Innovative descaling strategies and their influence on heat losses

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F26%3A0199355" target="_blank" >RIV/00216305:26210/26:0199355 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.33313/450/020" target="_blank" >http://dx.doi.org/10.33313/450/020</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.33313/450/020" target="_blank" >10.33313/450/020</a>

Result language

angličtina

Original language name

Innovative descaling strategies and their influence on heat losses

Original language description

Hot rolling of long products is composed of several steps: reheating, descaling, roughing, intermediate and finishing rolling, heat treatment, etc. Mills strives to increase the efficiency of these processes as much as possible. Product quality is the top priority, and it is directly connected to descaling quality. High-pressure descaling is typically composed of high-pressure nozzles mounted on a fixed spray bar. Key parameters are water pressure, nozzle configuration, size of nozzles, positioning of nozzles, orientation and overlapping and the arrangement of the descaler header related to descaling performance. These parameters have already been studied and optimized concerning descale ability in [1] - [3]. Innovative trends described in this paper focus on different descaling strategies and systems related to descaling quality and heat loss. Typically, a single row of descaling nozzles is used in a hot rolling process. The first innovative approach was to install a low pressure (20 bar) row of nozzles before the descaling system. The hypothesis was that undercooling of the scale surface could cause microcracks in the oxide layer due to the different thermal expansions of a scale and steel. The next innovative approach was based on placing two descaling rows in opposite directions to improve the descaling process and minimize heat loss caused by reflected water flowing on a workpiece surface. Finally, another two descaling systems were studied. The first one was hydromechanical rotary descaling and shot blasting systems. The above-mentioned strategies and systems were compared with a focus on heat transfer and descaling efficiency, which is a key factor. Heat transfer tests were performed by Heat Transfer and Fluid Flow Laboratory (HeatLab). The descaling trials were done by Centre de Recherches Metallurgiques (CRM) and numerical simulations by VDEh-Betriebsforschungsinstitut (BFI). Hauhinco Maschinenfabrik produced a descaler and mounted it at a blooming line.  

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20303 - Thermodynamics

Project

<a href="/en/project/LUAUS24006" target="_blank" >LUAUS24006: Multi-phase Heat Transfer from Porous Structure of Oxides Formed on Metals at High Temperatures</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Sborník z konference

ISBN

9780930767402

ISSN

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e-ISSN

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Number of pages

11

Pages from-to

155-166

Publisher name

Association for Iron and Steel Technology

Place of publication

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Event location

USA, Texas, Dallas

Event date

Sep 16, 2025

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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