scholarly journals High Temperature Rheometric Measurements of Mould Powders

2015 ◽  
Vol 60 (1) ◽  
pp. 289-294 ◽  
Author(s):  
W. Ślęzak ◽  
M. Korolczuk-Hejnak ◽  
P. Migas
Keyword(s):  
High Temperature ◽  
Continuous Casting ◽  
Carbon Content ◽  
Casting Process ◽  
Chemical Compositions ◽  
Continuous Casting Process ◽  
Shear Rates ◽  
Rheological Measurements ◽  
Real Process ◽  
Theoretical Considerations

Abstract Issues of viscosity and rheological properties of powder moulds are important from the perspective of modelling, along with the control of continuous casting process. Conducted analysis within subject literature indicates that there are many theoretical considerations concerning the effects of viscosity of powder moulds. The objective of this study was to perform rheological measurements of powder moulds, the study contains the results of rheological tests of seven chemical compositions with a carbon content from 5.0 to 10.7% and which were tested with applied shear rates from 10 to 40 s-1, which are similar to those in a real process: the velocity of strand passes/drawing and mould movements.

scholarly journals Effects of metallurgical factors on reticular crack formations in Nb-bearing pipeline steel

2020 ◽  
Vol 39 (1) ◽  
pp. 81-87 ◽  
Author(s):  
Hangyu Zhu ◽  
Lanqing Wang ◽  
Jianli Li ◽  
Jixuan Zhao ◽  
Yue Yu
Keyword(s):  
Iron Oxide ◽  
Continuous Casting ◽  
Pipeline Steel ◽  
Solidification Process ◽  
Casting Process ◽  
Chemical Compositions ◽  
Steel Matrix ◽  
Continuous Casting Process ◽  
Residual Elements ◽  
Crack Susceptibility

AbstractMicroscopic morphologies of reticular cracks in Nb-bearing pipeline surfaces are shown in this work. A decarburization layer, oxidized round spots, and the distributions of residual elements are each detected to better understand the mechanisms of reticular crack formations. The results show that reticular cracks are discontinuously distributed and filled with iron oxide. The oxidized round spots near the crack sides are larger and more intensive than steel matrix, with primary chemical compositions of Fe, Mn, and Si oxides. There is no obvious enrichment of Cu, Cr, or Sn near the crack zones. The formation of reticular cracks occurs prior to both decarburization and the formation of oxidized round spots. The ferrite potential (FP) of the examined pipeline steel is 1.05, which leads to a higher relative crack susceptibility. It is concluded that reticular cracks are generated during the continuous casting solidification process due to the extension of intergranular microcracks along grain boundaries under the abnormal conditions of the continuous casting process.

Simulation and Investigation on Physical Properties of Continuous Casting Slab AH36 at High Temperature

2008 ◽  
Vol 575-578 ◽  
pp. 75-79 ◽  
Author(s):  
M.J. Long ◽  
D.F. Chen ◽  
Chen Guang Bai ◽  
L. Huang ◽  
L.Y. Wen
Keyword(s):  
High Temperature ◽  
Continuous Casting ◽  
Physical Properties ◽  
Temperature Drop ◽  
Casting Process ◽  
Thermal Capacity ◽  
Scientific Data ◽  
Continuous Casting Process ◽  
External Temperature ◽  
Thermal Expansion Property

During the continuous casting process, physical properties of slab for continuous casting at high temperature have an important effect on the slab quality in different part and the curve establishment of external target temperature for slab. It has significance to simulate and investigate the physical behaviors of slab at high temperature during the continuous casting process. Investigation existent in this field is scarce around the world. Continuous casting process is a complicated cooling process in unsteady state that sometimes the external temperature of slab will rise. In allusion to temperature rise and temperature drop, the paper simulated and investigated the physical properties of slab AH36 at high temperature under conditions of different temperatures and different temperature variation velocities, such as thermal expansion property, differential thermal analysis curve (DSC), isobaric thermal capacity (CP) and so on. Results of the investigation have provided a scientific data base for a further study on continuous casting technology and quality control for steel AH36.

The Air Reoxidation and the Formation of Large Inclusions in Continuous Casting Process

1973 ◽  
Vol 59 (1) ◽  
pp. 72-84 ◽  
Author(s):  
Kichinosuke MATSUNAGA ◽  
Chikakazu NAMIKI ◽  
Taiji ARAKI
Keyword(s):  
Continuous Casting ◽  
Casting Process ◽  
Continuous Casting Process

Development of Electromagnetic Swirling Flow in Immersion Nozzle in Continuous Casting Process of Steel

2011 ◽  
Vol 295-297 ◽  
pp. 1284-1288 ◽  
Author(s):  
De Wei Li ◽  
Zhi Jian Su ◽  
Li Wei Sun ◽  
Katsukiyo Marukawa ◽  
Ji Cheng He
Keyword(s):  
Continuous Casting ◽  
Swirling Flow ◽  
Casting Process ◽  
Continuous Casting Process ◽  
New Process ◽  
Electromagnetic Generator ◽  
Set Up ◽  
The Magnetic Field ◽  
Immersion Nozzle

Swirling flow in an immersion nozzle is effective on improving quality of casting block and casting speed in continuous casting process of steel. However, a refractory swirl blade installed in the nozzle is liable to cause clogging, which limit the application of the process. In this study a new process is proposed, that is a rotating electromagnetic field is set up around an immersion nozzle to induce a swirling flow in it by Lorentz force. New types of swirling flow electromagnetic generator are proposed and the effects of the structure of the generator, the coil current intensity and frequency on the magnetic field and on the flow field in the immersion nozzle are numerically analyzed.

Effect of Strain Rate on Nb(C,N) Precipitation in Micro Alloy Steel Slab

2012 ◽  
Vol 535-537 ◽  
pp. 633-638 ◽  
Author(s):  
Zheng Hai Zhu ◽  
Sheng Tao Qiu
Keyword(s):  
Continuous Casting ◽  
Strain Rate ◽  
Alloy Steel ◽  
Casting Speed ◽  
Casting Process ◽  
Continuous Casting Process ◽  
Precipitation Model ◽  
Strain And Strain Rate ◽  
Steel Slab

It was analyzed by strain-induced precipitation model that Nb(C,N) precipitation in micro alloy steel slab was effected by strain rate during continuous casting process. The results are as follows: The changing of casting speed could effect the time for 5%precipitation of Nb(C,N), which was decreasing with increasing casting speed at certain temperature and strain rate. Slab strain and strain rate were too small in bending zone and leveling zone. The effect of slab strain rate on Nb(C,N) precipitation could be ignore when Nb(C,N) precipitation in continuous casting process was studied.

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