Soft Reduction at a Round Bloom Caster: Implementation and Results

Rauter, Wolfgang; Reiter, Jürgen; Srienc, Klaus; Brandl, Werner; Erker, Mario; Huemer, K.; Mair, Alexander

doi:10.1007/s00501-014-0309-2

Cited by 11 publications

(9 citation statements)

References 1 publication

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“…All these methods tend to improve the homogeneity and the amount of equiaxed crystals in the cast slab [5]. Nevertheless, the efficiency of these techniques is limited by different reasons, such as submerged entry nozzle (SEN) clogging, the size and shape of the slab [6], etc. Generally, the slab quality can be improved by generating a large amount of equiaxed grains and promoting a columnar to equiaxed transition (CET).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Solidification in the Cast Mold with a Consumable Cooler Introduced Inside

Niu

Liu

et al. 2019

Metals

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The microstructure is of great significance for the stability and mechanical performance of the cast slab. Recently, an innovative technology of feeding a consumable cooler into the mold has been proposed to improve the internal quality of castings. But the mechanism is not clear. In the present work, a water-cooled transparent laboratory equipment was set up and solidification of NH4Cl-70%H2O solution was studied to observe the in-situ growth and sedimentation of crystals. The experiments were conducted with and without adding a consumable cooler. Morphology variation of the solidification structure was visualized and temperature distribution during the process was recorded. Results show that introduction of the consumable cooler significantly reduces the temperature of the central zone. Melting of the consumable cooler can supply a large quantity of equiaxed crystals, which prevent the growth of columnar dendrites and thereby promote columnar to equiaxed transition (CET). Moreover, the enhanced convection shows an effect of grain refinement.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Solidification in the Cast Mold with a Consumable Cooler Introduced Inside

Niu

Liu

et al. 2019

Metals

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“…However, increasing field intensity, deterioration upon the attained quality improvement was recorded. Some interesting fundamental research, as well as industrial achievements regarding medium and high carbon steels were presented in the recent European continuous casting conference [6][7][8][9][10][11][12][13][14][15][16][17][18], revealing the broad research and practice that may be developed in the field during the coming years. In Ref.…”

Section: Literature Review Mostly Oriented To Quality Problems For Mementioning

confidence: 99%

“…It was explained on the basis of BN formation after the initial MnS formation; castability is therefore reduced for these types of steels. The implementation of soft reduction at the Voestalpine Stahl Donawitz bloom caster for the continuous casting of high carbon (0.80-1.05%C) rounds exhibited positive quality results [14]. On the other hand, the EMS underlined the proper positioning limitations that made the implementation very difficult to attain reliable and reproducible quality results.…”

Section: Literature Review Mostly Oriented To Quality Problems For Mementioning

confidence: 99%

Evaluation of Solidification Times for Medium and High Carbon Steels Based upon Heat Transfer and Solidification Phenomena in the Continuous Casting of Blooms

Sismanis¹

2015

Heat Transfer Studies and Applications

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“…However, unlike the rectangle billet or bloom, SR has not yet been widely used in round products. Rauter [14] applied SR on Ø230 mm round billet of high carbon steel by double-roll segment. The V-segregation and central porosity were almost vanished.…”

Section: Introductionmentioning

confidence: 99%

Control of Shrinkage Porosity and Spot Segregation in Ø195 mm Continuously Cast Round Bloom of Oil Pipe Steel by Soft Reduction

Zhang

et al. 2020

Metals

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Based on the Ø195 mm round bloom continuous casting of oil pipe steel, a two dimensional thermal-mechanical coupled model has been developed to investigate the deformation behavior of round bloom during soft reduction (SR) in the reduction force mode. Good agreement was achieved in surface temperature, shell thickness and contact zone width from modeling and measurement. Under the same reduction force, the reduction amount of round bloom at the front unit is much larger than back unit. Moreover, due to its higher temperature and lower center solid fraction, the deformation penetration before solidification is much stronger than that after solidification. Considering the limitation of the round bloom ovality, the maximum allowable force in reduction unit is calculated. According to the simulation results, a multi-unit soft reduction plan was proposed and carried out on the Ø195 mm round bloom. After the reduction process of No.1 to No.3 withdrawal units, the shrinkage porosity in the center of the round bloom was almost vanished, while the number and size of spot segregation were significantly reduced. Moreover, the oil pipe produced by the round bloom with SR got a better resistance to sulfide stress corrosion (SSC). It indicates that SR is an effective technology for the round bloom to control the shrinkage porosity and spot segregation in the continuous casting.

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Soft Reduction at a Round Bloom Caster: Implementation and Results

Cited by 11 publications

References 1 publication

Experimental Investigation of Solidification in the Cast Mold with a Consumable Cooler Introduced Inside

Experimental Investigation of Solidification in the Cast Mold with a Consumable Cooler Introduced Inside

Evaluation of Solidification Times for Medium and High Carbon Steels Based upon Heat Transfer and Solidification Phenomena in the Continuous Casting of Blooms

Control of Shrinkage Porosity and Spot Segregation in Ø195 mm Continuously Cast Round Bloom of Oil Pipe Steel by Soft Reduction

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