KR20010062898A - Method for manufacturing tundish flux for silicon killed steel - Google Patents

Method for manufacturing tundish flux for silicon killed steel Download PDF

Info

Publication number
KR20010062898A
KR20010062898A KR1019990059642A KR19990059642A KR20010062898A KR 20010062898 A KR20010062898 A KR 20010062898A KR 1019990059642 A KR1019990059642 A KR 1019990059642A KR 19990059642 A KR19990059642 A KR 19990059642A KR 20010062898 A KR20010062898 A KR 20010062898A
Authority
KR
South Korea
Prior art keywords
steel
slag
tundish
flux
ladle
Prior art date
Application number
KR1019990059642A
Other languages
Korean (ko)
Other versions
KR100584726B1 (en
Inventor
박병곤
강봉수
정현석
Original Assignee
이구택
포항종합제철 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 이구택, 포항종합제철 주식회사 filed Critical 이구택
Priority to KR1019990059642A priority Critical patent/KR100584726B1/en
Publication of KR20010062898A publication Critical patent/KR20010062898A/en
Application granted granted Critical
Publication of KR100584726B1 publication Critical patent/KR100584726B1/en

Links

Classifications

    • 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
    • C21C7/06—Deoxidising, e.g. killing
    • 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
    • C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • 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
    • C21C2200/00—Recycling of waste material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

PURPOSE: A process for preparing a tundish flux by controlling the pouring condition of supplementary raw material in the refining process of Si deoxidized steel is provided, which can substitute conventional dundish flux(artificial slag) and enhance the index of cleanliness of steel as compared to conventional tundish flux. CONSTITUTION: In the process for manufacture of a tire steel cord comprising by weight, C:0.70 to 0.80%, Si:0.20 to 0.30%, Mn:0.70 to 0.90%, P:0.011% or less, S:0.005% and Al:0.002% or less, this process comprises the steps of: obtaining slag comprising 3 to 8kg limestone, 3 to 10kg silica and 1 to 3kg fluospar by Si deoxidizing when molten steel in a converter is tapped with a ladle and refining in the second stage; pouring molten steel in the ladle into a tundish, cooling the remaining slag; and grinding to a size of 30mm or less.

Description

Ｓｉ탈산강용 턴디쉬플럭스의 제조방법{Method for manufacturing tundish flux for silicon killed steel}Method for manufacturing tungsten flux for Si deoxidation steel {Method for manufacturing tundish flux for silicon killed steel}

본 발명은 Si탈산강용 턴디쉬플럭스에 관한 것으로, 상세하게는 Si탈산하는 타이어코드강의 정련공정을 통해 Si탈산강용 턴디쉬플럭스를 제조하는 방법에 관한 것이며, 종래의 천연자원을 별도의 제조공정으로 제조하는 인조슬래그를 대체하는 기술이다.The present invention relates to a tungsten flux for Si deoxidized steel, and more particularly, to a method for producing a tungsten flux for Si deoxidized steel through a refining process of tire deoxidized tire cord steel. It is a technology to replace the artificial slag to manufacture.

타이어 코드강은 Si탈산강의 대표적인 예이며, 그 화학조성은 아래 표 1과 같다.Tire cord steel is a representative example of Si deoxidation steel, the chemical composition is shown in Table 1 below.

화학조성(중량%)Chemical composition (% by weight) CC SiSi MnMn PP SS 산가용성 AlAcid Soluble Al 0.70∼0.800.70 to 0.80 0.20∼0.300.20 to 0.30 0.70∼0.900.70 to 0.90 ≤0.011≤0.011 ≤0.005≤0.005 ≤0.002≤0.002

이 강종은 다른 보통의 강종과 마찬가지로 도 1과 같이, 전로정련, 2차정련, 연속주조의 공정을 통해 제조된다. 전로정련은 주원료인 용선과 고철을 전로에 장입하고 순산소를 불어 넣어 주원료중 불순물을 산화에 의해 제거한다. 이 정련된 용강을 레이들로 출강하여 2차정련하는데, 이 출강중에 용강의 성분조정 및 용강탈산을 위해 Fe-Mn, Fe-Si 등의 합금철을 투입하며, 또한 불가피하게 유출되는 전로슬래그의 무해화를 위해 생석회, 인조슬래그 등을 사용한다. 2차정련된 래들내 용강은 연속주조기로 옮겨져서 턴디쉬와 몰드를 통해 슬라브, 블름, 빌렛 등 일정형태로 응고되어 주편으로 제조된다.Like other ordinary steels, this steel is manufactured through the process of converter refining, secondary refining, and continuous casting, as shown in FIG. In the converter refining process, the main raw materials such as molten iron and scrap metal are charged into the converter, and pure oxygen is blown to remove impurities from the main raw materials by oxidation. The refined molten steel is pulled out by ladle for the second refining process. During this tap, ferroalloys such as Fe-Mn and Fe-Si are added to adjust the composition of the molten steel and deoxidize the molten steel. Quicklime, artificial slag, etc. are used for harmlessness. The molten steel in the secondary refined ladle is transferred to a continuous casting machine and solidified into slabs, blocks, billets, etc., through a tundish and a mold, and manufactured into cast pieces.

