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.

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.

Heat Transfer and Solidification Model of Slab Continuous Casting Based on Nail-Shooting Experiments

2015 ◽  
Vol 1088 ◽  
pp. 153-158 ◽  
Author(s):  
An Gui Hou ◽  
Yi Min ◽  
Cheng Jun Liu ◽  
Mao Fa Jiang
Keyword(s):  
Heat Transfer ◽  
Continuous Casting ◽  
Liquid Core ◽  
Casting Process ◽  
Soft Reduction ◽  
Slab Continuous Casting ◽  
Solidification Model ◽  
Core Length ◽  
Measurement Results ◽  
Heat Transfer And Solidification

A heat transfer and solidification model of slab continuous casting process was developed, and the nail-shooting experiments were carried out to verify and improve the prediction accuracy. The comparison between the simulation and the measurements results showed that, there exists difference between the model predicted liquid core length and the calculated liquid core length according to the measurement results of the solidification shell thickness. In the present study, the value of constant a in the heat transfer coefficient calculation formula was corrected through back-calculation, results showed that, the suitable value of a is 31.650, 33.468 and 35.126 when the casting speed is 0.8m·min-1, 0.9m·min-1 and 1.0m·min-1 respectively, which can meet the liquid core length of the measurement results. The developed model built a foundation for the application of dynamic secondary cooling, and dynamic soft reduction.

Application of the Dynamic Soft-Reduction Technology on the No.4 Slab Continuous Caster of Bayi Steel

2013 ◽  
Vol 652-654 ◽  
pp. 2441-2445
Author(s):  
Jian Feng Cao ◽  
Ke Feng ◽  
Zhi Wei Han
Keyword(s):  
Control Function ◽  
Continuous Caster ◽  
Reduction Process ◽  
Internal Quality ◽  
Internal Crack ◽  
Slab Caster ◽  
Soft Reduction ◽  
Reduction Function ◽  
Dynamic Soft Reduction ◽  
Slab Continuous Caster

The revamping & upgrading work has been done smoothly for the old soft-reduction system of the No.4 slab continuous caster in Bayi steel, as a result, all the segments (include both arc segments and level segments ) now have the dynamic soft-reduction function, which have been put into the industrial application successfully. Through the production practice, we can see that, after the revamping project, the dynamic soft-reduction function could be applied normally both in the arc segments and in the level segments for the No.4 slab caster, the whole soft-reduction process has been conducted steady and smoothly, the precision of roll gap control is good, the L2 model always makes an exact trace for the casting process and has the advanced algorithm, the L1 program has the reasonable control function and the reliable execution. When the soft-reduction action was executed in the unbending segment (Seg.7), there was no internal crack taking place for all the slabs, and the internal quality of slab such as center segregation was improved obviously, which had shown the metallurgical effect of the dynamic soft-reduction technology fully.

scholarly journals Methods for Assessment of Slab Centre Segregation as a Tool to Control Slab Continuous Casting with Soft Reduction

2006 ◽  
Vol 46 (12) ◽  
pp. 1845-1851 ◽  
Author(s):  
Hubert Preßlinger ◽  
Sergiu Ilie ◽  
Peter Reisinger ◽  
Andreas Schiefermüller ◽  
Andreas Pissenberger ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Soft Reduction ◽  
Slab Continuous Casting

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.

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