KR102581522B1 - Rapid alloying process of high manganese austenitic steel for low temperature use - Google Patents

Rapid alloying process of high manganese austenitic steel for low temperature use Download PDF

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KR102581522B1
KR102581522B1 KR1020227036492A KR20227036492A KR102581522B1 KR 102581522 B1 KR102581522 B1 KR 102581522B1 KR 1020227036492 A KR1020227036492 A KR 1020227036492A KR 20227036492 A KR20227036492 A KR 20227036492A KR 102581522 B1 KR102581522 B1 KR 102581522B1
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steel
molton
temperature
alloying
container
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KR20220154813A (en
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위리앙 차오
구이청 저우
광펀 위엔
구어핑 우
판 지아
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난징 아이론 앤드 스틸 컴퍼니 리미티드
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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
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/34—Blowing through the bath
    • 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
    • C21C7/072—Treatment with gases
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/22—Rotary drums; Supports therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

저온용 고(高) 망간 오스테나이트강(austenitic steel)의 급속 합금화 공정은 망간 합금 베이킹→회전로 출강과 출강 합금화→LF 슬래깅(slagging) 합금화를 포함하며, 상세하게, (1) 몰튼 스틸 컨테이너(molten steel container)의 컨테이너 연령이 전기에 놓여있는 몰튼 스틸 컨테이너를 준비하는 단계; (2) 몰튼 스틸 컨테이너 지지부재를 준비하고, 베이킹할 망간 합금을 몰튼 스틸 컨테이너의 내부로 수송하는 단계; (3) 몰튼 스틸 컨테이너의 합금을 베이킹하는 단계; (4) 회전로의 출강량과 출강 온도를 제어하는 단계; (5) LF 정련로가 승온해 합금화하는 과정; (6) LF 정련로가 대량의 아르곤가스하에서 교반하고 강온해 합금화를 실시하는 과정을 포함한다. 상기 합금화 공정은 고 망간 오스테나이트강의 망간 합금화 시간을 8시간에서부터 3시간 미만으로 단축시켜 생산효율과 용강 품질을 향상시킨다.The rapid alloying process of high manganese austenitic steel for low temperature includes manganese alloy baking → rotary furnace tapping and steel casting alloying → LF slagging alloying, in detail: (1) Molton Steel container Container age of (molten steel container) Preparing a molten steel container placed in the electric; (2) preparing a Molton Steel container support member and transporting the manganese alloy to be baked into the interior of the Molton Steel container; (3) baking the alloy in a Molten steel container; (4) controlling the tapping amount and tapping temperature of the rotary furnace; (5) LF refining furnace temperature-elevating alloying process; (6) The LF refining furnace involves the process of alloying by stirring and lowering the temperature under a large amount of argon gas. The alloying process improves production efficiency and molten steel quality by shortening the manganese alloying time of high manganese austenitic steel from 8 hours to less than 3 hours.

Description

저온용 고(高) 망간 오스테나이트강의 급속 합금화 공정Rapid alloying process of high manganese austenitic steel for low temperature use

본 발명은 저온용 고(高) 망간 오스테나이트강(austenitic steel)의 급속 합금화 공정에 관한 것이다.The present invention relates to a process for rapid alloying of high manganese austenitic steel for low temperature use.

저온용 고(高) 망간 오스테나이트강(austenitic steel)(15% ≤[Mn]≤30%)은 용강의 망간 함유량이 높고 망간이 쉽게 산화되어 고철과 함께 회전로에 첨가할 수 없고, 회전로 출강과 LF정련과정을 통해 망간의 합금화를 진행할 수 밖에 없므르로, 망간의 합금화 시간(8시간 이상)이 길어지고, 생산효율이 낮아 연속 주조 생산에 불리하며; 또한, 장시간의 LF로 합금화는 쉽게 용강의 수소 및 질소 가스 함량이 높아지도록 하고, 연속 주조하는 블랭크(blank)의 품질에 대해 비교적 큰 영향을 미친다. 고 망간 오스테나이트강(15% ≤[Mn]≤30%)의 생산효율을 향상하고 연속 주조하는 블랭크의 품질을 향상하기 위해, 회전로 제련으로 저온 고 망간 오스테나이트강 급속 합금화 제강 공정을 제공하는 것은 시급히 해결해야 하는 문제이다.Low-temperature high manganese austenitic steel (15% ≤ [Mn] ≤ 30%) has a high manganese content in molten steel, and manganese is easily oxidized, so it cannot be added to the rotary furnace along with scrap iron. Since alloying of manganese has no choice but to proceed through steel tapping and LF refining processes, the alloying time of manganese is long (more than 8 hours) and production efficiency is low, which is disadvantageous for continuous casting production; In addition, alloying with long-term LF easily increases the hydrogen and nitrogen gas content of molten steel and has a relatively large impact on the quality of blanks for continuous casting. In order to improve the production efficiency of high manganese austenitic steel (15% ≤ [Mn] ≤ 30%) and improve the quality of blanks for continuous casting, a low-temperature high manganese austenitic steel rapid alloying steelmaking process is provided by rotary furnace smelting. This is a problem that needs to be resolved urgently.

