Technology Development for Controlling Slab Transverse Corner Crack of Typical Micro-alloyed Steels

Zhang, Hui; Yang, C.H.; Wang, Minglin; Huang, Tao; Li, Heping; Xuebing, Wang

doi:10.1016/s1006-706x(15)60016-4

Cited by 17 publications

(3 citation statements)

References 2 publications

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“…[20] Researchers proposed and studied the effect of chamfered mold on the control and improvement of corner transverse cracks. [21][22][23][24] The results showed that the cooling conditions and the stress state have been improved by the application of the chamfer molds. The temperature of the corner in the chamfered slab at the straightening section is higher than that of the conventional slab.…”

Section: Introductionmentioning

confidence: 99%

Research Mechanism of Formation on Transverse Corner Cracks in the Continuous Casting Slab of Peritectic Steel

Zhou

Yin

Liu³

et al. 2022

steel research int.

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To figure out the formation mechanism of transverse corner cracks at the inner and outer arc of peritectic steel slab, the metallurgical microscope, scanning electron microscope with energy‐dispersive X‐ray spectroscopy, and electron probe‐X‐ray microanalysis, are used to study cracks. High‐temperature mechanical properties and the stress distribution of the outer arc of the bending section under different roll gap schemes are studied and simulated. The outer arc cracks expand along the grain boundary, while the inner arc cracks not only extend along the grain boundary but also traverse along the grains. The outer arc cracks are mainly generated at the bending section and are formed and expanded along the ferrite film. The inner arc cracks' cracking temperature is higher than the temperature of austenite transformation to ferrite. The third brittle temperature ranges are 650–850 °C, and the transverse corner crack sensitivity zone is 680–837 °C. The inner arc cracks are generated because of the element segregation and low temperature of the corner and then extended at the straightening section, and new cracks exist. The weakened cooling intensity and bending earlier at the bending section help to reduce the equivalent stress on the slab. The optimized experiments are conducted, and the transverse corner cracks are reduced significantly.

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Section: Introductionmentioning

confidence: 99%

Research Mechanism of Formation on Transverse Corner Cracks in the Continuous Casting Slab of Peritectic Steel

Zhou

Yin

Liu³

et al. 2022

steel research int.

View full text Add to dashboard Cite

show abstract

“…The high-temperature plastic zone in a slab mainly exists in the mould and the secondary cooling zone. The mould shape [7] and the cooling rate [8] affect the solidification behaviour of the slab. The cooling rate in the secondary cooling zone [9] and the spray pattern of the nozzle [10] will affect the surface temperature of the slab.…”

Section: Introductionmentioning

confidence: 99%

Effect of the microstructure on the crack initiation during thermal cycling of Nb–Ti-bearing continuous casting slabs

Zeng

Qian

et al. 2020

Ironmaking & Steelmaking

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To discussed the influence of reheating and cooling on the crack initiation mechanism under the hot cycle mode of a continuous casting slab, during thermal cycling and analysed the relationship between the lower grain size and the crack initiation toughness under different temperature fluctuations. A thermal expansion tester and a Gleeble-3500 thermodynamical simulator were used to perform thermal processing experiments on the samples, where in the temperature fluctuations during solidification were 25 K, 50 K, and 75 K. Scanning electron microscopy (SEM), optical microscopy (OM) and other characterization methods were used to analyse the morphology, microstructure, thermoplasticity and residual stress of the cracked tensile test samples, which were taken from the Nb-Ti-bearing slabs. The result shows that with the intensification of the temperature-returning process, the grain size at the fracture and the size of the slab fracture toughness are increases, which leading to a decrease in crack initiation toughness.

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“…Hence, control of cracks formation is currently a crucial issue, as industry engineering develops rapidly [3]. The causes of cracks in various steel grades are different, and there are corresponding control methods for different types of cracks [4][5][6][7][8][9][10][11][12][13]. Wang et al [14] analyzed the effect of inclusions on the initiation of cracks.…”

Section: Introductionmentioning

confidence: 99%

Study on Surface Longitudinal Crack Formation of Typical Hypoeutectoid Steel Produced on a Caster with Billet and Slab

Lü

Wang

Guo

et al. 2019

Metals

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This paper investigates the formation mechanism of typical hypoeutectoid steel with longitudinal cracks produced on a caster with billet and slab. It was found that the microstructure of the proeutectoid ferrite is the most critical factor affecting the longitudinal crack. The formation conditions of the proeutectoid ferrite and the reasonable control direction were determined through experiments and calculations. High-temperature tensile experiments revealed that enhanced cooling did not cause additional cracks. Therefore, the final plan was to reduce the formation of proeutectoid ferrite by strengthening the cooling process. As a result, the optimized surface temperature quickly passed the phase transition region of the proeutectoid ferrite and no cracks were found in the optimized billet.

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Technology Development for Controlling Slab Transverse Corner Crack of Typical Micro-alloyed Steels

Cited by 17 publications

References 2 publications

Research Mechanism of Formation on Transverse Corner Cracks in the Continuous Casting Slab of Peritectic Steel

Research Mechanism of Formation on Transverse Corner Cracks in the Continuous Casting Slab of Peritectic Steel

Effect of the microstructure on the crack initiation during thermal cycling of Nb–Ti-bearing continuous casting slabs

Study on Surface Longitudinal Crack Formation of Typical Hypoeutectoid Steel Produced on a Caster with Billet and Slab

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