상기 연속주조공정에서 용강을 주편으로 주조할때 용강을 어떻게 처리하느냐에 따라 주편의 품질은 결정된다. 턴디쉬내 용강의 청정성을 확보하기 위해 투입되는 턴디쉬플럭스 또한 이중의 하나이다. 아래 표 2에는 Si탈산강에 많이 사용되는 턴디쉬플럭스가 나타나 있다.In the continuous casting process, when casting molten steel into cast steel, the quality of the cast steel is determined by how the molten steel is treated. The tundish flux, which is applied to ensure the cleanliness of molten steel in the tundish, is one of them. Table 2 below shows the tundish fluxes used in Si deoxidized steels.

화학조성(중량%)Chemical composition (% by weight) 입도(mm)Particle size (mm) CaOCaO SiO2 SiO 2 Al2O3 Al 2 O 3 Fe2O3 Fe 2 O 3 PP SS ≤30≤30 40∼4840-48 48∼5648-56 ≤3≤3 ≤1≤1 ≤0.05≤0.05 ≤0.05≤0.05

이 턴디쉬 플럭스는 천연자원인 생석회(CaO)와 규사(SiO2) 등을 전기로에서용해시켜 만들고 있으며, 이를 인조슬래그라고도 한다. 이 인조슬래그는 Al2O3개재물 흡수능이 우수한 특성을 발휘한다. 그런데, 이 인조슬래그는 천연자원을 원료로 하여 전기로에서 별도의 공정으로 에너지를 소비하면서 제조하고 있기 때문에 제조원가가 비싸다는 단점이 있다.This tundish flux is made by melting natural resources such as quicklime (CaO) and silica sand (SiO 2 ) in an electric furnace, also known as artificial slag. This artificial slag exhibits excellent characteristics of absorbing Al 2 O 3 inclusions. However, since the artificial slag is manufactured while consuming energy in a separate process in an electric furnace using natural resources as a raw material, there is a disadvantage in that the manufacturing cost is high.

본 발명은 Si탈산강의 정련공정에서 부원료의 투입조건의 제어로 저렴하게 턴디쉬플럭스를 제조하여 종래의 턴디쉬플럭스(인조슬래그)를 대체함은 물론, 종래의 턴디쉬플럭스 보다 강의 청정도를 보다 높일 수 있는 Si탈산강용 턴디쉬플럭스의 제조방법을 제공하는데 그 목적이 있다.The present invention manufactures tungsten flux at low cost by controlling the input conditions of the subsidiary materials in the refining process of Si deoxidized steel, and replaces the conventional tundish flux (artificial slag), and also improves the cleanliness of the steel more than the conventional tundish flux. It is an object of the present invention to provide a method for producing a tungsten flux for Si deoxidized steel.

도 1은 전로정련법의 개략공정도1 is a schematic process chart of converter refining method

도 2는 타이어 코드강에 본 발명의 플럭스제조방법을 적용한 경우에 얻어지는 강의 청정도와 종래의 타이어코드강의 청정도를 비교한 그래프2 is a graph comparing the cleanliness of steel obtained by applying the flux manufacturing method of the present invention to tire cord steel and the cleanliness of conventional tire cord steel.

