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ultra low sulfur in steel laddle refining

Sulfur Control in Ultra-Low Sulfur Steel Refined by Ladle ...

the steel is reduced from 30 to 6 ppm. When the bottom gas flowrate is 500 NL/min, sulfur in the steel can be reduced to 6 ppm after 10 min. Too high or too low an argon flowrate reduces the desulfurization efficiency. Vacuum degassing followed by Ca-treatment has no effect on desulfurization, but Ca input helps maintain a low sulfur content. Keywords : Ultra-low sulfur steel; desulfurization; ladle furnace-vacuum degassing refining

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Sulfur control in ultra-low sulfur steel refined by

Sulfur control in ultra-low sulfur steel refined by ladle furnace-vacuum degassing. (1) School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing, 100083, China; (2) Hebei Iron and Steel Group, Tangshan Iron and Steel Group Co., Ltd, Tangshan, 063016, China.

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Ladle refining [SubsTech]

31-05-2012  Injection of desulfurizing agents allows to achieve ultra-low concentrations of sulfur in steel (0.0002%). Benefits of Ladle desulfurization by injection of active agents: Deep sulfur

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Study on LF refining technique about ultra low

Download Citation Study on LF refining technique about ultra low sulphur steel X70 For production of ultra low sulphur (w(S) ≤ 0.0020%)X70, all the procedures from hot metal desulphurization ...

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Investigation on slag modifier during refining of

The ladle slag modification treating test was done during the melting of ultra-low sulfur steel. Using the ladle slag modificatioin treating process can decrease FeO content, increase the slag basicity, optimize the desulfurization condition, and is beneficial to refine the ultra-low sulfur steel in Ladle Furnace, preact the refining function, arriving at the minimum sulfur content of 10×10 ...

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Study on Refining Technology of Low-Sulfur Steel ...

In order to bring on the producing of low ultra-low sulfur steel and optimal control of refining slag composition and property converter tapping, slag oxidability and oxygen activity have been analyzed. In addition, optimal refining slag composition and adding process, adding system of modifying agent and bottom argon-blowing in ladle were researched as well.

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A Mathematical Model of Desulphurization Kinetics for ...

flow of liquid steel in the ladle. Because of oxidation atmosphere required for decarburization and reduction atmosphere required for desulphurization, it is necessary for ultra-low-carbon and ultra-low-sulphur steel grades to continue the desulphurization process during RH refining process directly after decarburization and alloying addition

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Ladle Refining Furnace - Electrotherm Steel

These bars have much lower sulphur and phosphorus limits (0.04 max each) and therefore the refining of steel to bring the sulphur and Phosphorus down becomes almost mandatory (especially if the raw material is iron ore).

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Ladle Metallurgy – IspatGuru

These low sulphur contents can only be achieved by steel desulphurization in the ladle in the presence of a calcium aluminate slag when the steel is fully killed. For the required degree of desulphurization to take place within a practical time span, good mixing of steel and slag is essential.

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EP1386011A1 - Ladle refining of steel - Google

The steel is stirred by injection of an inert gas such as argon or nitrogen to cause silicon/manganese deoxidation and desulphurization to produce a silicon/manganese killed molten steel. Stirring of the molten steel by the inert gas injection while in contact with slag high in calcium oxide generates low free oxygen levels in the steel and desulphurization to sulphur levels below 0.009%.

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Study on Refining Technology of Low-Sulfur

In order to bring on the producing of low ultra-low sulfur steel and optimal control of refining slag composition and property converter tapping, slag oxidability and oxygen activity have been analyzed. In addition, optimal refining slag composition and adding process, adding system of modifying agent and bottom argon-blowing in ladle were researched as well.

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Sulfur control in ultra-low sulfur steel refined by

Corpus ID: 133419764. Sulfur control in ultra-low sulfur steel refined by ladle furnace-vacuum degassing @inproceedings{Jingbo2013SulfurCI, title={Sulfur control in ultra-low sulfur steel refined by ladle furnace-vacuum degassing}, author={Y. Jing-bo and Yang Shu-feng and Gao Xiangzhou and L. Jing-she}, year={2013} }

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Investigation on slag modifier during refining of

The ladle slag modification treating test was done during the melting of ultra-low sulfur steel. Using the ladle slag modificatioin treating process can decrease FeO content, increase the slag basicity, optimize the desulfurization condition, and is beneficial to refine the ultra-low sulfur steel in Ladle Furnace, preact the refining function, arriving at the minimum sulfur content of 10×10 ...

