Continuous caster final electromagnetic stirrers position optimization using genetic programming

Kovačić, Miha; Župerl, Uroš

doi:10.1080/10426914.2023.2219317

Materials and Manufacturing Processes

2023

DOI: 10.1080/10426914.2023.2219317

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Continuous caster final electromagnetic stirrers position optimization using genetic programming

Miha Kovačić

Uroš Župerl

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Cited by 3 publications

References 42 publications

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Simulating Study on the Shrinkage Cavity and Porosity of a Microalloyed Steel Ingot

Wang,

Zhang

2024

steel research int.

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A 3D solidification model coupling heat transfer, solidification, and shrinkage porosity are established. The effect of melting temperature and cooling modes on the solidification time, shrinkage cavity, and porosity is investigated by the simulation. When the melting temperatures are 1510, 1530, and 1550 °C, the depth of the shrinkage cavity changes little, and they are about 44.8 mm. Maximal shrinkage porosity below the shrinkage cavity are 79.0%, 80.5%, and 82.0%, respectively. When the melting temperature is 1570 °C, the depth of the shrinkage cavity increases to 52.7 mm, and the maximal shrinkage porosity below the shrinkage cavity decreases to 75.5%. For three cooling modes, water cooling, air cooling, and furnace cooling, the cooling intensity gradually decreases, the solidification time increases, and the time of complete solidification is 72.0, 218.5, and 1382.2 s, respectively. With the decrease of cooling intensity, the shrinkage cavity shape and depth of the ingot vary obviously, and the depth of the V‐shaped shrinkage cavity is 39.9, 44.6, and 0 mm. The maximal shrinkage porosity is 76.0%, 82.0%, and 90.9%, respectively. Considering solidification time, shrinkage cavity, and porosity, water cooling mode should be used to obtain the dense internal quality of the steel ingot.

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Simulating Study on the Shrinkage Cavity and Porosity of a Microalloyed Steel Ingot

Wang,

Zhang

2024

steel research int.

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Optimization of Macro Segregation and Equiaxed Zone in High-Carbon Steel Use in Prestressed Concrete Wire and Cord Wire Application

Ayçiçek,

Solak

2023

Metals

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In this study, the relationship between macro segregation and the equiaxed zone in high-carbon grades with continuous casting parameters was investigated and optimized at the İsdemir iron and steel plant. The work was conducted for the 1080 quality of the SAE J403 standard. In this study, some parameters, such as casting speed, secondary cooling, EMS current value and EMS frequency value, were examined. When the results of the experiments are examined, it can be observed that the equiaxed zone in the macrostructure decreases significantly with the reduction of the EMS frequency value. The decrease in casting speed and increase in EMS current value caused an increase in the equiaxed zone. The increment in secondary cooling led to a decline in the equiaxed zone. Once the macro segregation results are examined, it can be seen that it is very important to optimize the continuous casting parameters in order to reduce the macro segregation results of—especially—carbon, sulfur and phosphorus elements. It has also been determined that the macro segregation values of carbon, sulfur and phosphorus elements are low in casting conditions where casting speed is low, and the EMS current value and EMS frequency value are high. In addition, macro segregation measurements of manganese, silicon, chromium and vanadium elements are found to be low under similar casting conditions. It is critical to optimize the continuous casting parameters before production, especially in high-carbon grades to be used for prestressed concrete wire and cord wire applications. As a result of the work conducted using the İsdemir billet continuous casting machine for the 1080-grade SAE J403 standard, aiming to optimize macro segregation and the equiaxed zone, the effective results have been achieved by using process parameters of 2.8 m/min casting speed, 360 A EMS current, 5 Hz EMS frequency and low secondary cooling intensity.

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Optimization of Billet Cooling after Continuous Casting Using Genetic Programming—Industrial Study

Kovačič,

Zupanc,

Vertnik

et al. 2024

Metals

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ŠTORE STEEL Ltd. is one of the three steel plants in Slovenia. Continuous cast 180 mm × 180 mm billets can undergo cooling to room temperature using a turnover cooling bed. They can also be cooled down under hoods or heat treated to reduce residual stresses. Additional operations of heat treatment from 36 h up to 72 h and cooling of the billets for 24 h, with limited capacities (with only two heat treatment furnaces and only six hoods), drastically influence productivity. Accordingly, the casting must be carefully planned (i.e., the main thing is casting in sequences), while the internal quality of the billets (i.e., the occurrence of inner defects) may be compromised. Also, the stock of billets can increase dramatically. As a result, it was necessary to consider the abandoning of cooling under hoods and heat treatment of billets. Based on the collected scrap data after ultrasonic examination of rolled bars, linear regression and genetic programming were used for prediction of the occurrence of inner defects. Based on modeling results, cooling under hoods and heat treatment of billets were abandoned at the casting of several steel grades. Accordingly, the casting sequences increased, and the stock of billets decreased drastically while the internal quality of the rolled bars remained the same.

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Continuous caster final electromagnetic stirrers position optimization using genetic programming

Cited by 3 publications

References 42 publications

Simulating Study on the Shrinkage Cavity and Porosity of a Microalloyed Steel Ingot

Simulating Study on the Shrinkage Cavity and Porosity of a Microalloyed Steel Ingot

Optimization of Macro Segregation and Equiaxed Zone in High-Carbon Steel Use in Prestressed Concrete Wire and Cord Wire Application

Optimization of Billet Cooling after Continuous Casting Using Genetic Programming—Industrial Study

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