In order to solve the problem of submerged entry nozzle slag line part is serious erosion, and prevent the alumina adhesion caused by nozzle clogging, a series of novel submerged nozzle was developed based on aluminum carbon.
1. Al2O3-C/ZrO2-C composite nozzle
With the development of continuous casting technology, steel increased, pulling speed increase, requirements to further improve the slag line part corrosion resistance, in the slag line with zirconium carbon refractory materials as composite layer. Because ZrO2 has excellent chemical stability to be CaO-Al2O3-SiO2 slag erosion, high temperature melt into the residue of ZrO2 increases the viscosity of slag, but not by ZrO2 particle melting and increase the apparent viscosity of the slag, thereby reducing the erosion of slag on ZrO2-C layer, to improve the durability of the nozzle. The higher content of ZrO2 anti erosion ability.
2. (MgO-C) – (Al2O3-C) – (ZrO2-C) composite nozzle
In order to improve the durability of the submerged entry nozzle, the molten steel flow part adopts MgO-C to control quality, prolong the service life and improve casting speed, the slag line part uses ZrO2 or BN to improve corrosion resistance. Body parts using Al2O3-C.
3. ZrB2-C protective sleeve
Sen slag line part of the protective sleeve, requirements of material has good resistance to spalling resistance. Poor high temperature stability of ZrC, ZrN, and Zr boride. Adopt ZrB-C material, add appropriate amount of metal Al to improve the corrosion resistance, the critical size reduction of ZrB2, prevent spalling resistance drop.
4. The submerged entry nozzle add AZT, AZTS material
Using Al2O3-ZrO2-TiO2 sintering and electric melting method (AZT) and Al2O3-ZrO2-TiO2-SiO2 (AZTS) materials, has low expansion coefficient, corrosion resistance, good stability characteristics under reducing atmosphere. Using two kinds of raw materials of AZT and AZTS, fused silica amount according to certain proportion of particles (FS), using resin as binder, submerged entry nozzle, the isostatic pressing of excellent performance, 
high mechanical strength, corrosion resistance and good thermal shock resistance characteristics, to meet the needs of multiple ladle continuous casting. Accession to the AZT and AZTS products, the nozzle has good thermal shock resistance, with the accession to the AZTS of the submerged entry nozzle thermal shock resistance optimal.
high mechanical strength, corrosion resistance and good thermal shock resistance characteristics, to meet the needs of multiple ladle continuous casting. Accession to the AZT and AZTS products, the nozzle has good thermal shock resistance, with the accession to the AZTS of the submerged entry nozzle thermal shock resistance optimal.
5. Long time multi furnace continuous casting of the submerged entry nozzle
Green resistance difficult clogging and oxidation resistant coating produced in solving the nozzle cavity, developed the insulation type argon blowing immersion nozzle, because of the reduced temperature, prevent the crack due to the stress, different degree of reduced cavity with slag.
6. Thin-walled aluminum carbon submerged nozzle
The submerged entry nozzle wall consists of an upper and lower section of zirconium aluminum carbon composite, thin-walled nozzle made of wall thickness of only 12.5mm. Its good thermal shock resistance, strong corrosion resistance, in use are not falling, no crack, erosion is slight, can increase the number of continuous cast, reduce material consumption, improve the quality of casting billet.
没有评论:
发表评论