888 KB25 KB200020242014Čarnogurská, MáriaHajkr, ZdeněkPříhoda, MiroslavPyszko, RenéToman, Zdeněkštevilka:3letnik:48str. 389-394COBISSID:1057194ISSN:1580-2949URN:URN:NBN:SI:doc-O91DFIR8enInštitut za kovinske materiale in tehnologijeMateriali in tehnologijeboundary conditionheat transfer coefficientkoeficient prenosa toplotemejni pogojiscalessprayškajatemperature fieldtemperaturno poljevisokotlačno brizganjeThermal effects of a high-pressure spray descaling process| Toplotni učinki postopka odškajanja z visokotlačnim brizganjem|The article deals with the possibilities to remove scale from a slab surface by means of a hydraulic spray using pressurized water as well as with an analysis of the influence of the employed removal method on the thermal field of flat rolled products. The effect of spray descaling on the temperature field of the rolled material was established experimentally in a real mill in semi-operational conditions during the process of secondary spray descaling. The experiment was carried out with two sample slabs. The dimensions of a slab were 400 mm % 400 mm % 30 mm and the chemical composition was 0.20 % C, max. 1.4 % Mn, 0.045 % P, 0.045 % S and 0.009 % N. The temperature data for different depths below the surface of the slab being sprayed, obtained during the experiment, were processed using IHCP1D, a software developed on the basis of the Beck minimization-principle algorithm. The obtained values of the heat transfer coefficient represent the boundary condition for a numerical model of the spraying process. Its mean value established in the experiment was 18460 W/(m2 K)Prispevek obravnava možnost hidravličnega odstranjevanja škaje s površine litih slabov z visokotlačnim brizganjem vode in tudi analizo vpliva načina odstranitve na toplotno polje ploščatih valjancev. Eksperimentalno je bil preizkušen vpliv visokotlačnega odstranjevanja škaje na temperaturno polje valjanega materiala na proizvodni liniji valjarne med sekundarnim odstranjevanjem škaje. Preizkus je bil izveden z dvema vzorcema. Dimenzija valjanca je bila 400 mm % 400 mm % 30 mm, kemijska sestava pa 0,20 % C, maksimalno 1,4 % Mn, 0,045 % P, 0,045 % S, 0,009 % N. Eksperimentalno pridobljene podatke o toploti na posamezni globini pod površino valjanca smo nato obdelali s programsko opremo IHCP1D, ki deluje po algoritmu Beckovega minimalizacijskega principa. Navedeni faktor je hkrati mejni pogoj za numerični model odškajanja. Eksperimentalno določena povprečna vrednost faktorja je 18460 W/(m2 K)TEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije