China Baowu Steel Group has been granted a patent for an electromagnetic stirring device and method for a secondary cooling zone during slab continuous casting. The device includes a main body, an opening adjustment assembly, and a secondary cooling assembly. The device uses electromagnetic stirring to cool molten steel and includes adjustable opening degrees and cooling water sprays for efficient cooling. GlobalData’s report on China Baowu Steel Group gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on China Baowu Steel Group, AI for workflow management was a key innovation area identified from patents. China Baowu Steel Group's grant share as of September 2023 was 69%. Grant share is based on the ratio of number of grants to total number of patents.

Electromagnetic stirring device for secondary cooling in continuous casting

Source: United States Patent and Trademark Office (USPTO). Credit: China Baowu Steel Group Corp Ltd

A recently granted patent (Publication Number: US11772153B2) describes an electromagnetic stirring device for the secondary cooling zone of slab continuous casting. The device consists of a main body, an opening adjustment assembly, and a secondary cooling assembly. The main body includes a protective shell, a phase sequence control assembly, an iron core, and an electromagnetic coil. The opening adjustment assembly comprises a cylinder, a fixing base, a movable joint shaft, and multiple pieces of silicon steel sheet group inserts. These inserts are connected by the movable joint shaft to form movable joints that are connected to the iron core, creating a closed annular structure. The electromagnetic coil generates an alternating magnetic field in this structure as the casting slab passes through it. The cylinder, fixedly installed on the main body, provides the force to open and close the movable joints.

The secondary cooling assembly includes a cooling water inlet and multiple cooling water nozzles. Cooling water is transmitted into the protective shell through the inlet, where the electromagnetic coil and iron core are immersed. The cooling water is then sprayed onto the surface of the casting slab through the cooling water nozzles.

The patent also describes the phase sequence control assembly, which includes a water-cooled cable, an alternating phase conversion circuit, a fuse, and a disconnecting switch. The water-cooled cable connects the three-phase power supply to the electromagnetic coil. The alternating phase conversion circuit controls the on-off of the first and second contactors, which are connected to the electromagnetic coil. The alternating voltage in the circuit has a frequency of 0.1 Hz to 1 Hz.

The protective shell of the device is designed with cambered structures that match the profiles of segmented rollers. Water sealing gaskets are used to ensure a tight connection between the iron cores and the protective shell.

The patent also includes a method for electromagnetic stirring using the described device. The method involves adjusting the opening degree of the closed annular structure based on the thickness of the casting slab, energizing the phase sequence control assembly to produce an alternating magnetic field, and introducing cooling water into the protective shell to cool the electromagnetic coil and iron core.

Overall, this patent presents an electromagnetic stirring device and method that can be used in the secondary cooling zone of slab continuous casting, providing efficient cooling and stirring of molten steel.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.