Optimization of Refining Slag Composition and the Deoxidation Practice of Liquid Steel in BOF–CAS–CC Process

2019 ◽  
Vol 73 (2) ◽  
pp. 497-504
Author(s):  
Shuo Zhao ◽  
Yangyang Ge ◽  
Fuli Zhang ◽  
Zushu Li
Keyword(s):  
Liquid Steel ◽  
Slag Composition ◽  
Refining Slag ◽  
Deoxidation Practice

Research on Increasing the Nitrogen Removal Efficiency by Changing the Secondary Treatment Parameters

2014 ◽  
Vol 216 ◽  
pp. 267-272 ◽  
Author(s):  
Erika Ardelean ◽  
Marius Ardelean ◽  
Teodor Hepuț ◽  
Florin Drăgoi
Keyword(s):  
Removal Efficiency ◽  
Stainless Steels ◽  
Liquid Steel ◽  
Austenitic Stainless Steels ◽  
Inert Gases ◽  
Secondary Treatment ◽  
Refining Slag ◽  
Main Method ◽  
Flow Pressure

The existence of gases in the solid metals (hydrogen and nitrogen) assumes the presence of these gases in metals even before solidification, respectively in the elaboration, secondary treatment and casting phases. Usually, great amounts of gases dissolved in steels can be detected, between 3.5-8ppm for hydrogen and 0.02-0.03% for nitrogen, respectively. There are also cases when the purpose is to alloy with nitrogen, this being the case of austenitic stainless steels where the nitrogen content can reach 0.5% using ferrochromium or ferromanganese alloyed with nitrogen in 3-5.5 %. The main method of removing these gases is bubbling with inert gases and /or treating the steel in a vacuum facility. The paper presents a study regarding increasing the removal efficiency of nitrogen from the liquid steel by changing the bubbling parameters (flow, pressure, duration) but also the basicity of the refining slag. The equations of the regression surface and the identified fields are of a real help for the technologists, allowing quick decisions but they are also important for the quality of the metallic products [.

scholarly journals Assessment of the Possibility of Utilising Waste Materials from the Aluminium Production in the Copper Alloys Refining Processes

2013 ◽  
Vol 13 (4) ◽  
pp. 15-20
Author(s):  
A. W. Bydałek ◽  
A. Bydałek ◽  
S. Biernat ◽  
P. Schlafka
Keyword(s):  
Slag Composition ◽  
Copper Alloys ◽  
Waste Materials ◽  
Refining Slag ◽  
Aluminium Production ◽  
Thermogravimetric Investigations ◽  
Refining Processes

Abstract The analysis of possibilities of utilising waste materials as equivalents of substances stimulating in copper alloys refining processes was presented. The results of thermogravimetric investigations determining the refining ability of the slag with the selected waste materials from the aluminium production were discussed. The possibility of optimisation of the refining slag composition on the basis of the Slag- Prop software was indicated.

Structure-Sensitive Properties of Liquid Steel: Efficacy Evaluation of Its Treatment with Modifiers and Refining Slag

2019 ◽  
Vol 2019 (12) ◽  
pp. 1231-1237
Author(s):  
O. Yu. Sheshukov ◽  
I. V. Nekrasov ◽  
V. V. Konashkov ◽  
D. K. Yegiazaryan
Keyword(s):  
Liquid Steel ◽  
Refining Slag ◽  
Efficacy Evaluation ◽  
Structure Sensitive

Study on Refining Technology of Low-Sulfur Steel

2011 ◽  
Vol 418-420 ◽  
pp. 196-200
Author(s):  
Min Zhang ◽  
Jian Hua Zeng
Keyword(s):  
Optimal Control ◽  
Sulfur Content ◽  
Slag Composition ◽  
Refining Process ◽  
Oxygen Activity ◽  
Refining Slag ◽  
Modifying Agent ◽  
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. On this basis, refining process of low-sulfur steel has been optimized. The results show that sulfur content in steel is as low as 6.6×10-6~40×10-6，which achieved the production of low sulfur steel.

scholarly journals Effect of Mn Content on the Reaction between Fe-xMn (x = 5, 10, 15, and 20 Mass Pct) Steel and CaO-SiO2-Al2O3-MgO Slag

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1200
Author(s):  
Huixiang Yu ◽  
Muming Li ◽  
Jiaming Zhang ◽  
Dexin Yang
Keyword(s):  
Oxygen Content ◽  
Thermodynamic Analysis ◽  
Slag Composition ◽  
Composition Change ◽  
Number Density ◽  
Refining Slag ◽  
Steel Cleanliness ◽  
Mn Content ◽  
Mn Steel ◽  
Top Slag

Medium- and high-Mn steels have excellent properties but are very difficult to be commercially produced because of the high content of some alloy elements. To enhance the understanding of the reaction between medium/high-Mn steel and refining slag which is significantly different from the conventional steels, steel and slag composition and the inclusions were investigated by equilibrium reaction between Fe-xMn (x = 5, 10, 15, and 20 mass pct) and CaO-SiO2-Al2O3-MgO top slag at 1873 K in the laboratory. Furthermore, the effect of Mn content on inclusion transformation and steel cleanliness was also explored. After slag–steel reaction, both contents of MnO in slag and Si in steel increased. Most MnO inclusions in master steel transformed to MnO-SiO2 and MnO-Al2O3-MgO. With the increase in Mn content, the amount share of MnO type inclusions decreased and that of MnO-Al2O3-MgO type increased. In addition, both the number density of observed inclusions and the calculated oxygen content in inclusions increased. Thermodynamic analysis indicates that the composition change of steel and slag and the transformation of inclusions are mainly the consequence of the reaction between Mn in molten steel and SiO2 and MgO in top slag. The dissolved Mn in medium/high-Mn steel presents a strong reactivity.

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