Mechanism of Slag Composition Change During Electroslag Remelting Process

2011 ◽  
Vol 18 (10) ◽  
pp. 24-28 ◽  
Author(s):  
Jun-xue Zhao ◽  
Yan-mei Chen ◽  
Xiao-ming Li ◽  
Ya-ru Cui ◽  
Xiao-tao Lu
Keyword(s):  
Slag Composition ◽  
Electroslag Remelting ◽  
Composition Change

Thermodynamic Study on Production of Fe-Si–Mn Alloy from Adjusted Converter Slag

2011 ◽  
Vol 295-297 ◽  
pp. 2290-2293
Author(s):  
Zhen Tian ◽  
Qing Xian Yu ◽  
Min Chen
Keyword(s):  
Slag Composition ◽  
Converter Slag ◽  
Selective Reduction ◽  
Reducing Agent ◽  
Thermodynamic Study ◽  
Reduction Temperature ◽  
Composition Change

The composition change of slag and alloy phases were investigated during the process of selective reduction by thermodynamic calculating the selective reduction of the slag components with different modified slag composition, addition of reducing agent and reduction temperature. The results showed that the process of the selective reduction will be promoted by raising the temperature and the ratio of modifier to slag. The solubility of SiO2 increased as temperature increased. Selecting the appropriate amount of modifier will promote the selective reduction. In the first stage, Fe was reduced from the slag, followed by the reduction of P, Mn and Si. Finally, Fe-Si-Mn metal was obtained as a result of the selective reduction.

Study on the Cleanliness of 316L Stainless Steel

2011 ◽  
Vol 311-313 ◽  
pp. 881-885
Author(s):  
Gang Li ◽  
Jing She Li ◽  
Shu Feng Yang ◽  
Yan Jie Wang ◽  
Nai Song Li
Keyword(s):  
Stainless Steel ◽  
Acid Solution ◽  
Power Supply ◽  
Slag Composition ◽  
316L Stainless Steel ◽  
Electroslag Remelting ◽  
Drawing Process ◽  
Total Oxygen ◽  
Three Phase ◽  
316L Steel

The process of three-phase electroslag furnacefoundry casting  electroslag remelting was used to produce 316L stainless steel ultra-fine wires with a diameter of 0.018mm. Breakage of the wire often occurs during drawing process due to the existence of inclusions in the steel. In order to improve the cleanliness of 316L steel, the deoxidizer and top slag composition were optimized by industrial trials in this production process. As a result, the total oxygen (T.O.) content decreased from 120 ppm to 57ppm. During the electroslag remelting process, the composition of electroslag and the power supply were optimized. Argon protection was used and electrode was washed by acid solution before refining. Finally, the T.O. in the remelting ingot can be controlled below 20 ppm.

Effect of slag composition on desulfurization during recycling rejected electrolytic manganese metal by electroslag remelting

2021 ◽  
Vol 118 (2) ◽  
pp. 206
Author(s):  
Yu Liu ◽  
Guangqiang Li ◽  
Qiang Wang ◽  
Ru Lu ◽  
Xijie Wang ◽  
...  
Keyword(s):  
Sulfur Content ◽  
Distribution Ratio ◽  
Slag Composition ◽  
Molten Slag ◽  
Electroslag Remelting ◽  
Metal Scrap ◽  
Sulfur Distribution ◽  
Lower Viscosity ◽  
Electrolytic Manganese ◽  
Sulfur Distribution Ratio

To reduce the Mn vaporization during recycling rejected electrolytic manganese metal by electroslag remelting, it is proposed to reduce the temperature of molten slag pool, but which leads to the degradation of slag desulfurization. The desulfurization by interaction between CaF2–CaO–Al2O3–Na2O slag and rejected electrolytic manganese metal scrap was studied from the view of thermodynamics in this study. The results show that sulfur distribution ratio decreases with increase of CaF2 content, and increases with the increase of Na2O content and temperature. Na2O increases sulfur distribution ratio of slag by increasing CaO activity. Na2O addition in CaF2–CaO–Al2O3–Na2O slag can enhance desulfurization ability of slag due to the larger sulfur distribution ratio and lower viscosity. Thus, sulfur content in test of slag T3 bearing 45.8 wt% CaF2-23.2 wt% CaO-22.7 wt% Al2O3-8.3 wt% Na2O is much lower than that of slag without Na2O, implying that 45.8 wt% CaF2-23.2 wt% CaO-22.7 wt% Al2O3-8.3 wt%Na2O slag is the promising slag for recycling rejected electrolytic manganese metal by ESR.

Effect of SiO2 containing slag for electroslag remelting on inclusion modification of 42CrMo steel

2019 ◽  
Vol 116 (6) ◽  
pp. 627 ◽  
Author(s):  
Yu Liu ◽  
Zhao Zhang ◽  
Guangqiang Li ◽  
Yang Wu ◽  
Xijie Wang ◽  
...  
Keyword(s):  
Slag Composition ◽  
Molten Slag ◽  
Oxide Inclusion ◽  
Electroslag Remelting ◽  
Slag Viscosity ◽  
Oxide Inclusions ◽  
Al Content ◽  
42Crmo Steel ◽  
Increasing Trend ◽  
Inclusion Modification

Five heats were carried out to study the effects of SiO2 containing slag for electroslag remelting (ESR) on inclusion characteristics of 42CrMo steel. Fluoride vaporization at elevated temperature from slags was also explored by thermogravimetric analysis. The results show that fluoride vaporization is dominated by slag viscosity and component activities in the melt. Slag composition has an important effect on the composition of the oxide inclusion. For 70 wt% CaF2–30 wt% Al2O3 slag, the compositions of oxide inclusions in remelted steel show no obvious differences compared with the virgin steel. Whereas, SiO2 content in oxide inclusions of steel processed by slag bearing SiO2 show an increasing trend with increase of SiO2 content in 50 wt% CaF2–CaO–SiO2 slag, and the MgO · Al2O3 inclusions are modified to (Al,Ca,Mg,Si)O inclusions with low melting temperature. Al2O3 contents in oxide inclusions are also closely related to the Al2O3 concentration in the molten slag, which increase with the addition of Al2O3 in slag bearing SiO2. In testing various slags, the incorporation of slag T2 with 50 wt% CaF2–30 wt% CaO–20 wt% SiO2 shows the highest cleanliness in remelted steel. This implies that slag T2 can be a promising slag for ESR process of alloy steel requiring Al content refinement due to less fluoride vaporization from slag and better inclusions modification.

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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