NbCN precipitation during solidification of HSLA steels

1986 ◽  
Vol 44 ◽  
pp. 578-579
Author(s):  
M.G. Burke ◽  
N.S. Pottore ◽  
A.J. DeArdo
Keyword(s):  
Continuous Casting ◽  
Research Program ◽  
Casting Process ◽  
Hot Ductility ◽  
Continuous Casting Process ◽  
Ongoing Research ◽  
Hsla Steels ◽  
Continuously Cast

A TEM/STEM investigation has been directed towards improving the quality of continuously cast HSLA steels. The considerable economic advantages to be derived from continuous casting of HSLA steels is being arrested by the greatly reduced hot-ductility of the con-cast structures. Therefore, to determine the cause of this reduction in ductility, a microstructura1 investigation was conducted using unidirectiona11y solidified ingots to simulate the continuous casting process. This is part of an ongoing research program on Nb-bearing HSLA steels.

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.

Optimization of CC Tail Bloom Operation

2012 ◽  
Vol 602-604 ◽  
pp. 478-481
Author(s):  
Hong Pan
Keyword(s):  
Continuous Casting ◽  
Casting Process ◽  
Continuous Casting Process

Cut-to-length bloom can not be controlled at the end of continuous casting process, and the yield of bloom is low. In order to improve the yield of bloom, the CC tail bloom system is proposed according to the bloom continuous casting conditions of equipment and process. Importantly, it is applied in the optimization of tail bloom operation in continuous casting process. Industrial tests show that the yield of bloom is improved obviously, with the quality of bloom is controlled as before.

scholarly journals The Influence of Ti on the Hot Ductility of Nb-bearing Steels in Simulated Continuous Casting Process.

2002 ◽  
Vol 42 (3) ◽  
pp. 273-282 ◽  
Author(s):  
Haiwen Luo ◽  
L. Pentti Karjalainen ◽  
David A. Porter ◽  
Heidi-Marja Liimatainen ◽  
Yan Zhang
Keyword(s):  
Continuous Casting ◽  
Casting Process ◽  
Hot Ductility ◽  
Continuous Casting Process ◽  
Bearing Steels

scholarly journals External Surface Quality of the Graphite Crystallizer as a Factor Influencing the Temperature of the Continuous Casting Process of ETP Grade Copper

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6309
Author(s):  
Paweł Kwaśniewski ◽  
Paweł Strzępek ◽  
Grzegorz Kiesiewicz ◽  
Szymon Kordaszewski ◽  
Krystian Franczak ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Surface Quality ◽  
External Surface ◽  
Cooling System ◽  
Casting Process ◽  
Electrical Energy ◽  
Wire Drawing ◽  
Roughness Coefficient ◽  
Continuous Casting Process

Today’s world is a place where lack of electrical energy would be unimaginable for most of society. All the conductors in the world, both aluminum and copper, have their origin in various types of casting lines where the liquid metal after crystallization is being processed into the form of wires and microwires. However, the efficiency of the continuous casting processes of metals and the final quality of the manufactured product strictly depend on the design of the used crystallizers, the materials used during its production and its quality. Research conducted in this paper focuses on the latter, i.e., external surface quality of the graphite crystallizer at the place of contact with the primary cooling system. In order to quantify its influence on the continuous casting process numerical analyses using the finite element method has been conducted, which results have been further confirmed during empirical tests in laboratory conditions. It has been proven with all of the proposed methods that the temperature of the obtained cast rod is closely linked to the aforementioned surface quality, as when its roughness coefficient surpasses a certain value the temperature of the obtained product increases almost twofold from approx. 150–170 °C to 300–320 °C. These values might influence the quality and final properties of the cast rod, the susceptibility to wire drawing process and possible formation of wire drawing defects and therefore be of much importance to the casting and processing industry.

scholarly journals Holding Time Influence on the Hot Ductility Behavior of a Continuously Cast Low Alloy Steel

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 64
Author(s):  
Marina Gontijo ◽  
Christian Hoflehner ◽  
Sergiu Ilie ◽  
Jakob Six ◽  
Christof Sommitsch
Keyword(s):  
Casting Process ◽  
Hot Ductility ◽  
Continuous Casting Process ◽  
Sem Images ◽  
Vacuum Atmosphere ◽  
Continuously Cast ◽  
Work Samples ◽  
Low Alloyed Steel ◽  
Reduction Of Area ◽  
Continuous Work

