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.

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.

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.

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.

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

Analysis of the off-corner subsurface cracks of continuous casting blooms under the influence of soft reduction and controllable approaches by a chamfer technology

2019 ◽  
Vol 116 (3) ◽  
pp. 310 ◽  
Author(s):  
Nanfu Zong ◽  
Hui Zhang ◽  
Yang Liu ◽  
Zhifang Lu
Keyword(s):  
Continuous Casting ◽  
Cross Section ◽  
Mechanical Model ◽  
Stress Fields ◽  
Temperature History ◽  
Stress Distributions ◽  
Soft Reduction ◽  
Reduction Operation ◽  
Subsurface Cracks ◽  
Reduction Region

In the current study, the morphology of the off-corner subsurface cracks located on the cross section of continuous casting bloom under a soft reduction operation was observed. A 3D thermo-mechanical model was adopted to calculate the temperature history, bulging deformation and stress distributions in the reduction region, and then to analyze the formation of the off-corner subsurface cracks under the influence of soft reduction. The results showed that the off-corner subsurface cracks can be formed under the influence of the extensive stress fields which develop in the cracking temperature range, especially located on the loosed side of the bloom corner region. Adjusting the chamfer angle and chamfer length can decrease stress concentration and bulging deformation to minimize the risk of off-corner subsurface cracks during the soft reduction operation.

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
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