도 3은 본 발명과 종래의 턴디쉬플럭스별 청정성지수를 비교한 그래프Figure 3 is a graph comparing the cleanliness index according to the present invention and conventional tundish flux

상기 목적을 달성하기 위한 본 발명은, 전로정련하고 용강을 래들로 출강하여 2차정련한 다음, 턴디쉬에 주입하여 C:0.70∼0.80%, Si:0.20∼0.30%, Mn:0.70∼0.90%, P:0.011%이하, S:0.005%, Al:0.002%이하를 포함하여 조성되는 타이어코드강을 제조하는 방법에 있어서, 상기 전로의 용강을 래들로 출강할때 Si탈산하고 생석회:3∼8kg/ton-s, 규사:3∼10kg/ton-s, 형석:1∼3kg/ton-s을 첨가하여 통상의 방법으로 2차정련하여 CaO:35-42%, SiO2:33∼47%, Al2O3:5∼9%, Fe2O3:2∼4%, MgO:3∼8%로 조성되는 슬래그를 얻는 단계; 상기 2차정련한 래들내 용강을 턴디쉬로 주입하고 남은 상기 래들슬래그를 냉각하여 30mm이내로 분쇄하는단계:를 통하여 실리콘 탈산강용 플럭스를 제공한다.In order to achieve the above object, the present invention is to convert the molten steel into a ladle by refining the converter, and then injected into a tundish, C: 0.70 to 0.80%, Si: 0.20 to 0.30%, Mn: 0.70 to 0.90% In the method for producing a tire cord steel, including P: 0.01% or less, S: 0.005%, Al: 0.002% or less, Si deoxidized when tapping the molten steel of the converter ladle and quicklime: 3 ~ 8kg / ton-s, silica sand: 3-10kg / ton-s, fluorspar: 1-3kg / ton-s, and secondary refining by a conventional method to give CaO: 35-42%, SiO 2 : 33-47%, Obtaining a slag composed of Al 2 O 3 : 5 to 9%, Fe 2 O 3 : 2 to 4%, and MgO: 3 to 8%; Injecting the molten steel in the secondary refined ladle in a tundish and cooling the remaining ladle slag to crush within 30mm to provide a flux for silicon deoxidation steel.

이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.

본 발명자들은 천연 생석회와 규사를 별도의 에너지 소비공정을 통해 턴디쉬플럭스로 제조하는 종래의 방법을 개선하기 위한 일련의 연구과정에서, 강의 제조과정에서 슬래그의 조성을 턴디쉬플럭스의 조성으로 유도하면 종래의 기술한계를 극복할 수 있다는데 착안하여 본 발명을 완성하게 된 것이다. 이를 위해서는 강의 정련과정에서의 생성되는 슬래그를 최종 얻고자하는 턴디쉬플럭스의 조성으로 효과적으로 유도하면서, 용강의 품질에 별다른 영향을 미치지 않아야 한다. 따라서, 본 발명에서는 래들슬래그의 염기도(CaO/SiO2)가 약 1영역에서 관리되고 Si단독 탈산하는 타이어 코드강에 주목하게 되었다. 타이어 코드강의 강조성은 상기한 표 1과 같다.In the course of research for improving the conventional method of manufacturing natural quicklime and silica sand into tundish flux through separate energy consumption process, the present inventors induce slag composition into tundish flux composition in steel manufacturing process. The present invention has been made in light of the above technical limitations. For this purpose, the slag generated in the steel refining process should be effectively guided to the composition of the tundish flux to be finally obtained, while not affecting the quality of the molten steel. Therefore, in the present invention, attention has been paid to the tire cord steel in which the basicity (CaO / SiO 2 ) of the ladle slag is managed in about 1 region and the Si alone is deoxidized. The emphasis of the tire cord steel is shown in Table 1 above.

타이어 코드강을 제조할때 전로정련을 마친 용강을 래들로 출강할때 그 유출을 극력억제하고 있지만, 필연적으로 전로슬래그가 래들로 유출되고 있으며 그 양은 5∼15kg/ton-s로 조성은 아래 표 3과 같다.When manufacturing tire cord steel, it is suppressed when spilling molten steel that has been converted into ladle, but inevitably the converter slag is flowing out to the ladle and the amount is 5-15kg / ton-s. Same as 3.

전로슬래그의 화학성분(중량%)Chemical composition of converter slag (% by weight) CaOCaO SiO2 SiO 2 Al2O3 Al 2 O 3 T.FeT.Fe MnOMnO MgOMgO TiO2 TiO 2 SS P2O5 P 2 O 5 37.037.0 12.212.2 2.52.5 23.223.2 3.853.85 5.95.9 0.20.2 0.070.07 1.761.76

표 3과 같이 전로슬래그중에는 T.Fe 및 MnO 등의 악성산화물이 많고 염기도가 목표로 하는 조성 보다 높기 때문에 이 전로슬래그의 무해화와 목표로 하는 턴디쉬플럭스의 조성을 조절하기 위해 보통 부원료를 투입하고 있다.As shown in Table 3, since many of the malignant oxides such as T.Fe and MnO are present in the converter slag and the basicity is higher than the target composition, secondary raw materials are usually added to control the harmlessness of the converter slag and the composition of the target tundish flux. have.

