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WO2018014752A1 - Procédé de production pour déphosphoration à l'extérieur d'un four d'acier fondu - Google Patents

Procédé de production pour déphosphoration à l'extérieur d'un four d'acier fondu Download PDF

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Publication number
WO2018014752A1
WO2018014752A1 PCT/CN2017/092404 CN2017092404W WO2018014752A1 WO 2018014752 A1 WO2018014752 A1 WO 2018014752A1 CN 2017092404 W CN2017092404 W CN 2017092404W WO 2018014752 A1 WO2018014752 A1 WO 2018014752A1
Authority
WO
WIPO (PCT)
Prior art keywords
furnace
molten steel
smelting
lime
steel
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2017/092404
Other languages
English (en)
Chinese (zh)
Inventor
周志立
彭光辉
王凯
李春远
丁广友
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tangshan Zhengfeng Iron&steel Co ltd
Original Assignee
Tangshan Zhengfeng Iron&steel Co ltd
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 Tangshan Zhengfeng Iron&steel Co ltd filed Critical Tangshan Zhengfeng Iron&steel Co ltd
Publication of WO2018014752A1 publication Critical patent/WO2018014752A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C21C7/064—Dephosphorising; Desulfurising

Definitions

  • the invention relates to a dephosphorization production process outside a molten steel furnace, in particular to a dephosphorization production process outside an electric furnace steelmaking furnace, and belongs to the technical field of electric furnace steelmaking production in the metallurgical industry.
  • Phosphorus is easily segregated at the grain boundary of steel to cause cold brittleness of steel, which can significantly reduce the low temperature impact properties of steel. It is therefore considered a harmful component in most steel grades. How to reduce phosphorus to the limit at low cost has always been the direction of steel workers.
  • the medium frequency induction furnace is a green short-flow smelting equipment with high efficiency, low energy consumption and low emission of scrap steel resources. However, because it does not have the thermodynamic and dynamic conditions for removing phosphorus, it greatly limits the expansion of smelting varieties.
  • the phosphorus content of high-quality steel is generally controlled at ⁇ 0.025%, and some requirements are ⁇ 0.015% or even lower. Therefore, in today's market economy, how to reduce the phosphorus content in molten steel to the target content at a low cost, enterprises can have a competitive advantage.
  • the medium-frequency furnace induction furnace is the center of the short-flow enterprise, smelting low-phosphorus high-quality steel, currently through the matching
  • the dephosphorization electric arc furnace is carried out, so that the cost of smelting steel per ton will increase by 120-150 yuan/ton, making the enterprise products uncompetitive and difficult to survive. Therefore, it is necessary to seek an economical and effective means of dephosphorization outside the furnace, which is the basis for the survival of the short-flow steelmaking process centered on the intermediate frequency induction furnace.
  • the phosphorus content is reduced to the target value, which has high promotion value for such high efficiency, low energy consumption, low emission, green short process enterprises.
  • the object of the present invention is to provide a dephosphorization production process outside the molten steel furnace.
  • the phosphorus content in the molten steel can be reduced to the target content at a low cost by optimizing the production process and the blowing process. Solve the problems in the background art.
  • a process for dephosphorization outside the molten steel furnace comprising the following process steps:
  • a. Gun position 200 to 1000 mm from the bottom of the ladle;
  • blowing speed 10 ⁇ 100kg / min;
  • V the percentage of the target phosphorus content
  • G weight of molten steel, unit: tons
  • Oxygen blowing flow rate 1 ⁇ 10m 3 / min;
  • Oxygen injection volume calculated according to the following formula
  • V the percentage of the target phosphorus content
  • the lime particle size in the step (2) is 200 mesh or more, and the mass percentage of the CaO content in the lime is more than 85%.
  • the molten steel refined by the LF furnace or the VD furnace is cast into a steel billet by full-protection casting, low-heating and constant-speed drawing steel for rolling steel production.
  • the comprehensive cost of dephosphorization and smelting outside the furnace is 15 to 35 yuan/ton of steel, which is 115 yuan/ton of steel lower than that by using an electric arc furnace for dephosphorization.
  • the invention has the beneficial effects that the phosphorus content in the molten steel can be reduced to the target content at a low cost by optimizing the production process and the blowing process on the basis of ensuring the performance of the steel and the quality of the product.
  • a process for dephosphorization outside the molten steel furnace comprising the following process steps:
  • a. Gun position 200 to 1000 mm from the bottom of the ladle;
  • blowing speed 10 ⁇ 100kg / min;
  • V the percentage of the target phosphorus content
  • G weight of molten steel, unit: tons
  • Oxygen blowing flow rate 1 ⁇ 10m 3 / min;
  • Oxygen injection volume calculated according to the following formula
  • V the percentage of the target phosphorus content
  • the lime particle size in the step (2) is 200 mesh or more, and the mass percentage of the CaO content in the lime is more than 85%.
  • the molten steel refined by the LF furnace or the VD furnace is cast into a steel billet by full-protection casting, low-heating and constant-speed drawing steel for rolling steel production.
  • the process of dephosphorization outside the molten steel furnace includes the following process steps:
  • the lime spray gun The lime spray gun:
  • blowing speed 30kg / min
  • the lime has a particle size of 200 mesh or more, and the mass percentage of CaO content in the lime is more than 85%.
  • a. gun position 1250mm from the liquid surface
  • Oxygen injection flow rate 3m 3 /min
  • the percentage of chemical composition of molten steel after the end of the refining process is the following:
  • CaO-SiO 2 -CaF 2 slag system is adopted. After the molten steel enters the heating position, argon is stirred, and 600Kg of lime, 100Kg of fluorite and the first batch of alloy material (900kg of silicomanganese alloy, 250kg of high carbon manganese iron) are added in two batches. 30 kg of silicon carbide powder, 35 kg of ferrosilicon powder (dispersed), and a reduced electrode heating slag. When the slag is added for 4 minutes, the amount of lime and fluorite is added, and the slag is further added. After the slag is finished, the temperature is measured and sampled. The slag is used to observe the deoxidation of the slag.
  • the ferro-smelting of the ladle slag is supplemented with ferrosilicon powder and carbonization. Silicon powder; then according to the S content of molten steel and the slag condition, the amount of slag added can be appropriately adjusted.
  • the ladle slag is controlled to be light grayish white or white
  • the amount of the alloy is added according to the content of the steel element in the station, and heating is continued to the target temperature; Calcium water treatment and argon blowing operation: After the end of heating, the argon gas flow rate is adjusted to soft argon (the strength is slightly blown to the molten steel surface but not the steel flower).
  • the ladle car was sampled after soft blowing of argon for 3 minutes, and the silicon calcium line was 100-150 m/furnace (150-200 m/furnace in the furnace).
  • the silicon calcium wire feed speed is 2.5 to 3.0 m/s. It is required to feed the silicon calcium wire and softly blow argon for 3 to 5 minutes.
  • the tensile strength is 530 MPa
  • the yield strength is 435 MPa
  • the elongation is 32%
  • the 20°C impact toughness is 105 J, which fully meets the standard requirements.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

