Fast and Efficient Annealing of Stainless Steel Strip Using Oxyfuel Burners
2015 (English)In: Steel Research International, ISSN 1611-3683, Vol. 86, no 5, 557-566 p.Article in journal (Refereed) Published
Pilot plant and annealing experiments have been conducted to study the effect of the higher water content in oxyfuel annealing on oxidation and pickling of cold rolled stainless steel. The experiments were conducted on the austenitic grade AISI 304 in a propane-fired furnace using air and pure oxygen as oxidizers. The experiments were conducted at 1050-1200 degrees C for typically less than 60 s, in order to simulate industrial annealing of thin strip. Supplementary laboratory annealing trials were made to study the evolution of the microstructure during fast heating rates and short hold times. Increasing the water content from 15 to 50 mol% did not alter the oxidation kinetics or the chemistry of the oxide. Since the oxidation is not altered significantly, the pickling performance of the material remains unchanged. The presence of spalled areas increased the pickling efficiency significantly but this was only seen for material annealed at higher temperature compared to industrial practice. Oxyfuel combustion allows higher heat input and therefore faster heating. The 304 grade recrystallizes readily even at moderate cold rolling reductions so the total annealing time can be reduced substantially if the heating rate can be increased. The present work suggests that this can be done without any downstream effects.
Place, publisher, year, edition, pages
2015. Vol. 86, no 5, 557-566 p.
oxyfuel, cold rolled stainless steel, annealing, oxide formation, mixed acid pickling
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-159022DOI: 10.1002/srin.201400168ISI: 000354202500012ScopusID: 2-s2.0-84928882243OAI: oai:DiVA.org:kth-159022DiVA: diva2:782227
QC 20150120. Updated from e-pub ahead of print to published.2015-01-202015-01-202015-06-23Bibliographically approved