Cleanliness of Ti-bearing Al-killed ultra-low-carbon steel during different heating processes

Guo, Jifeng; Bao, Yanping; Wang, Min

doi:10.1007/s12613-017-1529-8

Cited by 13 publications

(4 citation statements)

References 14 publications

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“…Aluminum deoxidized IF steel has become the main material for automobile outer panel production in the world because of its good deep drawing performance and economy. 1,2) According to the application characteristics of automobile outer plate, IF steel is required to have high cleanliness to ensure that the steel plate has good surface quality and deep stamping performance. 3,4) In recent years, the majority of research institutes and iron and steel enterprises have been committed to improving the cleanliness of aluminum deoxidized IF steel by optimizing the traditional…”

Section: Introductionmentioning

confidence: 99%

Effect of Rare Earth Ce on the Morphology and Distribution of Al2O3 Inclusions in High Strength IF Steel Containing Phosphorus during Continuous Casting and Rolling Process

et al. 2021

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This paper analyzes the control of Al 2 O 3 inclusions in high strength IF steel containing phosphorus. The inclusion statistics and two-dimensional morphology of samples with slab thickness of 1/8, 1/2 and 7/8, and the samples with hot rolling, cold rolling and continuous annealing processes were observed and compared by ASPEX SEM. In addition, the three-dimensional morphology of the inclusions extracted from the electrolysis of slab samples and the original morphology of inclusions from the rolling process samples were observed and compared. The results show that: When rare earth Ce is added to the steel, the combination of Ce with activity O and S in the steel has lower Gibbs free energy, and it is easy to generate CeAlO 3 , Ce 2 O 2 S, Ce 2 O 3 , composite rare earth inclusions combined with other inclusions. The concentration and supersaturation of aluminum and oxygen are reduced, and the ability of single particle Al 2 O 3 to aggregate into large-scale cluster inclusions is reduced. The average size of Al 2 O 3 inclusions decreased from 5-7 μm to 2-5 μm in each thickness direction. The morphology of inclusions changed from long strip, sharp angle and cluster to spherical, spindle and round surface. Meanwhile, the number density of Al 2 O 3 inclusions increase, but the area density decreases during continuous casting and rolling process. The size of Al 2 O 3 inclusions in the steel without rare earth addition is mostly large-scale strip shape, and it is crushed during rolling,resulting quality defects on the exposed surface and causing the stamping crack problem. When rare earth is added to the steel, the inclusions in the steel change into small-sized circular inclusions with dispersion distribution. The modulus of elasticity is close to that of the steel matrix, which will not affect the continuity of the strip structure, and is beneficial to the relevant properties of the product.

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Section: Introductionmentioning

confidence: 99%

Effect of Rare Earth Ce on the Morphology and Distribution of Al2O3 Inclusions in High Strength IF Steel Containing Phosphorus during Continuous Casting and Rolling Process

et al. 2021

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“…Since the slag in the refining process could control and remove inclusions from the molten steel effectively 5 , slag systems and models were designed to investigate the influence of the mechanical properties [6][7][8] . The improved methods for controlling inclusions have thus been reported [9][10][11][12] . When the Al 2 O 3 content in the refining slag increased from 14.71% to 22.3%, the number density of inclusions increased from 5.2 to 6.5 and the largest size of inclusion raised from 7.3 to 8.3 μm in spring steel 13 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Al2O3 in Refining Slag on the Cleanliness and Fatigue Property of Ultra-low-carbon Automotive Steel

2022

Mat. Res.

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The influence of Al 2 O 3 content in refining slag on the cleanliness and fatigue property of ultra-lowcarbon (ULC) automotive steel were investigated based on the industrial experiments. The inclusionadsorption capacity of the refining slag was calculated and the total [O] (T.O) content of ULC automotive steel was measured. The number density, size distribution and morphology of inclusions were analyzed and their effects on the cleanliness and fatigue property of ultra-low-carbon (ULC) automotive steel were investigated. The results showed that as the Al 2 O 3 content in refining slag increased from 19.92% to 39.73%, the inclusion-adsorption capacity of ULC automotive steel decreased from 210.30 down to 57.12, and the fatigue life from 1.4x10 4 down to 0.9x10 4 cycles, while the T.O content of steel increased from 12 up to18 ppm and the inclusion number density from 4 up to 9 per mm 2 .

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“…Carryover converter slag, open-eye by gas bubbling, weak oxide components in refractories and fluxes, and contamination in ferroalloys may be a few of the sources. It causes the unwanted formation of oxide inclusions and clogs in nozzles in steelmaking and casting processes, [3,4] and eventually induces defects in the cast product.…”

Section: Introductionmentioning

confidence: 99%

Effect of Trace of Oxygen in Ar Gas on Initial Growth of Nozzle Clogging Deposits on SEN for Ti Added Ultra‐Low C Steel Casting

Lee

Kim

Kang

et al. 2022

steel research int.

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The possibility of reoxidation of Ti‐ultra‐low C (Ti‐ULC) steel by a trace of oxygen in Ar gas, which is injected in a submerged entry nozzle (SEN), is investigated. A commercial‐grade unpurified Ar gas with PO2 = ≈10−4 bar and a purified Ar gas with PO2 = ≈10−18 bar by a set of cleaning kits are employed. Preliminary thermodynamic calculations revealed that the unpurified Ar gas could cause significant oxidation of the Ti‐ULC steel, irrespective of the steel composition, while the purified Ar gas did not oxidize the steel. A series of laboratory‐scale oxidation experiments are carried out using various Ti‐ULC steel samples and the two Ar gases. The oxidation under unpurified Ar gas causes the oxidation of all the samples but only on the surface, in partial agreement with the thermodynamic calculation. The partial agreement between the calculation and the experiment is explained by the availability of oxygen and other metallic elements. It is found that the trace of oxygen in a commercial grade of Ar gas could cause reoxidation of Ti‐ULC steel in an SEN, which may be no better than the reoxidation by CO gas generated by the carbothermic reaction in the SEN refractory. A purity control of Ar gas is recommended.

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Cleanliness of Ti-bearing Al-killed ultra-low-carbon steel during different heating processes

Cited by 13 publications

References 14 publications

Effect of Rare Earth Ce on the Morphology and Distribution of Al<sub>2</sub>O<sub>3</sub> Inclusions in High Strength IF Steel Containing Phosphorus during Continuous Casting and Rolling Process

Effect of Rare Earth Ce on the Morphology and Distribution of Al<sub>2</sub>O<sub>3</sub> Inclusions in High Strength IF Steel Containing Phosphorus during Continuous Casting and Rolling Process

Effect of Al2O3 in Refining Slag on the Cleanliness and Fatigue Property of Ultra-low-carbon Automotive Steel

Effect of Trace of Oxygen in Ar Gas on Initial Growth of Nozzle Clogging Deposits on SEN for Ti Added Ultra‐Low C Steel Casting

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