La présente invention concerne un procédé de production pour déphosphoration à l'extérieur d'un four d'acier fondu, comprenant les étapes de procédé suivantes : (1) fusion dans un four à induction à moyenne fréquence : ajout de ferailles d'acier dans un four à induction à moyenne fréquence pour fusion, le point final de fusion étant que les composants chimiques en pourcentage en masse sont C : 0,05 à 0,30 % et P : ≤ 0,050 %, et la température de l'acier fondu est de 1550 à 1650 ºC ; et (2) déphosphoration et fusion à l'extérieur du four : coulée de l'acier fondu dans une poche, et soufflage de l'acier fondu au moyen d'une lance d'injection de chaux et d'une lance à oxygène, le débit d'injection de la lance d'injection de chaux étant de 10 à 100 kg/min, la quantité d'injection de chaux (kg) étant (la teneur en phosphore en % au point final de fusion de la fusion dans le four à induction à moyenne fréquence - une teneur en phosphore cible en %) * 100 * 3,4 * le poids de l'acier fondu, et le débit d'injection d'oxygène est de 1 à 10 m3/min. Le procédé peut réduire la teneur en phosphore dans l'acier fondu à la teneur cible à un coût faible au moyen de l'optimisation du processus de production et du processus d'injection.
PCT/CN2017/092404 2016-07-22 2017-07-10 Procédé de production pour déphosphoration à l'extérieur d'un four d'acier fondu Ceased WO2018014752A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610578571.2 2016-07-22
CN201610578571.2A CN106011381B (zh) 2016-07-22 2016-07-22 一种钢水炉外脱磷生产工艺

Publications (1)

Publication Number Publication Date
WO2018014752A1 true WO2018014752A1 (fr) 2018-01-25

