In situ Solidified Hot Tensile Test and Hot Ductility of Some Plain Carbon Steels and Microalloyed Steels.

Revaux, T.; Deprez, Paul; Bricout, J.P.; Oudin, J.

doi:10.2355/isijinternational.34.528

Cited by 31 publications

(30 citation statements)

References 2 publications

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“…Com relação ao %C, a faixa entre 0,10% e 0,15% apresenta maior susceptibilidade à ocorrência de trincas superficiais [20], bem como a região com maiores grãos austeníticos que surgem a partir da reação peritética [21] A Tabela 2 sumariza a análise das 10 variáveis de processos analisadas em relação à propriedade de ductilidade a quente. Verifica-se que 70% das características analisadas atuam de forma a mitigar o risco de perda de ductilidade a quente.…”

Section: Composição Químicaunclassified

Avaliação De Risco Sobre a Perda De Ductilidade a Quente De Barras De Aço Ca-50

Nascimento¹,

Ramos²,

Silva³

et al. 2017

Anais Do Seminário De Laminação E Conformação

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ResumoA capacidade de um determinado aço suportar as deformações ocorridas durante laminação sem fraturas ou trincas severas é denominada de ductilidade a quente, que é função de diversos parâmetros de processo dentre os quais: qualidade do tarugo, tipo de corte, ciclo térmico, temperatura de processo, layout do laminador, calibração, taxa de deformação e composição química. Diversos trabalhos abordam a ductilidade a quente enfatizando a influência isolada de uma variável como critério de qualidade como as conhecidas relações Mn/S e Ni/Cu através da determinação de valores mínimos. A globalização tem sido responsável pela crescente competitividade entre as siderúrgicas que, para se manterem competitivas no mercado, têm que buscar inovações, quebras de paradigmas, estratégias ousadas e assumir riscos. No presente trabalho realizou-se uma avaliação de risco com base no princípio ALARP (As Low As Reasonable Practical) através da análise conjunta das principais variáveis de processo responsáveis pela perda de ductilidade a quente de um aço utilizado para produção de barras de aço CA-50, objetivando-se uma solução otimizada de menor custo garantindo a competitividade e sustentabilidade da cadeia produtiva. Palavras-chave: Ductilidade a quente; Barras de aço CA-50; Avaliação de risco. RISK ASSESSMENT ON THE HOT SHORTNESS OF CA-50 REBARS AbstractThe ability of a particular steel withstand the deformations occurring during hot rolling without fractures or severe cracks is called hot ductility, which is a function of several process parameters among which: billet quality, cut type, thermal cycle, process temperature, roughing mill strand, pass design, strain rate, and chemical composition. Several works address the hot ductility emphasizing the isolated influence of a particular variable as a quality criterion as the known Mn/S and Ni/Cu ratios by determining minimum. Globalization has been responsible for increasing competition among steelmakers that, to remain competitive in the market, have to seek innovations, paradigms breaks, bold strategies and take risks. In this work we carried out a risk assessment based on the ALARP principle (As Low As Reasonable Practical) through the joint analysis of key process variables responsible by hot shortness of steel used for the production of rebars CA-50, aiming to an optimized solution for lower cost, ensuring the competitiveness and sustainability of the business.

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Section: Composição Químicaunclassified

Avaliação De Risco Sobre a Perda De Ductilidade a Quente De Barras De Aço Ca-50

Nascimento¹,

Ramos²,

Silva³

et al. 2017

Anais Do Seminário De Laminação E Conformação

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“…Whereas in as cast steels, it is the total S level that controls the hot ductility. [13] The effect of melting on the hot ductility is evident in Figure 5.6 and Table 5.3.…”

Section: ________________________________ 128mentioning

confidence: 99%

“…Effect of slight bulging of slab or offset roUs on stresses in solidifying skin. [20] At the end of the casting and when the surface temperature is smoothly decreasing, the billet/strand is straightened at a temperature ranging from 700 to 1000°Cy, 13,23,24). At this point, the greatest strains may be imposed to the casting.…”

Section: Stresses and Strains In Continuous Castingmentioning

confidence: 99%

“…[20) The maximum surface stràin on bending of slab was reported to be around 2%. [13) The strain rate is less weU-defined because of the uncertainty about the gauge length necessary to develop the fuU bending strain. For a casting machine constructed to bend a 10" thick bloom with 34 ft radius at a maximum speed of 70 ipm, Lankford [20) reported a bending strain of about 1.2%.…”

Section: Stresses and Strains In Continuous Castingmentioning

confidence: 99%

“…However, a few hot ductility tests associated with melting have aIso been performed. Revaux et al [13] melted and cast steel in a crucible to form a tensile specimen on a tensile machine. Then, the crucible was broken and a tensile test was performed.…”

Section: Evaluation Of Hot Ductility Of Steelmentioning

confidence: 99%

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Effect of High Temperature Deformation on the Hot Ductility of Nb Microalloyed Steel

Zarandi¹,

Yue²

2005

Materials Science Forum

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Hot Shortness

2005

Van Nostrand's Scientific Encyclopedia

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Usage of steel scrap has become important in steel making from the view points of resource conservation and preventing environmental problems. High levels of steel scraps are used in the production of steel, especially, via electric arc furnaces (EAF). However, Copper, which is mainly contained in the scrap of cars and home electronic appliance, is problematic in mechanical workings at elevated temperatures and limits the usage of scrap iron. It is enriched at steel/scale interface by preferential oxidation of Fe, which leads to liquid embrittlement or surface cracking during hot working. This type of defect is well known as surface hot shortness. Cu has been also reported to give surface cracking problem including transverse cracking in continuously cast products and has been found to be detrimental to surface quality. While nickel and silicon have been added to prevent hot shortness and cracking problem, tin, antimony and arsenic are detrimental. Silicon modifies scale of copper-bearing steels and promotes internal oxidation by the formation of 2FeO.SiO2 (fayalite). The evaluation techniques of hot shortness and cracking problem are also equally important and are mainly evaluated by hot tensile and hot bend test after oxidation. In addition to this, hot tensile test has been also used for evaluating hot ductility behavior and surface cracks of continuously cast products.

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In situ Solidified Hot Tensile Test and Hot Ductility of Some Plain Carbon Steels and Microalloyed Steels.

Cited by 31 publications

References 2 publications

Avaliação De Risco Sobre a Perda De Ductilidade a Quente De Barras De Aço Ca-50

Avaliação De Risco Sobre a Perda De Ductilidade a Quente De Barras De Aço Ca-50

Effect of High Temperature Deformation on the Hot Ductility of Nb Microalloyed Steel

Hot Shortness

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