3results about How to "Plastic" patented technology

This application provides a quenched and tempered steel plate and its production method. The quenched and tempered steel plate comprises the following components by mass percentage: C: 0.15–0.20%; Si: 0.20–0.40%; Mn: 1.20–1.50%; Cr: 0.20–0.50%; Ni: 0.10–0.20%; Nb: 0.020–0.040%; Ti: 0.010–0.040%; Mo: 0.30–0.50%; B: 0.0010–0.0025%; P≤0.015%, S≤0.004%; N≤0.004%, Als: 0.010–0.060%, with the remainder being Fe and unavoidable impurities. This application manufactures a thick, high-strength quenched and tempered steel plate with high surface quality by adjusting the elemental composition and content of the quenched and tempered steel plate, specifically by adding certain amounts of Ni, Cr, and B.

The application discloses a preparation method of wet sand as-cast high-strength high-plasticity nodular cast iron and belongs to the technical field of metal material casting. The method comprises the following steps: S1. raw material smelting: charging pig iron, scrap steel and furnace charge into a furnace, then adding silicon carbide and carbon additive in sections, and after all the raw materials are dissolved into iron liquid, performing slag removal, slag fishing and silicon carbide pretreatment; S2. spheroidizing treatment and inoculation treatment: adding spheroidizing agent into a spheroidizing ladle, covering steel sheet covering agent and silicon-barium-calcium inoculant, adding iron liquid, performing spheroidizing treatment and ladle bottom inoculation, and adding composite inoculant into the iron liquid during ladle pouring; S3. pouring: adding composite inoculant when pouring the iron liquid into a casting mold, and obtaining a product after cooling; the composite inoculant comprises the following components in percentage by weight: Si: 70.0%-80.0%, Sr: 0.05%-0.15%, Ti: 0.2%-0.6%, Nb: 0.1%-0.3%, and the balance is Fe. Through reasonable formula improvement and process improvement, the prepared nodular cast iron has good strength and toughness and good comprehensive performance.

The invention discloses a novel radioactive ray protection device, and relates to the technical field of radioactive ray protection, the novel radioactive ray protection device comprises an outer package, the inner part of the outer package is provided with a hollow part; a plurality of lead microspheres, the exterior of each lead microsphere is coated with a wear-resistant layer, and the hollow part is filled with each lead microsphere; the vacuumizing equipment is arranged on the outer package and is used for reducing gaps among the lead microspheres and fixing the shape of the outer package, the device is used for protection, the lead microspheres in the device can be adjusted in real time through a computer programmed control system, and gaps without the lead microspheres are only reserved at a scanning ray part; when a tumor patient is subjected to high-energy radioactive ray radiotherapy, the device is used for protection, the lead microspheres in the device are adjusted in real time, and only the lead microspheres at a radiotherapy radiation field part are in a vacant state; omnibearing radioactive ray protection is implemented to the maximum extent.