본 발명은 상기 종래기술의 결함을 해결하기 위해 창출된 것으로, 그 목적은, 상기 기술문제를 해결함으로써, 고(高) 망간 오스테나이트강(austenitic steel)의 망간 합금 시간을 8시간에서부터 3시간 미만으로 단축시키고 생산효율과 용강 품질을 향상시켜 저온용 고 망간 오스테나이트강의 급속 합금화를 실현하는 저온용 고 망간 오스테나이트강의 급속 합금화 공정을 제공하는 데 있다.The present invention was created to solve the deficiencies of the prior art, and its purpose is to solve the above technical problems, thereby reducing the manganese alloying time of high manganese austenitic steel from 8 hours to less than 3 hours. The purpose is to provide a rapid alloying process for high manganese austenitic steel for low temperature use, which shortens the process and improves production efficiency and molten steel quality to realize rapid alloying of high manganese austenitic steel for low temperature use.

본 발명이 상기 기술문제를 해결하는 기술방안은 저온용 고(高)망간 오스테나이트강의 급속 합금화 공정이며, 망간 합금 베이킹→회전로 출강과 출강 합금화→LF 슬래깅(slagging) 합금화를 포함하며, 상세하게 아래 단계를 포함한다.The technical solution of the present invention to solve the above technical problem is a rapid alloying process of high manganese austenitic steel for low temperature use, and includes manganese alloy baking → rotary furnace tapping and steel casting alloying → LF slagging alloying, in detail. It includes the steps below:

1. 망간 합금 베이킹:1. Manganese alloy baking:

(1) 몰튼 스틸 컨테이너(molten steel container)의 컨테이너 연령이 전기에 놓여 있는 몰튼 스틸 컨테이너를 준비하며;(1) Prepare the molten steel container, the container age of the molten steel container is placed in the first half;

(2) 격자판을 용접해 몰튼 스틸 컨테이너의 바닥과 직경 크기가 동일한 지지부재를 제작하고, 제작된 지지부재를 몰튼 스틸 컨테이너의 바닥부에 놓고; 그 다음, 베이킹할 망간 합금을 몰튼 스틸 컨테이너의 내부로 첨가하고, 상기 망간 합금의 첨가량은 230-260Kg/t 스틸이고, 첨가량은 몰튼 스틸 컨테이너 용적의 4분의 3을 초과하지 않으며;(2) Fabricating a support member with the same diameter as the bottom of the Molton steel container by welding the grid, and placing the fabricated support member on the bottom of the Molton steel container; Then, the manganese alloy to be baked is added into the interior of the Molton steel container, the addition amount of the manganese alloy is 230-260Kg/t steel, and the addition amount does not exceed three quarters of the volume of the Molton steel container;

(3) 준비된 망간 합금이 담겨진 몰튼 스틸 컨테이너를 정상적으로 제조라인에 투입되는 몰튼 스틸 컨테이너의 베이킹 작업위치에 설치해 베이킹을 시작하고, 베이킹 화염 온도는 1000℃까지 조절하고, 베이킹 시간은 24시간 이상이며;(3) The Molton steel container containing the prepared manganese alloy is installed at the baking work position of the Molton steel container normally input into the manufacturing line to start baking, the baking flame temperature is adjusted to 1000°C, and the baking time is at least 24 hours;

2. 회전로 출강과 출강 합금화:2. Rotary furnace tapping and steel alloying:

(1) 베이킹된 합금의 몰튼 스틸 컨테이너를 회전로 출강 작업위치까지 들어 옮기고, 몰튼 스틸 컨테이너의 하취(bottom blown)를 연결해 통하게 하고, 몰튼 스틸 컨테이너의 하취를 개방해 출강을 진행하고, 이의 출강량=표준 몰튼 스틸 컨테이너의 용강 적재 중량-베이킹한 망간 합금의 중량-1/3*표준 몰튼 스틸 컨테이너의 용강 적재 중량이고, 회전로 출강 온도는 1660℃ 내지 1700℃이고, 출강 시간은 3 내지 5min이며;(1) Lift and move the baked alloy Molton steel container to the rotary furnace tapping work position, connect the bottom blow of the Molton steel container to communicate, open the bottom blow of the Molton steel container to proceed with steel tapping, and proceed with tapping. = molten steel loading weight of a standard Molton steel container - weight of baked manganese alloy - 1/3 * molten steel loading weight of a standard Molton steel container, the rotary furnace tapping temperature is 1660°C to 1700°C, and the tapping time is 3 to 5 min. ;

