Alloy for a fiber-forming plate

Abstract

The present invention relates to a metal alloy for use at very high temperatures, in particular a metal alloy that can be used in a process for producing inorganic wool by fiberizing a molten inorganic composition, characterized in that it contains the following elements in the following proportions, expressed as percentages by weight of the alloy: Cr 20% to 35%, Fe 0% to 6%, W 3% to 8%, Nb 0.5% to 3%, Ti 0% to 1%, C 0.4% to 1%, Co less than 3% Si less than 1.5% Mn less than 1% The remainder consists of nickel and unavoidable impurities.

Description

Technical Field

[0001] The present invention relates to metal alloys for use at very high temperatures, and in particular to metal alloys that can be used in a process for producing mineral wool by fiberizing a molten inorganic composition, and more generally to metal alloys for forming tools having mechanical strength at high temperatures under oxidizing conditions, such as in molten glass, and also to nickel-based alloys that can be used at high temperatures, and in particular to nickel-based alloys that can be used at high temperatures for manufacturing components of machines for producing glass or other inorganic materials, such as for producing mineral wool, for the smelting and / or high-temperature conversion of glass or other inorganic materials, and for manufacturing shaped articles for the same.

Background Art

[0002] One fiberization technique, known as internal centrifugation, consists of continuously dropping liquid glass inside an assembly of asymmetric parts rotating at a very high rotational speed around a vertical axis. One main part, known as a "spinner", is pierced with holes and has a wall referred to as a "band" that receives the glass, and the glass passes through these holes under the influence of centrifugal force and exits from all parts in the form of molten filaments. An annular burner located above the outside of the spinner generates a downward gas flow that closely surrounds the outer wall of the band, deflecting and drawing these filaments downward. The filaments described above then "solidify" in the form of glass wool.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The spinner is a fiberizing tool (fiberizing tool) that is subject to high loads thermally (thermal shock during start and stop operations and during the establishment of temperature gradients along the components during stable use), mechanically (centrifugal force, corrosion due to the passage of glass), and chemically (oxidation and corrosion by molten glass and by the hot gases generated around the spinner from the burner). The main modes of its degradation are high-temperature creep deformation of the vertical walls, the appearance of horizontal or vertical cracks, and wear due to corrosion of the fiberizing orifice, which necessitate a complete replacement of the components. Therefore, their constituent materials need to have resistance over a sufficiently long production time (or fiberizing time) and thus remain compliant with the technical and economic requirements of the process. For this purpose, materials having a certain degree of ductility, creep resistance, as well as resistance to corrosion by molten glass and resistance to oxidation at high temperatures, are required.

[0004] Nickel-based superalloys reinforced by carbide precipitates are known for manufacturing these tools. For example, French Patent Application Publication No. 2675818 describes such alloys. The present invention is further improved and ultimately aims to provide a nickel-based alloy that makes it possible to increase the service life of tools (tools) formed from the above alloys, particularly fiberizing spinners formed from such alloys. Therefore, the alloy according to the present invention has very good properties with respect to creep resistance, resistance to corrosion and / or oxidation, and ultimately makes it possible to obtain an improved service life.

Means for Solving the Problem

[0005] More particularly, the subject of the present invention is an alloy containing the following elements, the proportions being indicated as% by weight of the alloy (including the upper and lower limits): Cr 20% - 35% Fe 0% - 6% W 3% - 8% Nb 0.5% - 3% Ti 0% - 1% C 0.4% - 1% Co 0% to 3% Si 0.1% to 1.5% Mn 0.1% to 1%, The balance consisting of nickel and inevitable impurities.

Embodiments for Carrying Out the Invention

[0006] Regarding the object of the present invention, inevitable impurities mean that the elements in question are introduced in the form of impurities that are not intentionally present in the composition of the alloy, but are present in at least one of the main elements of the alloy (or at least one of the precursors of the above-mentioned main elements).

[0007] The alloy according to the present invention is different from nickel-based alloys generally used for the above applications, in particular in that it contains niobium carbide (NbC) and optional titanium carbide (TiC), and contains a limited amount of iron, or does not contain iron, or contains only iron in the form of inevitable impurities.

