, and further adding first molten steel, manganese, and molten manganese.
- a process (S310) of charging a first molten steel into a thermal insulation furnace and adding at least one of manganese and molten manganese to the first molten steel may be performed.
- the process of manufacturing the first alloy steel (S320), the process of preparing the second molten steel (S330), the process of manufacturing the fourth alloy steel from the outside in the thermal insulation furnace (S340), the first alloy steel and the fourth alloy steel and the second It may include the step (S350) of manufacturing the second alloy steel by tapping the molten steel.
- the modified example may be performed by combining the process of additionally manufacturing and alloying the fourth alloy steel, which is manufactured externally, in the insulation furnace in the method of manufacturing the second alloy steel according to the embodiment of the present invention described above.
- the fourth alloy steel may be manufactured using the third molten steel that has been refined, and may be manufactured in almost the same manner as the above-described manufacturing of the third alloy steel.
- the fourth alloy steel may be manufactured to have a lower manganese content than that of the first alloy steel.
- the fourth alloy steel may be manufactured to have the same or similar alloy content as the third alloy steel.
- the fourth alloy steel is manufactured outside of the heat insulating furnace, the adsorption to the fourth alloy steel may occur due to contact with the atmosphere, so that the manganese content of the fourth alloy steel is controlled to be relatively low in order to suppress the absorption.
- the second alloy steel When manufacturing the second alloy steel in this way, it is not necessary to greatly increase the production amount of the first alloy steel, it is possible to reduce the time and energy required to manufacture or maintain the first alloy steel. In addition, it is possible to produce an alloy steel of high quality while avoiding the burden of increasing the content of manganese in the first alloy steel.
- the nitrogen content contained in the alloy steel was measured. As described above, when the manganese content exceeds 50wt%, it is closer to molten ferroalloy than alloy steel.
- the alloy steel of Experimental Example 1 and the alloy steel of Experimental Example 2 do not show a significant difference in manganese content as the manganese content is about 2 wt%.
- the alloy steel of Experimental Example 2 is almost half the nitrogen content than the alloy steel of Experimental Example 1. This is because in the case of Example 2 by forming a slag layer on the hot water surface of the alloy steel, the alloy steel is prevented from contacting with the atmosphere in the heat retaining furnace in the heat retaining furnace to prevent absorption.
- the molten alloy iron of Experimental Example 3 contains almost twice as much manganese content as the alloy steels of Experimental Examples 1 and 2.
- a large amount of nitrogen was introduced into the thermal insulation furnace, and it can be seen that the nitrogen contained 2 to 5 times as much as the alloy steels of Experimental Examples 1 and 2.
- Experimental Example 3 shows a high nitrogen content despite the short holding time in the thermal insulation furnace compared to Experimental Examples 1 and 2. 1 shows the saturated solubility of nitrogen in a state in which manganese steel is in contact with the atmosphere, but due to the characteristics of manganese steel, as the content of manganese increases, the saturated solubility of nitrogen rapidly increases, so that absorption occurs actively.
- the nitrogen content of the alloy steel is measured by increasing the content of the alloy, ie, manganese, in the alloy steel in the heating furnace within the range given. It was.
- alloy steel was prepared by adding manganese metal, manganese alloy iron, and molten manganese alloy iron, and the change in nitrogen content according to the amount was measured.
- the molten manganese alloy was charged, and the molten manganese alloy was added to the thermal furnace to prepare a first alloy steel having a manganese content of 49 wt%. Then, while pulling the second molten steel after the converter refining, 10 tons of manganese metal was added, and 80 tons of the first alloy steel were combined to prepare a second alloy steel. Thereafter, 5 ton of manganese metal was charged to the second alloy steel in the LF process, and the second alloy steel was controlled to have a target manganese content, such as 21.7 wt%, and then transferred to the casting facility. At this time, the time required for the transfer from the tapping of the first alloy steel and the second molten steel, that is, from the tapping of the second molten steel to the casting facility was measured as 230 minutes.
- manganese metal was added to prepare an alloy steel of which manganese content was controlled first.
