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2011 July Issue
Full Table of Contents
Continuous Casting |
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About the Cover
The cover photo shows the largest round bloom caster in North America, located at Nucor Steel Memphis Inc., Memphis, Tenn., USA. The 3-strand, 45-foot-radius caster has the capability to cast round blooms in five sizes. The molds have electromagnetic stirring at two locations on each strand — one in the mold and one just below the spray chamber. This dual-electromagnetic-stirring installation minimizes the segregation in the bloom center and ensures homogeneous bloom chemistry.
Photo courtesy of Danieli & Co. Officine Meccaniche SpA.
Full magazine available in the Members Only Area |
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Technical Features Table of Contents |
| 39 |
Nozzle Design for ArcelorMittal Dofasco’s No. 1 Continuous Caster for Minimizing Sliver Defects
Joydeep Sengupta (left), senior research leader (primary processes) — research and development, ArcelorMittal Dofasco Inc. Hamilton, Ont., Canada (joydeep.sengupta@arcelormittal.com); and Mehmet Metin Yavuz (right), assistant professor, mechanical engineering department, Middle East Technical University, Ankara, Turkey (mehmetmetinyavuz@gmail.com)
This work analyzes a study recently conducted at ArcelorMittal Dofasco to evaluate fluid flow patterns generated in the No. 1 continuous caster mold by using computational fluid flow and heat transfer models. |
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| 48 |
Water Treatment Chemistry Impact on CSP Mill Product Quality and Production Rate
George Gurley, casting supervisor, Severstal Columbus, Columbus, Miss., USA (ggurley@severstalms.com); Joseph S. Strasser, technology and business development manager, and James L. Hatcher, primary metals technical consultant, Nalco Co., Naperville, Ill., USA (jstrasse@nalco.com, jhatcher@nalco.com)
Variances in heat transfer rates during high-speed slab casting results in thermal gradients within the solidifying metal shell and lead to surface irregularities. This paper discusses thermal transport challenges faced as Compact Strip Production mills increase production rates and product quality requirements. |
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59 |
Arvedi ESP (Endless Strip Production) First Thin-Slab Endless Casting and Rolling Results
G. Arvedi, chairman, and F. Mazzolari, senior advisor, Finarvedi, Cremona, Italy (finarvedi@arvedi.it, marketing@arvedi.it); A. Jungbauer, general sales manager, G. Hohenbichler, head of R&DT, and G. Holleis, senior advisor, Siemens VAI, Linz, Austria (andreas.jungbauer@siemens.com, gerald.hohenbichler@siemens.com, guenter.holleis.ext@siemens.com)
This work provides data and results of the Arvedi ESP technology, which allows for uniform and repeatable mechanical properties along the entire strip width and length and the ability to produce ultra-thin hot rolled strip gauges of 0.8 mm (and lower), thus making subsequent cold rolling process no longer necessary for many strip applications. |
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66 |
Steel Degassing Operations Using Mechanical Vacuum Pump Systems
Riccardo Gottardi, managing director — Business Unit Steel Making, and Adam Partyka, senior process metallurgist — Business Unit Steel Making, SMS Concast AG, Zurich, Switzerland (riccardo.gottardi@sms-concast.ch, adam.partyka@sms-concast.ch); Stefano Miani, technical director — Business Unit Steel Making, and Marco Volpe, senior process engineer — Business Unit Steel Making, SMS Concast Italia Srl, Udine, Italy (stefano.miani@sms.concast.it,
marco.volpe@sms.concast.it)
This work presents technical aspects of the pump system design, necessary safety measures, differences between vacuum systems with mechanical pumps and steam ejector pumps, and an extensive analysis of the mechanical vacuum pump system performance and its influence on the efficiency of steel refining operations. |
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75 |
The Effect of Hydrogen on Mold Heat Removal in Continuous Casting
Thomas J. Piccone, senior research engineer, and Samuel M. Smith, senior research consultant, United States Steel Corporation Research and Technology Center, Munhall, Pa., USA (tjpiccone@uss.com, smsmith1@uss.com)
The effect of hydrogen in liquid steel on heat removal in a continuous slab caster mold was investigated for periods of constant casting speed. This work discusses the results of the investigation. |
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84 |
Optimization of Surface Quality Through Mold Thermal Monitoring
Stephen Carless and Arnoud Kamperman, Tata Steel Research Development and Technology, IJmuiden, The Netherlands (stephen.carless@tatasteel.com, arnoud.kamperman@tatasteel.com); Albert Westendorp and Jan Brockhoff, Tata Steel Strip Mainland Europe, BOS 2, IJmuiden, The Netherlands (albert.westendorp@tatasteel.com, jan.brockhoff@tatasteel.com)
As casting speeds increase, the requirements for stable heat transfer and lubrication become increasingly stringent. This work gives an overview of the techniques used and tools developed at Tata Steel IJmuiden to monitor process stability with the purpose of increasing casting speed while minimizing surface cracking. |
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