Abstract: Provided is a low thermal expansion alloy that contains, in mass %, not more than 0.015% of C, not more than 0.10% of Si, not more than 0.15% of Mn, 35.0-37.0% of Ni, and less than 2.0% of Co. Ni+0.8Co is 35.0-37.0%, and the remaining portion is Fe and unavoidable impurities. The low thermal expansion alloy has a solidification structure in which the secondary dendrite-arm spacing is 5 ?m or less, has an average thermal expansion coefficient in a range of 0±0.2 ppm/° C. at 100° C. to ?70° C., and has an Ms point of ?196° C. or less.

Abstract: Provided is a low thermal expansion alloy that contains, in mass %, not more than 0.015% of C, not more than 0.10% of Si, not more than 0.15% of Mn, 35.0-37.0% of Ni, and less than 2.0% of Co. Ni+0.8Co is 35.0-37.0%, and the remaining portion is Fe and unavoidable impurities. The low thermal expansion alloy has a solidification structure in which the secondary dendrite-arm spacing is 5 ?m or less, has an average thermal expansion coefficient in a range of 0±0.2 ppm/° C. at 100° C. to ?70° C., and has an Ms point of ?196° C. or less.

Abstract: A non-magnetic austenitic stainless cast steel having high yield strength at room temperature without losing ductility at liquid nitrogen temperature, permitting easy casting without requiring the solution heat treatment, containing (by mass %) 0.08 percent or less carbon, 0.1 to 1.5 percent silicon, 0.1 to 1.5 percent manganese, 13 to 15 percent nickel, 18 to 19 percent chromium, 2 to 2.5 percent molybdenum, 0.005 to 0.1 percent aluminum, and 0.12 to 0.2 percent nitrogen, with the remainder of the steel being iron and incidental impurities, and having an elongation at liquid nitrogen temperature having 30 percent or more, 0.2% yield strength at room temperature having 240 MPa or more and relative magnetic permeability having 1.10 or less.

Abstract: The object of the present invention is to provide an alloy steel having excellent erosion resistance to molten zinc and used as a material for parts and members for molten zinc plating facilities, e.g. sink roll, coating roll, roll frame and snout. The alloy in the present invention consists essentially of, by weight percent, about 0.10 to 0.17 wt % of carbon, from about 0.30 to 2% of silicon, from about 0.30 to about 2% manganese, from about 10% to 20% nickel, from about 20% to about 35% chromium, from about 0.50% to about 5% molybdenum and from not less than about 0.40% to about 0.75% nitrogen, the balance consisting of substantially of Fe, and unavoidable impurities. Tungsten, from about 0.5% to about 5%, may also be added to enhance the strength of the alloy.

Abstract: A low thermal expansion casting alloy which is excellent in machinability, has a reduced thermal expansion coefficient and is suited for use in applications such as precision machine parts. According to a first aspect of the invention, the alloy comprises, in terms of weight percent, C from 0.4% to 0.8%, Ni from 30.0% to 40.0%, and Co from 2.0% to 8.0%, the Ni and Co contents being in the composition range given by the formula Ni+Co.times.0.75=32.0-40.0%, the balance being Si 1.0% or less, Mn 1.0% or less S 0.2% or less, P 0.2% or less, one or two or Mg and Ca 0.3% or less in total, unavoidable impurities and iron. According to a second aspect, the alloy of the first aspect is heated to a temperature between 600.degree. and 1000.degree. C. and then quenched. Accordingly to a third aspect, the alloy comprises by weight percent C from 0.6% to 1.4% and Ni from 32.0% to 40.0%, the C and Si contents being in the composition range given by the formula C+Si.times.0.5<1.