Abstract: An object of this invention is to provide a single-crystal nickel-based superalloy having high creep rupture strength at high temperatures and excel at corrosion resistance and oxidation resistance at high temperatures. Single-crystal nickel-based superalloys with high temperature strength, hot corrosion resistance and oxidation resistance comprising by weight, 3.0 to 7.0% Cr, 9.5 to 15.0% Co, 4.5 to 8.0% W, 3.3 to 6.0% Re, 4.0 to 8.0% Ta, 0.8 to 2.0% Ti, 4.5 to 6.5% Al, 0.01 to 0.2% Hf, less than 0.5% Mo, 0.01% or less C, 0.005% or less B, 0.01% or less Zr, 0.005% or less O, 0.005% or less N, and balance substantially Ni.

Abstract: In the thermal power system, the electricity production efficiency may be improved by providing turbine members having the improved high temperature characteristic over the corresponding prior art turbine members. Turbine members may be provided by using high resistant steels composed of any one or ones selected from the group consisting of the components, including 0.08 to 0.13% of carbon (C), 8.5 to 9.8% of chromium (Cr), 0 to 1.5% of molybdenum (Mo), 0.10 to 0.25% of vanadium (V), 0.03 to 0.08% of niobium (Nb), 0.2 to 5.0% of tungsten (W), 1.5 to 6.0% of cobalt (Co), 0.002 to 0.015% of boron (B), 0.015 to 0.025% of nitrogen (N), and optionally, 0.01 to 3.0% of rhenium (Re), 0.1 to 0.50% of silicon (Si), 0.1 to 1.0% of manganese (Mo), 0.05 to 0.8% of nickel (Ni) and 0.1 to 1.3% of cupper.

Abstract: A super heat-resisting molybdenum-based alloy is disclosed. The alloy includes two or more alloying elements, the type and amount of the alloying elements being determined such that their average d-orbital energy level (average Md) and average bond order (average Bo) satisfy the following formula (3) and such that Tm is in the range of 2250-2700° C. in the following formula (4), the average Md and Bo being calculated by the formulas (1) and (2), and the bond order (Bo) with molybdenum and a d-orbital energy level being determined by the DV−X&agr; cluster method: Average Bo=&Sgr;Boi×C1  (1) Average Md=&Sgr;Mdi×Ci  (2) 1.718≦average Md≦1.881  (3) Tm(°C.)=(average Bo−0.165×average Md−4.899)/9.279×10−5  (4) wherein, Boi is a bond order of element “i”, Mdi is a d-orbital energy level of element “i”, and C1 is an atomic percent of element “i”.

Abstract: A method of designing a ferritic iron-base alloy having excellent characteristics according not to the conventional trial-and-error technique but to a theoretical method, and a ferritic heat-resistant steel for use as the material of turbines and boilers usable even in an ultrasupercritical pressure power plant.

Abstract: A method of designing a ferritic iron-base alloy having excellent characteristics according not to the conventional trial-and-error technique but to a theoretical method, and a ferritic heat-resistant steel for use as the material of turbines and boilers usable even in an ultrasupercritical pressure power plant. Specifically, the d-electron orbital energy level (Md) and the bond order (Bo) with respect to iron (Fe) of each alloying element of a body-centered cubic iron-base alloy are determined by the Dv-X.alpha. cluster method, and the type and quantity of each element to be added to the alloy are determined in such a manner that the average Bo value and average Md value represented respectively by the following equations:average Bo value=.SIGMA.Xi.(Bo)i 1average Md value=.SIGMA.Xi.

Abstract: A high-Ni austenitic stainless steel having swelling resistance, high-temperature creep strength, and phase stability under irradiation. The irradiation resistance and high-temperature strength of the high-Ni austenitic stainless steel are enhanced when it is composed of the following percentages by weight: Si, not exceeding 0.5 wt. %; Mn, not exceeding 1.0 wt. %; Cr, 13-18 wt. %; Ni, 30-50 wt. %; Mo+W=2.0-6.0 wt. %; Nb+V=0.1-0.8 wt. % (Nb/(Nb+V) ?weight ratio!=0.20-0.85 ?weight ratio!; N, 0.01-0.2 wt. %; and the residual consisting of Fe and unavoidable impurities.

Abstract: An FRP drive shaft wherein the shaft body and the flanges are formed in a body and a method of manufacturing the same are disclosed. The shaft body is formed by winding a resin impregnated fiber on a mandrel having pins on its circumferential surface while hooking the fiber on the pins. The fiber is then circumferentially wound to form a hoop-like reinforcing band near each end of the shaft body. After the pins and end parts of the mandrel are removed, each end portion of the shaft body is expanded by a pressing mold to form a flange. After hot setting, the remaining part of the mandrel is removed.

Abstract: An alloy phase stability index diagram comprising a phase distribution range specified therein by calculating average values Md and Bo of an alloy according to the following formulae with respect to an energy level of "d" orbitals of an alloying element and a bond order between a mother metal and an alloying element:Md=.SIGMA.Xi(Md)i (1)Bo=.SIGMA.Xi(Bo)i (2)where Xi is an atomic fraction of the alloying element (i) and (Md)i and (Bo)i are the Md value and the Bo value, respectively, and by locating alloys with known compositions in the index diagram in which Bo or Md thus defined is taken in an ordinate or an abscissa or Bo and Md are taken in both the coordinates.