摘要
含硅量高达4.8％,厚度为0.10～0.50mm的热轧无取向电工钢在佛赫·伊斯特斯基冶金工厂被轧制成600×600mm至1000×1000mm的电工钢片。整个工艺过程包括平炉或者电炉冶炼、多道次热轧成材、成垛退火以及酸洗。
Hot-rolled non-oriented electrical steels with silicon content up to 4.8% and thickness 0.10—0.50mm had been produced by Verkh-Isetsky Metallurglcal works. The whole process includes steel-making in open-hearth or electric furnaces,-blooming and multi-pass hot-rolling into sheets, pack-annealing and pickling. Hot-rolled electrical steel sheets have good isotropy of mechanical and magnetic propertiers, high resistivity and insensitivity to elastic stresses. Anisotropy of the magnetic induction B2500 does not exceed 0.03T when steels with Si content ahove 4.0%. It is helpful to the orientation of course grain structures and non-metallic inclusions. Increasing of the annealing temperature decreases the anisotropy effects. The magnetic properties mainly depend on grain sizes. Usually, each square milimetre contains 10 to 100 grains. Permeability increases and low frequency core loss decrease when grain size incrasses. Electrical steel contains finer grains and its core loss becomes less when magnetization frequency exceeds 1—5 kHZ. The electrical steel with silicon content more than 4.00% are suitable for working at frequency up to 20 kHz. When magnetic cores are pressed, nonflatness will occur in the electrical steel sheet which brings about the increase of the internal stresses and deterioration of the magnetic properties. In this case, magnetic induction at the edge and centre may decrease up to 15% and core loss P10/50 may increase up to 25%. Finally, annealing with plain temp erature gradients will cause nonflatness less than 4mm and maintain the magnetic properties of steel in cores from deterioration.
出处
《上海金属》
CAS
1990年第1期23-24,共2页
Shanghai Metals
