KR20060133780A - A method of manufacturing stainless steel to reduce cr2o3 in the slag - Google Patents
A method of manufacturing stainless steel to reduce cr2o3 in the slag Download PDFInfo
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- KR20060133780A KR20060133780A KR1020050053622A KR20050053622A KR20060133780A KR 20060133780 A KR20060133780 A KR 20060133780A KR 1020050053622 A KR1020050053622 A KR 1020050053622A KR 20050053622 A KR20050053622 A KR 20050053622A KR 20060133780 A KR20060133780 A KR 20060133780A
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/005—Manufacture of stainless steel
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/54—Processes yielding slags of special composition
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Abstract
Description
도 1은 본 발명에 관한 염기도와 Cr2O3 함량과의 관계를 도시한 그래프도.1 is a graph showing the relationship between the basicity and Cr 2 O 3 content according to the present invention.
도 2은 본 발명에 관한 장입 규소함량과 Cr2O3 함량과의 관계를 도시한 그래프도.2 is a graph showing the relationship between the charged silicon content and Cr 2 O 3 content according to the present invention.
도 3은 본 발명에 관한 각 제어인자별 영향도를 평가한 그래프도.3 is a graph illustrating the evaluation of the influence of each control factor according to the present invention.
도 4는 본 발명 전 후의 Cr2O3 함량을 비교도시한 그래프도.Figure 4 is a graph showing the comparison of the content of Cr 2 O 3 before and after the present invention.
본 발명은 전기로 슬래그의 산화크롬을 저감하기 위한 400계 스테인레스강의 제조방법에 관한 것으로, 더욱 상세하게는 전기로 슬래그의 Cr2O3 를 저감하여 Cr의 회수율을 증대시키기 위한 400계 스테인레스강의 제조방법에 관한 것이다.The present invention relates to a method for producing 400-based stainless steel for reducing chromium oxide in an electric furnace slag, and more particularly, to manufacturing 400-based stainless steel for increasing Cr recovery by reducing Cr 2 O 3 in an electric furnace slag. It is about a method.
종래, 스테인레스강의 제조공정중에서 전기로 슬래그중의 페로크롬(ferro Cr)은 산소와 결합하여 Cr2O3 를 형성한다. 따라서 스테인레스강의 Cr 성분에 대한 조정이 필요한 실정이다. Conventionally, in the manufacturing process of stainless steel, ferro chromium in the furnace slag is combined with oxygen to form Cr 2 O 3 . Therefore, it is necessary to adjust the Cr component of the stainless steel.
그리고, 전기로에서 400계 스테인레스강을 제조하기 위해서는 원료로서 일반강스크랩과 페로크롬을 투입하고 고전력을 투입하여 그 열원으로 스크랩과 페로크롬을 용해시키는 작업이 필요하다. 여기에 투입된 페로크롬은 5~8%의 탄소와 2~4%의 규소(Si)를 함유하고 있어 용강의 품질에 악영향을 미치고 후공정인 정련로 공정에 조업부하를 야기시키게 되어 제거가 필요하다. 따라서 전기로에서는 산소를 취입하게 되는데 통상 6~12N㎥/ton을 용강속으로 불어넣게 된다. In order to manufacture 400-based stainless steel in an electric furnace, general steel scrap and ferrochrome are added as raw materials, and high power is input to dissolve scrap and ferrochrome as a heat source. Ferrochrome added here contains 5-8% of carbon and 2-4% of silicon (Si), which adversely affects the quality of molten steel and causes the operation load in the post-refining furnace process. . Therefore, in the electric furnace, the oxygen is blown, usually 6 ~ 12N ㎥ / ton is injected into the molten steel.
이 때 취입된 산소는 탄소와 규소의 제거와 더불어 Cr의 산화도 동반하여 Cr2O3 화 되고 슬래그중으로 포함되게 된다. 따라서 슬래그중의 Cr2O3 를 다시 환원시킬 필요성이 대두되는데, 이는 생산성 및 조업조건의 이유로 어려움이 있었다. 이를 해결하기 위한 종래의 수단으로서는 탄소분말을 슬래그중에 주입하여 환원을 유도하는 방법과 용해말기에 페로규소(Ferro-Silicon)나 Al을 투입하여 환원을 유도하는 방법이 있으나 이 또한 원가의 상승을 유발하는 원인이 된다는 문제점을 내포하고 있다.At this time, the blown oxygen is Cr 2 O 3 formed by the removal of carbon and silicon together with oxidation of Cr, and is included in slag. Therefore, there is a need to reduce Cr 2 O 3 again in the slag, which is difficult due to productivity and operating conditions. Conventional means to solve this problem is a method of inducing reduction by injecting carbon powder into the slag and a method of inducing reduction by injecting ferro-silicon or Al at the end of melting, but this also causes an increase in cost There is a problem that causes.
