EP0163784A1 - Procédé de désoxydation d'acier en deux étapes - Google Patents

Procédé de désoxydation d'acier en deux étapes Download PDF

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Publication number
EP0163784A1
EP0163784A1 EP84303555A EP84303555A EP0163784A1 EP 0163784 A1 EP0163784 A1 EP 0163784A1 EP 84303555 A EP84303555 A EP 84303555A EP 84303555 A EP84303555 A EP 84303555A EP 0163784 A1 EP0163784 A1 EP 0163784A1
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EP
European Patent Office
Prior art keywords
steel
molten steel
ladle
silicon
partially
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.)
Granted
Application number
EP84303555A
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German (de)
English (en)
Other versions
EP0163784B1 (fr
Inventor
Maw-Cheng Shieh
Seng-Jung Chen
Li-Jung Hu
Jin-Luh Su
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.)
China Steel Corp
Original Assignee
China Steel Corp
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 China Steel Corp filed Critical China Steel Corp
Priority to DE8484303555T priority Critical patent/DE3480350D1/de
Priority to EP84303555A priority patent/EP0163784B1/fr
Priority to AT84303555T priority patent/ATE47727T1/de
Priority to ZA852015A priority patent/ZA852015B/xx
Priority to AU40220/85A priority patent/AU567212B2/en
Publication of EP0163784A1 publication Critical patent/EP0163784A1/fr
Application granted granted Critical
Publication of EP0163784B1 publication Critical patent/EP0163784B1/fr
Expired legal-status Critical Current

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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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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

