Effect of Slag Protection System and Sample Geometry on Homogeneity of Total Oxygen Content in Samples from Liquid Steel
2011 (English)In: Steel Research International, ISSN 1611-3683, Vol. 82, no 3, 222-229 p.Article in journal (Refereed) Published
Many kinds of disposable samplers are available for sampling of liquid steel during steelmaking. Depending on slag protection, they can be divided into two main groups: metal-cap-protected and argon-protected samplers. For high quality steels, a correct determination of inclusion characteristics in metal samples is important for an improved process control. This paper seeks to investigate the effect of slag protection system, and sample geometry, on deviation and total content of oxygen within samples from the ladle treatment of liquid duplex stainless steel. The homogeneity with respect to total oxygen content was determined for different zones in the body, pin and inlet part of Bjorneborg and Lollipop (6 and 12mm thickness) samples. The results showed low, and stable, contents of oxygen in the argon-protected samples. However, the total oxygen content, and deviation of oxygen, in metal-cap-protected samples was much higher, especially in the body part of the samples. Finally, it was found that the oxygen content heterogeneity in the metal-cap-protected samples increased with a decreased sample weight. Based on the obtained results, the 6mm thick Lollipop sample with argon-protection is recommended for determination of total oxygen content and oxide inclusion characteristics.
Place, publisher, year, edition, pages
2011. Vol. 82, no 3, 222-229 p.
sampling, steel, reoxidation, homogeneity, slag protection, oxygen content
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-26095DOI: 10.1002/srin.201000136ISI: 000289061100009ScopusID: 2-s2.0-79952219898OAI: oai:DiVA.org:kth-26095DiVA: diva2:369918
QC 20101112 Uppdaterad från accepted till published (20110420).2010-11-122010-11-122011-04-20Bibliographically approved