Process Optimization for the Manufacturing of Seamless Steel Tubes in a Continuous Mandrel Mill and a Stretch Reducing Mill

Vargas, Jenny M.; Pagliano, C.; Medina, Francisco; Muratori, Franco; Paganin, F.; Paiuk, J.

doi:10.1016/s1474-6670(17)53102-x

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…and the boundary condition Àë @T @ t Q 1 (2) where C, r, T, t, ë and Q k are the specific heat, density, temperature, time, thermal conductivity and heat generated by plastic work respectively. The rolling condition was the same as in Table 1.…”

Section: Resultsmentioning

confidence: 99%

A study of the mechanism of crack initiation on a mandrel bar for mandrel mill rolling in a seamless tube

Akiyama¹,

Tsubouchi

Tsumura

et al. 2000

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

An investigation was carried out on the mechanism of crack initiation on a mandrel bar used for the mandrel mill operation in seamless tube manufacturing. Close observations of the mandrel bar surface suggested that crack initiation may be induced by a thermal shock. In order to check the validity of this hypothesis, laboratory tests mainly based on cyclic temperature treatment were then carried out in a laboratory and a method was proposed to improve the mandrel bar life. After the estimation of the temperature on the mandrel bar surface both by numerical analysis during rolling and stripping and by an experimental approach during the stripping operation, an acceleration test using a corrugated mandrel bar was carried out on the mandrel mill to verify the validity of the proposed method (to improve the mandrel bar life).

show abstract

Section: Resultsmentioning

confidence: 99%

A study of the mechanism of crack initiation on a mandrel bar for mandrel mill rolling in a seamless tube

Akiyama¹,

Tsubouchi

Tsumura

et al. 2000

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

show abstract

“…The efforts for improving the quality of the tubular products obtained with this process have been extended from the beginning of the process itself, as it can be seen in the research work of Vargas et al [2]. However, the studies involving numerical models are more recent, mainly from the present century.…”

Section: Introductionmentioning

confidence: 99%

Detailed study of tube hot rolling process by means of FEM

GIL

2023

Materials Research Proceedings

View full text Add to dashboard Cite

Abstract. In this paper seamless tubes hot manufacturing calibration rolling is studied by means of a finite element model, to improve product quality and process performance. Based on real data provided by an industrial partner, Tubos Reunidos Group, a finite element model of the process has been created and validated for the thermo-mechanical analysis of the process. The model has been used for the study of the wall thickness evolution and peripherical distribution during process, the eccentricity and the polygonization effects. Results show that the tube velocity in the process is one of the factors affecting wall thickness eccentricity, due to mass flow conservation. Regarding polygonization and eccentricity effect it has been found that both effects increase in the rolling stands with higher reduction ratio, and are corrected afterwards. These effects are mainly due to the ovality of the rolls. However, the effect the different sliding velocity along roll perimeter has implications in the local deformation of the material in contact with the roll, causing local compressive stress areas in addition to the predominant tension areas.

show abstract

“…There are numerous research studies on the rolling load and relevant matters [1][2][3], but very few investigations have been carried out on the influence of contact pressure on the damage to the tools [4]. In previous papers [5,6] the present authors have studied crack initiation on a mandrel bar and been able to show that the major cause of the initiation of microcracks on a mandrel bar is a sharp increase in the surface temperature followed by a sharp cooling.…”

Section: Introductionmentioning

confidence: 99%

A study of the reinforcement technology used to improve the life of mandrel bars used in seamless tube manufacturing by mandrel mill rolling

Akiyama¹,

Tsubouchi

Hori

2000

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

Various heat treatments by induction heating were applied to the material of the mandrel bars used in the manufacturing of seamless tubes by mandrel mill rolling. The influence of experimental conditions was systematically examined, both using small-sized samples and at industrial scale. Within three distinct regions, delimited by a given combination of quenching and tempering temperatures, the toughness of the material could be significantly improved. When applied to mandrel bars in mandrel mill rolling, this actually resulted in longer service lives by preventing crack propagation in the vicinity of the surface. The cost of the new treatment is also lower than that of the conventional furnace heat treatment. NOTATIONT 1 quenching temperature T 2 tempering temperature L03199

show abstract

Process Optimization for the Manufacturing of Seamless Steel Tubes in a Continuous Mandrel Mill and a Stretch Reducing Mill

Cited by 3 publications

References 0 publications

A study of the mechanism of crack initiation on a mandrel bar for mandrel mill rolling in a seamless tube

A study of the mechanism of crack initiation on a mandrel bar for mandrel mill rolling in a seamless tube

Detailed study of tube hot rolling process by means of FEM

A study of the reinforcement technology used to improve the life of mandrel bars used in seamless tube manufacturing by mandrel mill rolling

Contact Info

Product

Resources

About