系统研究了退火温度和时间对不含La和含0.007 8％ La(质量分数,下同)无取向硅钢退火冷轧板微观组织和综合磁性能的影响.结果表明,随着退火温度从850℃升高到1 000℃,退火时间从1 min增加到5 min,两种La含量退火冷轧板的晶粒尺寸逐渐增加;铁损降低,当退火温度为1 000℃,退火时间多于3 min时,又升高;磁感应强度先升高后降低.退火温度和时间相同时,相比不合La的退火冷轧板,含0.007 8％ La退火冷轧板的晶粒尺寸更大,综合磁性能更好.含0.007 8％ La无取向硅钢的最佳退火温度和时间分别为900～950℃和3～5 min,其平均晶粒尺寸为37.7～77.4 μm.%The effect of annealing temperature and time at temperatare on microstructure and integrative magnetic properties of non-oriented silicon steel without lanthanum and with 0.007 8％ (by mass,the same below) lanthanum was studied.The experimental results showed that with the increase in annealing temperature from 850 ℃ to 1 000 ℃ and in time at temperature from 1 min to 5 min,the average grain size of the two annealed cold-rolled steel sheets increased,their core loss decreased,and then increased when the annealing temperature was 1 000 ℃ and annealing time was longer than 3 min,and the magnetic flux density firstly increased and then decreased.Under the same annealing temperature and time,the specimen with 0.007 8％ lanthanum had greater average grain size and better integrative magnetic properties as compared to the specimen without lanthanum.When the annealing temperature was in the range of 900 ℃ to 950 ℃ and annealing time was in the range of 3 min to 5 min,the annealed coldrolled steel sheets with 0.007 8％ lanthanum demonstrated the best integrative magnetic properties,and its average grain size was in the range of 37.7 μm to 77.4 μm.
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