scholarly journals Reoxidation of Al-Killed Steel by Cr2O3 from Tundish Cover Flux

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 554 ◽  
Author(s):  
Feng Wang ◽  
Daoxu Liu ◽  
Wei Liu ◽  
Shufeng Yang ◽  
Jingshe Li
Keyword(s):  
Experimental Study ◽  
Oxygen Content ◽  
Liquid Steel ◽  
Controlled Experiments ◽  
Low Oxygen ◽  
Total Oxygen ◽  
Total Oxygen Content

Reoxidation has long been a problem when casting ultra-low oxygen liquid steel. An experimental study of the reoxidation phenomenon caused by Cr2O3-bearing cover flux of Al-killed steel is presented here. MgO-CaO-SiO2-Al2O3-Cr2O3 tundish cover flux with various Cr2O3 contents were used to study the effects of Cr2O3 on total oxygen content (T[O]) and alumina and silicone loss of Al-killed steel at 1923 K (1650 °C). It was found that Cr2O3 can be reduced by Al to cause reoxidation, and the reaction occurs mainly within 2 to 3 min after the addition of the tundish cover flux with 5% and 10% Cr2O3 concentration. T[O] and Al loss increase with higher Cr2O3 concentration flux. Two controlled experiments were also made to investigate the oxygen transported to the steel by the decomposition of Cr2O3. It was calculated that when Al is present in steel, more than 90% of the reoxidation of Cr2O3 is caused by Al, and the rest is caused by decomposition.

Thermodynamic Characteristics of Y2O3 and Y2S3 Nonmetallic Phase Formed in Liquid Steel

2020 ◽  
Vol 844 ◽  
pp. 9-23
Author(s):  
Sergii Gerasin ◽  
Dorota Kalisz ◽  
Jerzy Iwanciw
Keyword(s):  
Oxygen Content ◽  
Molten Steel ◽  
Liquid Steel ◽  
Thermodynamic Characteristics ◽  
Phase Precipitation ◽  
Low Oxygen ◽  
Metallic Oxide ◽  
Metal Bath ◽  
Metallic Inclusions ◽  
The Relationship

The current work deals the phenomenon of non-metallic inclusions as a result of the addition of Yttrium as an alloying component. The order of introducing individual components determines its final content in steel. This problem was analyzed using the WYK_Stal program developed at AGH-UST. Individual cases were considered using the accepted thermodynamics models based on Wagner’s formalism. The study of Y2O3 and Y2S3 phase precipitation and the relationship between the addition of Y, Al, Ca, O and S in molten steel was studied using the thermodynamic models. Based on the simulation, the authors stated that, the introduction of aluminum as the final deoxidizer into the liquid steel before the yttrium, results in the formation of non-metallic oxide inclusions. The low oxygen content in the metal bath promotes the formation of yttrium sulphide. In the case of calcium dosing, it is reasonable that, the yttrium is introduced after this element, which limits the losses on the formation of the yttrium sulphide phase.

Refining Total Oxygen Content in the Solid Soil Phase

2019 ◽  
Vol 74 (3) ◽  
pp. 99-104
Author(s):  
Yu. N. Vodyanitskii ◽  
A. T. Savichev
Keyword(s):  
Oxygen Content ◽  
Total Oxygen ◽  
Total Oxygen Content ◽  
Solid Soil

Cavity Formation in Iron Oxide

CORROSION ◽  
1958 ◽  
Vol 14 (1) ◽  
pp. 57-64 ◽  
Author(s):  
D. W. JUENKER ◽  
R. A. MEUSSNER ◽  
C. E. BIRCHENALL
Keyword(s):  
Iron Oxide ◽  
Oxygen Content ◽  
High Temperatures ◽  
Diffusion Path ◽  
Deep Oxidation ◽  
Oxygen Atmosphere ◽  
Cavity Formation ◽  
Total Oxygen ◽  
Total Oxygen Content ◽  
Scale Thickness

Abstract A study is made of the deep oxidation of iron at high temperatures and in an oxygen atmosphere. Large cavities are always found in specimens whose total oxygen content has been brought to that of FeO. The scale thickness of such specimens, along with other evidence, implies that FeO is plastic in the temperature range in which it is stable, while one or both of the higher oxides is relatively rigid. Evidence is presented which indicates that iron is transported to its surrounding scale with little or no body diffusion path; the mechanism involved is not identified. An expression, analogous to the parabolic rate law for scaling of plane specimens, is developed for application to cylindrical geometry. 3.2.3

Analysis of Micro Inclusions in Q195 Steel

2014 ◽  
Vol 540 ◽  
pp. 68-71
Author(s):  
Shuo Ming Wang ◽  
Yan Wang ◽  
Ruo Si Wang
Keyword(s):  
Production Process ◽  
Oxygen Content ◽  
System Analysis ◽  
Steel Production ◽  
Average Content ◽  
Steel Mill ◽  
Total Oxygen ◽  
Total Oxygen Content ◽  
Steel Quality ◽  
Transient Casting

Aimed at the Q195 steel production process in a steel mill, using tracer analysis make system analysis to the process of production and microscopic inclusions content. In the steady casting average T[O] is 117.22ppm, [N] is 22.6ppm, micro inclusions average content is 11.96/mm2, while the average T[O] and [N] in transient casting billet is 161.93ppm and 30.49ppm, micro inclusions averaged content is 16.068/mm2. The total oxygen content in steel on the high side, should strengthen deoxidization. Argon stirring strength is too large, inclusions in casting slab containing tracer element, illustrate the ladle slag, tundish slag, mould protection slag are forming pollution on billet, should reduce the influence of transient casting on the steel quality.

scholarly journals Thermodynamic and kinetic simulation of Y2O3 and Y2S3 nonmetallic phase formation in liquid steel

2020 ◽  
Vol 56 (1) ◽  
pp. 11-25
Author(s):  
S. Gerasin ◽  
D. Kalisz ◽  
J. Iwanciw
Keyword(s):  
Oxygen Content ◽  
Phase Formation ◽  
Liquid Steel ◽  
Manganese Sulfide ◽  
Kinetic Simulation ◽  
Phase Precipitation ◽  
Low Oxygen ◽  
Metal Bath ◽  
Metallic Inclusions ◽  
The Relationship

The current work deals with the phenomenon of non-metallic inclusions as a result of the addition of yttrium to the liquid steel as an alloying component. The order of introducing individual components determines their final content in steel, and this problem was analyzed using the WYK_Stal program developed at AGH. The study of Y2O3 and Y2S3 phase precipitation and the relationship between the addition of Y, Al, Ca, O, and S in molten steel was studied using the thermodynamic models based on Wagner?s formalism. The introductions of yttrium prior to aluminum brought about huge losses, and it mainly occurred due to the formation of oxides. The low oxygen content in the metal bath promotes the formation of yttrium sulphide. When yttrium is introduced after aluminum and calcium, yttrium is used for the precipitation of its sulfide, and in this way the manganese sulfide formation is reduced.

Experimental study of the fuel jet combustion in high temperature and low oxygen content exhaust gases

Energy ◽  
2005 ◽  
Vol 30 (2-4) ◽  
pp. 373-384 ◽  
Author(s):  
Simon Lille ◽  
Wlodzimierz Blasiak ◽  
Marcin Jewartowski
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
Oxygen Content ◽  
Low Oxygen ◽  
Exhaust Gases ◽  
Fuel Jet
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