Research on Soft Reduction Amount Distribution to Eliminate Typical Inter-dendritic Crack in Continuous Casting Slab of X70 Pipeline Steel by Numerical Model

2017 ◽  
Vol 36 (4) ◽  
pp. 359-372 ◽  
Author(s):  
Ke Liu ◽  
Chang Wang ◽  
Guo-liang Liu ◽  
Ning Ding ◽  
Qi-song Sun ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Triple Point ◽  
Pipeline Steel ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Internal Quality ◽  
Internal Crack ◽  
X70 Pipeline Steel ◽  
Soft Reduction ◽  
Plant Trials

AbstractTo investigate the formation of one kind of typical inter-dendritic crack around triple point region in continuous casting(CC) slab during the operation of soft reduction, fully coupled 3D thermo-mechanical finite element models was developed, also plant trials were carried out in a domestic continuous casting machine. Three possible types of soft reduction amount distribution (SRAD) in the soft reduction region were analyzed. The relationship between the typical inter-dendritic cracks and soft reduction conditions is presented and demonstrated in production practice. Considering the critical strain of internal crack formation, a critical tolerance for the soft reduction amount distribution and related casing parameters have been proposed for better contribution of soft reduction to the internal quality of slabs. The typical inter-dendritic crack around the triple point region had been eliminated effectively through the application of proposed suggestions for continuous casting of X70 pipeline steel in industrial practice.

scholarly journals Stiffness Analysis and Experimental Verification of Segment Frame of Continuous Casting Machine

2019 ◽  
Vol 253 ◽  
pp. 01001 ◽  
Author(s):  
Zhufeng Lei ◽  
Wenbin Su ◽  
Bingrui Hou ◽  
Qi Gao
Keyword(s):  
Continuous Casting ◽  
Continuous Casting Machine ◽  
Three Dimensional ◽  
Casting Machine ◽  
Practical Significance ◽  
Three Dimensional Model ◽  
Loading Test ◽  
Stiffness Analysis ◽  
Soft Reduction ◽  
Dynamic Soft Reduction

To verify the stiffness, the natural vibration and the reliability of the continuous casting machine in the configuration of dynamic soft reduction. Firstly, the three-dimensional model of the segment frame was established and the finite element simulation of the structure was carried out. Then, the deviation of the roll gap in the working process of the caster was measured by analog loading test. The results show that the stiffness of the segment frame of the continuous casting machine meets the requirements. Using dynamic soft reduction can improve the centerline segregation of casting slab in the process of continuous casting, which is of important practical significance in the production practice.

scholarly journals Investigation of internal defects formation reasons in copper billet obtained at rotary continuous casting machine (CCM)

2020 ◽  
Vol 28 (1) ◽  
pp. 48-54
Author(s):  
A.N. Smirnov ◽  
◽  
V.E. Ukhin ◽  
A.P. Verzilov ◽  
Ali Naseri ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Internal Defects

Sensorless electric drive of the mixture supply system in the mold of the continuous steel casting installation

2021 ◽  
pp. 16-21
Author(s):  
K. V. Litsin ◽  
D. M. Utyamishev
Keyword(s):  
Continuous Casting ◽  
Electric Drive ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Steel Production ◽  
Angular Speed ◽  
Quality Level ◽  
Actual Direction ◽  
Vector Control System ◽  
The Cost

The system of automatic feeding of the slag-forming mixture into the mold of the continuous casting machine was investigated in this article. The necessity of using a slag-forming mixture in the process of steel production has been substantiated. The proofs are given that the consumption of the slag-forming mixture significantly affects the cost of the final product. The quality level of the final product depends on the uniformity and consistency of the mixture supply to the crystallizer. Therefore, the actual direction is the automation of the process of feeding the slag-forming mixture into the mold of the continuous casting machine. The description of the developed automatic installation, which implements the supply of slag-forming mixture, is presented. The necessity of using a sensorless electric drive for moving the trolley has been substantiated. A simulation model of a bogie electric drive with a vector control system based on sensorless determination of the angular speed of the engine has been developed. The description of the method for determining the angular speed of the motor based on the known values of phase voltages is given. The simulation of the developed electric drive system in the Matlab Simulink program, confirming the adequacy of the developed system. The introduction of a sensorless electric drive into the system for feeding the mixture into the mold of the continuous casting machine will increase the reliability of the entire system and reduce its weight and dimensions.

scholarly journals Study of the Influence of Intermix Conditions on Steel Cleanliness

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 852 ◽  
Author(s):  
Branislav Bul’ko ◽  
Marek Molnár ◽  
Peter Demeter ◽  
Dana Baricová ◽  
Alena Pribulová ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Negative Impact ◽  
Cast Steel ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Chemical Compositions ◽  
Negative Effect ◽  
Type Size ◽  
Steel Cleanliness ◽  
Steel Grades

Modern steel plants produce today a large portfolio of various steel grades, many for end-uses demanding high quality. In order to utilize the maximum productivity of the continuous-casting machine, it is sometimes necessary to cast steel grades with different chemical compositions in one sequence. It is important, therefore, to know the possibilities of a specific continuous-casting machine to make the Intermix connections as short as possible. Any interference with established procedures may, however, have a negative impact on the cleanliness of the cast steel. Using physical and numerical simulation tools, it was found that reducing the steel level in the tundish during the exchange of ladles makes it possible to shorten the transition zone. However, when the steel level is reduced, the flow of steel is impaired, which can have a negative effect on the cleanliness of the cast steel and, in extreme cases, may even lead to entrapment of slag in the mold. The cleanliness of cast steel was evaluated using one of the most advanced tools for automatic steel cleanliness evaluation, AZtecFeature (Oxford Instruments, Abingdon, UK), which enables determination of the type, size, distribution, and shape, as well as the chemical composition, of individual types of non-metal inclusions.

Microstructural Evolution of Electromagnetically Stirred Al Alloy during Isothermal Reheating in Solid-Liquid Region

2005 ◽  
Vol 486-487 ◽  
pp. 338-341
Author(s):  
Dock Young Lee ◽  
Ki Bae Kim ◽  
Do Hyang Kim
Keyword(s):  
Continuous Casting ◽  
Casting Speed ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Electromagnetic Stirring ◽  
Al Alloy ◽  
Liquid Region ◽  
Α Phase ◽  
Solid Liquid ◽  
Holding Temperature

The effects of reheating in solid-liquid region on the microstructure of electromagnetically stirred Al alloy have been investigated. The billet of Al alloy was produced at a various casting speed from 200 to 500 mm/min in a continuous casting machine with an electromagnetic stirring device. The microstructure of the billet, which was isothermally reheated in a solid-liquid region during holding for from 0.5 to 15 min, was examined. The roundness and size of primary α phase of electromagnetic stirred Al alloy was measured according to the reheating time. The roundness of primary α phase was obtained a minimum during holding for from 3 to 7 min at a holding temperature of 584°C and was deteriorated at a longer reheating time due to a dominant coalescence. Also the spheroidization of primary α phase during reheating in solid-liquid region was significantly dependent on initial microstructure of the billet.

Calculating the heat transfer in the wall of a continuous casting machine with cylindrical and slotted channels

2007 ◽  
Vol 27 (5) ◽  
pp. 256-259
Author(s):  
V. I. Kadoshnikov ◽  
I. M. Yachikov ◽  
V. I. Zav’yalov ◽  
A. A. Podosyan
Keyword(s):  
Heat Transfer ◽  
Continuous Casting ◽  
Continuous Casting Machine ◽  
Casting Machine
Sign in / Sign up

Export Citation Format

Share Document