A nickel-base alloy welding material according to an embodiment comprises: Cr (chromium) larger than 30.0% and less than or equal to 36.0% by mass; C (carbon) less than or equal to 0.050% by mass; Fe (iron) larger than or equal to 1.00% and less than or equal to 3.00% by mass; Si (silicon) less than or equal to 0.50% by mass; Nb (niobium)+Ta (tantalum) less than or equal to 3.00% by mass; Ti (titanium) less than or equal to 0.70% by mass; Mn (manganese) larger than or equal to 0.10% and less than or equal to 3.50% by mass; Cu (copper) less than or equal to 0.5% by mass, and a remainder is Ni and unavoidable impurities.

Reactor components formed using an erosion resistant alloy having desirable high temperature mechanical strength are provided. The erosion resistant components can include, but are not limited to, tubes, re-actors walls, fittings, and/or other components having surfaces that can be exposed to a high temperature reaction environment in the presence of hydrocarbons and/or that can provide pressure containment functionality in processes for upgrading hydrocarbons in a high temperature reaction environment. The erosion resistant alloy used for forming the erosion resistant component can include 42.0 to 46.0 wt. % nickel; 32.1 to 35.2 wt. % um; 0.5 to 2.9 wt. % carbon; 0 to 2.0 wt. % titanium; 0 to 4.0 wt. % tungsten, and iron, with at least one of titanium and tungsten is present in an amount of 1.0 wt. % or more. The iron can correspond to the balance of the composition. Optionally, the erosion resistant alloy can provide further improved properties based on the presence of at least one strengthening mechanism within the alloy, such as a carbide strengthening mechanism, a solid solution strengthening mechanism, a gamma prime strengthening mechanism, or a combination thereof.

An Ni-based alloy pipe for nuclear power has a chemical composition consisting of, in mass percent: C: 0.015 to 0.030%, Si: 0.10 to 0.50%, Mn: 0.10 to 0.50%, P: 0.040% or less, S: 0.015% or less, Cu: 0.01 to 0.20%, Ni: 50.0 to 65.0%, Cr: 19.0 to 35.0%, Mo: 0 to 0.40%, Co: 0.040% or less, Al: 0.30% or less, N: 0.010 to 0.080%, Ti: 0.020 to 0.180%, Zr: 0.010% or less, and Nb: 0.060% or less, the balance: Fe and impurities, and satisfying [(N−Ti×14/48)×d.sup.3≥4000] in relation to an average grain diameter, wherein a standard deviation of grain diameters is 20 μm or less, and a hardness of insides of grains is 180 HV or more.

The present invention provides a tube body that is to be used in a high-temperature atmosphere and a method for stably forming a metal oxide layer on an inner surface of the tube body at a high area percentage wherein the tube body is constituted by a heat-resistant alloy containing Cr in an amount of 15 mass % or more and Ni in an amount of 18 mass % or more, so that the inner surface has an arithmetic average roughness (Sa) of three-dimensional surface roughness that satisfies 1.5 μm≤Sa≤5.0 μm and a skewness (Ssk) of a surface height distribution that satisfies |Ssk|≤0.30, wherein the heat-resistant alloy may contain Al in an amount of 2.0 mass % or more and the inner surface may have a kurtosis (Sku) of a surface height distribution of the three-dimensional surface roughness that satisfies Sku≥2.5.

Disclosed herein are embodiments of a nickel-based alloy. In particular embodiments, the nickel-based alloy is configured for use in applications involving supercritical fluids. The disclosed nickel-based alloy embodiments are highly resistant to corrosion and exhibit high stability and thus are suited for use in vessels, boilers, piping, and other receptacles that contain or are used with supercritical fluids. Method embodiments of making the nickel-based alloy also are disclosed.

The present invention relates to a method for producing metal-comprising geometrically complex pieces and/or parts. The method is specially indicated for highly performant components. It is disclosed a method for the production of complex geometry, and even large, highly performant metal-comprising components in a cost effective way. The method is also indicated for the construction of components with internal features and voids. The method is also beneficial for light construction. The method allows the reproduction of bio-mimetic structures and other advanced structures for topological performance optimization.

Disclosed herein are embodiments of a nickel-based alloy. In particular embodiments, the nickel-based alloy is configured for use in applications involving supercritical fluids. The disclosed nickel-based alloy embodiments are highly resistant to corrosion and exhibit high stability and thus are suited for use in vessels, boilers, piping, and other receptacles that contain or are used with supercritical fluids. Method embodiments of making the nickel-based alloy also are disclosed.

The present invention relates to a nickel-based self-fluxing alloy, a glass manufacturing member, a mold, and a glass gob transporting member having an improved slipperiness against a glass gob. A nickel-based self-fluxing alloy used in a glass manufacturing member for transporting or molding glass with a viscosity of log η=3 to 14.6, comprises: boron (B) in an amount of ranging from 0 percent to 1.5 percent by mass; hard particles; and silicon (Si). Preferably, the amount of boron (B) ranges from 0 percent to less than 1.0 percent by mass. Preferably, the hard particles contain at least one of a carbide, a nitrides, an oxide and a cermet. Preferably, the nickel-based self-fluxing alloy comprises at least one metal selected from Group 4, 5 and 6 elements in an amount of ranging from 0 percent to 30 percent by mass.

To provide a cast product having an alumina barrier layer and method for producing the same. A cast product having an alumina barrier layer of the present invention is a cast product in which an alumina barrier layer containing Al.sub.2O.sub.3 is formed on the surface of a cast body, and the cast body contains C: 0.3 mass % to 0.7 mass %, Si: 0.1 mass % to 1.5 mass %, Mn: 0.1 mass % to 3 mass %, Cr: 15 mass % to 40 mass %, Ni: 20 mass % to 55 mass %, Al: 2 mass % to 4 mass %, rare earth element: 0.005 mass % to 0.4 mass %, W: 0.5 mass % to 5 mass % and/or Mo: 0.1 mass % to 3 mass %, and 25 mass % or more of Fe in the remainder and an inevitable impurity, and 80 mass % or more of the rare earth element is La.

A method for producing a powder of a reinforced alloy (ODS alloy) in which the grains forming the particles of the powder comprise a metal matrix, in the volume of which crystalline oxide particles are dispersed, said method comprising the following successive steps: i) providing a powder mixture to be milled comprising a master alloy intended to form the metal matrix and an additional powder comprising at least one intermediate intended to incorporate atoms intended to form the dispersed oxide particles; ii) milling the powder mixture according to a mechanical synthesis process for making a precursor powder; iii) subjecting the precursor powder to a thermal plasma generated by a plasma torch comprising a plasma gas, in order to obtain the reinforced alloy powder.

The method of the invention is particularly suitable for producing an ODS alloy that has optimized characteristics of composition and/or microstructure.

The invention also relates to the ODS alloy powder obtained by the method of production, and the use thereof.