Cold rolling method for high-magnetic-induction grain-oriented silicon steel in extremely thin specification

• Main Authors: WU JIANPENG, AI HAO, WANG CHONGTAO, WANG CHAOLEI, ZHU YONGZHANG, MA ZHENGQIANG, ZENG LEMIN, DONG CHUNMING, CAI YANBO, CHEN WENCONG
• Format: Patent
• Language: Chinese; English
• Published: 26.04.2017
• Subjects: MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING

The invention discloses a cold rolling method for high-magnetic-induction grain-oriented silicon steel in the extremely thin specification. The method comprises steps as follows: (1) the thickness before rolling ranges from 2.0 mm to 2.5 mm, and normalization pickling is performed; (2) the primary cold rolling method is adopted, and continuous reversible seven-pass cold rolling is performed: (2.1) rough-surface working rolls are adopted for the first five passes, and fine-surface working rolls are adopted for the last two passes; (2.2) the reduction rate of each pass is controlled, the reduction rate of the first pass ranges from 30% to 45%, the reduction rate of the last pass ranges from 18% to 31%, and the reduction rates of the rest passes range from 24% to 42%; (2.3) technological lubrication and cooling are performed through emulsion spraying; the plate temperature in the first three passes is controlled to gradually increased to 200-230 DEG C; the temperature is reduced for rolling in the fourth pass; t