3. LF 슬래깅 합금화:3. LF slagging alloying:

(1) LF 정련로가 승온해 합금화하는 과정:(1) The process of LF refining furnace heating and alloying:

LF 정련로의 전극이 가열되어 승온하고, 유량이 400 내지 500NL/min인 대량의 아르곤가스하에서 교반해 탈황하고, 대량의 아르곤가스하에서 교반, 가열 및 승온해 합금화를 실시하고, 용강 온도를 1580℃ 내지 1600℃까지 높이고, 승온시간은 60분이상이며;The electrode of the LF refining furnace is heated to raise the temperature, desulfurizes by stirring under a large amount of argon gas with a flow rate of 400 to 500 NL/min, alloying is performed by stirring, heating, and raising the temperature under a large amount of argon gas, and the molten steel temperature is 1580°C. to 1600°C, and the temperature increase time is 60 minutes or more;

(2) LF 정련로가 대량의 아르곤가스하에서 교반하고 강온해 합금화를 실시하는 과정:(2) The process in which the LF refining furnace carries out alloying by stirring and lowering the temperature under a large amount of argon gas:

용강 온도를 1580℃ 내지 1600℃까지 높인 후, 승온 조작을 정지하고, 몰튼 스틸 컨테이너의 하취 아르곤가스 유량을 600NL/min까지 조정하고, LF 정련로의 몰튼 스틸 컨테이너의 소형 로(爐) 덮개를 내려놓고, 대량 아르곤가스에서의 교반 강온 조작을 진행하고, 용강 온도가 1480℃까지 내려간 후, 합금화 작업을 완성하고, 대량 아르곤가스에서의 교반을 정지하고, 몰튼 스틸 컨테이너의 하취 아르곤가스 유량을 50-80NL/min까지 조정해 계속 15분 동안 교반하고, 연속 주조 작업위치까지 들어 옮겨 주조작업을 진행하고, 대량 아르곤가스하에 교반 및 강온하는 과정에서 견본을 추출해 온도를 측정하고, 추출한 견본에 근거해 용강의 성분 상황을 분석하고, 스틸 품목이 요구하는 성분 범위보다 작을 경우, 합금을 첨가해 용강의 성분을 미세 조정하고, 점진적으로 용강 성분을 스틸 품목이 요구하는 성분 범위 내로 조정한다.After increasing the molten steel temperature to 1580℃ to 1600℃, stop the temperature increase operation, adjust the argon gas flow rate of the Molton steel container to 600NL/min, and lower the small furnace cover of the Molton steel container of the LF refining furnace. Then, a stirring temperature lowering operation is performed in a large amount of argon gas, and after the molten steel temperature is lowered to 1480°C, the alloying operation is completed, the stirring in a large amount of argon gas is stopped, and the argon gas flow rate of the Molton steel container is adjusted to 50-50°C. Adjust to 80NL/min and continue stirring for 15 minutes, lift and move to the continuous casting work position, and proceed with casting. Samples are extracted during the stirring and temperature lowering process under a large amount of argon gas, the temperature is measured, and the molten steel is made based on the extracted samples. Analyze the composition of the steel item, and if it is smaller than the composition range required by the steel item, add alloy to fine-tune the composition of the molten steel, and gradually adjust the composition of the molten steel to within the composition range required by the steel item.

본 발명의 더 한정된 방안은 아래와 같다.A more limited solution of the present invention is as follows.

상기 준비된 몰튼 스틸 컨테이너의 컨테이너 연령은 총 컨테이너 연령의 3분의 1 전이다.The container age of the prepared Molton Steel container is one-third of the total container age.

상술한 바와 같이, 망간 합금이 몰튼 스틸 컨테이너에 첨가된 후, 망간 합금의 상면에는 한 층의 제강용 석회를 첨가하고, 석회 첨가량은 8-10 Kg/t스틸이다.As described above, after the manganese alloy is added to the Molten steel container, a layer of lime for steelmaking is added to the upper surface of the manganese alloy, and the amount of lime added is 8-10 Kg/t steel.

