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An Experimental Study of Liquid Steel Sampling
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

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.

 

Place, publisher, year, edition, pages
Stockholm: KTH , 2009. , xi, 37 p.
Keyword [en]
liquid steel sampling, slag protection, filling velocity, solidification rate, sample homogeneity
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-10518ISBN: 978-91-7415-371-2 (print)OAI: oai:DiVA.org:kth-10518DiVA: diva2:218709
Presentation
2009-06-15, K408, KTH, Brinellvägen 23, STOCKHOLM, 10:00 (English)
Opponent
Supervisors
Available from: 2009-06-08 Created: 2009-05-20 Last updated: 2012-03-20Bibliographically approved
List of papers
1. An Experimental Study of Sampling Parameters for Liquid Steel
Open this publication in new window or tab >>An Experimental Study of Sampling Parameters for Liquid Steel
(English)Article in journal (Other academic) Submitted
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-25133 (URN)
Note
QS 20120326Available from: 2010-10-11 Created: 2010-10-11 Last updated: 2012-03-26Bibliographically approved
2. Homogeneity of Steel Samples
Open this publication in new window or tab >>Homogeneity of Steel Samples
(English)Article in journal (Other academic) Submitted
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-25137 (URN)
Note
QS 20120326Available from: 2010-10-11 Created: 2010-10-11 Last updated: 2012-03-26Bibliographically approved

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