Study and Application of a Simplified Soft Reduction Amount Model for Improved Internal Quality of Continuous Casting Bloom

2017 ◽  
Vol 88 (12) ◽  
pp. 1700176 ◽  
Author(s):  
Yujun Li ◽  
Liang Li ◽  
Jiaquan Zhang
Keyword(s):  
Continuous Casting ◽  
Internal Quality ◽  
Soft Reduction

scholarly journals Industrial Application of Mechanical Reduction on Continuous Casting of Bearing Steel Bloom

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2280
Author(s):  
Xinghua Chen ◽  
Wei Deng ◽  
Shuai Niu
Keyword(s):  
Continuous Casting ◽  
Industrial Application ◽  
Reduction Rate ◽  
Bearing Steel ◽  
Internal Quality ◽  
Soft Reduction ◽  
Solidification Model ◽  
Industrial Experiments ◽  
Reduction Region

Industrial experiments of mechanical soft reduction in continuous casting were conducted in the present study aiming to improve the internal quality of the bearing steel blooms. Two methods were developed to verify the solidification model for a reliable crater end in the caster, which is provided by SMS CONCAST. The verified solidification model was applied to determine the solidification status of the bloom and provides theoretical reduction region. Several trials were conducted to study the optimization of the reduction rate regarding the V-shaped and centerline segregation of the bloom. The results show an obvious improvement of internal quality in the bearing steel bloom by applying appropriate reduction during casting.

Effects of heavy reduction technology on internal quality of continuous casting bloom

2017 ◽  
Vol 46 (3) ◽  
pp. 227-234 ◽  
Author(s):  
Jun-pu Zhao ◽  
Liu Liu ◽  
Wei-wei Wang ◽  
Wei-ji Zhou ◽  
Hui Lu
Keyword(s):  
Continuous Casting ◽  
Internal Quality

Industrial Application of the Packaged Soft-Reduction Technology for Slab Continuous Casting

2012 ◽  
Vol 538-541 ◽  
pp. 1222-1227
Author(s):  
Ke Feng ◽  
Zhi Wei Han ◽  
Jian Feng Cao ◽  
Yi Wen Kong ◽  
Shui Gen Wang
Keyword(s):  
Continuous Casting ◽  
Industrial Application ◽  
Hydraulic System ◽  
Economic Benefits ◽  
Process Models ◽  
Control Mode ◽  
Internal Quality ◽  
Soft Reduction ◽  
Slab Continuous Casting ◽  
Reduction Function

Based on the conception of integration and optimization of process, mechanical, electric and hydraulic system, the advanced CISDI packaged soft-reduction technology for slab continuous casting with our full intellectual property rights has been developed successfully, which consists of the metallurgical process models with strong function and advanced arithmetic, the segment equipments with optimized structure and high strength, the basic automation program with full inspection and control function, the reliable stable hydraulic system and automatic system. It contains two control modules, viz., the static soft-reduction function & dynamic soft-reduction function, and three gap-adjustment modes, viz., the position-control mode, pressure-control mode & soft-clamping mode. From the opinions of equipment protection and production safety, some functional mechanism such as segment ordinal action, gap self-adapting adjustment, forced protection for breakout prediction, and etc., have been adopted. The whole system has been put into the industrial practice on the No.6 slab caster of Liusteel China, which has shown the smooth caster operation, the steady running of system, and the good metallurgical effects on improvement of internal quality of slab like center segregation and center porosity. The industrial application of CISDI soft-reduction technology has brought the rising of output proportion of high-class steel grades and the increasing of qualified rate for slab quality inspection, which has resulted in the distinct economic benefits for Liusteel group.

Influence of Soft Reduction on Internal Quality of High Carbon Steel Billets

2006 ◽  
Vol 77 (7) ◽  
pp. 485-491 ◽  
Author(s):  
Wolfgang Bleck ◽  
Wenjun Wang ◽  
Raimund Bülte
Keyword(s):  
Carbon Steel ◽  
High Carbon Steel ◽  
Internal Quality ◽  
High Carbon ◽  
Soft Reduction

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.

High-efficiency continuous casting of GCr15 bearing steel bloom based on cooperative control technique of complex electromagnetic stirring and soft reduction

2019 ◽  
Vol 116 (6) ◽  
pp. 621 ◽  
Author(s):  
Hanghang An ◽  
Yan Ping Bao ◽  
Min Wang ◽  
Quan Yang ◽  
Xiang Hong Wang ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Casting Speed ◽  
Bearing Steel ◽  
Average Degree ◽  
Electromagnetic Stirring ◽  
Control Technique ◽  
Internal Quality ◽  
Soft Reduction ◽  
Carbon Segregation ◽  
Gcr15 Bearing Steel

