Split Ends and Cracking Problem During Hot Rolling of Continuously Cast Steel Billets

Pandey, J. C.; Raj, Manish; Choubey, P. N.

doi:10.1007/s11668-008-9194-x

Cited by 14 publications

(9 citation statements)

References 16 publications

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“…J. C. Pandey [7] found that there are various reasons for billet cracking in hot rolling process. The various factors were analyzed and other parameter affecting the flow process noted.…”

Section: Scrap Reduction In Tmt Reinforced Barmentioning

confidence: 99%

Scrap Reduction in TMT Reinforced Bar Production by the Application of Lean Techniques

K¹,

Shilpa²,

Appaiah³

2019

IJRTE

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Lean aims to eliminate the non-value-added activity which affects the cost of production along with the scrap rate Lean is often considered as a collection of tools and practices for superior operational and financial performance, through process improvement. Lean is an improvement concept for operational performance in the manufacturing environment. In this work, lean techniques are applied to the manufacturing of random rods at a leading manufacturing company of Thermo Mechanically Treated (TMT) reinforced bars to reduce the scrap. The hot billet coming from the extrusion machine is sent to the rolling mill machine where the TMT bars are produced; this consists of three stages – roughing mill, shear cutting, and programming logical controller. During the shear cut operation performed on the billet, a large amount of scrap was being generated. To reduce this scrap and the non-value-added activities, lean techniques have been applied. Also, the size of the billet was changed to produce maximum yield. With this, the scrap rate at the rolling mill machine has significantly decreased leading to a notable reduction in the cost of production.

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“…J. C. Pandey [7] found that there are various reasons for billet cracking in hot rolling process. The various factors were analyzed and other parameter affecting the flow process noted.…”

Section: Scrap Reduction In Tmt Reinforced Barmentioning

confidence: 99%

Scrap Reduction in TMT Reinforced Bar Production by the Application of Lean Techniques

K¹,

Shilpa²,

Appaiah³

2019

IJRTE

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“…Estas trincas podem acarretar em problemas de abertura de cabeça (Perda de ductilidade a quente) durante o processo de laminação [6][7][8].…”

Section: Qualidade De Solidificação Do Tarugounclassified

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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“…The upside of surface defects, compared to internal ones, is that the chance that they can be visually detected and identified during quality control is high [4]. Depending on the depth of surface irregularities on the surface of heavy plates, they might be rejected, which is considered as a major economic loss for a plant.…”

Section: Introductionmentioning

confidence: 99%

Root Cause Analysis of Surface Cracks in Heavy Steel Plates during the Hot Rolling Process

Bahrami

Khouzani

Mokhtari

et al. 2019

Metals

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This paper investigates the root cause of the formation of surface cracks on hot-rolled C–Mn constructional steel heavy plates. Cracks are rather evenly distributed over the surface in the form of colonies of cracks. Samples were cut from the heavy plate. The microstructure of samples in the as-cast and hot-rolled states were studied using optical and electron microscopes as well as energy dispersive X-ray spectroscopy (EDS). Results show that cracks are heavily oxidized. De-carburized areas are also seen alongside cracks. The crack tip is in the form of a deer-horn, indicating that crack branching has taken place during deformation. The crack initiation sites are V-shaped grooves on the surface of as-cast slabs. Correlations between microstructures, processing parameters, and crack formation are discussed.

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Split Ends and Cracking Problem During Hot Rolling of Continuously Cast Steel Billets

Cited by 14 publications

References 16 publications

Scrap Reduction in TMT Reinforced Bar Production by the Application of Lean Techniques

Scrap Reduction in TMT Reinforced Bar Production by the Application of Lean Techniques

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

Root Cause Analysis of Surface Cracks in Heavy Steel Plates during the Hot Rolling Process

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