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The Influence of Placement and Sintering Time of the Steel Ladle Filler-sand
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2018 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The filler-sand is a barrier between the slide gate system and the liquid metal in the steel ladle. During the casting process, the sintered sand should brake due to the ferrostatic pressure from the molten metal to initiate the teaming. This procedure is called a spontaneous opening in the casting context. However, this is not always the case, as the filler-sand that protects the sliding gate, through which the metal passes, often blocks the exit hole.

This study, taking place at Uddeholm in Hagfors, Sweden, investigates the preheating, the refining and the casting process by analyzing the ladle cleaning, sand additions, amount of sand, sintering times and stirring. The aim of the study is to contribute to a better understanding concerning the reasons for complications with the spontaneous opening of the tapping hole. The study finds that the pre-sintering time has a bearing on whether the free opening is successful or not, as the longest and shortest pre-sintering times proved to have a higher rate of non-spontaneous openings. The time from when stirring is stopped to when the sliding gate is opened also correlates well, where longer times lead to more non-spontaneous openings. However, there is no evidence of any correlation between how thoroughly the filler-sand covers the hole and the occurrence of non-spontaneous openings.

Abstract [sv]

Skivtärningssand agerar som en barriär mellan tappningshålet och stålsmältan i en skänk. Vid gjutning av metaller öppnas skivtärningen under skänken och skivtärningssanden som blockerar tappningshålet ska då falla till följd av stålsmältans tryck s.k. spontanöppning. Dock räcker inte alltid det ferrostatiska trycket från smältan för att ta sönder den sintrade sanden.

I undersökningarna som utfördes under 5 dagar i Uddeholm i Hagfors ingick mätning av sintringstid, rengöring av varje skänk, placering och mängden skivtärningssand och omrörningen. Syftet med denna studie är att bidra till en bättre förståelse av orsakerna till icke spontanöppning vid gjutningsprocess. Studien visar att sinteringstiden under förvärmningen har den största påverkan på huruvida spontan öppningens presterande. Den längsta och kortaste sinteringstiden visade sig ha en högre grad av icke-spontana öppningar. Det finns emellertid inga tecken på något samband av hur noggrant fillersanden täcker hålet och förekomsten av icke-spontana öppningar.

Place, publisher, year, edition, pages
2018. , p. 39
Keywords [en]
Filler-sand, Sintering time, Filler-sand placement, Filler-sand coverage, Strirring, Ladle free open
Keywords [sv]
Skivtärningssand, sintringstid, sandplacering, spontan-öppning
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-231504OAI: oai:DiVA.org:kth-231504DiVA, id: diva2:1228892
External cooperation
Uddeholm AB
Subject / course
Materials Science and Engineering
Educational program
Master of Science in Engineering - Materials Design and Engineering
Supervisors
Examiners
Available from: 2018-06-29 Created: 2018-06-28 Last updated: 2018-06-29Bibliographically approved

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