본 발명에서는 이때 투입하는 부원료를 기본적으로 용강의 정련이라는 주목적에 부합하면서 턴디쉬플럭스의 조성에 준하는 슬래그조성으로 유도 할 수 있는 조건을 도출하였다. 즉, 본 발명에서는 부원료로서, 생석회: 3∼8kg/ton-s과 규사: 3∼10kg/ton-s, 형석: 1∼3kg/ton-s 투입한다. 이때, 규사 대신 CaO:40∼48중량%와 SiO2:48∼56중량%를 포함하여 조성되는 인조슬래그를 투입할 수 있다. 상기 생석회와 규사의 투입량은 통상적인 전로슬래그의 조성과 유출량(5∼15kg/ton-steel)을 감안하여 본 발명의 슬래그조성을 얻기 위하여 설정된 것이다. 한편, 투입된 부원료들은 서로 용해가 되어야 목적하는 방향으로의 반응을 유도하여 부원료들의 용해성을 높일 수 있는데, 이를 위해서는 형석의 첨가가 효과적이다. 이를 위해 형석은 1kg/ton-steel 투입하며, 3kg/ton-steel 보다 많이 첨가되면 내화물 침식 등 부작용을 초래하기 때문이다.In the present invention, the secondary raw materials introduced at this time were derived in accordance with the main purpose of the refining of molten steel, and the conditions that can lead to the slag composition corresponding to the composition of the tundish flux. That is, in this invention, as a raw material, quicklime: 3-8 kg / ton-s, silica sand: 3-10 kg / ton-s, fluorspar: 1-3 kg / ton-s is added. At this time, instead of silica sand, artificial slag including 40 to 48% by weight of CaO and 48 to 56% by weight of SiO 2 may be added. The amount of quicklime and silica sand is set in order to obtain the slag composition of the present invention in consideration of the composition and flow rate of the conventional converter slag (5 ~ 15kg / ton-steel). On the other hand, the added sub-materials should be dissolved with each other to induce a reaction in the desired direction to increase the solubility of the sub-materials, for this purpose, the addition of fluorite is effective. For this purpose, fluorspar is added to 1kg / ton-steel, and if more than 3kg / ton-steel is added, it causes side effects such as refractory erosion.

상기와 같이 부원료를 투입하고, 이후 통상의 방법으로 2차정련한다. 예로 들어, 래들에서 약 15∼40분 정도 승온을 하고, 이후 필요한 노외정련(RH)을 거친 다음, 래들내 용강을 턴디쉬로 주입한다.Subsidiary materials are added as described above, and then secondary refining is carried out by a conventional method. For example, the ladle is heated for about 15 to 40 minutes, then subjected to the required external refining (RH), and the molten steel in the ladle is injected into the tundish.

래들의 용강을 턴디쉬에 모두 주입하면 래들내에는 슬래그가 남게 되는데, 이 슬래그는 CaO:35-42%, SiO2:33∼47%, Al2O3:5∼9%, Fe2O3:2∼4%, MgO:3∼8%로 조성된다. 이 슬래그를 냉각한 다음, 턴디쉬플럭스의 용도에 맞도록 30mm이하로 분쇄한다.When all the molten steel is injected into the tundish, slag remains in the ladle, which is CaO: 35-42%, SiO 2 : 33-47%, Al 2 O 3 : 5-9%, Fe2O3: 2 ~ 4% and MgO: 3 to 8%. The slag is cooled and then crushed to 30 mm or less to suit the use of the tundish flux.

이하, 본 발명을 실시예를 통하여 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.

[실시예]EXAMPLE

표 2의 종래 턴디쉬 플럭스와 본 발명의 턴디쉬 플럭스를 적용하여 턴디쉬에 적용하여 용강을 주조하여 주편을 얻은 다음, 이 주편의 청정성지수를 측정하고 이를 도 1에 나타내었다.After applying the conventional tundish flux of Table 2 and the tundish flux of the present invention to the molten steel by applying to the tundish to obtain a cast steel, the cleanness index of the cast steel was measured and shown in FIG.

