9results about How to "Improve billet quality" patented technology

This invention discloses a novel bulletproof steel plate with a thickness of 12-35mm, comprising the following chemical composition by weight percentage (unit: wt%): C: 0.25-0.28, Si: 1.20-1.40, Mn: 1.50-1.60, P: ≤0.007, S: ≤0.001, Cr: 0.50-0.60, B: 0.0015-0.0023, Ti: 0.03-0.04, with the remainder being Fe and residual elements; it eliminates the need for the addition of Ni, Mo, and rare earth elements, thus reducing alloy costs. In terms of production process, clean steel smelting is used to control the P and S content, thereby improving impact toughness; pressure quenching is employed with multi-point pressure application and reasonable distribution of water volume and pressure in each section of the high-pressure zone to achieve uniform cooling and flatness of the steel plate; furthermore, low-temperature tempering is used to effectively eliminate the influence of residual internal stress in the steel plate and improve the subsequent processing performance of the steel plate, such as cutting and welding. The resulting bulletproof steel has a tensile strength of 1700-1800MPa, a surface hardness of >500HBW, and an impact energy of >40J at -20℃, which fully meets the requirements for use of bulletproof steel plates.

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 an energy-saving multifunctional casting blank flame cleaning device, wherein fixed end pistons and floating end pistons are additionally arranged in the cleaning oxygen cavity of the upper and lower horizontal distributor piston cylinder assembly, the cleaning oxygen cavity is divided into three chambers, i.e., a fixed end chamber, an intermediate use chamber and a floating end chamber, the casting blank cross section is divided into eight optional cleaning areas, PID adjustment is performed on the other eight cleaning areas by using independent valve stations, multifunctional combination of the eight optional cleaning areas is realized, the surface defects of the casting blank can be cleaned in a fixed area and a fixed depth, unnecessary area cleaning is reduced, metal loss is reduced, the yield of finished products is increased, cost reduction and benefit increase are achieved, and the energy consumption is reduced. For hot blank, oxygen pressure of the relatively low temperature area at the edge, such as the top fixed end, the top floating end, the bottom fixed end and the bottom floating end, is increased to obtain a target cleaning depth, improve the hot blank hot delivery rate, reduce the energy consumption and help green metallurgy.

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 invention belongs to the technical field of casting, and particularly relates to a die casting protection casting device and a using method thereof. The die casting protection casting device is connected to a ladle nozzle in a sealed mode and comprises an upper sealing assembly, a lower sealing assembly and an adjusting device, and the upper sealing assembly and the lower sealing assembly are connected in a sealed and pressed mode. The adjusting device is connected to the steel ladle casting vehicle and connected with the upper sealing assembly. A ladle nozzle and a molten steel flowing area are wrapped, non-oxidation protection in the whole casting process is achieved, and the casting blank quality is improved.

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.

This invention discloses a method for producing 1860MPa grade rare earth steel strand wire rod, comprising: smelting process; continuous casting process; rolling process: billet heating; controlled rolling parameters; controlled cooling process; the chemical composition of the wire rod by weight percentage is: C: 0.80-0.84%, Si: 0.20-0.30%, Mn: 0.75-0.85%, Cr: 0.18-0.22%, P≤0.015%, S≤0.010%, Ce: 0.002-0.004%, La: 0.001-0.002%, Al: 0.02-0.04%, Cu≤0.02%, As≤0.01%, O≤0.0015%, N≤0.008%, with the balance being Fe and unavoidable impurities; wherein the Si / Cr ratio is 0.9-1.7. The purpose of this invention is to achieve stable and compliant mechanical properties, improved production efficiency and environmental friendliness, and controllable costs through synergistic optimization of components and processes.

The invention discloses a method for predicting, regulating and controlling liquid level fluctuation of a slab continuous casting crystallizer. The method comprises the steps that current process control parameters of the crystallizer are obtained; inputting the current process control parameter into a pre-constructed liquid level fluctuation amplitude prediction model to obtain a crystallizer liquid level fluctuation amplitude which is output by the liquid level fluctuation amplitude prediction model and corresponds to the current process control parameter, the liquid level fluctuation amplitude prediction model is a power function expression which is obtained through regression analysis inversion by combining physical simulation experiment data with the crystallizer liquid level fluctuation amplitude as a response variable after a dimensionless relational expression used for describing crystallizer liquid level fluctuation is determined on the basis of a dimensional analysis principle. According to the method, the crystallizer liquid level fluctuation amplitude can be quickly predicted based on the current process control parameters by utilizing the prediction model. The model not only improves the prediction efficiency, but also quantifies the influence degree of each parameter on the fluctuation of the liquid level, provides a clear regulation and control direction, and is beneficial to the improvement of the quality of the casting blank under the working condition of high pulling speed.