Abstract: A heat treatment method for strengthening cold worked tubes made from nickel-base alloys without an attendant loss in corrosion resistance properties. Especially useful for tubes destined for energy resource recovery areas, oil fields, sour gas wells, etc., the tubes may be heated from 316.degree.-769.degree. C. (600.degree.-1100.degree. F.) for up to an hour.

Abstract: A method of making a work-strengthenable alloy which includes a gamma prime phase which method comprises forming a melt comprising the following elements in percent by weight:______________________________________ molybdenum 6-16 chromium 13-25 iron 0-23 nickel 10-55 carbon 0-0.05 boron 0-0.05 cobalt balance, at least 20, ______________________________________said alloy also containing one or more elements which form gamma prime phase with nickel, the electron vacancy number, N.sub.v, of the alloy being defined byN.sub.v =0.61 Ni+1.71 Co+2.66 Fe+4.66 Cr+5.66 Mowherein the respective chemical symbols represent the effective atomic fractions of the respective elements present in the alloy, said value not exceeding the valueN.sub.v =2.82-0.017 W.sub.Fe,where W.sub.Fe is the percent by weight of iron in the alloy for those alloys containing no iron or less than 13 percent by weight iron and W.sub.

Abstract: A nickel-chromium alloy with addition of silver used for ornamental purposes, such as for spectacles frames wherein silver particles of the alloy are arrayed in lines in substantially one direction. The average ratio of the longitudinal distance and width of the line is preferably more than 10.

Abstract: A structural part for use in high temperature aqueous medium consists of an austenitic nickel-chromium-iron alloy containing by wt. 5 to 10% of iron, 18 to 20% of chromium and more than 60% of nickel. All components of the alloy, but chromium, may be in the standard ranges of well-known and proven alloys, typically 600 and X750 alloy.

Abstract: A heat resistant steel of the present invention contains 0.05 to 0.2 wt. % of C, less than 0.5 wt. % of Si, less than 0.6 wt. % of Mn, 8 to 13 wt. % of Cr, 1.5 to 3 wt. % of Mo, 2 to 3 wt. % of Ni, 0.05 to 0.3 wt. % of V, 0.02 to 0.2 wt. % in total of either or both of Nb and Ta, 0.02 to 0.1 wt. % of N and the balance substantially Fe. Since a gas turbine of the present invention is constituted by members, such as discs, blades, shafts and so forth, made of alloys of this kind, the gas turbine has a structure in which it is possible to achieve a high level of creep rupture strength and Charpy impact value.

Abstract: A wear-resistant alloy of high permeability having an effective permeabil of at least about 3,000 at 1 KHz, a saturation magnetic flux density of at least about 4,000 G, and a recrystallization texture of {110}<112>+{311}<112> is provided. The alloy is produced by cold working a forged or hot worked ingot of an alloy of a desired composition at a cold working ratio of at least about 50%, heating the cold worked alloy at a temperature which is below the m.p. of the alloy and not less than about 900.degree. C., and cooling the heated alloy from a temperature which is not less than an order-disorder transformation point (about 600.degree. C.) of the alloy. Alternatively, the alloy is produced by reheating the cooled alloy to a temperature which is not over than the order-disorder transformation point, and cooling the reheated alloy.

Abstract: A process for producing large section, large mass forged sleeves of alloy 625 comprising forming the workpiece from large, diameter ingots of alloy 625 or from hot isostatically pressed alloy 625 powder, saddle forging the workpiece, mandrel forging the workpiece, thermal treating the workpiece and finish machining the workpiece.

Abstract: An alloy having the following composition limits by weight:Chromium 13-15%, silicon 3.4-4.2%, boron 1.7-2.3% and the balance nickel, is cast in a mold that is made by the lost wax process from CaCO.sub.3, so that when the molten metal alloy is cast in the preheated mold at 2300.degree. F., held in a furnace at 1750.degree. F. for an hour, and then rapidly cooled to room temperature. The casting will have a fairly low hardness of R.sub.c 30.+-.3 so that it can be machined. After machining, the casting is heated to a temperature of 1150.degree. F. for at least three hours before cooling, resulting in a casting that is hardened to R.sub.c 45 to R.sub.c 50.