도 2에 나타난 바와 같이, 본 발명의 턴디쉬 플럭스를 적용할때가 종래의 턴디쉬플럭스 보다 청정성이 개선됨을 알 수 있었다. 한편, 도 3에는 본 발명에 따라 슬래그를 턴디쉬플럭스의 조성에 맞추어 강을 정련할 경우에 강의 청정성지수를 나타낸 것이다. 본 발명은 기존의 타이어코드강을 정련하는 방법에 비해 오히려 강의 청정도가 개선됨을 알 수 있다.As shown in Figure 2, it can be seen that when applying the tundish flux of the present invention, the cleanliness is improved than the conventional tundish flux. On the other hand, Figure 3 shows the cleanliness index of the steel when the steel is refined according to the composition of the tungsten flux slag according to the present invention. The present invention can be seen that the cleanliness of the steel is improved compared to the conventional method for refining the tire cord steel.

상술한 바와 같이, 본 발명에 따르면 타이어 코드강을 제조할때 용강의 품질에 별다른 영향을 미치지 않으면서도 슬래그의 조성을 최종 턴디쉬플럭스의 조성에 맞추어 얻을 수 있기 때문에 턴디쉬플럭스 제조를 위한 천연자원의 소모가 적고 또한 별도의 에너지를 소비하면서 만들지 않기 때문에 매우 경제적으로 턴디쉬플럭스를 제조할 수 있는 기술적 효과가 있다.As described above, according to the present invention, since the composition of the slag can be obtained according to the composition of the final tundish flux without significantly affecting the quality of molten steel when manufacturing the tire cord steel, There is a technical effect of making the tundish flux very economically because of the low consumption and no extra energy consumption.

Claims (2)

전로정련하고 용강을 래들로 출강하여 2차정련한 다음, 턴디쉬에 주입하여 C:0.70∼0.80%, Si:0.20∼0.30%, Mn:0.70∼0.90%, P:0.011%이하, S:0.005%, Al:0.002%이하를 포함하여 조성되는 타이어코드강을 제조하는 방법에 있어서,Refining the converter, tapping the molten steel into ladle, and then injecting it into a tundish and injecting it into C: 0.70 to 0.80%, Si: 0.20 to 0.30%, Mn: 0.70 to 0.90%, P: 0.011% or less, S: 0.005 In the method for producing a tire cord steel, including%, Al: 0.002% or less, 상기 전로의 용강을 래들로 출강할때 Si탈산하고 생석회:3∼8kg/ton-s, 규사:3∼10kg/ton-s, 형석:1∼3kg/ton-s을 첨가하여 통상의 방법으로 2차정련하여 CaO:35-42%, SiO2:33∼47%, Al2O3:5∼9%, Fe2O3:2∼4%, MgO:3∼8%로 조성되는 슬래그를 얻는 단계;When the molten steel of the converter is pulled into the ladle, Si is deoxidized and quicklime is added: 3 to 8 kg / ton-s, silica sand: 3 to 10 kg / ton-s and fluorspar: 1 to 3 kg / ton-s. After refining, a slag composed of CaO: 35-42%, SiO 2 : 33-47%, Al 2 O 3 : 5-9%, Fe 2 O 3 : 2-4%, MgO: 3-8% is obtained. step; 상기 2차정련한 래들내 용강을 턴디쉬로 주입하고 남은 상기 래들슬래그를 냉각하여 30mm이내로 분쇄하는 단계:를 포함하여 이루어지는 실리콘 탈산강용 플럭스의 제조방법.Injecting molten steel in the secondary refined ladle into a tundish and cooling the remaining ladle slag to pulverize it within 30 mm. 제 1항에 있어서, 상기 규사 대신 CaO:40∼48중량%와 SiO2:48∼56중량%를 포함하여 조성되는 인조슬래그를 투입함을 특징으로 하는 실리콘 탈산강용 플럭스의 제조방법.The method of manufacturing a flux for silicon deoxidation steel according to claim 1, wherein artificial slag comprising 40 to 48% by weight of CaO and 48 to 56% by weight of SiO 2 is introduced in place of the silica sand.
KR1019990059642A 1999-12-21 1999-12-21 Method for manufacturing tundish flux for silicon killed steel KR100584726B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019990059642A KR100584726B1 (en) 1999-12-21 1999-12-21 Method for manufacturing tundish flux for silicon killed steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019990059642A KR100584726B1 (en) 1999-12-21 1999-12-21 Method for manufacturing tundish flux for silicon killed steel

Publications (2)

Publication Number Publication Date
KR20010062898A true KR20010062898A (en) 2001-07-09
KR100584726B1 KR100584726B1 (en) 2006-05-30