[0008] The above-cited French Patent Application Publication No. 2675818 shows that an amount of iron in the range of 7% to 10% is required in nickel-based alloys, thereby improving the resistance to corrosion against molten glass, particularly against sulfur-containing compounds contained in the above molten glass. Unexpectedly, and even contrary to expectations, the properties of the alloy composition according to the present invention, i.e., an alloy composition having a much lower proportion of iron than previously described (or even not having iron, or containing iron only in the form of inevitable impurities), are clearly superior to the properties of the alloys of the prior art, as shown by the description below for the provided examples. In particular, it has been shown that the service life of spinners formed from such alloys is relatively excellent.

[0009] Among the elements forming part of the composition of the alloy, the following can be particularly mentioned (the percentages are all shown relative to the total weight of the alloy): Nickel is the base element of the alloy according to the present invention in that it occupies more than 50% by weight of the alloy. The nickel content is preferably 52% or more, or even more preferably 54% or more. Even more preferably, the nickel content is more than 55%, or even more preferably 56% or more. Even more preferably, the nickel content is 65% or less, or even more preferably 63% or less, or even more preferably 62% or less. The alloy can very preferably contain nickel between 55.5% and 60% by weight, or even more preferably between 56% and 60% by weight.

[0010] Carbon is an essential component of the alloy and is necessary for the formation of precipitates of metal carbides. In particular, the carbon content directly determines the amount of carbide present in the alloy. This is at least 0.4% by weight, whereby a desired minimum reinforcement is obtained, preferably at least 0.5% by weight, but is preferably limited to a maximum of 1% by weight, preferably a maximum of 0.9% by weight, or even more preferably a maximum of 0.8% by weight, thereby preventing the alloy from becoming rigid and difficult to machine due to an overly high density of reinforcement. The lack of ductility of the alloy at such a content makes it difficult to accommodate (e.g., due to heat) externally imposed deformations without cracking and to have sufficient resistance to crack propagation. The alloy can very preferably contain carbon in the range between 0.6% and 0.7% by weight. Most particularly, the alloy according to the present invention, which has shown very good performance in the above sense, contains carbon between 0.55% and 1% by weight.

[0011] Chromium contributes to the inherent mechanical strength of the matrix and is present partially in solid solution in the matrix and, in some cases, in fine dispersions within the grains, essentially in the form of Cr 23 It is also present in the form of C6 type carbides, which provide resistance to intergranular creep, or Cr7C3 or Cr at the grain boundaries 23It exists in the form of carbides of C6, which prevents intergranular sliding and thus also contributes to the intergranular strengthening of the alloy. Chromium contributes to corrosion resistance as a precursor of chromium oxide, and the chromium oxide forms a protective layer on the surface exposed to the oxidizing environment. Therefore, a minimum amount of chromium is required for the formation and maintenance of this protective layer. However, an excessively high chromium content has an adverse effect on mechanical strength and toughness at high temperatures because it results in excessive rigidity that does not conform to high-temperature stress and excessively low extensibility under excessive stress. Preferably, the chromium content of the alloy that can be used according to the present invention is 22% or more, or further 25% or more, or further 28% or more. Preferably, the chromium content of the alloy that can be used according to the present invention is 32% or less, or further 30% or less.

[0012] The alloy can very preferably contain chromium between 28% by weight and 30% by weight.

[0013] According to experiments conducted by the applicant's company, similar to titanium, niobium clearly contributes to the mechanical strength of the alloy, and in particular, at high temperatures, for example, at temperatures above 1000 °C, or further above 1040 °C, it contributes to creep resistance. This is because chromium carbide (chromium carbide) has a tendency to decompose at temperatures above 1000 °C. Niobium carbide (niobium carbide) and titanium carbide (titanium carbide) are more stable than chromium carbide at high temperatures, and the presence of these enables the mechanical strength of the alloy at high temperatures to be ensured. Furthermore, the movement of chromium on the surface to form the protective chromium layer required for corrosion resistance induces a local decrease in chromium under the surface, and thus results in the disappearance of Cr7C3 carbide and Cr 23 C6 carbide. The presence of NbC carbide contributes to maintaining mechanical properties during the disappearance of chromium carbide. The niobium content is preferably 0.6% or more, or further 0.7% or more. More preferably, the niobium content is 2.5% or less, or further 2% or less, or further 1.5% or less, and very preferably less than 1.2%, or further less than 1.15%.

[0014] The alloy very preferably contains niobium in the range between 0.8% by weight and 1.2% by weight.

