The 2016 SEAISI Technical Training entitled “Understanding Metallurgy Involved in Continuous Casting and How This Can Improve Product Quality” was successfully conducted on 29th May 2016 at JW Marriott Hanoi, Vietnam. SEAISI received 30 registrations for the training course from 13 companies in this region, mainly from Vietnam. This training was provided by CBMM and supported by Modern Metal Solutions Pte Ltd, DGS Metallurgical Solutions, Inc. and Metal Prime Technology Pte Ltd and it was delivered by three highly experienced lecturers, namely Mr. Michael Wright, Mr. David D. Jarreta and Mr. Douglas Stalheim.
The technical training is conducted in conjunction with the annual SEAISI Conference & Exhibition with the objective of providing more services to SEAISI Conference’s delegates as well as non-delegates to further enhance their technical knowledge in steel industry. Last year, the training was about the theory and operational experiences of rolling of long products. This year, it was mainly about the metallurgy in continuous casting and the effect of semi-finished products quality to the downstream processes.
The contents of the training course were divided into four parts. The first part was introduction about continuous casting process Continuous casting transforms molten metal into solid metal on a continuous basis, solidifying large volumes of metal into simple shapes for subsequent processing. It replaced the antiquated “ingot route” in the 1970-1990’s. In 2014, continuous casting produced more than 95% of the crude steel cast globally while crude steel produced by “ingot route” has been reducing in recent years. Mr. Michael Wright also explained about the history and development of continuous casting, the advantages of continuous casting as well as the current issues with continuous casting. Steelmakers should focus more on metallurgy in continuous casting because it affects the quality of the semi-finished products.
The second part of the training content was a brief introduction about the processes in steelmaking particularly in basic oxygen furnace, electric arc furnace, ladle furnace, vacuum ladle degaser and Ruhrstahl-Hausen ladle degaser. Some recommendations were provided for better steelmaking quality such as raw material selection, non-metallic inclusion flotation, steel refining best practices and synchronization with the caster.
The third part was the main content for the training course where the lecturers talked about the common issues that occur in continuous casting. Basically, the issues can be divided into two, first is the issue of external surface quality and secondly internal quality. There was much interaction between the participants and lecturers on the casting issues. The lecturers provided the causes or reasons for the defects and also some suggestions on how to improve the quality of semi-finished products with their practical experiences and knowledge. The five major external surface quality defects are pinholes/porosity, cracks, oscillation marks, poor scarfing and mechanical wall contamination, scratches, gouges respectively. And the two major internal quality issues are macro/micro alloy centerline segregation and inclusions.
The last part of the training course was about the effects of poor semi-finished product quality on downstream processing. The participants were briefed on the importance of having good billets/slab quality and how it can help their customers to improve the safety issues, productivity, product quality and so on.
SEAISI received positive feedbacks from the participants and most of them indicated that the training had met their objective and expectation. They also rated the training highly in terms of interest, knowledge applicable and knowledge enchancement.