2 results about "Sn element" patented technology

This invention discloses a low-carbon tin-containing free-machining steel and its production method. The weight percentage (wt%) of the chemical composition in the steel is: C 0.06-0.15, Si 0.10-0.30, Mn 1.50-1.80, S 0.40-0.60, P 0.06-0.10, Sn 0.30-0.50, Mn / S≥4.0, Sn / S≥0.80, O: 130-200ppm, with the remainder being iron and unavoidable impurities. This invention, through compositional design, controls Mn / S≥4.0 to improve the spindle morphology of sulfides, and Sn / S≥0.80 to achieve Sn aggregation near sulfides and grain boundaries, as well as aggregation and precipitation in other areas of the material matrix, which is more conducive to improving the material's machinability and reducing turning cracks. The Sn element is added using a combined addition technology of the tundish impact zone and the crystallizer nozzle, which improves the Sn yield.

The application discloses a high-temperature titanium alloy and a preparation method and application thereof, and belongs to the technical field of high-temperature titanium alloys. The alloy contains Al, W, Si, C, Sn and Ti, Sn is a core control element, and the addition amount is 8.0-12.0%. The preparation method comprises the following steps: mixing raw materials, pressing into an electrode block and welding, three times of vacuum self-consumption arc smelting, six times of grading forging (including blooming, single-phase zone forging and multi-wheel two-phase zone forging), solid solution and aging treatment. Through Sn element control and process optimization, the alloy forms Ti3(Al, Sn) and Ti4(Al, Sn) ordered phases, has the advantages of high strength, excellent high-temperature oxidation resistance and low cost, can be used for preparing high-temperature components such as aerospace engine blades and casings, and provides a new idea for high-temperature titanium alloy composition optimization and engineering application.