Estimation of inclusion size in stainless steel coil based on statistics of extreme values
2006 (English)In: Sohn International Symposium Advanced Processing of Metals and Materials, Vol 2 - THERMO AND PHYSICOCHEMICAL PRINCIPLES: IRON AND STEEL MAKING, 2006, 421-430 p.Conference paper (Refereed)
It becomes more important to control the composition of inclusions with increasing the demand for quality of products in terms of cleanliness. Along with the development of refining technology to make inclusions harmless, a study was made to develop how to predict the quality of final products. At first, observations of a number of defects revealed that the defects were caused by inclusions larger than 100 mu m in diameter. Therefore it is required to detect relatively large inclusions in steel, whose existence is quite rare, to identify the quality. In order to estimate the maximum size of inclusions in a given sample, the method with statistics of extreme values has been applied for continuously cast (CC) stabs, hot-rolled coils and cold-rolled coils of type 304 stainless steel. For the CC slabs the diameter of inclusions, which were analyzed to be mostly silicate with globular shape, in the specimens was measured. For the coils, the width of inclusions was measured at the unit section perpendicular to rolling direction because it corresponds to the diameter assuming that the width of globular inclusions does not vary with rolled. Then maximum inclusion diameter in a specimen was calculated. As a result, the obtained values in the rolled coils are larger than in the slabs. This may imply that the measurement with the coils gives the values closer to the truth. Besides, the measurement with the coils is even faster than with the slabs due to its simplicity of preparation of the specimens.
Place, publisher, year, edition, pages
2006. 421-430 p.
inclusion, statistics of extreme value, stainless steel, sliver, continuous casting
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-27772ISI: 000241805400037OAI: oai:DiVA.org:kth-27772DiVA: diva2:380903
2006 TMS Fall Extraction and Processing Division: Sohn International Symposium; San Diego, CA; 27 August 2006 through 31 August 2006
QC 201012222010-12-222010-12-222010-12-22Bibliographically approved