Abstract
The annealing of low-carbon steel sheets is usually performed either by a batch-type annealing furnace or by a continuous annealing furnace. In this paper, an experimental study was made on the recrystallization behavior of low-carbon iron sheets, and on the effect of annealing processes, i. e. box-type vs. continuous type, upon mechanical properties of low-carbon iron sheets.
The main results obtained are as follows:
1) When compared with normal low-carbon steel sheets, low-carbon iron sheets has a higher recrystallization or softening temperture, and is relatively slow in recrystallization speed.
2) In the case of continuous-type annealing, more than 100.. higher annealing tempe -rature is needed compared with a batch-type annealing when the same mechanical properties and grain size are expected.
3) Batch-type or box-annealing is satisfactorily performed when the soaking time is more than 2 h, and the optimum soaking temperature is around 850°C.
4) In the case of continuous-type annealing the necessary soaking period is at least more than 3mn, and the preferable soaking temperature is not less than 900.., but when compared with the batch-type annealing method, properties of the product are somewhat inferior.