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Country Link
CN (1) CN106011381B (fr)
WO (1) WO2018014752A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111079537A (zh) * 2019-11-18 2020-04-28 中冶赛迪技术研究中心有限公司 转炉冶炼工况的识别方法、系统、机器可读介质及设备
CN112795726A (zh) * 2020-12-25 2021-05-14 中航上大高温合金材料有限公司 一种钢包精炼炉及其脱磷方法
CN114292985A (zh) * 2022-01-07 2022-04-08 鞍钢股份有限公司 一种转炉出钢后磷含量高的处理方法
CN115261709A (zh) * 2022-08-11 2022-11-01 山西太钢不锈钢股份有限公司 超低温压力容器钢及其冶炼方法
CN116162762A (zh) * 2022-12-29 2023-05-26 北京首钢自动化信息技术有限公司 一种基于机器视觉的扒渣臂参数调整方法及系统
CN116377172A (zh) * 2023-03-19 2023-07-04 新疆八一钢铁股份有限公司 一种转炉高效脱磷的操作方法
CN118853998A (zh) * 2024-07-05 2024-10-29 成都冶金实验厂有限公司 一种新型材料在短流程电炉炼钢加入方法

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* Cited by examiner, † Cited by third party
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CN106011381B (zh) * 2016-07-22 2018-04-24 唐山正丰钢铁有限公司 一种钢水炉外脱磷生产工艺
CN111663018B (zh) * 2020-05-29 2022-02-01 中天钢铁集团有限公司 一种钢包脱磷方法

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CN1074712A (zh) * 1991-12-24 1993-07-28 川崎制铁株式会社 精炼高纯度钢的方法
CN101535508A (zh) * 2006-12-05 2009-09-16 住友金属工业株式会社 超低硫高清净钢的熔炼方法
CN102094100A (zh) * 2011-03-18 2011-06-15 武汉钢铁(集团)公司 铁水脱磷剂及其应用方法
CN106011381A (zh) * 2016-07-22 2016-10-12 唐山正丰钢铁有限公司 一种钢水炉外脱磷生产工艺

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WO2014112432A1 (fr) * 2013-01-18 2014-07-24 Ｊｆｅスチール株式会社 Procédé de fabrication d'acier au convertisseur
CN104955965B (zh) * 2013-01-24 2017-09-22 杰富意钢铁株式会社 铁水的预处理方法
CN104152632B (zh) * 2014-06-19 2016-01-13 中国科学院金属研究所 一种中频炉冶炼炉外脱磷的方法
CN205382186U (zh) * 2016-03-09 2016-07-13 唐山正丰钢铁有限公司 一种炉外钢水脱磷处理系统

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Publication number Priority date Publication date Assignee Title
CN1074712A (zh) * 1991-12-24 1993-07-28 川崎制铁株式会社 精炼高纯度钢的方法
CN101535508A (zh) * 2006-12-05 2009-09-16 住友金属工业株式会社 超低硫高清净钢的熔炼方法
CN102094100A (zh) * 2011-03-18 2011-06-15 武汉钢铁(集团)公司 铁水脱磷剂及其应用方法
CN106011381A (zh) * 2016-07-22 2016-10-12 唐山正丰钢铁有限公司 一种钢水炉外脱磷生产工艺

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111079537A (zh) * 2019-11-18 2020-04-28 中冶赛迪技术研究中心有限公司 转炉冶炼工况的识别方法、系统、机器可读介质及设备
CN111079537B (zh) * 2019-11-18 2023-09-26 中冶赛迪技术研究中心有限公司 转炉冶炼工况的识别方法、系统、机器可读介质及设备
CN112795726A (zh) * 2020-12-25 2021-05-14 中航上大高温合金材料有限公司 一种钢包精炼炉及其脱磷方法
CN114292985A (zh) * 2022-01-07 2022-04-08 鞍钢股份有限公司 一种转炉出钢后磷含量高的处理方法
CN115261709A (zh) * 2022-08-11 2022-11-01 山西太钢不锈钢股份有限公司 超低温压力容器钢及其冶炼方法
CN115261709B (zh) * 2022-08-11 2023-08-18 山西太钢不锈钢股份有限公司 超低温压力容器钢及其冶炼方法
CN116162762A (zh) * 2022-12-29 2023-05-26 北京首钢自动化信息技术有限公司 一种基于机器视觉的扒渣臂参数调整方法及系统
CN116377172A (zh) * 2023-03-19 2023-07-04 新疆八一钢铁股份有限公司 一种转炉高效脱磷的操作方法
CN118853998A (zh) * 2024-07-05 2024-10-29 成都冶金实验厂有限公司 一种新型材料在短流程电炉炼钢加入方法

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CN106011381B (zh) 2018-04-24

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