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(1 ) Abnormal grain growth occurred when Al/N ratio of steel wires decreased to the range from 1 to 6. (2 ) AlN precipitation in wire rod within above range of Al/N ratio was delayed in the course of cooling after the hot rolling, followed with fine AlN precipitations during recrystallization and grain growth at annealing stage after drawing. Such precipitates generated a large restraining force on the grain boundary movement and grain growth was completely depressed. In the case of the isothermal annealing at 800•Ž, however, abnormal grain growth occurred in accordance with decrease in the restraining force as a result of the coalescence of AlN precipitates immediately after the precipitation had been completed. (3 ) The critical conditions investigated for the abnormal grain growth initiating in the restrained grains were in good agreement with HILLERT'S theoretical expectations. (4 ) The restraining force of the fine precipitates on the grain boundary movement can be evaluated as follows :

Effect of Precipitation Behavior of AlN on Abnormal Growth of Ferrite Grains in Low-carbon Steel Wires