2results about How to "Lower transition temperature" patented technology

The invention belongs to the technical field of metallurgy, and particularly relates to 590MPa-grade hot galvanizing dual-phase steel and a production method thereof, and the steel comprises the following chemical components in percentage by mass: 0.02%-0.06% of C, 0.01%-0.03% of Si, 0.90%-1.8% of Mn, less than or equal to 0.025% of P, less than or equal to 0.010% of S, 0.005%-0.010% of Al, 0.05%-0.30% of Cr, 0.05%-0.30% of Mo, less than or equal to 0.0060% of O, 0.010%-0.020% of N, and the balance of Fe and inevitable impurities. The method has the advantages that low carbon-silicon-aluminum and high nitrogen are cooperatively regulated and controlled in component design, and in the hot rolling process, premature precipitation of AlN particles in the hot rolling process is effectively inhibited by controlling the low coiling temperature, so that a large amount of nitrogen is reserved in a hot rolled plate in a solid solution state.

The present application provides an optical glass, a preparation method thereof and an optical element, the optical glass comprising the following composition in terms of cationic mole percentage: Si 4+ : 0~6%; B 3+ : 40~50%; La 3+ : 15~25%; Y 3+ : 0~5%; Ti 4+ : 4.5~8.5%; Nb 5+ : 0~5%; W 6+ : 0~2%; Zr 4+ : 0~5%; Zn 2+ : 10.5~16.5%; Li + : 2~5%; Na + : 0~5%; K + : 0~5%; Sb 3+ : 0~0.1%; the optical glass has a refractive index n d of 1.85~1.88, an Abbe number υ d of 32~36, and a transition temperature Tg lower than 600℃. The optical glass provided by the present application has low density, high transmittance, and good processability and stability.