본 발명은 상기의 문제점을 해결하기 위하여 안출된 것으로서, 염기도 제어 및 규소함량 제어, 산소원단위 제어를 통하여 크롬산화물의 저감을 통한 크롬의 회 수율을 증대하기 위한 400계 스테인레스강의 제조방법을 제공하는 것을 목적으로 한다.The present invention has been made to solve the above problems, to provide a method for producing a 400-based stainless steel for increasing the recovery of chromium through the reduction of chromium oxide through basicity control, silicon content control, oxygen source unit control. The purpose.
본 발명은 상기의 목적을 달성하기 위하여, 전기로 슬래그의 크롬산화물을 저감하기 위한 400계 스테인레스강의 제조방법에서, 슬래그의 염기도를 1.2~1.4로 제어하고, 장입 Si을 중량% 1.2~1.4로 제어하여 슬래그중 크롬산화물을 저감하는 400계 스테인레스강의 제조방법을 제공하는 것을 특징으로 한다.In order to achieve the above object, the present invention, in the production method of 400-based stainless steel for reducing the chromium oxide of the slag in the electric furnace, the basicity of the slag is controlled to 1.2 ~ 1.4, and the charge Si is controlled by 1.2 to 1.4% by weight It is characterized by providing a manufacturing method of 400-based stainless steel to reduce the chromium oxide in the slag.
또한, 본 발명에서 산소원단위(Nm3/T)를 8~12로 제어하는 것이 바람직하다.In the present invention, the oxygen source unit (Nm 3 / T) is preferably controlled to 8 to 12.
이하 본 발명을 도면을 참조하여 더욱 상세히 설명하기로 한다.Hereinafter, the present invention will be described in more detail with reference to the drawings.
본 발명은 전기로 슬래그에서 염기도를 상향하고, 장입 규소를 상향하고, 산소원단위를 최적화하여 슬래그중 크롬 산화물을 저감하는 것을 기본 기술적 사상으로 하여, 본 발명에서의 염기도는 1.2~1.4로 제어하는 것이 바람직하다. In the present invention, the basic technical idea is to reduce the chromium oxide in the slag by increasing the basicity in the slag, the charged silicon, and optimizing the oxygen source unit, and the basicity in the present invention is controlled to 1.2 to 1.4. desirable.
도 1은 본 발명과 관련된 염기도와 Cr2O3 의 관계를 도시한 그래프도이다. 도면에서 알 수 있는 바와 같이 염기도와 Cr2O3 함량과는 직선적으로 반비례의 관계에 있고 염기도를 높일수록 Cr2O3 함량은 낮아진다. 그러나, 염기도가 너무 높을경우 슬래그의 유동성이 급격히 저하되어 전기로의 작업성이 열악하게 되어 생산성이 나빠지게 된다. 따라서, 본 발명에서의 바람직한 염기도는 1.2~1.4로 제어한다. 1 is a graph showing the relationship between basicity and Cr 2 O 3 according to the present invention. As can be seen from the figure, the basicity and the Cr 2 O 3 content is linearly inversely related, and the higher the basicity, the lower the Cr 2 O 3 content. However, if the basicity is too high, the fluidity of the slag is sharply lowered and the workability of the electric furnace is poor, resulting in poor productivity. Therefore, preferable basicity in this invention is controlled to 1.2-1.4.
또한, 본 발명에서 장입 규소는 중량%로 1.2~1.4%로 제어한다. 도 2는 장입 규소의 함량과 Cr2O3의 관계를 도시한 그래프도이다. 도 2에서 알 수 있는 바와 같이, 장입 규소의 함량이 1.1% 이하의 경우에는 Cr2O3 의 환원에 미치는 영향도가 아주 낮으며 장입 Si이 높으면 높을수록 Cr2O3 함량은 낮아지나 지나치게 높을경우(1.5% 이상) SiO2량이 증가하여 염기도를 조정하기 위해 투입되는 생석회의 량이 증가하고, 또한 슬래그의 발생량이 증가하여 슬래그 처리물량의 증가를 발생시키게 된다. 따라서 적정수준인 1.2~1.4% 로 관리하는 것이 최적이다. In addition, in the present invention, the charged silicon is controlled to 1.2 to 1.4% by weight. 2 is a graph showing the relationship between the content of charged silicon and Cr 2 O 3 . As can be seen in Figure 2, when the content of the silicon content of 1.1% or less has a very low impact on the reduction of Cr 2 O 3 and the higher the content of Si, the lower the Cr 2 O 3 content but too high In this case (more than 1.5%) the amount of SiO 2 is increased to increase the amount of quicklime added to adjust the basicity, and the amount of slag generated increases to cause an increase in the amount of slag treated. Therefore, the optimal level is 1.2 ~ 1.4%.