Definitions

  • This invention concerns with Weak Pre-deoxictation practice in steelmaking. Adding Si contained ferroalloy during tapping stage as weak pre-deoxidation practice, this new practice could achieve lower production cost and high quality steel products. For rimmed steel production very mino addition of deoxidizer results in higher freo oxygen contain in molten rimmed steel, which would react with solute element in molten steel, a solid skin layer around the ingot surface is formed. i
  • the deoxidizer (Al, Si, Ti, Mn) added during tapping process is oxidized by the free oxygen in molten steel.
  • the reaction is shown below:
  • the fully killed molten steel could be casted continuous casting process.
  • the production yield and internal quality of the continuous caated products is superior than that of ingot.
  • Lower recovery rate and higher addition amount of deoxidizer for fully killed steel causes higher production costs and results in the residual of deoxidizing formations remained in steel.
  • Such residual deoxidation formations is harmful to processing formability while the Weak Pre-deoxidation process could vanish the defects stated above and provides lower cost higher clenniness and higher quality steel products.
  • alumina cluster (A1 2 0 3 ) forms in molten steel and remains in solid steel as inclusion, which could not be elongated during deformation, thus interfere the cold heading or working formability.
  • the objective of this new process stated above is to overcome the shortness of deoxidation practice, that is to reduce work hardening effect.
  • any Si contained ferroalloy could not be added during steelmaking.
  • Such deoxidation concept is modified by this new deoxidation process, during tapping (of top blowing furnace, bottom blowing furnace, top and bottom combined blowing furnace or electric arc furnace) appropriate amount of S i contained ferroalloy could be added in the condition of no Si remained in molten steel.
  • Free oxygen content of the molten steel in ladle could be reduced as Si contained ferroalloy added then the ladle is transferred to Al-wire feeder system or ladle injection treating station to proceed the final stage deoxidatio: with Al and/or Ti killing, or other composition adjustment.
  • This new process will increase the recovery rate of deoxidizer, decrease the amount of deoxidizer and ferroalloy consumption and save production cost. Because of less deoxidizer and alloy addition, deoxidized formations could be reduced that would remarkably improve the internal cleaniness of the steel products.
  • the major premise of this invention is to add Si contained ferro- alloy as weak pre-deoxidation process with the furance (such as top blowing type, botton blowing type, top and bottom combined type or electric arc furnace) or during tapping,.then following by final stage deoxidation process by Al and/or Ti addition Al-wire feeder system and/or ladle injection treating station are the undeficient equipments for this new deoxidation process.
  • Fig. 3(a) & 3(b) compare the Si content in the liquid steel between WPD Process and non-WFI) Process.
  • Fig. 3(a) shows the distribution of Si contents in the final molten steel treated by weak pre-deoxldizing with Si contained ferroalloy.
  • Fig. 3(b) shows the distribution of Si contents in the final molten steel without WPD treatment.
  • Fig. 3(a) & 3(b) indicates the percent of the number of heats which contain Si less than 0.02% in the liquid steel by using WPD Process is 96.8%, while that of non-WPD Process is 95.8%.
  • the data obviously shows that the proportion of Si content below 0.02% in the liquid steel of WPD Process is even a little bit higher than that of non-WPD Process.
  • the S i content analyzed by spectroscope is total Si content (including silica), thus confirms that S i contained ferroalloy will not cause Si to be retained in the liquid steel.
  • Si will react with free oxygen first and forms silicon dioxide (Si0 2 ) particles, which distribute in the whole liquid steel. Manganese will then reacts with the oxygen around SiO 2 and forms Silicon-manganese oxides, which can float up almost completely after gas stirring. Therefore, it is the characteristics of the present invention that by adding appropriate amount of Si contained ferroalloy during tapping (or into furnace) the free osygen content can be reduced effectively before Al and/or Ti addition, without fearing of Si being retained.
  • Fig. 4 shows the comparison of the rate of Al recovery between Al-killed steel produced by Weak Pre-Deoxidation Process and conventional deoxidation process.
  • the rate of Al recovery was evidently increased by this invention as indicated in Fig. 4, that is due to the content of free oxygen in molten steel is remarkably decreased. Because of higher recovery rate of Al, caused less Al addition, deoxidation formations could be effectively reduced. Consequently, the internal cleaniness and surface quality of the steel product was remarkably improved by this new process.
  • Table 1 shows the comparison of free oxygen content between WPD Process and conventional deoxidation process before aluminum and/or titanium addition.
  • Purpose of this invention is to lower down the free oxygen content of molten steel as possible before the addition of deoxidizers (aluminum and/or titanium). (The key point of this process is to make sure that there is no silicon remained in the molten steel)
  • deoxidizers aluminum and/or titanium.
  • the amount of free oxygen content lowered can be controlled directly by adjusting the amount of Si contained ferroalloy addition. Owing to the decrease of free oxygen content, recovery of aluminum can be improved, cost can bo lowered, and the quality of steel products can be improved remarkably.
  • Table 2 shows the comparison of typical chemical compositions between the general cold working Al-killed steel grade and the steel designed according to this invention for the same end use.
  • the main difference is that typical chemical composition designed according to this invention has lower aluminum content than that of conventional Al-killed steel grade.
  • the reason for this composition design is to decrease the inclusion formation of deoxidation to get cleaner molten steel. Because of more deoxidizers are added, more chances to form inclusions would result and the cost is also higher. Therefore, the principle of chemical composition design by this invention is to lower the addition of deoxidizers such as aluminum and/or titanium under the condition of no poor deoxidation and good formability. And with the aid of WPD Process, the amount of deoxidizers added can be decreased, cleaner steel and lower production cost will be resulted.
  • This deoxidation method is also suitable for any other kind of Al-killed steel grade.
  • Table 3 shows the comparison of estimated index of inclusions between different deoxidation processes.
  • the main prupose of WPD Process is to improve the internal cleaniness, and improve the quality of casted steel.
  • the table obviously shows that under this new process, the estimated index of inclusions is much better than that of conventional process. It can also be sured that the WPI) Process has much improvement on internal quality of casted steel.
  • Table 4 shows the comparison of grinding speed of billets between different deoxidation processes. In respect of quality, the WPD Process improves not only the internal cleaniness of the casted steel, but also its surface quality. Data listed in the table represent pieces of billets to be ground within unit time (per hour).
  • the WPD Process can make much improvement on surfacial quality of casted steel, and save much surface conditioning cost.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP84303555A 1984-05-25 1984-05-25 Procédé de désoxydation d'acier en deux étapes Expired EP0163784B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8484303555T DE3480350D1 (en) 1984-05-25 1984-05-25 Two stage deoxidation process in steel-making
EP84303555A EP0163784B1 (fr) 1984-05-25 1984-05-25 Procédé de désoxydation d'acier en deux étapes
AT84303555T ATE47727T1 (de) 1984-05-25 1984-05-25 Zweistufiges desoxidationsverfahren bei der stahlherstellung.
ZA852015A ZA852015B (en) 1984-05-25 1985-03-18 Si contained ferro-alloy addition as a weak pre-deoxidation process in steelmaking
AU40220/85A AU567212B2 (en) 1984-05-25 1985-03-21 Pre-deoxidation process in steelmaking

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP84303555A EP0163784B1 (fr) 1984-05-25 1984-05-25 Procédé de désoxydation d'acier en deux étapes
AU40220/85A AU567212B2 (en) 1984-05-25 1985-03-21 Pre-deoxidation process in steelmaking

Publications (2)

Publication Number Publication Date
EP0163784A1 true EP0163784A1 (fr) 1985-12-11
EP0163784B1 EP0163784B1 (fr) 1989-11-02