상술한 바와 같이, 베이킹된 합금의 몰튼 스틸 컨테이너를 회전로 출강 작업위치까지 들어 옮기고, 몰튼 스틸 컨테이너의 하취를 연결해 통하게 하는 데 있어서, 몰튼 스틸 컨테이너의 하취 유량은 600내지 800Nl/min이다.As described above, when the baked alloy Molton steel container is lifted and moved to the rotary furnace tapping work position and the lower pipe of the Molton steel container is connected and communicated, the lower discharge flow rate of the Molton steel container is 600 to 800 Nl/min.

상술한 바와 같이, 대량의 아르곤가스하에서 교반 및 강온하는 과정은 석회를 여러 번으로 나누어 첨가해 강온이 빨라지도록 하고, 매번 한번에 석회를 1.5Kg/t 첨가하고, 강온과정의 총 첨가량은 6Kg/t보다 많지 않다.As described above, in the process of stirring and lowering temperature under a large amount of argon gas, lime is added in several portions to speed up temperature lowering. 1.5Kg/t of lime is added at a time each time, and the total addition amount during the temperature lowering process is 6Kg/t. not more than

본 발명은 아래의 유익한 효과를 이룬다. 본 발명은 몰튼 스틸 컨테이너(molten steel container)를 작동하기 전에 미리 적절한 합금량, 적합한 베이킹 온도, 베이킹 시간과 베이킹 배치(batch)에 대한 공정 제어를 진행하는 동시에,회전로 출강 온도와 LF 합금화 공정을 최적화하여 LF 정련로 합금화 시간을 대폭 단축함으로써, LF 정련로 합금화 시간을 9시간에서부터 3시간으로 단축시키고, LF 정련로가 장시간 승온하고 합금화를 실시해 용강의 기체 함량이 증가되는 확률을 낮추어 연속 생산을 보장할 뿐만 아니라, 제품 품질도 향상시킨다.The present invention achieves the following beneficial effects. The present invention is to control the appropriate alloy amount, suitable baking temperature, baking time and baking batch in advance before operating the molten steel container, and at the same time control the rotary furnace tapping temperature and LF alloying process. By optimizing and drastically shortening the alloying time in the LF refining furnace, the alloying time in the LF refining furnace is shortened from 9 hours to 3 hours, and the probability that the gas content of the molten steel increases due to the LF refining furnace heating and alloying for a long time is reduced, enabling continuous production. Not only does it guarantee, but it also improves product quality.

실시예 1Example 1

본 실시예는 150t의 회전로, 150톤의 LF 정련로 제련, 25Mn의 스틸 품목을 선택해 저온용 고(高) 망간 오스테나이트강(austenitic steel)의 급속 합금화 공정을 제공하며,This embodiment provides a rapid alloying process for low-temperature high manganese austenitic steel by selecting a 150-ton rotary furnace, 150-ton LF refining furnace smelting, and 25 Mn steel items,

망간 합금 베이킹→회전로 출강과 출강 합금화→LF 슬래깅(slagging) 합금화의 공정과정을 포함하며, 상세하게 아래 단계를 포함한다.It includes the process of manganese alloy baking → rotary furnace tapping and steel alloying → LF slagging alloying, and includes the steps below in detail.

1. 망간 합금 베이킹:1. Manganese alloy baking:

(1) 몰튼 스틸 컨테이너(molten steel container) 준비: 몰튼 스틸 컨테이너의 총 컨테이너 연령은 100로(爐)이고, 컨테이너 연령이 19로(爐)인 23호 몰튼 스틸 컨테이너를 선택해 합금 베이킹의 몰튼 스틸 컨테이너로 이용하며;(1) Preparation of molten steel container: The total container age of the molten steel container is 100 ro, and the No. 23 molten steel container with a container age of 19 ro is selected to prepare the molten steel container of alloy baking. It is used as;

(2) 직경이 10mm인 보통 철근을 용접해 몰튼 스틸 컨테이너의 바닥 직경 크기의 지지부재를 2개 제작하고, 제작된 지지부재를 몰튼 스틸 컨테이너의 바닥부에 놓고; 그 다음, 35톤의 금속 망간 합금을 첨가하고, 그 다음, 몰튼 스틸 컨테이너의 내부로 1.5톤의 제강용 석회를 첨가해 몰튼 스틸 컨테이너 내부의 상층에 가까운 망간 합금이 화염에 베이킹되어 연화되는 것을 방지하며;(2) Fabricate two support members the size of the bottom diameter of the Molton steel container by welding ordinary reinforcing bars with a diameter of 10 mm, and place the fabricated support members on the bottom of the Molton steel container; Next, 35 tons of metallic manganese alloy is added, and then 1.5 tons of steelmaking lime is added to the inside of the Molton Steel container to prevent the manganese alloy near the top layer inside the Molton Steel container from baking and softening in the flame. and;