또한 본 발명에서 산소원단위는 8~12N㎥/Ton으로 제어한다. 산소는 상기에서도 언급한 바와 같이 원료중의 탄소와 규소를 제거하기 위해 필수적으로 취입해야 하나 너무 원단위가 높을 경우 Cr의 산화가 많아지고 너무 낮을 경우 용강의 교반력이 부족하여 용해시간이 길어지거나 부분적으로 미용해물이 잔존할 가능성이 높다. 도 3은 본 발명에서의 산소원단위의 제어범위가 8~12N㎥/Ton이 가장 최적의 조건인것을 보여주고 있다. In the present invention, the oxygen source unit is controlled to 8 ~ 12N ㎥ / Ton. As mentioned above, oxygen must be blown in order to remove carbon and silicon in the raw materials, but if the raw unit is too high, oxidation of Cr increases, and if it is too low, the melting time of the molten steel is insufficient and the dissolution time is long or partial. As a result, there is a high possibility that cosmetic seafood remains. Figure 3 shows that the control range of the oxygen source unit in the present invention is the most optimal condition is 8 ~
하기의 표 1은 본 발명의 주요 제어인자로서 염기도, 장입 규소, 산소원단위를 비교예와 대비한 실험결과표이고 각 인자에 대한 영향도와 최적범위는 언급한 바와 같이 도 3에 도시하였다.Table 1 below is an experimental result table comparing the basicity, charged silicon, and oxygen source unit with the comparative example as the main control factors of the present invention, and the influence and optimum range for each factor are shown in FIG. 3 as mentioned.
상기의 표 1은 염기도와 장입 규소함량 그리고 산소원단위의 변화에 따른 Cr2O3 의 함량변화를 실험계획법을 이용하여 관찰한 계획결과표이다. 염기도의 경우는 1.0, 1.2, 1.4 각 3가지의 변화를 주고 장입 규소는 1.0, 1.2, 1.4로 산소원단위는 8, 9, 10의 경우를 측정하였다. 측정결과 도 3에서 보는바와 같이 염기도의 경우는 1.4에서 장입 규소의 경우는 1.4 그리고 산소원단위는 9N㎥/Ton에서 가장 양호한 결과를 나타내었다. Table 1 above is a plan result table that observes the change of Cr 2 O 3 content according to the change of basicity, charged silicon content and oxygen source unit using the experimental design method. In the case of basicity, three changes of 1.0, 1.2, and 1.4 were carried out, respectively, and the loaded silicon was 1.0, 1.2, and 1.4, and the oxygen source units were measured at 8, 9, and 10, respectively. As shown in FIG. 3, the best results were found in 1.4 for basicity, 1.4 for loaded silicon, and 9N㎥ / Ton for oxygen source unit.
도 4는 본 발명에 따른 염기도와 장입 규소함량의 제어 및 산소원단위의 제어를 통하여 Cr2O3 함량의 변화를 비교도시한 도면이다. 도면에서 알 수 있는 바와 같이 본 발명에 따른 염기도, 장입 규소함량의 최적 제어를 통하여 슬래그중 Cr2O3 함량을 저감하여 Cr의 회수율을 증대시킬 수 있다.4 is a view showing a comparison of the change in Cr 2 O 3 content through the control of the basicity and the silicon content and the oxygen source unit according to the present invention. As can be seen in the figure, the optimality of the basicity and the silicon content of the silicon according to the present invention can increase the recovery rate of Cr by reducing the Cr 2 O 3 content in the slag.
상술한 바와 같이, 본 발명에 의한 염기도 제어, 장입 규소 제어 및 산소원단위 최적화를 통하여 전기로 슬래그중의 크롬 산화물의 저감을 통한 크롬의 회수 율을 증대시킬 수 있는 효과가 있다.As described above, it is possible to increase the recovery rate of chromium by reducing the chromium oxide in the furnace slag through the basicity control, the charge silicon control, and the oxygen source unit optimization according to the present invention.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102809561A (en) * | 2012-08-17 | 2012-12-05 | 山西太钢不锈钢股份有限公司 | Method for rapidly judging AOD (argon oxygen decarburization) reductive effect |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102809561A (en) * | 2012-08-17 | 2012-12-05 | 山西太钢不锈钢股份有限公司 | Method for rapidly judging AOD (argon oxygen decarburization) reductive effect |
| CN102809561B (en) * | 2012-08-17 | 2015-08-05 | 山西太钢不锈钢股份有限公司 | A kind of method determining AOD reduction effect fast |
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