[0015] A certain proportion of the titanium can also contribute to the mechanical strength of the alloy at high temperatures by forming titanium carbide. However, the presence of titanium can affect the oxidation resistance of the alloy. Therefore, the titanium content is preferably less than 0.5% by weight, or even less than 0.4% by weight. In a particularly preferred embodiment, the alloy does not contain titanium except in the form of inevitable impurities, that is, it contains titanium in a content of less than 0.1% by weight, or even less than 0.05% by weight, or even less than 0.01% by weight with respect to the alloy.

[0016] The (Nb + Ti) / C weight ratio according to the present invention is preferably between 1 and 2, more preferably between 1.5 and 2. The (Nb + Ti) / C weight ratio according to the present invention is particularly between 1.5 and 2.4.

[0017] Tungsten is also present in the alloy and contributes to the rigidity of the alloy and the creep resistance of the alloy together with the other metals described above.

[0018] Tungsten is present in the alloy in an amount of 3% by weight or more, more preferably 4% by weight or more, or even 5% by weight or more. Tungsten is preferably present in the alloy in an amount of 7% by weight or less, more preferably 6% by weight or less.

[0019] The alloy can contain, for example, 3% to 8% by weight, 4% to 7% by weight, very preferably between 5% and 6% by weight of tungsten.

[0020] Cobalt can exist in the alloy in the form of a solid solution with nickel. This is very commonly used in the field of high-temperature refractory steels in refractory alloys because such solid solutions are known to contribute to the corrosion resistance and mechanical strength of the overall alloy. However, since cobalt is an expensive element, it is intentionally limited in the present invention and is present in the alloy in an amount of less than 3% by weight, or even less than 2% by weight, or even less than 1% by weight. In the field of refractory alloys containing nickel, the presence of a sufficient amount of cobalt is considered a requirement for stabilizing such refractory alloys. Surprisingly, in the case of the specific alloys that are the subject of the present invention, it has been found by the applicant's company that it is possible to limit its presence as much as possible, particularly to its presence only in the form of inevitable impurities. Most commonly, tests conducted by the applicant have shown that, nevertheless, cobalt is substantially always present in the alloy in the form of inevitable impurities in an amount of at least 0.3% by weight, most commonly at least 0.5% by weight, or even at least 0.7% by weight. However, with respect to the present invention, the presence of less than 0.3% by weight of cobalt in the alloy, or even the presence of cobalt below the detection limit, is also considered to be included.

[0021] As described above, the amount of iron, which was considered an essential element in the prior art document, French Patent Application Publication No. 2675818, is also limited in the present invention. The iron content is preferably 5% or less, or even 4.5% or less, or even 4% or less.

[0022] According to an embodiment of the present invention, the iron content is 1% or more, or even 2% or more, or even 3% or more. According to another embodiment of the present invention, iron can exist only in the form of inevitable impurities.

[0023] According to another possible embodiment, the iron content is between 4% by weight and 6% by weight.

[0024] The alloy may advantageously contain other elements in very small proportions.

[0025] The alloy contains in particular: - silicon, in an amount preferably less than 1.1% by weight, or even less than 0.9% by weight, or even less than 0.8% by weight, as a deoxidizer for the molten metal during the smelting and shaping of the alloy, - manganese, in an amount preferably less than 0.9% by weight, or even less than 0.6% by weight, also as a deoxidizer.

[0026] The total amount of other elements ( "unavoidable impurities") introduced as impurities together with the essential components of the alloy is advantageously less than 2% by weight of the composition of the alloy, or even less than 1% by weight of the alloy.

[0027] Among the possible conventional unavoidable impurities, mention can be made of sulfur and phosphorus. Their individual amounts generally do not exceed 0.05% in the alloys according to the invention.

[0028] The alloy according to the invention also differs from certain nickel-based alloys commonly used for the manufacture of fiberizing spinners in that it does not contain aluminum except in the form of unavoidable impurities, i.e. it contains aluminum in a content of less than 0.1% by weight, less than 0.05% by weight, or even less than 0.01% by weight. This is because the presence of aluminum in the alloy can substantially affect its corrosion resistance to molten glass even in small amounts of about 0.1% by weight.

[0029] The alloy according to the invention also does not contain molybdenum except in the form of impurities, i.e. it may contain molybdenum in a content of less than 0.1% by weight, or even less than 0.05% by weight, or even less than 0.01% by weight. This is because although molybdenum is known to provide nickel-based alloys with excellent corrosion resistance, it has been observed that molybdenum can greatly affect the alloy's resistance to oxidation even in small amounts.