Abstract: A work hardened nickel-cobalt alloy having high strength and ductility at temperatures of about 1300.degree. F. is provided consisting essentially by weight of about 0.05% max carbon, about 20%-40% cobalt, about 6%-11% molybdenum, about 15%-23% chromium, about 1.0% max iron, about 0.0005%-0.020% boron, about 0%-4% titanium, about 0%-2% columbium and the balance nickel, the alloy having been cold worked at a temperature below the HCP-FCC phase transformation zone to a reduction in cross-section between 5% and 50%.

Abstract: Nickel-base alloys containing special and correlated percentages of chromium, iron, molybdenum, titanium, columbium, aluminum etc. (i) provide an attractive combination of strength, ductility, resistance to environmental media and other desirable characteristics, (ii) can be processed by cold working and age hardening to achieve yield strengths of 150,000 psi (1034 MPa) to 200,000 psi (1379 MPa) together with tensile elongations of 10% to 20%, (iii) are resistant to such corrosive media as hydrogen sulphide and acid chloride solutions, and to hydrogen embittlement, and (iv) are useful for, inter alia, petroleum production tubing and sulfur dioxide gas scrubber applications.

Abstract: A process for producing large section, large mass cylindrical sleeves of alloy 625 by employing full length saddle forging techniques comprising forming the workpiece into a full length member, saddle forging the workpiece, air cooling the forging to room temperature following saddle forging, thermal treating and annealing the forging and finish machining the forging to form the finished large section, large mass cylindrical sleeve of alloy 625.

Abstract: Amorphous Nickel-base alloys for electrical resistors, which contain, by atomic %, 81-x% Ni, x% Cr, 6% B and 13% Si (z=0.about.25), or 70% Ni, 11% Cr, 19-y% B and y% Si (y=0.about.19 except 13), or 100-z% of 0.864 Ni and 0.136 Cr and z% of 0.316 B and 0.684 Si (x=15.about.25 except 19), and have a relatively high electrical resistivity and a small temperature coefficient of resistivity, are disclosed. Their resistance values can be adjusted by heat treatment and the thermal stability of them after heat treatment is very good in the conventional operating temperature range of electrical components.

Abstract: A method of manufacturing nickel-iron-chromium alloys for use with recuperators. A combination of intermediate annealing, cold working and final annealing results in an alloy having a greater yield strength than a corresponding solution annealed material. The resultant alloy exhibits an isotropic structure and has high corrosion resistance, a low coefficient of expansion and high levels of ductility and strength.

Abstract: A process for producing large section, large mass cylindrical sleeves of alloy 625 by employing full length saddle forging technique comprising forming the workpiece by forging it into a full length member, trepanning the member to form the workpiece, saddle forging the workpiece, air cooling the forging to room temperature following saddle forging, thermal treating and annealing the forging and finish machining the forging to form the finished large section, large mass cylindrical sleeve of alloy 625.

Abstract: A process for producing large section, large mass forged sleeves from large diameter ingots of alloy 625 comprising the steps of cutting the ingot to produce the workpiece, trepanning the workpiece and facing the ends of the workpiece, saddle forging the workpiece, mandrel forging the workpiece, thermal treating the workpiece and finish machining the workpiece.

Abstract: A method is disclosed for preparing a dimensionally stable electrode structure, particularly nickel-chromium anodes, for use in a molten carbonate fuel cell stack. A low-chromium to nickel alloy is provided and oxidized in a mildly oxidizing gas of sufficient oxidation potential to oxidize chromium in the alloy structure. Typically, a steam/H.sub.2 gas mixture in a ratio of about 100/1 and at a temperature below 800.degree. C. is used as the oxidizing medium. This method permits the use of less than 5 weight percent chromium in nickel alloy electrodes while obtaining good resistance to creep in the electrodes of a fuel cell stack.

Abstract: A wear-resistant alloy of high permeability having an effective permeabil of at least about 3,000 at 1 KHz, a saturation magnetic flux density of at least about 4,000 G, and a recrystallization texture of {110}<112>+{311}<112> is provided. The alloy is produced by cold working a forged or hot worked ingot of an alloy of a desired composition at a cold working ratio of at least about 50%, heating the cold worked alloy at a temperature which is below the m.p. of the alloy and not less than about 900.degree. C., and cooling the heated alloy from a temperature which is not less than an order-disorder transformation point (about 600.degree. C.) of the alloy. Alternatively, the alloy is produced by reheating the cooled alloy to a temperature which is not over than the order-disorder transformation point, and cooling the reheated alloy.

