Effects of C and P on surface hot shortness of steel due to Cu mixed from steel scrap.

Uchino, Hiroshi; Nagasaki, Chihiro; Kaga, Masashi; Seo, Seok-Jong; Asakura, Kentaro; Shibata, Koji

doi:10.2978/jsas.13.260

Cited by 5 publications

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“…Uchino et al 8) showed that the oxidation rate of a 0.1%C-0.02%P steel is much higher in LNG combustion gas than in air, whereas the oxidation rate of a 0.5%C-0.02%P steel is similar in both atmospheres and the oxidation rate of 0.5%C-0.001%P steel is a little slower in LNG than in air. Therefore, effects of atmosphere depend on the chemical composition of steel.…”

Section: Effects Of Atmosphere Of Heating Furnace and Deformation Ratementioning

confidence: 99%

“…3, the effect of B on the susceptibility to the surface hot shortness cannot be explained by the effect of B on the oxidation rate. In the previous study, 8) the present authors measured an increase in the specimen weight during heating in air and the LNG combustion gas and revealed that the effects of C and P on the susceptibility cannot be explained by the effects of such elements on oxidation rate. Figure 9 shows the effect of Si on the Cu-enriched phase near the steel/scale interface of 0.1%C-0.5%Mn-0.02%P-0.5%Cu steels heated at 1373 K in air.…”

Section: Effects Of Mn and S On The Susceptibility To The Surface Hotmentioning

confidence: 99%

“…Considering the above background, the present authors have stressed the necessity for the suppression of the surface hot shortness by physical metallurgy, namely, the method {. [4][5][6][7][8][9] The method { aims to suppress the surface hot shortness through controlling of microstructures near the steel/scale interface in order to reduce the amount of the liquid Cu-enriched phase penetrating into grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

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Suppression of Surface Hot Shortness due to Cu in Recycled Steels

et al. 2002

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The most serious problem in the recycling of steel is the occurrence of surface hot shortness during hot deformation due to the mixing of Cu from scrap into steels. Tin accelerates the effect of Cu. The surface hot shortness is caused by liquid embrittlement, that is, formation of the liquid Cu-enriched phase through preferential oxidation of Fe atoms at the steel/scale interface during heating for hot deformation and penetration of this Cu-enriched phase into the grain boundaries. Decrease in the amount of the liquid Cu-enriched phase penetrating into grain boundaries can suppress the surface hot shortness. The amount of the liquid Cu-enriched phase penetrating into the grain boundaries can be reduced by the suppression of oxidation, occlusion of the Cu-enriched phase into the scale, back-diffusion of Cu into the steel matrix and suppression of penetration of the liquid Cu-enriched phase. Therefore, the effects of various elements and conditions of heating and deformation on the surface hot shortness, oxidation, amount of the Cu-enriched phase at the interface and the penetration were examined by tensile tests at high temperatures, thermogravimetry and optical microscopy. The conclusion can be summarized as follows. Silicon, Mn, S (+Mn) and B reduce the susceptibility to the surface hot shortness through decreasing the amount of Cu-enriched phase at the steel/scale interface. The effect of Si is significant. Carbon reduces the oxidation rate in LNG combustion gas. Phosphorus, Si, B and C reduce the susceptibility to the surface hot shortness through restraining the penetration of the Cu-enriched phase into grain boundaries. Heating at higher temperatures reduces the susceptibility mainly through a reduction in the amount of the Cu-enriched phase at the steel/scale interface, although the loss of steels by oxidation increases. A large grain size accelerates the surface hot shortness. A small amount of H 2 O in air significantly accelerates the surface hot shortness. Effects of H 2 O in heating atmosphere depend on the steel composition and more detailed research on this is desired. Very slow deformation does not cause liquid embrittlement through dynamical re-crystallization, while at a fast deformation rate the embrittlement is suppressed by an increase in the critical stress for the liquid embrittlement. Multiple methods using physical metallurgy suggested by the present research for suppressing the surface hot shortness should be applied together with other methods through separation, smelting and design of fabrication in order to promote the recycling of steels.

