4results about How to "Improve billet quality" patented technology

This invention relates to a method for producing low-density, high-strength, and high-toughness protective steel plates from continuously cast billets, belonging to the field of metallurgy. The steel plate is an Fe-Mn-Al-C series austenitic low-density steel plate with an austenitic matrix supplemented by dispersed fine precipitated carbides, achieving high strength and high toughness, thus meeting the requirements for ballistic protection. The steel plate has a production thickness of 6-12 mm, a width of 1600-3000 mm, and a density of 6.75-7.05 g / cm³. 3 It has a density 7.85 g / cm³ higher than that of conventional steel. 3 The steel plate exhibits at least a 10% reduction in weight, good machinability and weldability, and excellent ballistic protection performance. A 6mm thick steel plate meets the NATO AEP STANAG 4569 standard Level I ballistic protection requirements, while a 12mm thick steel plate meets the NATO AEP STANAG 4569 standard Level II ballistic protection requirements. Production process: smelting—continuous casting—slow cooling—rolling—heat treatment—finishing—inspection—warehousing.

The application discloses a method for controlling slab corner cracks of a bending section of a continuous casting machine, and specifically comprises the following steps: S1, keeping the whole bending section water-permeable; S2, arranging water blocking mechanisms on the outer arc and the inner arc of the 3-4 zones in the bending section of the continuous casting machine, oppositely arranging the water blocking mechanisms on the outer arc and the inner arc, mounting the water blocking mechanisms on the bending section frame and arranging the water blocking mechanisms between the rollers of the bending section and corresponding water nozzles; arranging the water blocking mechanisms on the upper part and the lower part of the bending section in the vertical direction, and welding and fixing the water blocking mechanisms between the rollers and the water nozzles, covering two water nozzles of the 5th-17th rows of edge portions of the bending section in the pouring direction, wherein the second water nozzle of the edge portion blocks 50% of the spraying area; and S3, synchronously adjusting the water distribution of the bending section according to the total water volume of 90%-100% of the system and the secondary cooling specific water volume in the adjusting range of 0.6-1.2 L / kg to realize water distribution cooperation; and the method can precisely adjust the cooling area, thereby achieving the purpose of solving the slab corner cracks.

This utility model relates to a cooling pipe for a continuous casting billet crystallizer, belonging to the technical field of continuous casting crystallizers. It includes a copper pipe and a water jacket, both being square in shape. The copper pipe is placed inside the water jacket, forming a water gap between them. Multiple axially extending intermediate water grooves are provided on the four outer surfaces of the copper pipe. The depth of these intermediate water grooves on each outer surface of the copper pipe is such that the groove at the center of the plane is deeper, while the grooves on the two sides are shallower. The top surfaces of the intermediate water grooves on each outer surface of the copper pipe are flush, and the depth gradually decreases from the center of the plane to the two sides. This reduces excessive cooling at the corners of the copper pipe, avoids the "sharp corner effect," achieves uniform cooling of the copper pipe, and reduces the risk of corner cracks in the cast billet. It effectively controls the pulsation of the cooling water, reduces the occurrence of "hot spots," improves the cooling effect, and extends the service life of the crystallizer copper pipe.

The application discloses a cooling mold device and a continuous casting method thereof. The cooling mold device comprises a crystallizer assembly and a mold die assembly. The mold die assembly is arranged in the interior of the crystallizer assembly, and the mold die assembly and the crystallizer assembly are conically fitted and installed. The mold die assembly comprises a mold core rod, a first fixed copper sleeve, a second fixed copper sleeve and a plurality of mold inner linings. The plurality of mold inner linings are distributed in a circular array in a circumferential direction. The mold core rod is arranged in a cavity formed between the plurality of mold inner linings. The upper and lower ends of the plurality of mold inner linings are fixed by the first fixed copper sleeve and the second fixed copper sleeve respectively. The cooling mold of the application is composed of multiple materials with different thermal conductivity coefficients arranged in the circumferential direction. The application weakens the problem that the heat exchange coefficient is strong at the lower part and weak at the upper part of the casting blank due to the gravity of the casting blank itself during the horizontal continuous casting process. The cooling during the horizontal continuous casting process is more uniform. Therefore, the casting blank with more uniform structure, composition and performance can be obtained, and the quality of the casting blank is improved.