Abstract: A heat treatment is described for producing a desired microstructure in Hastelloy Alloy X components which have small diameter, closely spaced, laser pierced holes therein. The heat treatment produces a small grain size and discontinuous carbide morphology in the component prior to the hole piercing operation, which reduces the propensity for cracking which has been found to be associated with the hole piercing operation. After the piercing operation, the component is heat treated again to increase the grain size and produce a microstructure which provides the optimum balance of creep strength and fatigue strength.

Abstract: A solid solution, nonmagnetic, austenitic nickel base alloy class is described. It contains: about 12 to 21 weight percent chromium; a concentration of molybdenum and/or tungsten, such that the sum of the weight percent molybdenum and one third the weight percent tungsten present is between 1 and 7 weight percent and wherein the w % tungsten is less than 12 w %; about 4 to 13 w % iron; small but effective amounts of the desulfurizing agent, manganese; and up to about 2.5 w % silicon. Carbon may be present at levels up to 0.15 w % and cobalt may be present at levels up to 2 w %. The above elements are balanced to provide alloys having a mean thermal expansion coefficient, .alpha..sub.(RT-T), for T.ltoreq.1000.degree. F., of less than 8.3.times.10.sup.-6 in./in./.degree.F., and preferably less than 8.times.10.sup.-6 in./in./.degree.F.In addition, a precipitation hardening, non-magnetic, austenitic nickel base alloy class is also described.

Abstract: This invention relates to platinum group metal-containing alloys comprising, apart from impurities:(a) at least 40 wt. % nickel or at least 40 wt. % cobalt;(b) a trace to 30 wt. % chromium; and(c) a trace to 15 wt. % of one or more of the metals platinum, palladium, rhodium, iridium, osmium and ruthenium.

Abstract: A method is described for continuously casting an ingot of a metal alloy of a type having a substantial liquidus-solidus temperature range to produce internal microstructure of a desired fineness. Molten alloy is flowed along an electron beam heated skulled hearth while controlling the electron beam to maintain a solids content in the alloy on the hearth of between about 15% and about 40%. The alloy is poured from the hearth into the top of a continuous casting mold at a rate which produces a thixotropic region at the upper end of the fully solidified alloy in the mold. The ingot produced is characterized by a macrostructure in excess of one millimeter average grain dimensions with a non-uniform shape, orientation, and distribution, and is characterized by a microstructure of the order of fifty micron cell spacing of dendritic crystallites comprising the microstructure.

Abstract: Ni-Cr type allow materials comprising 10 to 50 atom % of Cr, 5 to 25 atom % of Al and/or Si, and the balance to make up 100 atom % of substantially pure Ni, excelling in cold workability, and exhibiting high electric resistance.These alloy materials possess very high electric resistance and small electrical resistance temperature coefficients over a wide temperature range from room temperature to elevated temperatures, and have excellent cold workability, mechanical properties, durability, ability to resist oxidation, corrosion, and fatigue as well as strain gauge sensitivity. The alloys are very useful as industrial materials of varying types including electrical resistors, precision resistors, and electrically heating wires used at elevated temperatures and bracing materials, reinforcing materials, and corrosionproofed materials used at elevated temperatures.

Abstract: There are described construction parts for gaseous hydrogen containing media which construction parts are made of a nickel alloy containing 40 to 70% nickel, 15 to 30% chromium, 0 to 20% cobalt, 5 to 10% molybdenum, and 0 to 20% iron and which construction parts have optimum hydrogen permeation prevention properties. For this purpose, the alloys contain 0.5 to 0.8% manganese and the parts are provided with a 1 to 10 .mu.m thick oxide coating by treating at a temperature of 850.degree. to 1000.degree. C. in an oxidizing atmosphere.

Abstract: Certain high strength alloys lacking resistance to hydrogen embrittlement are cold worked and heat treated utilizing critical preselected conditions to result in a unique alloy having increased resistance to hydrogen embrittlement without unacceptable loss of strength. It is theorized that this unexpected improved resistance correlates with the concentration of certain elements, such as phosphorus and sulfur as impurities on the crystallographic boundary surfaces of the alloy.

Abstract: The invention teaches the improvement of certain super alloys by exposing the alloy to an atmosphere of elemental nitrogen at elevated temperatures in excess of 750.degree. C. but less than 1150.degree. C. for an extended duration, viz., by nitriding the surface of the alloy, to establish barrier nitrides of the order of 25-100 micrometers thickness. These barrier nitrides appear to shield the available oxidizing metallic species of the alloy for up to a sixfold improved resistance against oxidation and also appear to impede egress of surface dislocations for increased fatigue and creep strengths.

