Modification of Inclusions in Molten Steel by Mg-Ca Transfer from Top Slag: Experimental Confirmation of the ‘Refractory-Slag-Metal-Inclusion (ReSMI)’ Multiphase Reaction Model

2017 ◽  
Vol 48 (6) ◽  
pp. 2820-2825 ◽  
Author(s):  
Jae Hong Shin ◽  
Joo Hyun Park
Keyword(s):  
Molten Steel ◽  
Reaction Model ◽  
Experimental Confirmation ◽  
Metal Inclusion ◽  
Multiphase Reaction ◽  
Top Slag

scholarly journals Mass-Transfer Model for Steel, Slag, and Inclusions during Ladle-Furnace Refining

2018 ◽  
Vol 37 (7) ◽  
pp. 665-674
Author(s):  
Liguang Zhu ◽  
Yanan Jia ◽  
Zengxun Liu ◽  
Caijun Zhang ◽  
Xingjuan Wang ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Molten Steel ◽  
Film Theory ◽  
Steel Slag ◽  
Reaction Model ◽  
Transfer Model ◽  
Ladle Furnace ◽  
Precise Control ◽  
Transfer Behavior ◽  
Coupled Reaction

AbstractPrecise control of inclusion and molten steel compositions during ladle-furnace refining is important to obtain high-quality steel. Mass-transfer behavior affects these compositions. A model was developed to investigate the mass transfer occurring between molten steel, slag, inclusions, and the refractory during ladle-furnace refining, using two-film theory to describe the reactions. A coupled-reaction model based on the CaO–Al2O3–MgO–SiO2–FeO–P2O5 slag and Mn–Si–Al–Ca–Mg–P–S–O steel systems was applied to describe the reactions between molten steel and slag; the reactions between the refractory lining and slag or steel were described using average industrial erosion rate data. The model was used to calculate changes in the compositions of molten steel and slag, oxygen activity at the slag–molten steel interface, and composition of the inclusions. The calculated results agreed with operational results for a 100 t ladle furnace at the Tangsteel plant in China.

Influence of Top Slag on the Plasticity of CaO-SiO2-Al2O3 Inclusions in 42CrMoA Crankshaft Steel

2014 ◽  
Vol 804 ◽  
pp. 285-288
Author(s):  
Jian Tao Ju ◽  
Sen Yang ◽  
Yan Ping Guo ◽  
Yuan She ◽  
Zhao Hui Zhang
Keyword(s):  
Molten Steel ◽  
Good Choice ◽  
Oxygen Activity ◽  
Theoretical Research ◽  
Calcium Activity ◽  
Research Results ◽  
Mass Percent ◽  
Top Slag

In order to control the plasticity of CaO-SiO2-Al2O3system inclusions so as to reduce the harm to the quality of 42CrMoA crankshaft steel, the target controlling ranges of CaO-SiO2-Al2O3inclusions is put forward. On the basis, influence of CaO-SiO2-Al2O3and CaO-SiO2-Al2O3-MgO system top slag on the content of calcium and aluminum in molten steel is contrasted. Theoretical research results show that, calcium activity should be controlled in the range of (90~3300)×10-10, oxygen activity should be below 7×10-6, the mass percent of calcium should be controlled more than 75ppm. And CaO-SiO2-Al2O3-MgO should be a good choice to obtain the plastic inclusions of CaO-SiO2-Al2O3.

Granular bainite or granular ferrite? A preliminary TEM investigation of an HSLA-100 steel

1991 ◽  
Vol 49 ◽  
pp. 584-585
Author(s):  
R. Varughese ◽  
S. W. Thompson ◽  
P. R. Howell
Keyword(s):  
Room Temperature ◽  
Transformation Products ◽  
Accurate Description ◽  
Granular Bainite ◽  
Preliminary Results ◽  
The Past ◽  
Light Micrograph ◽  
Multiphase Reaction ◽  
Detailed Nature

Ever since Habraken and Economopoulos first employed the term granular bainite to classify certain unconventional transformation products in continuously cooled steels, the term has been widely accepted and used, despite the lack of a clear consensus as to the detailed nature of the transformation products which constitute granular bainite. This paper presents the preliminary results of a TEM investigation of an 0.04 wt% C, copper-containing steel (designated HSLA-100). It is suggested that the term granular ferrite rather than granular bainite is a more accurate description of this multiphase reaction product.Figure 1 is a light micrograph of a sample which had been air-cooled from 900°C to room temperature. The microstructure is typical of that which has been termed granular bainite in the past and appears to consist of equiaxed ferritic grains together with other minor transformation products. In order to examine these structures in more detail, both continuously cooled and isothermally transformed and quenched materials have been examined with TEM. Granular bainite has been found in virtually all samples.

Microstructure Changes of Aluminum Titanate Refractory Doped SiO2 and ZrO2 in Molten Steel

2015 ◽  
Vol 48 (6) ◽  
pp. 116-122 ◽  
Author(s):  
Hyeong-Jun Kim ◽  
Dami Kim ◽  
Hyung-Tae Kim ◽  
Sung-Soo Ryu
Keyword(s):  
Molten Steel ◽  
Aluminum Titanate ◽  
Microstructure Changes

ON THE EQUILIBRIUM OF CARBON AND OXYGEN IN MOLTEN STEEL (2nd Report)

1937 ◽  
Vol 23 (11) ◽  
pp. 1053-1057
Author(s):  
Tetuo Ogii
Keyword(s):  
Molten Steel

Experimental confirmation of the possibility of using a hydraulic diode in the discharge line of a spur rotary pump

2020 ◽  
pp. 56-58
Author(s):  
S.Yu. Kaygorodov
Keyword(s):  
Experimental Confirmation ◽  
Rotary Pump ◽  
Indicator Diagram ◽  
Discharge Line ◽  
Hydraulic Machine

The operation of a spur rotary pump with different elements (valve, hydraulic diode, long and short pipelines) in the discharge line is investigated. Keywords hydraulic machine, spur rotary pump, hydrodiode, indicator diagram. [email protected]

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