2results about How to "Inhibit involvement" patented technology

The application discloses a method for synchronously inhibiting pre-crystalline structure and fracture chill layer of a high-pressure casting AlSi10MnMg alloy material, and belongs to the technical field of non-ferrous metal new material preparation. The method comprises the following steps: refining by a transfer ladle, staticizing in a holding furnace, regulating and controlling alloy components to a narrow range, and re-measuring cleanliness; a high-pressure casting whole-process temperature drop control system is constructed, high-temperature staticizing of aluminum liquid in the holding furnace, material ladle heat radiation insulation, high-temperature hot oil circulation insulation of a split pressure chamber, and a three-stage pressure injection process with high slow speed and low fast speed are combined to control the residence time of the aluminum liquid in the pressure chamber, the material ladle soup taking single cycle time and the filling rate of the pressure chamber; and the die casting parameters are optimized to match the split pressure chamber to realize precise mold filling and temperature control. The method can eliminate coarse pre-crystalline structure, reduce the maximum size of the fracture chill layer, improve the microstructure uniformity of the castings, and make the cast body as-cast tensile strength, yield strength and elongation after fracture meet the demand of high-end precision parts on mechanical property stability.

This invention provides an immersion nozzle for continuous casting capable of suppressing the entrainment of protective slag into molten steel. It is an immersion nozzle for injecting molten steel from a tundish into a mold of a continuous casting machine, characterized by comprising: a molten steel rectifying section immersed in molten steel and disposed above the molten steel surface formed inside the mold; and a tubular section extending through the molten steel rectifying section in the vertical direction and discharging molten steel into the interior of the mold. The cross-sectional shape of the molten steel rectifying section, at least within a predetermined range in the casting direction from the molten steel surface to the molten steel, is an elliptical or streamlined shape having a major axis in the width direction of the mold. The molten steel rectifying section has a continuous shape in which the ratio of the minor axis b to the major axis a in the cross-sectional shape of the outer periphery of the molten steel rectifying section is 0.95 or less. The cross-sectional shape of the outer periphery of the tubular section is circular or elliptical in the width direction of the mold, and the ratio of the length β of another axis orthogonal to one axis substantially parallel to the long side of the mold to the length α of that axis is 0.90 or more and 1.1 or less.