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Syntetiska Slaggbildare för Rostfritt Stål
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2017 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Currently, at Sandvik Materials Technology, slag from the AOD is primarily utilized in ladle treatment of steel. This project has evaluated three synthetic slag formers for ladle treatment. The evaluation has been conducted by measuring how the total oxygen contents and amount of non-metallic inclusions change when using the three syntethic slag formers. The result from these measurements has then been compared to how the total oxygen content and amount of non-metallic inclusions change when using the slag from the AOD. The amount of slag in the ladle has, furthermore, been measured in two ways. By the use of mass balance, and by physically measuring the slag height in the ladle. The results from these two methods of measuring the slag amount has been compared. Lastly, a correlation between the total oxygen content and detected amount of non-metallic inclusions has been evaluated. The results show that the three synthetic slag formers provides a cleaner steel with regards to total oxygen content and amount of non-metallic inclusions in comparison to the slag from the AOD. There is a good conformance between measuring the amount of slag by mass balance compared to physically measure it. Lastly, it can be determined that there is no correlation between the total oxygen contents and the detected amount of non-metallic inclusions in the steel.

Abstract [sv]

Vid Sandvik Materials Technology i Sandviken används i nuläget huvudsakligen AOD-slagg vid skänkugnsbehandling. Detta projekt har utvärderat tre syntetiska slaggbildare för skänkugnen. Utvärderingen har gjorts genom att mäta hur väl de tre syntetiska slaggbildarna renar stålet med avseende på den totala syrehalten och mängden icke-metalliska inneslutningar under skänkugnsbehandling. Resultatet från de tre syntetiska slaggbildarna har därefter jämförts med hur väl AOD-slaggen renar stålet. Vidare har slagghöjden i skänken mätts på två sätt. Både genom massbalans med hjälp av slaggsammansättning och genom att fysiskt mäta slagghöjden. Resultatet från dessa två metoder har jämförts. Dessutom har en korrelation mellan den totala syrehalten och den detekterade mängden icke-metalliska inneslutningar undersökts. Resultaten visar att de tre syntetiska slaggbildarna renar stålet bättre jämfört med AOD-slaggen. Det finns en bra överrensstämmelse mellan att mäta slagghöjden med hjälp av massbalans jämfört med att mäta slagghöjden fysiskt. Slutligen kan det konstateras att det ej finns en korrelation mellan den totala syrehalten och den detekterade mängden icke-metalliska inneslutningar. 

Place, publisher, year, edition, pages
2017. , 70 p.
Keyword [sv]
slagg processmetallurgi sandvik skänkugn
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-210894OAI: oai:DiVA.org:kth-210894DiVA: diva2:1120840
External cooperation
Sandvik AB Materials Technology
Subject / course
Materials Science and Engineering
Educational program
Master of Science in Engineering - Materials Design and Engineering
Supervisors
Examiners
Available from: 2017-07-07 Created: 2017-07-07 Last updated: 2017-07-07Bibliographically approved

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