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轧辊系特大断面铸件,铸后冷却速度缓慢,不易得到球状石墨。但是,严格控制铁水的化学成分,合适的碳当量(K=3.4～3.8),采用纯镁做球化剂,合适的镁处理温度,缩短处理后到浇注的时间,可以防止球化衰退,获得球化良好的特大断面轧辊。对石墨形态的观察和统计表明,石墨的球化率高且分布均匀时,可以提高轧辊的强度。例如,型钢轧辊平均球化率在89%时,其抗拉强度大于350MPa。
Roll Department of large cross-section casting, casting slow cooling, difficult to get spherical graphite. However, strict control of the chemical composition of molten iron, the appropriate carbon equivalent (K = 3.4 ~ 3.8), the use of pure magnesium as a ball agent, a suitable magnesium treatment temperature, shorten the processing time to pouring, Ball of good large cross-section roll. Observations and statistics on the morphology of graphite indicate that when the nodularity of graphite is high and the distribution is uniform, the strength of the roll can be improved. For example, when the average nodularity of profiled steel rolls is 89%, its tensile strength is more than 350MPa.