摘要:
There is provided an austenitic stainless steel which is corrosion-resistant in an environment of neutron irradiation, and can suppress stress corrosion cracking and embrittlement. At least one kind of additive selected from Ti more than 0.2 % by weight up to 0.6 %, Zr more than 0.2 % up to 1.14%, Hf more than 0.2% up to 2.24 %, V more than 0.2 % up to 0.64 %, Nb more than 0.5 % up to 1.17 % and Ta more than 0.5 % up to 2.27 % is added to austenitic stainless steel containing Cr, Ni and so on, and said at least one additive exists in a solid-solution state. Further, the steel has a wholly austenitic structure substantially free of carbide. In order to maintain the irradiation-induced segregation prevention effected by the addition element, the C content is limited to 0.01 to 0.008 %, and the N content is limited to 0.001 to 0.1 %. The irradiation-induced segregation of the constituent elements, such as Cr and Ni, occurring in a grain boundary under irradiation, and the deterioration of the corrosion resistance of the material, as well as the embrittlement, can be prevented.
摘要:
Heat-resistant nitride dispersion strengthened alloys provided with a base metal consisting of Fe-based ferrite steel, Fe-based austenitic steel or Ni-based alloy, and AlN particles or BN particles dispersed in a matrix of the base metal and increasing a heat resistance of the base metal. The alloys are heat-resistant strengthened alloys superior in high temperature strength with the AlN particles or the BN particles dispersed therein.
摘要:
A method for treating a gas flow containing organohalogen compounds comprising the steps of contacting the gas flow with catalyst at a temperature below 500 °C in the presence of an effective amount of steam, wherein the catalyst contains titania, tungsten oxide, and silica, an atomic ratio of Ti and w is in the range of 20 ∼ 95 mol % Ti and 80 ∼ 5 mol % W, and the amount of silica to titania is in the range of 0.5 ∼ 15 wt. %. In accordance with the present invention, the organohalogen compound can be decomposed effectively to carbon monoxide, carbon dioxide, and hydrogen halide. The catalyst of the present invention also has s superior durability.
摘要:
A superconducting wire saved in weight and enhanced in mechanical properties is provided without damaging electric and thermal characteristics as an Al stabilizer, and further a method for producing the same, a high strength Al sintered alloy (16) and powders used for the process are provided. A superconducting wire comprising an Al alloy (16) of a high purity Al in which a small amount of ceramic ultrafine particles are dispersed and superconducting filaments (15) embedded in the Al alloy (16), in which a large number of the ceramic ultrafine particles are dispersed in the area of 1 µm², and the areas of 1 µm² in which a large number of the ceramic ultrafine particles are dispersed, are formed over nearly the whole of the alloy (16).
摘要:
This invention provides austenitic steel having a superior resistance to neutron irradiation, a nuclear reactor and a nuclear fission reactor using such steel. In the present invention, austenitic steel containing at least one of Pd and Pt is used for a member which undergoes neutron irradiation in high-temperature water. More specifically, the steel consists essentially of not more than 0.02% C, not more than 1% Si, 0.5-15% Mn, 9-26% Cr, 8-20% Ni, 0.5-3% Mo, at least one kind of 0.1-15% selected from the group consisting of Pd and Pt, and not less than 50% Fe, and may further contain not more than 1.0% of at least one kind selected from the group consisting of Nb, Ti, Zr, Hf and V, and this is used for structural members in a core of a nuclear reactor and a nuclear fission reactor.
摘要:
Heat-resistant nitride dispersion strengthened alloys provided with a base metal consisting of Fe-based ferrite steel, Fe-based austenitic steel or Ni-based alloy, and AlN particles or BN particles dispersed in a matrix of the base metal and increasing a heat resistance of the base metal. The alloys are heat-resistant strengthened alloys superior in high temperature strength with the AlN particles or the BN particles dispersed therein.