Postupci obrade magnezijem za proizvodnju nodularnog lijava

undergraduate thesis

• Title (english): Magnesium treatment methods for the ductile iron production
• Author: Fabijan Kumer
• Mentor: Zoran Glavaš (mentor)
• Committee member: Stjepan Kožuh (predsjednik povjerenstva)
• Committee member: Zoran Glavaš (član povjerenstva)
• Committee member: Martina Lovrenić - Jugović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Metallurgy; Sisak
• Defense date and country: 2017-09-18, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract

Dodatak sferoidizacijskih (nodularizacijskih) elemenata u rastaljeno željezo vjerojatno je najvažniji korak u proizvodnji nodularnog lijeva. Postoji mnogo elemenata koji mogu proizvesti sferični oblik grafita. U komercijalnoj praksi najčešće se upotrebljava magnezij. Dodaje se u rastaljeno željezo kao čisti magnezij ili kao magnezijeva legura. Magnezij i njegove legure imaju niske temperature isparavanja, zbog čega se njihov dodatak u rastaljeno željezo mora provesti s velikom pažnjom.
Ovaj rad daje pregled najvažnijih nodularizacijskih elemenata (magnezij, cerij i elementi rijetkih zemalja te kalcij), najčešće korištenih nodularizatora (čisti magnezij, legure nikal-magnezij te ferosilicij-magnezij legure) i postupaka obrade magnezijem koji su se dokazali kao komercijalno najuspješniji (postupak obrade prelijevanjem nodularizatora u otvorenom loncu, „Sandwich“ postupak obrade u otvorenom loncu, postupak obrade u loncu s poklopcem, postupak obrade u loncu uz propuhivanje inertnim plinom kroz porozni čep, postupak obrade uranjanjem nodularizatora, postupak obrade punjenom žicom, postupak obrade u konvertoru, postupak obrade u kalupu i postupak obrade protjecanjem).

Abstract (english)

The addition of spheroidizing (nodularizing) elements to molten iron is probably the most important step in the production of ductile iron. There are a lot of elements that are capable to produce spheroidal form of graphite. In commercial practice, magnesium is most
commonly used. It is added to molten iron as pure magnesium or magnesium alloy. Magnesium and its alloys have low vaporization temperatures and, consequently, their addition to molten iron must be done with extreme care.
This paper gives a review of the most important nodularizing elements (magnesium, cerium and other rare earth elements and calcium), the most commonly used nodularizers (pure magnesium, nickel-magnesium alloys and magnesium-ferrosilicon alloys) and magnesium treatment methods that have proven to be the most commercially successful (open ladle pour-over process, sandwich open ladle treatment, tundish cover treatment, porous plug process, plunging method, cored wire treatment, converter method, in-mould treatment and flow-through process).

• Keywords: nodularni lijev; nodularizacijski elementi; nodularizatori; postupci obrade magnezijem
• Keywords (english): ductile iron; nodularizing elements; nodularizers; magnesium treatment methods
• Language: croatian
• URN:NBN: urn:nbn:hr:115:824149
• Study programme: Title: Metallurgy; specializations in: Metallurgical Engineering, Industrial Ecology; Course: Metallurgical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-10-20 08:35:03