More

Method of making ultra-low carbon and sulfur

By employing a multi-step process wherein the melt is vacuum decarburized, followed by deoxidation of the steel, ladle slag deoxidation and steel desulfurization, the inventive method provides an effective and economical means of consistently obtaining ultra-low carbon, ultra-low sulfur steel without the need for complex specialized apparatus, desulfurizing powder fluxes, removal of carry-over ...

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Pretreatment and Refining of Hot Metal – Efficient ...

Pretreatment and Refining of Hot Metal ... increasing requests to produce clean steel with low and ultra-low content of sulphur and phosphorous in particular. Decreasing availability of premium high quality raw ... 5. Desulphurization in the steel ladle

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EP1386011A1 - Ladle refining of steel - Google

The steel is stirred by injection of an inert gas such as argon or nitrogen to cause silicon/manganese deoxidation and desulphurization to produce a silicon/manganese killed molten steel. Stirring of the molten steel by the inert gas injection while in contact with slag high in calcium oxide generates low free oxygen levels in the steel and desulphurization to sulphur levels below 0.009%.

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Mughal Steel

30-01-2015  Ladle Refining. In pursuit of making ... Molybdenum etc. are added to make special steel, spring steel, auto motive steel, stainless steel and low alloy steel. The two elements that can be mostly responsible for affecting the characteristics and properties of the steel, carbon and sulphur, ...

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(PDF) Inclusion Evolution and Removal in Ladle

Inclusion Evolution and Removal in Ladle Refining R. J. O’Malley Iverson Chair Professor and Director of the PSMRC Materials Science Engineering Missouri University of Science Technology 1400 N. Bishop Ave. Rolla, MO 65409 [email protected] (573) 341-7683 Abstract The production of steels with low total oxygen content and preferred oxide morphologies requires effective inclusion

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CA2441839C - Ladle refining of steel - Google

steel ladle slag molten steel content Prior art date 2001-04-02 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.) Active Application number CA 2441839 Other languages English (en) French (fr) Other versions

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ALLOGY: Ladle refining

Methods of vacuum ladle degassing utilize the reaction of deoxidation by carbon dissolved in steel according to the equation: [C] + [O] = {CO} where: [C] and [O] - carbon and oxygen dissolved in liquid steel; {CO} - gaseous carbon monoxide. Vacuum treatment of molten steel decreases the partial pressure of CO, which results in shifting equilibrium of the reaction of carbon oxidation.

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Investigation on slag modifier during refining of

The ladle slag modification treating test was done during the melting of ultra-low sulfur steel. Using the ladle slag modificatioin treating process can decrease FeO content, increase the slag basicity, optimize the desulfurization condition, and is beneficial to refine the ultra-low sulfur steel in Ladle Furnace, preact the refining function, arriving at the minimum sulfur content of 10×10 ...

More

Pretreatment and Refining of Hot Metal – Efficient ...

Pretreatment and Refining of Hot Metal ... increasing requests to produce clean steel with low and ultra-low content of sulphur and phosphorous in particular. Decreasing availability of premium high quality raw ... 5. Desulphurization in the steel ladle

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(PDF) 13 - Kunz - LADLE REFRACTORIES FOR

There is also a strong influence of the steel's sulfur content on the ability to pickup nitrogen [10]. Picture 7 shows that the lower the sulfur content, the higher the proneness to nitrogen pickup, the higher the susceptibility to nitrogen pickup. Low sulphur steel therefore requires closed casting with Ar-purging to minimize N-pickup.

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Mughal Steel

30-01-2015  Ladle Refining. In pursuit of making ... Molybdenum etc. are added to make special steel, spring steel, auto motive steel, stainless steel and low alloy steel. The two elements that can be mostly responsible for affecting the characteristics and properties of the steel, carbon and sulphur, ...

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Development of High Quality Heavy Plates on ... - Nippon Steel

sulfur content of about 50 ppm on products basis and has enabled the production of low-sulfur steel in a large quantity without diffi-culty. 4.1.2 Molten-steel desulfurization For steels with ultra-low sulfur content (upper criteria of standard: 30 ppm) unattainable by KR desulfurization method alone,

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Method of making ultra-low carbon and sulfur

By employing a multi-step process wherein the melt is vacuum decarburized, followed by deoxidation of the steel, ladle slag deoxidation and steel desulfurization, the inventive method provides an effective and economical means of consistently obtaining ultra-low carbon, ultra-low sulfur steel without the need for complex specialized apparatus, desulfurizing powder fluxes, removal of carry-over ...

