Effect of Oxygen Concentration on Surface Hot Shortness of Steel Induced by Copper

Kondo, Yasumitsu; Tanei, Hiroshi

doi:10.2355/isijinternational.55.1044

Cited by 10 publications

(4 citation statements)

References 10 publications

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“…reported to cause hot shortness during solidification and hot rolling processes. [5][6][7][8][9][10][11] Up to date, many studies have addressed the removal of Cu and Sn. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] However, a proper removal process has not yet been established for practical applications.…”

Section: Interaction Coefficients Of Mo B Ni Ti and Nb With Sn In Mol...mentioning

confidence: 99%

Interaction Coefficients of Mo, B, Ni, Ti and Nb with Sn in Molten Fe–18mass%Cr Alloy

2022

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Section: Interaction Coefficients Of Mo B Ni Ti and Nb With Sn In Mol...mentioning

confidence: 99%

Interaction Coefficients of Mo, B, Ni, Ti and Nb with Sn in Molten Fe–18mass%Cr Alloy

2022

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“…9,10) As a consequence of the oxidation of elements with higher oxygen affinity, the Cu concentration at the steel/scale interface may steadily increase and, finally, a liquid metal Cu-rich phase may form and penetrate the steel along the grain boundaries, causing micro-defects that can lead to surface cracking due to subsequent stressing, e.g., during hot-rolling. 8,[11][12][13][14][15][16][17][18][19][20][21][22][23][24] In contrast to Sn and Sb, the presence of Ni can counteract this phenomenon as it increases the solubility of Cu in austenite and also the melting point of the Cu-rich phases. 6-8, 25, 26) Another risk for forming a low melting phase during high-temperature oxidation results from the presence of Si in steel.…”

Section: Introductionmentioning

confidence: 99%

Influence of Silicon and Tramp Elements on the High-temperature Oxidation of Steel in Direct Casting and Rolling Processes

Gaiser,

Presoly,

Bernhard

et al. 2024

ISIJ Int.

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Oxidation processes are unavoidable in continuous casting and further hot processing of steel. A deeper understanding of the occurring phenomena such as intergranular oxidation and liquid metal infiltration of grain boundaries is essential to continuously improve the quality of the products. In this study, oxidation experiments were performed with simultaneous thermal analysis for two thin slab casting and rolling applications under near-process conditions up to the point prior to the first reduction stage. The experiments were performed for two low-carbon steels contaminated with undesirable tramp elements (Cu, Sn, …). In addition, the two steels contain Silicon at different levels. The results show that for the "Endless Strip Production" process (ESP), intergranular oxidation is significantly less pronounced compared to a "Thin Slab Casting and Rolling process" with a gasfired tunnel furnace (TSCR TF). Due to the short process time at high temperatures in the ESP process, hardly any liquid metal infiltration by copper appears. In low silicon steel, intergranular oxidation results from various oxides, and liquid metal infiltration appears simultaneously in the TSCR TF process. Furthermore, the yield loss from oxidation is significantly higher in the TSCR TF process. The change from a natural gas combustion atmosphere to a hydrogen combustion atmosphere further increases the oxidation rate and results in a higher mass loss.

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“…For example, it is well known that copper in steel causes hot shortness by concentrated melting of copper onto the surface in hot-rolling process. [3,4] Therefore, these elements accumulate in iron, and they become a major problem in recycling ferrous scraps. The amount of available waste ferrous scrap with low copper content is limited, while the scrap with higher copper content is difficult to be recycled without being diluted with pig iron.…”

Section: Introductionmentioning

confidence: 99%

Removal of Tramp Elements from Molten Iron for Recycling Ferrous Scraps

Ono

2020

MSF

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The possibilities of removing impurities in molten iron by oxidation and evaporation, which are usual methods in metal refining, are firstly investigated. Of all the elements which are dissolved in molten iron, Cu, Sn Ni, Co, Mo and W are found to be difficult to be removed by such usual methods as oxidation and evaporation. The elements which are difficult to be removed in steel making when they are once dissolved into molten iron are called “tramp elements”. In recycling ferrous scraps, to begin with, it is important to keep iron from being mixed with tramp elements. But, it is necessary to develop a method to remove tramp elements, because it is impossible to avoid the contamination of these elements completely. In this work, several prospective methods to remove such tramp elements are discussed. Copper, which is one of the most important tramp elements in iron, can be removed by evaporation or by sulfurization, although it is not enough to apply them in practical use. As other methods, in this work, the possibilities to remove copper in molten iron by oxidation and by the use of calcium are proposed. It is found that copper and tin in iron can be decreased at the content of 0.2 to 0.4mass% and under 0.001mass%, respectively by oxidation. If pure calcium is equilibrated with iron directly at 1823K, the high distribution ratios, LSn(mass) (=(mass%Sn)in Ca-Pb/[mass%Sn]in Fe) = 3400 and LCu(mass) (=(mass%Cu)in Ca-Pb/[mass%Cu]in Fe) = 200 are expected.

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Effect of Oxygen Concentration on Surface Hot Shortness of Steel Induced by Copper

Cited by 10 publications

References 10 publications

Interaction Coefficients of Mo, B, Ni, Ti and Nb with Sn in Molten Fe–18mass%Cr Alloy

Interaction Coefficients of Mo, B, Ni, Ti and Nb with Sn in Molten Fe–18mass%Cr Alloy

Influence of Silicon and Tramp Elements on the High-temperature Oxidation of Steel in Direct Casting and Rolling Processes

Removal of Tramp Elements from Molten Iron for Recycling Ferrous Scraps

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