Abstract: There is disclosed a wear-resistant alloy which comprises, in terms of weight ratio, 10 to 45% of chromium, 3 to 15% of niobium, 4 to 20% of molybdenum, 0.01 to 2.0% of boron, and nickel as the remainder.The wear-resistant alloy having a novel composition of the present invention is suitable for face portions of valves used in various plants such as a chemical plant and an atomic power plant, parts of jet pumps and sliding parts for various machines.

Abstract: Coatings are disclosed (a) which are useful by themselves to substantially improve the surface properties of substrates to which they are applied and (b) which are useful as subcoats to substantially improve the bonding of coatings of nitrides, carbides and borides of titanium, hafnium and zirconium to such substrates. The coatings which are disclosed are novel materials characterized by a microcrystalline, single-phase, solid solution structure comprising:(a) about 20 to 70% by weight of at least one element from the group consisting of cobalt and nickel;(b) about 8 to 35% by weight of chromium;(c) about 3 to 20% by weight of at least one element from the group consisting of molybdenum and tungsten; and(d) about 0.5 to 10% by weight of at least one element from the group consisting of carbon, nitrogen and boron.

Abstract: A nickel based high melting point, homogeneous, ductile brazing foil composition consists essentially of about 17 to 20 atom percent chromium, about 4 to 10 atom percent boron, about 10 to 16 atom percent silicon, the balance being nickel and incidental impurities. The composition is such that the total of nickel and chromium ranges from about 74 to 84 atom percent.

Abstract: A nickel-base alloy containing principally chromium molybdenum and tungsten is disclosed. The alloy is especially resistant to corrosion in a variety of corrosive media including oxidizing acids and reducing acids; furthermore, the alloy is not subject to localized corrosive attack, known as the "pitting" test. The alloy nominally contains 22% chromium, 13% molybdenum, 3% tungsten, 3% iron and the balance nickel plus small amounts of adventitious elements and impurities. Molybdenum and tungsten must be present in a ratio of about 4 to 1 respectively for optimum benefits of the invention.

Abstract: A component possessing high resistance to corrosion and oxidation, composed of a dispersion-hardened superalloy having a high creep strength, comprises a coarse-grained core (1) which has high strength at high temperatures, and a fine-grained skin zone (2) which forms a case. The component is manufactured with the aid of a heat-treatment, or thermomechanical treatment, in a manner such that, starting from a fine-grained initial condition, the skin zone (2) is restrained from participating in the recrystallization which leads to the formation of coarse grains in the core (1).

Abstract: The weld zone in Hastelloy X nickel superalloy is thermal mechanically worked by cold working the weld zone to reduce its thickness by about 5-40%, and by annealing at 1120.degree.-1175.degree. C. for one hour to cause recrystallization. Low cycle fatigue properties of laser and gas tungsten arc weld zones are substantially increased.

Abstract: Reactive metal-nickel alloys containing controlled amounts of molybdenum, chromium, iron, copper, and mixtures thereof are suitable for brazing ceramics, other non-metallic and metallic materials.

Abstract: Hard facing nickel-base alloys comprising 0.05 to 1.5% by weight of boron, 3 to 7% by weight of silicon, 7.5 to 35% by weight of chromium, 0.05 to 1.5% by weight of carbon, and if necessary, less than 30% by weight of iron and/or less than 5% by weight of tungsten, the balance being nickel, with the weight ratio of silicon to boron being equivalent to or exceeding 3.3. The alloys have a high degree of toughness, ductility, wear resistance and corrosion resistance, and no cracks occur in the hard facing layer. Addition of 0.1 to 3% by weight of the tin and/or 0.1 to 3% by weight of tantalum remarkably increases the corrosion resistance. The alloys can be used as a hard facing material to be applied to parts of various instruments, machines and plants.

Abstract: A nickel-base alloy, particularly suitable for high temperature molten glass environments, and articles manufactured from the alloy, preferably by casting, are disclosed.

Abstract: Boron-containing transition metal alloys based on one or more of iron, cobalt and nickel, and containing at least two metal components, are characterized by being composed of ultrafine grains of a primary solid-solution phase randomly interspersed with particles of complex borides which are predominantly located at the junctions of at least three grains of the primary solid-solution phase. These alloys are obtained by devitrification of the solid, amorphous state under specific heat-treatment conditions. These alloys can be consolidated into three-dimensional bodies.