Family

ID=36838654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84303555A Expired EP0163784B1 (fr) 1984-05-25 1984-05-25 Procédé de désoxydation d'acier en deux étapes

Country Status (5)

Country Link
EP (1) EP0163784B1 (fr)
AT (1) ATE47727T1 (fr)
AU (1) AU567212B2 (fr)
DE (1) DE3480350D1 (fr)
ZA (1) ZA852015B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2809745A1 (fr) * 2000-06-05 2001-12-07 Sanyo Special Steel Co Ltd Acier haute proprete et son procede de production
GB2406580A (en) * 2000-06-05 2005-04-06 Sanyo Special Steel Co Ltd High-cleanliness steel and processes for producing the same
GB2410252A (en) * 2000-06-05 2005-07-27 Sanyo Special Steel Co Ltd High-cleanliness steel and process for producing the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2705196A (en) * 1952-02-20 1955-03-29 Manufacturers Chemical Corp Process for de-oxidizing a molten metal
DE957665C (de) * 1957-01-17 Max-Planck-Institut iur Eisenforschung e V, Dussel dorf Verfahren und Einrichtung zum Behandeln von Eisen- und Stahlbadern
DE969295C (de) * 1954-01-27 1958-05-22 Hoesch Westfalenhuette Ag Verwendung von Stahl- oder Spiegeleisen zur Vordesoxydation von Stahl
FR2387292A1 (fr) * 1977-04-14 1978-11-10 Siderurgie Fse Inst Rech Nouveau procede de desoxydation d'un bain d'acier
EP0002929B1 (fr) * 1977-12-22 1981-11-11 Uss Engineers And Consultants, Inc. Utilisation d'aciers à basse toneur en carbon pour applications électriques

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE957665C (de) * 1957-01-17 Max-Planck-Institut iur Eisenforschung e V, Dussel dorf Verfahren und Einrichtung zum Behandeln von Eisen- und Stahlbadern
US2705196A (en) * 1952-02-20 1955-03-29 Manufacturers Chemical Corp Process for de-oxidizing a molten metal
DE969295C (de) * 1954-01-27 1958-05-22 Hoesch Westfalenhuette Ag Verwendung von Stahl- oder Spiegeleisen zur Vordesoxydation von Stahl
FR2387292A1 (fr) * 1977-04-14 1978-11-10 Siderurgie Fse Inst Rech Nouveau procede de desoxydation d'un bain d'acier
EP0002929B1 (fr) * 1977-12-22 1981-11-11 Uss Engineers And Consultants, Inc. Utilisation d'aciers à basse toneur en carbon pour applications électriques

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2809745A1 (fr) * 2000-06-05 2001-12-07 Sanyo Special Steel Co Ltd Acier haute proprete et son procede de production
WO2001094648A2 (fr) * 2000-06-05 2001-12-13 Sanyo Special Steel Co., Ltd. Acier de grande purete et son procede de production
FR2812660A1 (fr) * 2000-06-05 2002-02-08 Sanyo Special Steel Co Ltd Acier haute proprete et son procede de production
WO2001094648A3 (fr) * 2000-06-05 2002-08-08 Sanyo Special Steel Co Ltd Acier de grande purete et son procede de production
GB2381537A (en) * 2000-06-05 2003-05-07 Sanyo Special Steel Co Ltd High-cleanliness steel and process for producing the same
GB2406580A (en) * 2000-06-05 2005-04-06 Sanyo Special Steel Co Ltd High-cleanliness steel and processes for producing the same
GB2410252A (en) * 2000-06-05 2005-07-27 Sanyo Special Steel Co Ltd High-cleanliness steel and process for producing the same
GB2406580B (en) * 2000-06-05 2005-09-07 Sanyo Special Steel Co Ltd High-cleanliness steel and process for producing the same
GB2410252B (en) * 2000-06-05 2005-09-07 Sanyo Special Steel Co Ltd High-cleanliness steel and process for producing the same
GB2381537B (en) * 2000-06-05 2005-09-14 Sanyo Special Steel Co Ltd High-cleanliness steel and process for producing the same
US7396378B2 (en) 2000-06-05 2008-07-08 Sanyo Special Steel Co., Ltd. Process for producing a high cleanliness steel
DE10196303B3 (de) * 2000-06-05 2014-11-13 Sanyo Special Steel Co., Ltd. Verfahren zur Herstellung eines hochreinen Stahls

Also Published As

Publication number Publication date
DE3480350D1 (en) 1989-12-07
EP0163784B1 (fr) 1989-11-02
AU567212B2 (en) 1987-11-12
ATE47727T1 (de) 1989-11-15
AU4022085A (en) 1986-09-25
ZA852015B (en) 1985-09-19

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