GCr15 bearing steel exhibits comparatively serious center macro-segregation in the continuous casting of bloom with the increase of casting speed. In the present work, the influence of complex electromagnetic stirring (M + F-EMS) and mechanical soft reduction (MSR) on the center macro-segregation in the continuous casting of 220 × 260 mm blooms of GCr15 bearing steel have been comparatively investigated to increase casting speed in order to ensure a good internal quality. Based on numerical simulation and experiments, M + F-EMS and MSR have been comprehensively evaluated and compared by combination of industrial trials. The results show that center carbon segregation first decreases and then increases with the increase of casting speed in both processes without optimization. For M + F-EMS process, when casting speed increases from 0.75 to 0.85 m · min−1, the average degree of center carbon segregation decreases from 1.2 ∼ 1.26 to 1.18 ∼ 1.25 by asymmetrical optimization; with regard to combination of M + F-EMS and MSR process, when casting speed increases from 0.75 to 0.9 m · min−1, the average degree of center carbon segregation decreases from 1.2 ∼ 1.26 to 1.08 ∼ 1.1 and the solute element distribution becomes homogeneous by optimization. In comparison, significant reduction of the center macro-segregation with the increase of casting speed can be achieved for combination of M + F-EMS and MSR process, however, it is infeasible for M + F-EMS process in the present technology situation.

Research on Scheme of the Continuous Casting Slab Internal Quality Inspection Based on BP Neural Network

2013 ◽  
Vol 380-384 ◽  
pp. 4383-4386
Author(s):  
Xin Li ◽  
Jie Sun ◽  
Xiao Feng Xie
Keyword(s):  
Neural Network ◽  
Continuous Casting ◽  
Bp Neural Network ◽  
Internal Quality ◽  
Bp Artificial Neural Network ◽  
Continuous Casting Slab ◽  
Central Segregation ◽  
Improved Bp Algorithm ◽  
Continuous Casting Billet

The internal quality of continuous casting billet mainly refers to the low power structure, center segregation, inner crack and the levels of inclusions. It seriously affects the comprehensive performance of steel and rolling slab of the casting billet center segregation and crack existing. The influence rules of the slab internal quality about the process and the factors of equipment combining with field production data have been discussed in this paper. Then using the improved BP algorithm with added momentum item and the prediction model of central segregation of continuous casting billet base on BP artificial neural network have been built.

Improvement of internal quality of large section concast bloom with soft reduction technology and induction heater in tundish

1990 ◽  
Vol 87 (9) ◽  
pp. 777-784
Author(s):  
A. Shiraishi ◽  
K. Iwata ◽  
H. Tomono ◽  
H. Nagahata ◽  
A. Mori
Keyword(s):  
Internal Quality ◽  
Large Section ◽  
Soft Reduction ◽  
Induction Heater

Influence of technology parameters of free-cutting steel continuous casting on the billet internal structure

2020 ◽  
Vol 76 (2) ◽  
pp. 139-142
Author(s):  
A. T. Kunakbaeva ◽  
A. M. Stolyarov ◽  
M. V. Potapova
Keyword(s):  
Regression Analysis ◽  
Continuous Casting ◽  
Internal Structure ◽  
Sulfur Content ◽  
Manganese Content ◽  
High Quality ◽  
Correlation And Regression Analysis ◽  
Cutting Steel ◽  
Continuously Cast

Free-cutting steel gains specific working properties thanks to the high content of sulfur and phosphorus. These elements, especially sulfur, have a rather high tendency to segregation. Therefore, segregation defects in free-cutting steel continuously cast billets can be significantly developed. The aim of the work was to study the influence of the chemical composition of freecutting steel and casting technological parameters on the quality of the macrostructure of continuously cast billets. A metallographic assessment of the internal structure of cast metal made of free-cutting steel and data processing by application of correlation and regression analysis were the research methods. The array of production data of 43 heats of free-cutting steel of grade A12 was studied. Steel casting on a five-strand radial type continuous casting machine was carried out by various methods of metal pouring from tundish into the molds. Metal of 19 heats was poured with an open stream, and 24 heats – by a closed stream through submerged nozzles with a vertical hole. High-quality billets had a cross-sectional size of 150×150 mm. The macrostructure of high-quality square billets made of free-cutting steel of A12 grade is characterized by the presence of central porosity, axial segregation and peripheral point contamination, the degree of development of which was in the range from 1.5 to 2.0 points, segregation cracks and strips – about 1.0 points. In the course of casting with an open stream, almost all of these defects are more developed comparing with the casting by a closed stream. As a result of correlation and regression analysis, linear dependences of the development degree of segregation cracks and strips both axial and angular on the sulfur content in steel and on the ratio of manganese content to sulfur content were established. The degree of these defects development increases with growing of sulfur content in steel of A12 grade. These defects had especially strong development when sulfur content in steel was of more than 0.10%. To improve the quality of cast metal, it is necessary to have the ratio of the manganese content to the sulfur content in the metal more than eight.

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