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2012 November Issue
Full Table of Contents
Hot Flat Product Rolling, Rolls, and Safety & Health |
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About the Cover
The new rolling mill of Çolakoğlu Metalurji is designed for an annual capacity of 3 million tons of hot strip. The maximum strip width is 1,650 mm, and the strip gauges between 1.2 and 25.4 mm. The product mix includes a wide range of carbon steels, including HSLA grades, tube and pipe grades, dual-phase and TRIP grades. The 4-high reversing roughing mill has hydraulic roll-gap adjustment systems with a maximum roll force of 45 MN, heavy hydraulic sideguides and "camber-free" rolling. The attached edger delivers a maximum of 6,700 kN of edging force. The plant is located in Gebze, Turkey.
Photo courtesy of SMS Siemag.
Full magazine available in the Members Only Area. |
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Technical Features Table of Contents |
| 47 |
Effect of Non-Uniform Roll Cooling
on Hot Bands Crown and
Flatness in Finishing Stands
E. Nikitenko,
research consultant, Research and Technology Center, United States Steel Corporation,
Munhall, Pa., USA,
enikitenko@uss.com
The design of work roll cooling headers varies from the early to the later finishing stands, as well as from one hot strip mill to another. It is a common practice to apply variable flow of cooling water across the work rolls. However, the impact of such non-uniform cooling on flatness and crown in each of the finishing stands had not been thoroughly analyzed. The effect of cooling pattern is evaluated here through simulations and confirmed by the experimental data.
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| 52 |
Development of TMCP Steel Plates
for Hydraulic Supports Used
in Mining Machinery
Xianying Xue, Haijun Chen, Hong Lei and Weizhao Song, Baosteel Group Xinjiang Bayi Iron & Steel Co. Ltd., Toutunhe District, Urumqi, P.R. China,
xuexy@bygt.com.cn
Steel plates with a good combination of strength, toughness and weldability have been required for hydraulic supports, with a different configuration used in mining machinery. TMCP steel plates were developed using newly installed accelerated cooling equipment on the premise that gas contents, non-metallic inclusions and segregation of the continuous casting slabs were strictly controlled, for which the stable industrialized production stage has come true. |
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57 |
Automatic Roll Loaders for
Intelligent Roll Shops
Giovanni Bavestrelli,
software engineering director, Pomini Tenova SpA, Castellanza, VA, Italy, giovanni.bavestrelli@it.tenovagroup.com
Automatic roll loading systems have been used for many years in modern roll shops. Today, automatic loaders are driven by a CNC and have a software interface that receives electronic requests for rolls from the mills, recognize roll IDs through RFID tags, rotate chocks, schedule roll movements in the roll shop, and prepare rolls for the mill without operator intervention. This paper presents one of the latest such automatic loader projects.
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66 |
Elimination of Full Face and Edge Cracking in Hot Charge Plate Rolling
Victor Hernandez,
process specialist, iron and steel, HATCH, Mississauga, Ont., Canada,
vhernandez@hatch.ca,
Sunil Kumar
director, iron and steel, HATCH, Mississauga, Ont., Canada,
skumar@hatch.ca
Hot direct charging of continuously cast slabs into a reheat furnace for hot rolling into plates presents unique quality challenges, particularly due to the formation of full face and edge cracks. This paper describes how innovative operational practices and automation improvements resulted in significant reduction of full face and edge cracking problems. |
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77 |
Development of New Materials Based on On-Site and Laboratory Evaluation Methods for Understanding Work Roll Surface Degradation
Gisèle Walmag, program leader (gisele.walmag@crmgroup.be), and Sébastien Flament, project leader, CRM Group (sebastien.flament@crmgroup.be), Liège, Belgium; Jurgen Malbrancke, senior project leader, CRM Group (jurgen.malbrancke@crmgroup.be), Zwijnaarde, Belgium; and Geneviève Moreas, program leader (genevieve.moreas@crmgroup.be), CRM Group, Liège, Belgium; and Mario Sinnaeve, Marichal Ketin, Liège, Belgium (quality.control@mkb.be)
The Centre for Research in Metallurgy is now equipped with a series of laboratory and on-site methods for evaluating the surface degradation behavior of work roll material. These methods include classical mechanical testing and specially developed evaluation tests and procedures. This paper describes some examples of the application of these methods and the role they have played in a better understanding of the work roll surface degradation mechanisms and in the development of new materials.
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175 |
On a New Slip-Stick Rolling Model With Non-Circular Roll Bite Containing Multiple Characteristic Zones Remn-Min Guo
vice president of research and development, Tenova I2S, Yalesville, Conn.,
RGuo@i2s.com
A new rolling model was developed directly from a von Karman equation using von Mises and Tresca yield criteria, and a new friction hill was revealed. The roll bite is composed of nine characteristic nodes in elastic deform, plastic deform and elastic recovery zones. This paper will describe this new theory and its associated solving routine. Comparison with other traditional and modern rolling models will also be presented.
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