二次冷轧的中间退火温度对2.3Si无取向硅钢组织和性能的影响

Effect of Intermediate Annealing Temperature between Double Cold Reduction on Structure and Performance of 2.3Si Non-Oriented Silicon Steel

试验2.3Si无取向硅钢（/％：0.003C,2.30Si,0.16Mn,≤0.020P,≤0.005S,0.54A1）冷轧板由常化和未常化的2.5mm热轧板冷轧至0.6 mm（压下率76％）,经750～950℃2.5 min中间退火后再冷轧至0.5 mm（压下率16.7％）,成品板经890℃＋960℃2.5min退火.研究了中间退火温度对该钢晶粒尺寸、织构和磁性能的影响.结果表明,随中间退火温度的升高,二次冷轧前晶粒和成品晶粒增大,成品中不利织构组分{111}和{112}减弱,磁性能得到改善.热轧板经过常化时的磁性能明显好于未经常化时的磁性能,但中间退火温度较高时常化对磁性能的有利作用减弱.

The test cold sheet of 2. 3Si non-oriented silicon steel （/% ： 0. 003C, 2. 30Si, 0. 16Mn, ≤0. 020P, ≤ 0. 005S, 0. 54A1） is first cold-rolled from normalized and un-normalizing 2.5 mm hot-rolled plate to 0. 6 mm sheet （ reduc- tion 76% ） , then intermediate annealed at 750- 950 ℃ for 2. 5 rain and double cold-rolled to 0. 5 mm sheet （ reduction 16. 7% ）, the finished sheet annealed at 890 ℃ ＋960 ℃ for 2. 5 rain. Effect of the intermediate annealing temperature on grain size, texture and magnetic performance of the steel has been studied. Results show that with increasing intermediate annealing temperature the grain size before double cold-rolling and finished product increases, the adverse { 111 I and { 112t texture components in finished products decrease and the magnetic performance improves. The magnetic performance of sheet cold-rolled by normalized hot-rolled plate is obviously better than that by un-normalized hot-rolled plate, but with higher intermediate annealing temperature the beneficial effect of normalizing on magnetic performance of sheet weakens.