Effects of Decreasing the Initial Rolling Temperature in Three-High Roughing Stands

Смирнов, Е. Н.; Смирнов, А. Н.; Sklyar, V. A.; Belevitin, V. A.; Eron’ko, S. P.; Pivovarov, R. E.

doi:10.3103/s0967091218060104

Cited by 11 publications

(6 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…В качестве технологического объекта исследования был выбран среднесортный стан 500/370 [10]. На текущий момент реализовано перепрофилирование стана на использование НЛЗ из углеродистых, качественных конструкционных и рессорно-пружинных марок стали.…”

Section: объект и условия моделированияunclassified

“…В большинстве случаев, на современных мини-металлургических заводах кратную длину заготовки для последующей прокатки получают в технологической линии МНЛЗ. Тем не менее, строительство в последние годы ряда прокатных станов, оснащенных клетями «трио» [10], а также использование непрерывнолитой заготовки на действующих станах линейного типа [11] обусловило тот факт, что получение заготовок кратной длины из штанг (чаще всего 12-ти метровой длины), поставленных с МНЛЗ, производится в условиях прокатного цеха. Наиболее часто для этих целей применяют ломку металла в холодном состоянии или огневую порезку.…”

Section: Introductionunclassified

See 1 more Smart Citation

Influence of thermal state of the end area of multiple continuous-cast billet on cracking of the ends of hot-rolled breakdown at rolling

Смирнов¹,

Sklyar²,

Смирнов

et al. 2019

Izv. vysš. učebn. zaved., Čern. metall.

Self Cite

View full text Add to dashboard Cite

The authors have made an analysis of problems arising in the rolling of continuous-cast billets in the modern mini-metallurgical and rerolling plants. It is shown that the use of trio stands in rolling mills of these plants makes it necessary to obtain billets of multiple lengths from bars (most often of 12-meter length) produced in the rolling shop. The subsequent rolling of such multiple billets has revealed increased cracking of the front edge and, as a result, increased metal consumption. Analysis of the causes of these cracks has been made. It was indicated that this defect can appear as a result of a certain stress-strain state formed at the end of hot-rolled breakdown. It is caused by the presence of an uneven temperature field due to more intensive end cooling, to reduction mode in the trio stand and to the presence of axial defects in the continuous-cast billet. The study was conducted on the industrial medium-grade mill 500/370, as well as using mathematical modeling by finite element method. The influence of a set of technological factors, such as temperature of the billets heating before rolling, the time interval of their transportation on the site “heating furnace – first stand of the rolling mill” and parameters of the macrostructure of axial area of the metal were investigated. Calculations by the developed mathematical model have indicated the need to take into account the presence of a scale layer on the heated continuous-cast billet. It is shown that depending on the heating temperature and transport time, the temperature difference at the billet’s end compared to the heating temperature can be from 45 to 100 °C. It will lead to an uneven distribution of deformation resistance and unfavorable stress-strain state at the billet’s end. In addition, the presence of an axial defect can affect the cracking because of its shape and its transformation during reduction. Obtained experimental data allowed hypothesizing the mechanism of transformation of discontinuity defects into cracks at the billet’s end due to the conditions of continuous casting and cutting of billets during rolling in the reduction stand.

show abstract

Section: объект и условия моделированияunclassified

Section: Introductionunclassified

Influence of thermal state of the end area of multiple continuous-cast billet on cracking of the ends of hot-rolled breakdown at rolling

Смирнов¹,

Sklyar²,

Смирнов

et al. 2019

Izv. vysš. učebn. zaved., Čern. metall.

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

“…In works [25][26][27][28][29][30] the researches of separate processes which also using on design of a rolling at Steckel mill are presented. At indicated, temperature and strain rate conditions play a significant role in obtaining a high-quality steel structure, mechanical properties and other quality indices [25][26][27][28][29][30]. So in paper [31], the temperature drop in closed coilers is taken into account, and the theoretical consideration of the indentation of a roller tool into a slab allows one to evaluate deformation and power modes [29,[32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Developing of X65 steel coils making at Steckel mill using thermo-mechanical control process

et al. 2021

View full text Add to dashboard Cite

The process of thermo-mechanically controlled rolling in the conditions of Steckel mill of Ferriera Valsider plant was developed for the first time for hot-rolled coils in the sizes of 12 mm × 1510 mm from steel of X65 grade for further production of electric welded pipes according to the API-5L standard. The developed process provides carrying out of the roughing-rolling in two stages to facilitating the forming of a smaller austenite grain and therefore more dispersed and homogeneous inherited ferrite structure in the finished rolled product. At the implementation of the process, the holddown of the temperature at the desired level at 1780 Steckel rolling mill has been carried out by adjusting the number of burners in furnace coilers. The process of controlled air cooling of rolled coils to a temperature of 400°C after winding in the developed technology for Steckel’s mill condition of Ferriera Valsider plant is applied for the first time that allowed to reduce the thickness of the air scale layer and to improve the surface quality. The performed research has been allowed to evaluate the feasibility of the operating equipment and to determine the possibility of coils fabrication related to the nowadays world requirements and satisfied to the demand of European electricwelded pipes manufacturers.

show abstract

“…We researched the influence of gas-impulsive treatment [1][2][3][4][5][6][7][8][9][10][11] without preliminary heating on the residual stresses in thin-walled ring piped structural elements of aircraft engines, aircraft and airdrome equipment.…”

mentioning

confidence: 99%

Removal of residual stresses in aircraft structural elements by pulsating subsonic gas flows treatment

Kovalenko

Ivanov

2020

MATEC Web Conf.

View full text Add to dashboard Cite

show abstract

Effects of Decreasing the Initial Rolling Temperature in Three-High Roughing Stands

Cited by 11 publications

References 4 publications

Influence of thermal state of the end area of multiple continuous-cast billet on cracking of the ends of hot-rolled breakdown at rolling

Influence of thermal state of the end area of multiple continuous-cast billet on cracking of the ends of hot-rolled breakdown at rolling

Developing of X65 steel coils making at Steckel mill using thermo-mechanical control process

Removal of residual stresses in aircraft structural elements by pulsating subsonic gas flows treatment

Contact Info

Product

Resources

About