Prevention of slab surface transverse cracking at Kashima n° 2 caster with Surface Structure Control (SSC) cooling

Baba, Naoki; Ohta, Kenji; Ito, Yukinobu; Kato, Toru

doi:10.1051/metal:2006163

Cited by 14 publications

(14 citation statements)

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“…In the SSC temperature scheme, there is a reheating period mainly due to heat conduction (physical and latent heat) from the core to surface or corner of the slab. Combining previous research [13][14][15][16][17][18], the reheating rate of 3 • C/s is assumed in this paper. 4# sample was heated to 1350 • C, held for 5 min, cooled to 600 • C with a cooling rate of 10 • C/s, held for 2 min, reheated to 1100 • C with a reheating rate of 3 • C/s, and then quenched.…”

Section: Ssc Process Test Schemementioning

confidence: 99%

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Effect of Different Thermal Schedules on Ductility of Microalloyed Steel Slabs during Continuous Casting

Yang

Xue

et al. 2019

Metals

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Ductility is the important indicator of transverse surface cracking susceptibility of slabs of microalloyed steels during continuous casting. Welding structure steel HG785 is selected to study the effect of different thermal schedule on ductility of microalloyed steel slabs during continuous casting in this paper. Surface Structure Control (SSC) cooling process parameters of HG785 microalloyed steel were confirmed by the aid of thermomechanical simulation experiment of Gleeble 3500. Results of tensile tests show that the ductilities of slabs under traditional thermal schedule and temperature fluctuation thermal schedule are very low in the III brittleness zone, and the reductions of area reach 29.7% and 26.0% at 800 °C, respectively. The ductility of slabs under SSC thermal schedule is obviously improved, since the pro-eutectoid ferrite film and aggregation of precipitates along the austenite grain boundary has not been discovered.

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Section: Ssc Process Test Schemementioning

confidence: 99%

“…At present, SSC technology has not been widely applied [15] and the key restraining factor is the unclear specific process parameters. The influence of SSC technology on the grain size and precipitate position of austenite has been disputed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Thermal Schedules on Ductility of Microalloyed Steel Slabs during Continuous Casting

Yang

Xue

et al. 2019

Metals

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“…It was suggested that the surface structure control cooling method obtained proper hot ductility of the slab corner, which minimized cracking. [ 19,20 ]…”

Section: Introductionmentioning

confidence: 99%

“…It was suggested that the surface structure control cooling method obtained proper hot ductility of the slab corner, which minimized cracking. [19,20] In the studies of transverse corner cracks mentioned earlier, the 3D morphology of cracks and the effect of sampling locations on hot ductility were rarely investigated. In the current study, samples were studied by metallography, and cracks were analyzed by a scanning electron microscope with energy-dispersive X-ray (SEM-EDX).…”

mentioning

confidence: 99%

Formation and Control of Transverse Corner Cracks in the Continuous Casting Slab of a Microalloyed Steel

Wang

Ren

Zhang

et al. 2021

steel research int.

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To investigate transverse corner cracks for a microalloyed steel continuous casting slab, the metallography, microtopography, and three‐dimensional (3D) morphology of cracks are studied, respectively. High‐temperature mechanical properties are investigated and compared from two positions where samples are extracted from both the slab corner and surface of the slab center. The thermal history of the slab is simulated and optimized experiments are conducted. Transverse corner cracks are generated on the valley of oscillation marks. Mold powder and wear elements of the mold are not detected. Microstructures are refined near the cracks. Cracks are generated in secondary cooling zones and the cracking temperature is higher than Ar3 temperature. The extension path of cracks is not linear and cracks extend along the grain boundary. The third brittle temperature ranges (TBTR) are 764–832 °C and 793–808 °C in the two positions, respectively. The temperature at the slab corner in the bending and straightening zone falls into the brittle zone during the original water cooling condition, leading to the formation of cracks. The secondary cooling scheme is optimized to prevent the temperature at the slab corner in the bending and straightening zone from entering the TBTR, significantly reducing the occurrence of transverse corner cracks.

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“…A new method for preventing transverse cracks on a slab surface, also known as the surface structure control cooling (SSC) method,3, 4 has recently been proposed to control the slab surface microstructure and second‐phase precipitation behavior of microalloyed steels. SSC suggests that an intensive cooling rate should be adopted to cool a slab down to 777°C (lower than the embrittlement temperature of 777°C) when the slab has just been cast out of the mould, after which the slab must be reheated up to 980°C by latent heat in the secondary cooling region.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Rates on the Second‐Phase Precipitation and Proeutectoid Phase Transformation of a Nb–Ti Microalloyed Steel Slab

Wen

Wang

2012

steel research int.

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During the continuous casting of low-carbon Nb-Ti microalloyed steel, control of the slab surface microstructure and the behavior of the second-phase precipitation are significantly influenced by the cooling rate. Through confocal laser scanning microscopy, the effect of the cooling rate on the behavior of ferrite precipitation both at the grain boundary and within the austenite was observed in situ and analyzed. The relationship between the cooling rate and precipitation of the microalloying elements on the slab surface microstructure was further analyzed by transmission electron microscopy. The results showed that the effect of microalloying element precipitation on proeutectoid ferrite phase transformation is mainly manifested in two aspects: (i) the carbonitrides of microalloying elements act as inoculant particles to promote nucleation of the proeutectoid ferrite and (ii) the carbon near the grain boundary is depleted when the microalloying elements precipitate into carbonitrides, inducing a decrease in the local carbon concentration and promoting ferrite precipitation.

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Prevention of slab surface transverse cracking at Kashima n° 2 caster with Surface Structure Control (SSC) cooling

Cited by 14 publications

References 0 publications

Effect of Different Thermal Schedules on Ductility of Microalloyed Steel Slabs during Continuous Casting

Effect of Different Thermal Schedules on Ductility of Microalloyed Steel Slabs during Continuous Casting

Formation and Control of Transverse Corner Cracks in the Continuous Casting Slab of a Microalloyed Steel

Effect of Cooling Rates on the Second‐Phase Precipitation and Proeutectoid Phase Transformation of a Nb–Ti Microalloyed Steel Slab

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