Cracking during the continuous casting process is undesirable and continuous work is being carried out to find further improvements and understand the mechanisms that lead to failure. Investigations on the hot ductility behavior of a continuously cast low alloyed steel using different holding times before straining were done in the present work. Samples were heated to melting temperature in a vacuum atmosphere and then cooled to one of the three test temperatures chosen: 750, 850, and 900 °C. When the desired temperature was reached, the sample was isothermally held for either 10, 90, 300, or 3600 s before the tensile test started, with a strain rate of 10−3 s−1. The reduction of area was measured, SEM images of the fractured surfaces were taken plus LOM images for the analysis of the microstructure. The results show that there was no significant change in the ductility at any of the temperatures until 300 s, with a change in behavior at 3600 s. This was further confirmed with the images and precipitation kinetics simulations. The results are described and compared.

Development and implementation of an innovative metal receiver for the intermediate ladles of caster slab

2019 ◽  
pp. 3-7
Author(s):  
M. Yu. Turchin ◽  
S. V. Sukharev ◽  
A. V. Zabolotsky ◽  
A. V. Shestakov ◽  
A. A. Berdyshev ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Working Conditions ◽  
Oxygen Converter ◽  
Intermediate Ladle ◽  
Casting Process ◽  
Special Design ◽  
Continuous Casting Process ◽  
Inner Surface ◽  
Continuously Cast

The features of the working conditions of intermediate ladles of caster slab are considered on the example of the 27-ton units of the oxygen-converter workshop of PJSC «Severstal». The results of mathematical modeling of hydrodynamics in an intermediate ladle with different turbulence dampers of the incoming jet are given. Designed, patented and implemented metal receiver (brand REYNSTREAM / REINSTREAM®) with a wave-like inner surface, designed to improve the quality of continuously cast billets, as well as providing increased stability and processability of the continuous casting process through a special design.. Ill. 6. Ref. 7.

A New Non-Sinusoidal Oscillation Waveform for Continuous Casting Mold

2010 ◽  
Vol 154-155 ◽  
pp. 334-337
Author(s):  
Xin Jin ◽  
Ting Zhi Ren
Keyword(s):  
Continuous Casting ◽  
Oscillation Frequency ◽  
Casting Process ◽  
Sinusoidal Oscillation ◽  
Continuous Casting Mold ◽  
Continuous Casting Process ◽  
Advanced Technique ◽  
Continuous Casting Slab ◽  
New Type

A new non-sinusoidal oscillation waveform which is shown by waveform distortional rate was advanced. The amplitude, oscillation frequency, waveform distortional rate and casting velocity were established for a computer model of the continuous casting process. The range of waveform distortional rate was ascertained. The choosing method of amplitude and oscillation frequency was given. These offered a theory basis to the application of the advanced technique. Industrial scale experiments showed the new type waveform is effective on improving the quality of continuous casting slab and reducing breakout.

scholarly journals Effect of High Temperature Deformation on the Hot Ductility of Nb Microalloyed Steel

2005 ◽  
Vol 500-501 ◽  
pp. 115-122 ◽  
Author(s):  
Faramarz Zarandi ◽  
Steve Yue
Keyword(s):  
Continuous Casting ◽  
High Temperatures ◽  
Microalloyed Steel ◽  
Casting Process ◽  
Temperature Deformation ◽  
Hot Ductility ◽  
Continuous Casting Process ◽  
Billet Surface ◽  
Nb Microalloyed Steel ◽  
Very High

Low hot ductility of steel at the straightening stage of the continuous casting process is a problem found in steels containing microalloying and/or certain alloying additions. The thermal schedule undergone by the billet surface in the mill has a significant effect on the hot ductility. In this work, thermomechanical processing was employed to alleviate the problem of hot ductility in the Nb-microalloyed steel. Specimens were melted in situ and subjected to the billet surface thermal schedule in order to generate a microstructure similar to that present at the straightening stage of the continuous casting process. Some deformation schedules were incorporated with the thermal schedule at very high temperatures, specifically during solidification, within the d-ferrite region, and during the d®g transformation, and the hot ductility was subsequently evaluated at the end of the thermal schedule where the straightening operation is performed. After the thermal schedule alone, the steel exhibited a very low hot ductility at the straightening stage. It was found that deformation at very high temperatures prior to the straightening stage had a considerable effect on the hot ductility, either detrimental or beneficial, depending on the region in which the deformation has been executed. The mechanisms leading to loss and improvement of hot ductility are explained in this paper.

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