Institute of Metals and Technology, Ljubljana (IMTLJ)
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Konstrukcijska in mikrolegirana jekla za gradnjo rezervoarjev za naftne derivate = Structural and micro-alloyed steels for the construction tanks for gaso-lineVojvodič-Tuma, Jelena ; Celin, RomanV prispevku bo prikazana uporaba jekel za gradnjo rezervoarjev na Serminu pri Kopru. Uporabljeni sta dve vrsti jekel, niomol 490 K in konstrukcijsko jeklo S355 J2G3. Jeklo niomol 490 K je ... nizkoogljično jeklo pomirjeno z Al in mikrolegirano z Nb in ima mikrostrukturo iz ferita in perlita ter minimalno mejo tečenja 490 MPa s pomembnim deležem na podlagi utrditve z velikostjo zrn. Zarezna žilavost po Charpyju je okrog 250 J in je praktično neodvisna od debeline pločevine. Prehodna temperatura odvisnosti zarezne žilavosti po Charpyju je pod - 60 °C za pločevine debeline do 60 mm. Jeklo je dobro varivo brez predgrevanja za vse debeline pločevine in se odlikuje z veliko odpornostjo proti krhkosti zaradi vodika. Pri API testu v vodi nasičeni z H2S in pod obremenitvijo ohrani kontrakcijo nad 80 % začetne vrednosti, medtem ko se pri jeklu z mejo tečenja 350 MPa kontrakcija zmanjša na 20 %. Občutljivost jekla za krhkost jekla po staranju je bila raziskana v okviru preizkusov za gradnjo 60.000 m3 rezervoarja za skladiščenje naftnih derivatov. Preizkus je bil izvršen na 22 mm pločevini z zarezno žilavostjo po Charpyju 240 J in prehodno temperaturo -125 °C. Po staranju je bila temperatura 50 % žilavosti -90 °C kar kaže, veliko odpornost jekla proti krhkemu lomu v dobavnem stanju. Druga serija preizkusov je bila izvršena z namenom, da se preveri občutljivost jekla na deformacijsko staranje. Ugotovljeno je bilo, da se prehodna temperatura žilavosti poveča zaradi procesov po žarenju hladno deformiranega jekla pri 250 °C. Ugotovljeno je tudi, da samo žarenje ali deformacija ne vplivata pomembno na prehodno temperaturo žilavosti.Source: Program in knjiga povzetkov = Program and book of abstracts (Str. 121)Type of material - conference contributionPublish date - 2007Language - slovenian, englishCOBISS.SI-ID - 655018
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Vojvodič-Tuma, Jelena | 09788 |
Celin, Roman | 17161 |
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