More

(PDF) Inclusion Evolution and Removal in Ladle

Inclusion Evolution and Removal in Ladle Refining R. J. O’Malley Iverson Chair Professor and Director of the PSMRC Materials Science Engineering Missouri University of Science Technology 1400 N. Bishop Ave. Rolla, MO 65409 [email protected] (573) 341-7683 Abstract The production of steels with low total oxygen content and preferred oxide morphologies requires effective inclusion

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Ladle Furnace - an overview ScienceDirect Topics

2.4.3 Ladle furnace refining and ladle slag. After being tapped from the BOF or EAF, the molten steel produced by the primary processes may undergo further refining to remove additional impurities remaining within the steel, or add allying elements to obtain the required chemical composition and grade of

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Sulphur in Steels – IspatGuru

Sulphur in Steels. satyendra; September 23, 2014; 0 Comments ; corrosion, Ductility, hot shortness, steel, strength, Sulphur, toughness,; Sulphur in Steels Sulphur (S) (atomic number 16 and atomic weight 32.066) has density of 2.05 gm/cc. Monoclinic S melts at 119.25 deg C and boils at 444.6 deg C.

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Ladle Refining Process Steel Oxygen

Ladle Refining Process - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. steel refining

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LADLE FURNACE SECONDARY METALLURGICAL PROCESS ...

LADLE FURNACE SECONDARY METALLURGICAL PROCESS. DESULPHURIZATION OF FERRONICKEL, HIGH SULFUR CONTENT (0,5% a 1,0%)1 Fernando Hernández Polanco.2 Mercedita Nejarda Figueroa. 3 Abstract Increasing demand on stainless steel series 300 from world´s industries has motivated to former ferronickel producers to optimize their plants and attract new

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2009:065 MASTER'S THESIS Improvement of the ...

The refining of molten steel in the ladle furnace to meet the required compositional range ... 1.4 Effects of Sulphur on Steel ... additives; low alloy steel, medium alloy and high alloy steel (1). 1.2 Historical Background of Ovako

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Refining furnace (seconclary refining) - Steel Tube

The mid-1980s, the countries of the world into industrial production furnace refining equipment, some more than 500 seats, the production of bearing steel in the United States and Japan have all been outside the furnace vacuum treatment (RH French, DH, etc.), steel and control of ultra-low sulfur inclusions form of steel steel package dusting treatment method (TN method, SL) production.

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LF Refining Scientific.Net

Abstract: The hydrogen content was measured by HYDRIS hydrogen analyzer during ladle furnace (LF) refining process aiming to test the regular pattern of hydrogen variation in molten steel. The results showed that the hydrogen increased during temperature rising, Ca-treatment and soft blowing argon period, and the absolute increment were 0.64 ppm and 0.46 ppm respectively.

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(PDF) Inclusion Evolution and Removal in Ladle

Inclusion Evolution and Removal in Ladle Refining R. J. O’Malley Iverson Chair Professor and Director of the PSMRC Materials Science Engineering Missouri University of Science Technology 1400 N. Bishop Ave. Rolla, MO 65409 [email protected] (573) 341-7683 Abstract The production of steels with low total oxygen content and preferred oxide morphologies requires effective inclusion

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Process and additive for the ladle refining of steel ...

Ladle refining has been investigated as an area where slag recycling could be used to benefit the fluxing into solution of lime. U.S. Pat. No. 4,842,642 details the use of blast furnace slag as a flux in a ladle refining operation which therefore allows for the elimination of fluorspar.

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Sulphur in Steels – IspatGuru

Sulphur in Steels. satyendra; September 23, 2014; 0 Comments ; corrosion, Ductility, hot shortness, steel, strength, Sulphur, toughness,; Sulphur in Steels Sulphur (S) (atomic number 16 and atomic weight 32.066) has density of 2.05 gm/cc. Monoclinic S melts at 119.25 deg C and boils at 444.6 deg C.

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Ladle Refining Process Steel Oxygen

Ladle Refining Process - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. steel refining

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Steel - Ladle metallurgy Britannica

16-03-2021  Steel - Steel - Ladle metallurgy: The carrying out of metallurgical reactions in the ladle is a common practice in practically all steelmaking shops, because it is cost-efficient to operate the primary furnace as a high-speed melter and to adjust the final chemical composition and temperature of the steel after tapping. Also, certain metallurgical reactions, for reasons of equipment design and ...

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Steelmaking and Refining Introduction to

Steelmaking Overview. Steelmaking is the second step in producing steel from iron ore. In this stage, impurities such as sulfur, phosphorus, and excess carbon are removed from the raw iron, and alloying elements such as manganese, nickel, chromium, and vanadium are added to produce the exact steel

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