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Section: Effects Of Atmosphere Of Heating Furnace and Deformation Ratementioning

confidence: 99%

Section: Effects Of Mn and S On The Susceptibility To The Surface Hotmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Suppression of Surface Hot Shortness due to Cu in Recycled Steels

et al. 2002

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“…Como principal efeito negativo, o cobre favorece a ocorrência de perda de ductilidade a quente, o que corre em função do cobre ficar em solução sólida, associado a baixa solubilidade na austenita. Esta combinação de fatores dá origem a zonas enriquecidas em cobre, que fundem em temperaturas de trabalho a quente, causando perda de ductilidade e eventualmente fratura intergranular (UCHINO et al, 2001). O principal mecanismo de endurecimento do cobre em ligas de aço é por solução sólida (Item 1.2).…”

Section: Cobreunclassified

Desenvolvimento De Aço Baixo Carbono Em Aciaria Elétrica Para Produção De Arames Galvanizados

Nicolodi¹,

Ilha²,

Forte³

et al. 2022

ABM Proceedings

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Agradeço primeiramente ao professor Dr. Wagner Viana Bielefeldt pela orientação, confiança e contribuição na minha formação. Agradeço ao professor Dr. Ing. Antônio Vilela pela oportunidade de fazer parte do grupo de pesquisas do Laboratório de Siderurgia da UFRGS. Agradeço ao professor Dr. Eduardo Osório que me orientou durante parte do meu mestrado, sendo também importante na minha formação. Agradeço aos professores Dr. Afonso Reguly, Dr. Rafael Nunes e Dr. Jorge Braz pelas correções e sugestões que enriqueceram as discussões deste trabalho. Agradeço aos colaboradores, técnicos e engenheiros, da usina siderúrgica onde o estudo foi realizado pelas contribuições na realização de ensaios e discussões. Agradeço aos colegas de pós-graduação que integram o grupo de pesquisa do Laboratório de Siderurgia da UFRGS, em especial ao Dr. Bruno Deves Flores e ao MSc. Anderson Azevedo Agra, pela parceria, discussões e contribuições na minha formação. Agradeço a CAPES pela concessão de bolsa de estudo, viabilizando a realização deste trabalho. A todos que participaram de forma direta ou indireta na minha trajetória ao longo dos anos, meu sincero obrigado. "Vivemos em uma sociedade absolutamente dependente do conhecimento, na qual quase ninguém entende o que é ciência e tecnologia, o que é uma receita clara para o desastre."

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“…The alloying effect on Cu bearing steels is studied to minimize the hazardous impact of Cu. Manganese, sulphur, silicon, phosphorus, and nickel effect on Cu in steel are studied from different researches [9][10][11][12][13][14]. The effect of Cu and Sn on the oxidation mechanism of steel is studied by Konda [15,16] with a low amount of Sn and Cu.…”

Section: Introductionmentioning

confidence: 99%

High-temperature oxidation kinetics of Cu bearing carbon steel

Yeşiltepe

Şeşen

2020

SN Appl. Sci.

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In this article, oxidation kinetics of carbon steel is investigated with respect to the existence of copper (Cu). It is aimed to figure out the high-temperature oxidation behaviours of Cu bearing steel. Cu induced hot shortness is the main problem of recycling of tramp element containing steels. The experimental temperature range was decided according to the steel deformation process' . Oxidation experiments were conducted between 900 and 1200 °C with 100 °C intervals in an electrical resistance furnace. High-temperature oxidation kinetics of Cu bearing carbon steel was examined. Topographical surface analysis' of samples were carried out via X-ray diffraction, scanning electron microscopy, optical microscopy. Mass gain rate and kinetical results were algebraically evaluated. Cu segregation on steel surface at elevated temperatures and its behaviour against oxygen were observed.

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Effects of C and P on surface hot shortness of steel due to Cu mixed from steel scrap.

Cited by 5 publications

References 0 publications

Suppression of Surface Hot Shortness due to Cu in Recycled Steels

Suppression of Surface Hot Shortness due to Cu in Recycled Steels

Desenvolvimento De Aço Baixo Carbono Em Aciaria Elétrica Para Produção De Arames Galvanizados

High-temperature oxidation kinetics of Cu bearing carbon steel

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