关键词: 出钢口管砖, 抗氧化性, 抗热震性, 造粒石墨

Abstract:

The influences of different antioxidants (Al powder,Al powder+Si powder,Al powder+Si powder+CaB₆ powder) and carbon sources (flake graphite,granulated graphite,and expanded graphite) on the properties of taphole pipe bricks for converter prepared using fused magnesia,flake graphite as raw materials were investigated.The results show that:(1)the oxidation resistance and hot modulus of rupture of magnesia-carbon taphole pipe bricks are significantly improved when using Al powder+Si powder+ CaB₆ powder;(2)the introduction of granulated graphite is beneficial for the improvement of thermal shock resistance and oxidation resistance;although the addition of expanded graphite can significantly improve the thermal shock resistance,it reduces their oxidation resistance;(3)the developed taphole pipe bricks were applied in the converters in a steel plant with the average service life of 181 cycles,enhancing by 45%.

Key words: taphole pipe brick, oxidation resistance, thermal shock resistance, granulated graphite