- manganese was added to the alloy steel whose manganese content was controlled primarily to prepare an alloy steel having a target manganese content and transferred to the casting facility.
- the amount of manganese metal to be injected into the alloy steel in the LF process may be divided into a number of times to 15 tons, and thus the manganese metal input and the temperature rising process may be repeatedly performed several times.
- an alloy steel having a manganese content of 24.3 wt% was produced and transferred to a casting facility. At this time, the time required to transfer the molten steel to the casting facility was measured to be 361 minutes.
- the manganese metal is added and dissolved during the tapping of the converter of molten steel to manufacture alloy steel, and the manganese metal is further added to control the manganese content in the alloy steel in the LF process.
- the amount of manganese metal introduced into the alloy steel in the LF process of Experimental Example 6 is three times more than the amount of manganese metal introduced into the second alloy steel in the LF process of Experimental Example 5. Therefore, in Experimental Example 6, the manganese metal to be added to the alloy steel is divided into several times, and a process for raising the temperature of the alloy steel is performed every time the manganese metal is added. Accordingly, Experimental Example 6 has no choice but to increase the time required for the LF process, and accordingly, it takes a lot of time to provide the alloy steel used for casting.
- the nitrogen content in the alloy steel after the completion of the LF process is preferably measured in comparison with Experimental Example 5.
- the initial nitrogen content of the alloy steel before the LF process is very high, and the ability to remove it by the LF process has a limitation. The nitrogen content in the alloy steel is measured lower.
- the alloy steel manufacturing method according to the embodiment of the present invention contaminated by contact with the atmosphere by manufacturing an alloy steel having a target alloy content by combining alloy steel and molten steel having a lower alloy content than molten alloy iron.
- the absorption phenomenon can be minimized.
- the contamination of the alloy steel is minimized, thereby shortening the time required in the subsequent treatment process, for example, the LF process, thereby improving productivity by shortening the entire time taken from alloy steel manufacturing to casting.
- the casting method according to the present invention is a method of casting a casting such as cast steel using an alloy steel containing an alloy such as manganese, the alloy steel is to the atmosphere by shortening the time that the alloy steel is exposed to the atmosphere before performing casting. It can prevent contamination or temperature drop. Therefore, the present invention is used to cast the alloy steel immediately before performing the casting, the casting can be performed in a casting facility in which the casting is performed to minimize the contamination due to the temperature drop of the alloy steel or contact with the atmosphere.
- molten ferroalloy is dissolved to prepare molten ferroalloy, stored at a temperature higher than the melting point, and then mixed with molten steel immediately before casting to produce alloy steel, and used in casting to thereby produce a temperature at which alloy steel can be produced. Pollution due to drops or contact with the atmosphere can be minimized.
- the manufacture and casting of the alloy steel is performed continuously, it is possible to shorten the time required for casting after the alloy steel is manufactured, thereby excluding additional processes due to the temperature drop or contamination of the alloy steel. Therefore, it is possible to suppress the increase in cost due to additional processes and to improve the process efficiency and productivity.
- Alloy steel manufacturing method according to the present invention can ensure the cleanliness of the alloy steel to omit the subsequent process or shorten the time required for the subsequent process can improve the productivity of the alloy steel.
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Abstract
Description
구분 | 망간 함량(wt%) | 질소 함량(wt%) | 제1합금강의 보온로 내 유지 시간(시간) |
실험 예1 | 47.8 | 0.086 | 24 |
실험 예2 | 45.9 | 0.041 | 26 |
실험 예3 | 81.23 | 0.112 | 21 |
구분 | 망간 함량(wt%) | 질소 함량(wt%) |
실험 예4 | 0.4 | 0.011 |
18.3 | 0.039 | |
37.1 | 0.046 |
구분 | 망간 함량(wt%) | 질소 함량(wt%) | 생산시간(분)전로출강->연주공급 |
실험 예5 | 21.7 | 0.0091 | 230 |
실험 예6 | 24.3 | 0.0219 | 361 |
Claims (9)
- 보온로에서 제1합금강을 제조하는 과정;상기 보온로에서 상기 제1합금강을 융점 이상의 온도로 유지하는 과정;상기 제1합금강과 용강을 합탕하여 상기 제1합금강 내 합금 함량보다 적은 합금 함량을 가지는 제2합금강을 제조하는 과정;을 포함하는 합금강 제조방법.
