HEAT LOSSES OF BLOOM IN THE HOT ROLLING PROCESS

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F22%3APU146661" target="_blank" >RIV/00216305:26210/22:PU146661 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.confer.cz/metal/2022/4396-heat-losses-of-bloom-in-hot-rolling-process" target="_blank" >https://www.confer.cz/metal/2022/4396-heat-losses-of-bloom-in-hot-rolling-process</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.37904/metal.2022.4396" target="_blank" >10.37904/metal.2022.4396</a>

Jazyk výsledku

angličtina

Název v původním jazyce

HEAT LOSSES OF BLOOM IN THE HOT ROLLING PROCESS

Popis výsledku v původním jazyce

The temperature of the bloom during hot rolling is a crucial factor for the quality of the final product. Heat losses during hot rolling which affect bloom temperatures were therefore experimentally investigated. Experiments were designed to simulate heat transfer on the bloom surface during rolling when: 1. the bloom does not move and is far from the work roll (heat transfer by radiation and free convection in air); 2. the bloom moves far from the work roll (heat transfer by radiation and forced convection in air); 3. the bloom moves close to the work roll so the residual water from roll cooling falls on its surface (heat transfer by radiation and forced convection by residual spray from work roll cooling). Roll bite is excluded in this paper. Experiments were performed with an austenitic steel plate embedded with thermocouples. The plate was firstly heated up to 900 °C and then repeatedly moved by a computer controlled mechanism through a section which simulated the blooming line. Three different velocities of 1, 3, and 5 m·s-1 were tested to observe the influence of velocity on the heat losses. The temperatures gathered during the experiments are evaluated numerically by an inverse heat conduction task and analytically. The final results show that the highest heat loss is caused by radiation; its value is 171 W·m-2·K-1for 1,100 °C. The heat loss due to residual water from work roll cooling is 80-88 W·m-2·K-1 and the heat loss by forced air is found to be from13-29 W·m-2·K-1 .

Název v anglickém jazyce

HEAT LOSSES OF BLOOM IN THE HOT ROLLING PROCESS

Popis výsledku anglicky

The temperature of the bloom during hot rolling is a crucial factor for the quality of the final product. Heat losses during hot rolling which affect bloom temperatures were therefore experimentally investigated. Experiments were designed to simulate heat transfer on the bloom surface during rolling when: 1. the bloom does not move and is far from the work roll (heat transfer by radiation and free convection in air); 2. the bloom moves far from the work roll (heat transfer by radiation and forced convection in air); 3. the bloom moves close to the work roll so the residual water from roll cooling falls on its surface (heat transfer by radiation and forced convection by residual spray from work roll cooling). Roll bite is excluded in this paper. Experiments were performed with an austenitic steel plate embedded with thermocouples. The plate was firstly heated up to 900 °C and then repeatedly moved by a computer controlled mechanism through a section which simulated the blooming line. Three different velocities of 1, 3, and 5 m·s-1 were tested to observe the influence of velocity on the heat losses. The temperatures gathered during the experiments are evaluated numerically by an inverse heat conduction task and analytically. The final results show that the highest heat loss is caused by radiation; its value is 171 W·m-2·K-1for 1,100 °C. The heat loss due to residual water from work roll cooling is 80-88 W·m-2·K-1 and the heat loss by forced air is found to be from13-29 W·m-2·K-1 .

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název statě ve sborníku

Sborník z konference Metal 2022

ISBN

978-80-88365-06-8

ISSN

—

e-ISSN

—

Počet stran výsledku

5

Strana od-do

182-186

Název nakladatele

Neuveden

Místo vydání

neuveden

Místo konání akce

Orea Congress Hotel Brno

Datum konání akce

18. 5. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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