Family

ID=19627486

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019990059642A KR100584726B1 (en) 1999-12-21 1999-12-21 Method for manufacturing tundish flux for silicon killed steel

Country Status (1)

Country Link
KR (1) KR100584726B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101366300B1 (en) * 2012-06-20 2014-02-20 주식회사 포스코 Method for refining molten steel
CN104395484A (en) * 2012-05-14 2015-03-04 Posco公司 High cleanliness molten steel production method and refining device

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100825554B1 (en) * 2001-09-14 2008-04-25 주식회사 포스코 A Method for Refining Hot Metal in a Converter with High Efficiency of Dephosphurization
KR101233836B1 (en) 2010-11-26 2013-02-15 주식회사 포스코 Tundish flux composite and Method of manufacturing the same
KR101353097B1 (en) 2011-11-15 2014-01-17 주식회사 포스코 Method for manufacturing steel for non-oriented electric steel sheet
KR101356861B1 (en) 2012-05-14 2014-01-28 주식회사 포스코 Refining device of high purity molten steel
KR101356928B1 (en) 2012-05-14 2014-01-28 주식회사 포스코 Method of manufacturing high purity molten steel and the refining device thereof
KR101356842B1 (en) 2012-05-14 2014-01-28 주식회사 포스코 Refining device of high purity molten steel and refining slag
KR101356889B1 (en) * 2012-05-14 2014-01-28 주식회사 포스코 Refining device of high purity molten steel and refining slag

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2654099B2 (en) * 1988-06-21 1997-09-17 株式会社神戸製鋼所 Manufacturing method of clean steel
KR960015800B1 (en) * 1994-09-15 1996-11-21 포항종합제철 주식회사 Tundish flux
KR100260073B1 (en) * 1996-12-16 2000-07-01 이구택 Billet making method of tire cord

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104395484A (en) * 2012-05-14 2015-03-04 Posco公司 High cleanliness molten steel production method and refining device
US9752202B2 (en) 2012-05-14 2017-09-05 Posco High cleanliness molten steel production method and refining device
KR101366300B1 (en) * 2012-06-20 2014-02-20 주식회사 포스코 Method for refining molten steel

Also Published As

Publication number Publication date
KR100584726B1 (en) 2006-05-30

Similar Documents

Publication Publication Date Title
CN108330245B (en) High-purity smelting method for stainless steel
CN102021488B (en) Steel for nuclear-island seamless steel tube and production method thereof
CN113215477B (en) Preparation method of low-carbon-emission cold-rolled base steel strip
CN103060513A (en) Method for smelting tire cord steel and method for continuously casting tire cord steel
CN105154623B (en) A kind of efficient alloyage process of melting 38CrMoAl steel
CN101220413A (en) Technique for smelting ferroferrite with sponge iron
KR100584726B1 (en) Method for manufacturing tundish flux for silicon killed steel
JP2011094210A (en) Decarbonizing method for silicochromium
CN102041355B (en) Ladle slag modifier for stainless steel refining process
CN113564447B (en) Vanadium-controlled Cr13 type hydroelectric stainless steel smelting method
KR101252644B1 (en) Flux and Method for refining molten steel by Converter
CN111424134B (en) Production method of iron-chromium-aluminum alloy continuous casting slab
CN117026092A (en) High-strength spring steel and preparation method thereof
CN110512140A (en) A kind of engineering machinery wheel steel and preparation method thereof
JPH10130714A (en) Production of steel for wire rod excellent in wire drawability and cleanliness
JP4074328B1 (en) Ladle refining method
CN114480777A (en) Method for realizing 82B high-carbon tapping of converter through double-slag method
KR100844794B1 (en) A method for refining with high purity of austenitic stainless steel
KR100215105B1 (en) Manufacturing method of high purity steel
KR101786931B1 (en) Method for refining of molten stainless steel
JP3580096B2 (en) Melting method of low Mn steel
CN117845143B (en) High-quality free-cutting die steel casting blank and preparation method thereof
CN115747407B (en) Smelting method of low-silicon aluminum killed low-carbon steel with controllable inclusions
JPH07103416B2 (en) High carbon steel wire manufacturing method
CN114107600B (en) Smelting method of 27SiMn steel containing nucleating agent

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20130513

Year of fee payment: 8

FPAY Annual fee payment

Payment date: 20140526

Year of fee payment: 9

FPAY Annual fee payment

Payment date: 20150521

Year of fee payment: 10

FPAY Annual fee payment

Payment date: 20160524

Year of fee payment: 11

LAPS Lapse due to unpaid annual fee