(3) 준비된 금속 망간과 석회가 담겨진 몰튼 스틸 컨테이너를 정상적으로 제조라인에 투입되는 몰튼 스틸 컨테이너의 베이킹 작업위치에 설치해 베이킹을 시작하고, 베이킹 화염 온도를 1000℃까지 조절해 베이킹을 진행하고, 합금의 베이킹 시간은 27시간이며;(3) The Molton steel container containing the prepared metal manganese and lime is installed in the baking work position of the Molton steel container that is normally put into the manufacturing line to start baking. The baking flame temperature is adjusted to 1000°C to proceed with baking, and the alloy is Baking time is 27 hours;

2. 회전로 출강과 출강 합금화:2. Rotary furnace tapping and steel alloying:

(1) 27시간 베이킹되고 금속 망간이 담겨진 몰튼 스틸 컨테이너를 회전로 출강 작업위치까지 들어 옮기고, 베이킹된 합금의 온도는 708℃이고, 몰튼 스틸 컨테이너의 하취(bottom blown)를 연결해 통하게 하고, 몰튼 스틸 컨테이너의 하취 유량은 800Nl/min이고, 몰튼 스틸 컨테이너의 하취를 개방해 출강을 진행하고, 이의 출강량=150톤-35톤-1/3*150톤=100톤이고, 회전로 출강 온도는 1668℃이고, 출강 시간은 3min이며;(1) The Molton Steel container baked for 27 hours and containing the metal manganese is lifted and moved to the rotary furnace tapping work position. The temperature of the baked alloy is 708°C. The bottom blown of the Molton Steel container is connected to communicate, and the Molton Steel container is connected to the molten steel container. The unloading flow rate of the container is 800Nl/min, the lowering of the Molton Steel container is opened and steel tapping is performed, the tapping amount = 150 tons - 35 tons - 1/3 * 150 tons = 100 tons, and the rotary furnace tapping temperature is 1668. ℃, tapping time is 3min;

3. LF 슬래깅 합금화:3. LF slagging alloying:

(1) LF 정련로가 승온해 합금화하는 과정：(1) The process of LF refining furnace heating and alloying:

LF 정련로의 전극이 가열되어 승온하고, 견본울 추출하며, 상세한 내용은 표 1을 참조한다. 대량의 아르곤가스하에서 교반해 탈황하고, 몰튼 스틸 컨테이너의 하취를 연결해 통하게 하고，아르곤가스의 유량은 500NL/min이고, 대량의 아르곤가스하에서 교반, 가열 및 승온해 77분간 동안 합금화를 실시하고, 용강 온도는 1593℃이며;The electrode of the LF refining furnace is heated, the temperature is raised, and the sample is extracted. For details, see Table 1. Desulfurization is carried out by stirring under a large amount of argon gas, the bottom of the Molton steel container is connected and passed through, the flow rate of argon gas is 500 NL/min, and alloying is carried out for 77 minutes by stirring, heating and raising the temperature under a large amount of argon gas, and the molten steel is The temperature is 1593°C;

(2) LF 정련로가 대량의 아르곤가스하에서 교반하고 강온해 합금화를 실시하는 과정:(2) The process in which the LF refining furnace carries out alloying by stirring and lowering the temperature under a large amount of argon gas:

용강 온도를 1583℃까지 높인 후, 승온 조작을 정지하고, 몰튼 스틸 컨테이너의 하취 아르곤가스 유량을 600NL/min까지 조정하고, LF 정련로의 몰튼 스틸 컨테이너의 소형 로(爐) 덮개를 내려놓고, 공기를 차단해 2차 산화를 방지할 수 있고, 아르곤가스에서의 교반 강온 조작을 진행하고, 대량 아르곤가스하에서의 교반 및 강온 과정은 2개의 배치로 나누어 석회를 첨가해 강온이 빨라지도록 하고, 매번 한번에 1.5Kg/t의 석회를 첨가해 용강 온도가 1487℃까지 내려가도록 하는 데 65분이 걸리고, 합금화 작업을 완성하고, 대량 아르곤가스하에서의 교반을 정지하고, 몰튼 스틸 컨테이너의 하취 아르곤가스 유량을 50NL/min까지 조정하고, 15분 동안 계속 교반하고, 연속 주조 작업위치까지 들어 옮겨 주조를 진행하며, 대량 아르곤가스하에서의 교반 및 강온 과정에서 견본을 추출해 온도를 측정하며, 상세한 내용은 표 1을 참조한다.After raising the molten steel temperature to 1583℃, stop the temperature increase operation, adjust the argon gas flow rate of the Molton Steel container to 600 NL/min, lower the small furnace cover of the Molton Steel container of the LF refining furnace, and remove the air. secondary oxidation can be prevented by blocking, and the stirring and temperature lowering operation is carried out under argon gas. The stirring and temperature lowering process under a large amount of argon gas is divided into two batches and lime is added to speed up the temperature lowering, and each time, 1.5 times at a time. It takes 65 minutes to add Kg/t of lime to lower the molten steel temperature to 1487℃, complete the alloying operation, stop stirring under large argon gas, and increase the argon gas flow rate of Molton steel container to 50NL/min. Adjust, continue stirring for 15 minutes, lift and move to the continuous casting work position and proceed with casting. Samples are extracted and temperature measured during the stirring and temperature lowering process under a large amount of argon gas. Refer to Table 1 for details.

표 1: LF 슬래깅(slagging) 합금화 과정의 온도 및 망간 성분Table 1: Temperature and manganese composition during LF slagging alloying process.

본 실시예의 25Mn 생산에서 첨가해 베이킹하는 합금은 35톤이고, 베이킹 시간은 27시간이고, 베이킹 후 온도는 708℃이며; LF 정련로가 승온해 망간 합금화를 실시하는 과정은 시간이 77분이고, 온도는 1583℃까지 오르고, 승온이 종료되면 용강의 망간 함량이 23.04%이며; LF 정련도가 대량의 아르곤가스하에서 교반 및 강온해 망간 합금화를 실시하는 시간은 65분이고, 온도는 1587℃까지 내려가며, 강온이 종료되면 용강의 망간 함량이 23.41%이고, 스틸 품목의 성분 요구를 만족시키고, LF로 합금화의 총 시간은 142분으로 제어해 생산효율을 대폭 향상시킨다.In the production of 25Mn in this example, the alloy added and baked is 35 tons, the baking time is 27 hours, and the temperature after baking is 708°C; The process of manganese alloying by raising the temperature in the LF refining furnace takes 77 minutes, the temperature rises to 1583°C, and at the end of the temperature raising, the manganese content of the molten steel is 23.04%; The time for LF refining to alloy manganese by stirring and lowering temperature under a large amount of argon gas is 65 minutes, and the temperature is lowered to 1587℃. When the lowering temperature is completed, the manganese content of the molten steel is 23.41%, and the component requirements for steel items are met. The total alloying time with LF is controlled to 142 minutes, greatly improving production efficiency.

본 발명은 상기 실시예 외에도, 다른 실시방식이 존재할 수 있으며, 균등 치환 또는 등가적 변환을 이용해 형성된 기술방안은 모두 본 발명이 청구하는 보호범위에 포함되어야 할 것이다.In addition to the above embodiments, the present invention may have other implementation methods, and all technical solutions formed using equivalent substitution or equivalent transformation should be included in the scope of protection claimed by the present invention.

Claims (5)

