Top Refractory Solution for EBT & Tap-hole System in the EAF

by Dr. Patrick Tassot, Dr. Thomas Schemmel

Publisher - Refratechnik Steel GmbH, Düsseldorf, Germany

Category - Engineering & IT

The market for steel from electric steel plants continues to grow since last decade reaching close to 450 million tons in 2015 (28 % of the crude steel production). Originally devoted to the production simple long products as construction steel bars and rebars at lowest cost, nowadays high quality steel are produced with high requirement to clean steel. At the same time reliability and high availability is challenging due to the tough global international competition. The common factor for all EAF-type when producing high quality steel is to minimized the nitrogen level and slag in the liquid steel during tapping through a tapping spout or EBT and assuming a tight tap stream.Both needs high elaborated refractory MgO-C based bricks or sleeves with a high resistance to hot erosion and for the spout top monolithic solution sometimes precast with a high thermal shock resistance. The paper is detailing some innovative solutions for these critical area as well as hot and cold repair technology possibilities for reaching the best performance and high availability of the furnace. The market for steel from electric steel plants continues to grow since last decade reaching close to 450 million tons in 2015 (28 % of the crude steel production). Originally devoted to the production simple long products as construction steel bars and rebars at lowest cost, nowadays high quality steel are produced with high requirement to clean steel. At the same time reliability and high availability is challenging due to the tough global international competition. The common factor for all EAF-type when producing high quality steel is to minimized the nitrogen level and slag in the liquid steel during tapping through a tapping spout or EBT and assuming a tight tap stream.Both needs high elaborated refractory MgO-C based bricks or sleeves with a high resistance to hot erosion and for the spout top monolithic solution sometimes precast with a high thermal shock resistance. The paper is detailing some innovative solutions for these critical area as well as hot and cold repair technology possibilities for reaching the best performance and high availability of the furnace. The market for steel from electric steel plants continues to grow since last decade reaching close to 450 million tons in 2015 (28 % of the crude steel production). Originally devoted to the production simple long products as construction steel bars and rebars at lowest cost, nowadays high quality steel are produced with high requirement to clean steel. At the same time reliability and high availability is challenging due to the tough global international competition. The common factor for all EAF-type when producing high quality steel is to minimized the nitrogen level and slag in the liquid steel during tapping through a tapping spout or EBT and assuming a tight tap stream.Both needs high elaborated refractory MgO-C based bricks or sleeves with a high resistance to hot erosion and for the spout top monolithic solution sometimes precast with a high thermal shock resistance. The paper is detailing some innovative solutions for these critical area as well as hot and cold repair technology possibilities for reaching the best performance and high availability of the furnace.

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