- 청구항 1에 있어서,상기 보온로에서 제1합금강을 제조하는 과정은,상기 보온로에 제1용강을 장입하는 과정;상기 제1용강에 합금철 및 용융 합금철 중 적어도 어느 하나를 투입하는 과정을 포함하는 합금강 제조방법.
- 청구항 2에 있어서,상기 보온로에 제1용강을 장입하는 과정에서,상기 제1용강의 탕면에 위치하는 슬래그를 상기 보온로에 유입시키는 과정을 포함하고,상기 제1합금강을 융점 이상의 온도로 유지하는 과정에서,상기 슬래그를 이용하여 상기 제1합금강의 탕면에 슬래그층을 형성하는 합금강 제조방법.
- 청구항 1에 있어서,상기 보온로에서 제1합금강을 제조하는 과정은,정련이 완료된 제1용강을 출강하는 과정;상기 제1용강에 합금철 및 용융 합금철 중 적어도 어느 하나를 투입하여 제3합금강을 제조하는 과정;상기 제3합금강을 보온로에 장입하는 과정; 및상기 제3합금강에 합금철 및 용융 합금철 중 적어도 어느 하나를 투입하여 상기 제3합금강 중 합금 함량보다 많은 합금 함량을 가지는 제1합금강을 제조하는 과정;을 포함하는 합금강 제조방법.
- 청구항 3 또는 청구항 4에 있어서,상기 제1합금강을 융점 이상의 온도로 유지하는 과정에서,상기 제1합금강에 합금철과 용융 합금철 중 적어도 어느 한 가지를 투입하는 과정을 적어도 1회 이상 수행하여 상기 제1합금강 중 합금 함량을 높이는 과정을 포함하는 합금강 제조방법.
- 청구항 5에 있어서,상기 제1합금강을 융점 이상의 온도로 유지하는 과정에서,상기 보온로에 용강을 추가로 장입하는 과정을 포함하는 합금강 제조방법.
- 청구항 6에 있어서,상기 제1합금강을 융점 이상의 온도로 유지하는 과정에서,상기 제1합금강 중 합금 함량은 25wt% 초과, 50wt% 이하를 갖도록 제어하는 합금강 제조방법.
- 청구항 7에 있어서,상기 제1합금강을 제조하는 과정 및 상기 제1합금강을 융점 이상의 온도로 유지하는 과정 중 적어도 어느 하나의 과정에서 상기 보온로에 열원을 공급하는 과정을 포함하는 합금강 제조방법.
- 청구항 8에 있어서,상기 제2합금강을 제조하는 과정은,정련이 완료된 제2용강을 출강하는 과정에서 상기 제2용강에 합금철 및 용융 합금철 중 적어도 어느 하나를 투입하여 제조되는 제4합금강을 합탕하는 과정을 포함하고,상기 제4합금강 중 합금 함량은 상기 제1합금강 중 합금 함량보다 적은 합금강 제조방법.
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BR112019004016A BR112019004016A2 (pt) | 2016-08-29 | 2016-12-16 | método para produção de ligas de aço |
US16/328,906 US11441211B2 (en) | 2016-08-29 | 2016-12-16 | Method for producing alloy steel |
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US20190211425A1 (en) | 2019-07-11 |
EP3505650A1 (en) | 2019-07-03 |
BR112019004016A2 (pt) | 2019-05-21 |
KR20180024286A (ko) | 2018-03-08 |
KR101853769B1 (ko) | 2018-05-02 |
EP3505650A4 (en) | 2019-08-07 |
JP2019526708A (ja) | 2019-09-19 |
US11441211B2 (en) | 2022-09-13 |
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