저온용 고(高) 망간 오스테나이트강의 급속 합금화 공정에 있어서,
망간 합금 베이킹→회전로 출강과 출강 합금화→LF 슬래깅(slagging) 합금화를 포함하며, 구체적으로,
1단계. 망간 합금 베이킹:
(1-1단계) 몰튼 스틸 컨테이너(molten steel container)의 컨테이너 연령이 전기에 놓여 있는 몰튼 스틸 컨테이너를 준비하며;
(1-2단계) 격자판을 용접해 몰튼 스틸 컨테이너의 바닥과 직경 크기가 동일한 지지부재를 제작하고, 제작된 지지부재를 몰튼 스틸 컨테이너의 바닥부에 놓고; 그 다음, 베이킹할 망간 합금을 몰튼 스틸 컨테이너의 내부로 첨가하고, 상기 망간 합금의 첨가량은 230-260Kg/t 스틸이고, 첨가량은 몰튼 스틸 컨테이너 용적의 4분의 3을 초과하지 않으며; 망간 합금이 몰튼 스틸 컨테이너에 첨가된 후 망간 합금의 상면에는 한 층의 제강용 석회를 첨가하여 몰튼 스틸 컨테이너 내부의 상층에 가까운 망간 합금이 화염에 베이킹되어 연화되는 것을 방지하도록 하고;
(1-3단계) 준비된 망간 합금이 담겨진 몰튼 스틸 컨테이너를, 정상적으로 제조라인에 투입되는 몰튼 스틸 컨테이너의 베이킹 작업위치에 설치해 베이킹을 시작하고, 베이킹 화염 온도는 1000℃까지 조절하고, 베이킹 시간은 24시간 이상이며;
2단계. 회전로 출강과 출강 합금화:
베이킹된 합금의 몰튼 스틸 컨테이너를 회전로 출강 작업위치까지 들어 옮기고, 몰튼 스틸 컨테이너의 하취(bottom blown)를 연결해 통하게 하고, 몰튼 스틸 컨테이너의 하취를 개방해 출강을 진행하고, 이의 출강량은 아래 계산식에 의해 이루어지며, 회전로 출강 온도는 1660℃ 내지 1700℃이고, 출강 시간은 3 내지 5min이며;
출강량 = 표준 몰튼 스틸 컨테이너의 용강 적재 중량 - 베이킹한 망간 합금의 중량 - (1/3)*표준 몰튼 스틸 컨테이너의 용강 적재 중량
3단계. LF 슬래깅 합금화:
(3-1단계) LF 정련로가 승온해 합금화하는 과정:
LF 정련로의 전극이 가열되어 승온하고, 유량이 400 내지 500NL/min인 대량의 아르곤가스하에서 교반해 탈황하고, 몰튼 스틸 컨테이너의 하취를 연결해 통하게 하고, 아르곤가스의 유량은 500NL/min이며, 대량의 아르곤가스하에서 교반, 가열 및 승온해 합금화를 실시하고, 용강 온도를 1580℃ 내지 1600℃까지 높이고, 승온시간은 60분이상이며;
(3-2단계) LF 정련로가 대량의 아르곤가스하에서 교반하고 강온해 합금화를 실시하는 과정:
용강 온도를 1580℃ 내지 1600℃까지 높인 후, 승온 조작을 정지하고, 몰튼 스틸 컨테이너의 하취 아르곤가스 유량을 3-1단계의 아르곤가스의 유량보다 많은 600NL/min까지 조정하고, LF 정련로의 몰튼 스틸 컨테이너의 소형 로(爐) 덮개를 내려놓고, 대량 아르곤가스에서의 교반 강온 조작을 진행할 때 석회를 여러 번으로 나누어 첨가해 강온이 빨라지도록 하고, 용강 온도가 1480℃까지 내려간 후, 합금화 작업을 완성하고, 대량 아르곤가스에서의 교반을 정지하고, 몰튼 스틸 컨테이너의 하취 아르곤가스 유량을 50-80NL/min까지 조정해 계속 15분 동안 교반하고, 연속 주조 작업위치까지 들어 옮겨 주조작업을 진행하고, 대량 아르곤가스하에 교반 및 강온하는 과정에서 견본을 추출해 온도를 측정하고, 추출한 견본에 근거해 용강의 성분 상황을 분석하고, 스틸 품목이 요구하는 성분 범위보다 작을 경우, 합금을 첨가해 용강의 성분을 미세 조정하고, 점진적으로 용강 성분을 스틸 품목이 요구하는 성분 범위 내로 조정하는 것을 포함하는 것을 특징으로 하는 저온용 고 망간 오스테나이트강의 급속 합금화 공정.In the rapid alloying process of high manganese austenitic steel for low temperature use,
It includes manganese alloy baking → rotary furnace tapping and steel casting alloying → LF slagging alloying, specifically,
Level 1. Manganese alloy baking:
(Step 1-1) Prepare a molten steel container, the container age of which is placed in the electric phase;
(Step 1-2) Welding the grid to manufacture a support member with the same diameter size as the bottom of the Molton steel container, and placing the manufactured support member on the bottom of the Molton steel container; Then, the manganese alloy to be baked is added into the interior of the Molton steel container, the addition amount of the manganese alloy is 230-260Kg/t steel, and the addition amount does not exceed three quarters of the volume of the Molton steel container; After the manganese alloy is added to the molten steel container, a layer of steelmaking lime is added to the upper surface of the manganese alloy to prevent the manganese alloy near the upper layer inside the molten steel container from baking in the flame and softening;
(Steps 1-3) The Molton steel container containing the prepared manganese alloy is installed in the baking work position of the Molton steel container that is normally input into the manufacturing line to start baking. The baking flame temperature is adjusted to 1000°C, and the baking time is 24°C. It is more than time;
Step 2. Rotary furnace tapping and steel alloying:
The baked alloy Molton steel container is lifted and moved to the rotary furnace tapping work position, the bottom blown of the Molton steel container is connected to communicate, and the bottom blown of the Molton steel container is opened to proceed with tapping. The amount of steel tapped is calculated using the formula below. It is achieved by, the rotary furnace tapping temperature is 1660°C to 1700°C, and the steel tapping time is 3 to 5 min;
Tap weight = molten steel loading weight of a standard Molton steel container - weight of baked manganese alloy - (1/3)*molten steel loading weight of a standard Molton steel container
Step 3. LF slagging alloying:
(Step 3-1) The process of alloying by raising the temperature of the LF refining furnace:
