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Optimiranje toplotne obdelave plošč iz jekla SIDUR 500 na proizvodni linij
Slapnik, Luka (Author), Kosec, Borut (Mentor) More about this mentor... This link opens in a new window, Robič, Robert (Co-mentor)

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Abstract
Del strategije podjetja SIJ Acroni d.o.o je bila naložba v novo linijo za toplotno obdelavo debele pločevine (HTL), ki je ena največjih naložb skupine SIJ med leti 2014 in 2020. Tehnologija linije HTL namreč omogoča kakovostno in časovno optimalnejšo proizvodnjo standardnih kvalitet specialne debele pločevine iz rednega programa, kakor tudi izdelavo in razvoj novih, zahtevnejših (tudi v smislu večjih dimenzij) ter butičnih vrst jekel z visoko dodano vrednostjo. Jekla lastne blagovne znamke SIDUR predstavljajo paleto jekel, ki jih odlikuje visoka odpornost proti obrabi. Te vrste jekel se uporabljajo za aplikacije pri prevozu rude, v cementni industriji in kmetijstvu. Jekla SIDUR odlikuje dobra žilavost tudi pri nizkih temperaturah in trdoti v območju od 250 pa do 600 HB. Cilj diplomske naloge je bil ugotoviti optimalno temperaturo avstenitizacije plošč debeline 25 mm in 50 mm iz jekla SIDUR 500. V okviru diplomskega dela je predstavljena optimizacija temperature avstenitizacije za jeklo lastne blagovne znamke SIDUR 500 dveh reprezentativnih debelin, ki izhaja iz proizvodnega programa SIJ Acroni. V prvem delu naloge je predstavljen preizkus kaljivosti obravnavanega jekla po postopku Yominy, ki je bil izveden v skladu s standardom ASTM A 255 -02. Na podlagi pridobljenih parametrov, je bilo nato v drugem delu iz istoimenskega jekla izvedena toplotna obdelava, pod industrijskimi pogoji na liniji za toplotno obdelavo - HTL. Na podlagi dobljenih rezultatov smo izvedli korekcijo temperature avstenitizacije, s tem pa dosegli tudi boljše in bolj enakomerne mehanske lastnosti po preseku jeklene debele pločevine iz jekla SIDUR 500.

Language:Slovenian
Keywords:toplotna obdelava, temperatura avstenitizacije, Jominy preizkus, kaljenje, trdota, mikrostruktura
Work type:Bachelor thesis/paper (mb11)
Organization:NTF - Faculty of Natural Sciences and Engineering
Year:2020
COBISS.SI-ID:15864835 Link is opened in a new window
Views:171
Downloads:62
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Secondary language

Language:English
Title:Heat treatment optimization of steel SIDUR 500 plates on production line
Abstract:
A part of strategy of the company SIJ Acroni was an investment in a new line for heat treatment of heavy plate (HTL), which was one of the biggest investments of the group SIJ from year 2014 to year 2020. The HTL line enables better quality and faster production of standard qualities of special heavy plate by regular schedule, as well as production and development of new and more complex (regarding bigger dimensions) types of steel. Steels of their own brand SIDUR present a diversion of steels that have high resistance towards attrition. These types of steels are used for application for transport of ore, in cement industry, farming. SIDUR steels have high resistance even at low temperatures and strenght in intervals from 250 to 600 HB. The main idea of this diploma work was to figure out optimal temperature of austenitization for 25 mm and 50 mm thick plates made from steel SIDUR 500. This diploma presents the optimisation of the austenisastion temperature for steel of the brand SIDUR 500 of two representative thickness that origin from production programm of SIJ Acroni. The first part presents Yominy test of steel hardenasbility, which was made in accordance with standard ASTM. In the second part we tested heat treatment by industrial conditions of HTL line, based on parameters from the first part. Based on the results we have corrected the temperature of austenitisation, which gave us better overall mechanical parameters on intersection of heavy plate made from steel SIDUR 500.

Keywords:heat treatment, temperature of austenitization, Jominy test, quenching, hardness, microstructure

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