18564171. METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET simplified abstract (JFE STEEL CORPORATION)
Contents
METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
Organization Name
Inventor(s)
Masanori Takenaka of Chiyoda-ku, Tokyo (JP)
Takeshi Imamura of Chiyoda-ku, Tokyo (JP)
Takaaki Tanaka of Chiyoda-ku, Tokyo (JP)
Hiroi Yamaguchi of Chiyoda-ku, Tokyo (JP)
METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET - A simplified explanation of the abstract
This abstract first appeared for US patent application 18564171 titled 'METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
Abstract: In the production of a grain-oriented electrical steel sheet, a steel slab is heated to 1300°C or higher, followed by hot rolling, hot-band annealing, cold rolling, and primary recrystallization annealing. An annealing separator is applied to the surface of the steel sheet, and finishing annealing is performed to prevent edge cracks. By controlling the slab lateral face temperature during hot rolling and carrying out width reduction after rough rolling, edge cracks are effectively prevented.
- Simplified Explanation:
- Production process of grain-oriented electrical steel sheet - Heating steel slab to high temperature - Hot rolling, annealing, cold rolling, and recrystallization - Application of annealing separator and finishing annealing - Prevention of edge cracks by controlling temperature and width reduction
- Key Features and Innovation:
- Controlled heating process - Application of annealing separator - Prevention of edge cracks through temperature control and width reduction
- Potential Applications:
- Electrical transformers - Motors - Generators
- Problems Solved:
- Prevention of edge cracks in steel sheet production - Improved quality of grain-oriented electrical steel
- Benefits:
- Higher quality steel sheets - Increased efficiency in transformer and motor production
- Commercial Applications:
- Manufacturing of electrical transformers - Production of high-quality electrical motors - Industrial generator manufacturing
- Questions about Grain-Oriented Electrical Steel Sheet:
1. How does the temperature control during hot rolling prevent edge cracks? - By keeping the slab lateral face temperature below a certain threshold defined by the expression T=-120000[% S]+1400.
2. What is the significance of applying an annealing separator on the surface of the steel sheet? - It helps in preventing edge cracks and improving the overall quality of the steel sheet.
Original Abstract Submitted
In the production of a grain-oriented electrical steel sheet by heating a steel slab containing, in mass %, C: 0.02 to 0.10%, Si: 2.5 to 5.5%, Mn: 0.01 to 0.30%, S: 0.0010 to 0.040%, Se: 0 to 0.040%, sol. Al: 0.010 to 0.040%; and N: 0.004 to 0.020% to 1300° C. or higher; subsequently performing hot rolling, hot-band annealing as necessary, cold rolling, and primary recrystallization annealing which also serves as decarburization annealing; applying an annealing separator on the surface of the steel sheet; and performing finishing annealing, edge cracks that may occur in the hot rolling are effectively prevented by keeping a slab lateral face temperature at a time of starting rough rolling during the hot rolling equal to or lower than a temperature Tdefined by the following Expression T=−120000 [% S]+1400 (1) and carrying out width reduction after at least one pass in the rough rolling.
