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1. WO2020093710 - HIGH-PURITY ACID-RESISTANT PIPELINE STEEL SMELTING PROCESS

Publication Number WO/2020/093710
Publication Date 14.05.2020
International Application No. PCT/CN2019/093660
International Filing Date 28.06.2019
IPC
C21C 5/28 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
5Manufacture of carbon steel, e.g. plain mild steel, medium carbon steel, or cast-steel
28Manufacture of steel in the converter
C21C 7/10 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/-C21C5/118
10Handling in vacuum
C21C 7/06 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/-C21C5/118
04Removing impurities by adding a treating agent
06Deoxidising, e.g. killing
C21C 7/076 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/-C21C5/118
04Removing impurities by adding a treating agent
076Use of slags or fluxes as treating agents
C21C 7/064 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/-C21C5/118
04Removing impurities by adding a treating agent
064Dephosphorising; Desulfurising
C21C 7/00 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/-C21C5/118
CPC
C21C 2007/0093
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
0093Duplex process; Two stage processes
C21C 5/28
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
5Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel ; or stainless steel
28Manufacture of steel in the converter
C21C 7/0006
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
0006Adding metallic additives
C21C 7/06
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
04Removing impurities by adding a treating agent
06Deoxidising, e.g. killing
C21C 7/064
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
04Removing impurities by adding a treating agent
064Dephosphorising; Desulfurising
C21C 7/076
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
04Removing impurities by adding a treating agent
076Use of slags or fluxes as treating agents
Applicants
  • 南京钢铁股份有限公司 NANJING IRON & STEEL CO., LTD. [CN]/[CN]
Inventors
  • 曹余良 CAO, Yuliang
  • 周贺贺 ZHOU, Hehe
  • 吴国平 WU, Guoping
Agents
  • 南京利丰知识产权代理事务所(特殊普通合伙) NANJING LI&FENG INTELLECTUAL PROPERTY AGENCY (SPECIAL CENERAL PARTNERSHIP)
Priority Data
201811329461.808.11.2018CN
Publication Language Chinese (ZH)
Filing Language Chinese (ZH)
Designated States
Title
(EN) HIGH-PURITY ACID-RESISTANT PIPELINE STEEL SMELTING PROCESS
(FR) PROCESSUS DE FUSION D'ACIER POUR CANALISATION RÉSISTANT AUX ACIDES DE HAUTE PURETÉ
(ZH) 一种高纯净度抗酸管线钢冶炼工艺
Abstract
(EN)
The present invention relates to the technical field of metallurgy. Disclosed is a high-purity acid-resistant pipeline steel smelting process, comprising hot metal ladle-to-ladle, hot metal pretreatment, converter high-carbon and low-oxygen oxygen-remaining operation, RH furnace vacuum decarburization, RH furnace alloying and vacuum degassing, LF refining furnace carbonization prevention and quick desulphurization process, and a CCM process. By means of hot metal desulphurization and slag skimming, optimization of a converter steel-tapping and oxygen-remaining system and a slagging system, an RH furnace vacuum decarburization and alloying process, LF diffusive deoxidation, slagging and bulk deoxidation, reasonable ladle argon gas bottom-blowing control in a whole smelting process, full utilization of carbon content control and metallurgical thermodynamics and dynamic conditions of desulphurization, and the carbonization prevention and quick desulphurization process, the LF slagging and the desulphurization effects are obvious, the purity of hot metal is high, the quality of a casting blank is good, and the content of inclusions of a steel plate at a level of 1.5 is controlled to be 99% or more.
(FR)
La présente invention se rapporte au domaine technique de la métallurgie. L'invention concerne un processus de fusion d'acier pour canalisation résistant aux acides de haute pureté, comprenant des processus poche par poche de métal chauffé, de prétraitement de métal chauffé, de manœuvre dédiée à l’oxygène restant, à haute teneur en carbone et à faible teneur en oxygène en convertisseur, de décarburation sous vide en four RH, d’alliage en four RH et de dégazage sous vide, de manœuvre visant à prévenir la carbonisation en four d’affinage LF et de désulfuration rapide, et un processus CCM. Grâce à une désulfuration de métal chauffé et à l'écrémage de scories, à l'optimisation d'un système de coulée d'acier en convertisseur et d'oxygène restant et à un système de scorification, à un processus de décarburation sous vide en four RH et d'alliage, à une désoxydation par diffusion LF, à une scorification et à une désoxydation en masse, à une commande raisonnable de gonflage par la base de gaz argon de poche tout au long d’un processus de fusion, à une utilisation totale de la commande de teneur en carbone et de la thermodynamique métallurgique et des conditions dynamiques de désulfuration, et aux processus de prévention de la carbonisation et de désulfuration rapide, la scorification LF et les effets de désulfuration sont évidents, la pureté du métal chauffé est élevée, la qualité d'une ébauche de moulage est bonne, et la teneur en inclusions d'une plaque d'acier à un niveau de 1,5 est régulée afin d'être supérieure ou égale à 99 %.
(ZH)
本发明公开了一种高纯净度抗酸管线钢冶炼工艺,涉及冶金技术领域,包括铁水倒罐→铁水预处理→转炉高碳低氧留氧操作→RH炉真空脱碳→RH炉合金化及真空脱气→LF精炼炉防增碳快速脱硫工艺→CCM流程,通过铁水脱硫扒渣,转炉出钢留氧制度和造渣制度的优化,RH炉真空脱碳及合金化工艺,LF炉扩散脱氧造渣和沉淀脱氧,冶炼过程全程合理的钢包氩气底吹控制,充分发挥碳含量控制与脱硫的冶金热力学和动力学条件,防增碳快速脱硫工艺,LF炉造渣脱硫效果明显,且钢水纯净度高,铸坯质量良好,钢板1.5级以内夹杂物含量控制在99%以上。
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