The electrode of the LF refining furnace is heated and the temperature is raised, stirred and desulfurized under a large amount of argon gas with a flow rate of 400 to 500 NL/min, and the bottom of the Molton steel container is connected and passed through. The flow rate of argon gas is 500 NL/min and a large amount of argon gas is desulfurized. alloying is carried out by stirring, heating, and raising the temperature under argon gas, raising the molten steel temperature to 1580°C to 1600°C, and the temperature raising time is 60 minutes or more;
(Step 3-2) The process in which the LF refining furnace carries out alloying by stirring and lowering the temperature under a large amount of argon gas:
After increasing the molten steel temperature to 1580°C to 1600°C, the temperature increase operation is stopped, the flow rate of argon gas taken out of the Molton steel container is adjusted to 600 NL/min, which is higher than the flow rate of argon gas in stage 3-1, and the Molton gas flow rate of the LF refining furnace is adjusted to 600 NL/min. Put down the cover of the small furnace of the steel container, and when performing the stirring and temperature reduction operation in large argon gas, lime is added in several portions to speed up the temperature reduction. After the molten steel temperature falls to 1480℃, alloying work is performed. Upon completion, the stirring in the large amount of argon gas is stopped, the argon gas flow rate of the Molton steel container is adjusted to 50-80 NL/min, and the stirring is continued for 15 minutes, then lifted to the continuous casting work position and casting work is performed. During the process of stirring and cooling under a large amount of argon gas, a sample is extracted and the temperature is measured. The composition of the molten steel is analyzed based on the extracted sample. If the composition is less than the required range for the steel item, an alloy is added to change the composition of the molten steel. A process for rapid alloying of high manganese austenitic steel for low temperature service, comprising fine-tuning and gradually adjusting the molten steel composition to within the composition range required for the steel article. 제1항에 있어서,
상기 준비된 몰튼 스틸 컨테이너의 컨테이너 연령은 총 컨테이너 연령의 3분의 1 전인 것을 특징으로 하는 저온용 고 망간 오스테나이트강의 급속 합금화 공정.According to paragraph 1,
A rapid alloying process of high manganese austenitic steel for low temperature, characterized in that the container age of the prepared Molton steel container is before one-third of the total container age. 제1항에 있어서,
(1-2단계)에서,
망간 합금의 상면에 한 층의 제강용 석회를 첨가할 때, 석회 첨가량은 8-10 Kg/t스틸인 것을 특징으로 하는 저온용 고 망간 오스테나이트강의 급속 합금화 공정.According to paragraph 1,
In (steps 1-2),
A rapid alloying process of high manganese austenitic steel for low temperature, characterized in that when adding a layer of lime for steelmaking to the upper surface of the manganese alloy, the amount of lime added is 8-10 Kg/t steel. 제1항에 있어서,
2단계에서, 몰튼 스틸 컨테이너의 하취 유량은 600내지 800Nl/min인 것을 특징으로 하는 저온용 고 망간 오스테나이트강의 급속 합금화 공정.According to paragraph 1,
In the second stage, a rapid alloying process of high manganese austenitic steel for low temperature, characterized in that the lowering flow rate of the Molton steel container is 600 to 800 Nl/min. 제1항에 있어서,
(3-2단계)에서 대량 아르곤가스에서의 교반 강온 조작을 진행할 때 석회를 여러 번으로 나누어 첨가해 강온이 빨라지도록 하는 과정은, 매번 한번에 석회를 1.5Kg/t 첨가하고, 강온과정의 총 첨가량은 6Kg/t보다 많지 않은 것을 특징으로 하는 저온용 고 망간 오스테나이트강의 급속 합금화 공정.According to paragraph 1,
In (step 3-2), when performing the stirring temperature reduction operation in large argon gas, lime is added in several portions to speed up temperature reduction. 1.5Kg/t of lime is added each time, and the total addition amount in the temperature reduction process is 1.5kg/t. Rapid alloying process of high manganese austenitic steel for low temperature use, characterized in that the silver is not more than 6Kg/t.
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