An Experimental Study of Liquid Steel Sampling

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Ericsson, Ola,1984-KTH,Tillämpad processmetallurgi (författare)

An Experimental Study of Liquid Steel Sampling

BokEngelska2009

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Stockholm :KTH,2009
xi, 37 s.
electronicrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:kth-10518
ISBN:9789174153712
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10518URI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:vet swepub-contenttype
Ämneskategori:lic swepub-publicationtype

Anmärkningar

Sampling of liquid steel to control the steel making process is very important in the steel industry. However, there are numerous types of disposable samplers and no united standard for sampling. The goal in this study is to investigate the effect of slag protection type and sample geometry on sampling parameters and sample homogeneity. Three sample geometries were selected: i) Björneborg ii) Lollipop with a 6 mm thickness and iii) Lollipop with a 12 mm thickness. These sample geometries have been tested with two types of slag protection: metal-cap-protection and argon-protection. The filling velocity and solidification rate of steel samples have been experimentally measured during plant trials. The sample homogeneity with respect to total oxygen content and inclusion size distribution has been determined in different parts of the samples. The study shows that argon-protected samplers have lower, more even, filling velocities (0.19±0.09 m/s) compared to metal-cap-protected samplers (1.28±2.23 m/s). The solidification rate measurements of the different samplers show that the 6 mm thick Lollipop has the highest solidification rate (99~105 °C/s). Measurements of total oxygen content in argon-protected samples showed little variation between different zones of the samples. However, metal-cap-protected samples contained much higher total oxygen contents. Light optical microscope studies showed that the increase in total oxygen content was probably caused by entrapment of top slag during sampling. Furthermore, it was found that the contamination of top slag in the metal samples increased with a decreased sample weight. Determination of inclusion size distribution in argon-protected Lollipop samples showed that a larger number of primary inclusions are found in the top part compared to the middle and the bottom part of the samples.

Ämnesord och genrebeteckningar

TEKNIK OCH TEKNOLOGIER Materialteknik Metallurgi och metalliska material hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Metallurgy and Metallic Materials hsv//eng
liquid steel sampling
slag protection
filling velocity
solidification rate
sample homogeneity
Metallurgical process and manufacturing engineering
Metallurgisk process- och produktionsteknik

Biuppslag (personer, institutioner, konferenser, titlar ...)

Jönsson, Pär,ProfessorKTH,Materialvetenskap (preses)
Karasev, Andrey,Teknologie DoktorKTH,Materialvetenskap (preses)
Hallberg, Malin (opponent)
KTHTillämpad processmetallurgi (creator_code:org_t)

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Av författaren/redakt...: Ericsson, Ola, 1 ...; Jönsson, Pär, Pr ...; Karasev, Andrey, ...; Hallberg, Malin

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Materialteknik; och Metallurgi och m ...

Av lärosätet: Kungliga Tekniska Högskolan

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