[0030] In certain embodiments, the alloy according to the present invention contains, by weight percentage: Cr 22% - 31%, preferably 28% - 30% Fe 0% - 6%, preferably 3% - 4% W 4% - 7%, preferably 5% - 6% Nb 0.5% - 3%, preferably 0.8% - 1.2% Ti 0% - 0.5%, preferably 0.1% - 0.3% C 0.45% - 0.9%, preferably 0.6% - 0.7% Co less than 3%, preferably less than 1% Si less than 1.1%, preferably 0.6% - 0.8% Mn less than 0.8%, preferably 0.5% - 0.7% The balance consisting of nickel and unavoidable impurities. In particular, nickel can be present, advantageously, in an amount in the range of 54% to 62% by weight, in particular in a content in the range of 55% to 60% by weight.

[0031] The alloy that can be used according to the present invention contains highly active elements and can be shaped by casting, in particular by induction melting and sand casting under at least a partially inert atmosphere.

[0032] After casting, optionally, heat treatment can be carried out.

[0033] Another subject of the present invention is a method for manufacturing a molded article by casting using the alloy described above as the subject of the present invention.

[0034] This method generally includes an appropriate heat treatment step, which, as described in French Patent Application Publication No. 2675818, enables the obtaining of secondary carbides (secondary carbides) and their uniform distribution in the metal matrix. The heat treatment is preferably carried out at a temperature of less than 1000 °C, or even less than 950 °C, for example from 800 °C to 900 °C, for at least 5 hours, or even at least 8 hours, for example from 10 hours to 20 hours.

[0035] This method can include at least one cooling stage (cooling step) after casting and / or after or during the heat treatment. For example, it can include a cooling stage by cooling in air, particularly a cooling stage involving returning to ambient temperature.

[0036] The alloy which is the subject of the present invention can be used for manufacturing all kinds of parts that are mechanically stressed at high temperatures and / or operate in an oxidizing or corrosive environment. Another subject of the present invention is a shaped article as described above, manufactured from the alloy according to the present invention, particularly by casting.

[0037] Among such uses, particular mention can be made of the manufacture of shaped articles that can be used for the smelting of glass or the high-temperature conversion of glass, for example the manufacture of a fiberizing spinner for manufacturing mineral wool.

[0038] Therefore, another subject of the present invention is a method for manufacturing mineral wool by internal centrifugation, in which a stream of molten inorganic material is poured into a fiberizing spinner, the peripheral band of the fiberizing spinner is perforated with a plurality of orifices, through which filaments of the molten inorganic material emerge and are then drawn under the action of a gas to produce wool, and the temperature of the inorganic material in the spinner is at least 900 °C, or even at least 950 or at least 1000 °C, or even at least 1040 °C, and this fiberizing spinner is made of the above-described alloy.

[0039] Therefore, the alloy according to the present invention has a liquidus temperature (T 液相 , or T liq ) ranging from 800 °C or higher, for example, 850 °C (or even 900 °C) to 1030 °C (or even 1000 °C or even 950 °C), and can fiberize a molten inorganic material having the same.

[0040] The composition of the inorganic material to be fiberized is not particularly limited as long as it can be fiberized by the internal centrifugal method. It may be various depending on the properties desired for the inorganic fibers to be produced, and may be various, for example, depending on biodegradability, fire resistance, or heat insulation properties. The material to be fiberized is preferably a soda lime silica borate type glass composition. In particular, the material to be fiberized can have a composition having the following components in the weight ratios defined by the following limitations: SiO2 35% - 80% Al2O3 0% - 30% CaO + MgO 2% - 35% Na2O + K2O 0% - 20%, Generally, it is understood that SiO2 + Al2O3 is in the range of 50% to 80% by weight, and Na2O + K2O + B2O3 is in the range of 5% to 30% by weight.

[0041] In particular, the material to be fiberized can have the following composition in weight percentages: SiO2 50% - 75% Al2O3 0% - 8% CaO + MgO 2% - 20% Fe2O3 0% - 3% Na2O + K2O 12% - 20%, B2O3 2% - 10%.

[0042] The material to be fiberized can be prepared from pure components, but generally, it is obtained by melting a mixture of natural starting materials that provide different impurities.

[0043] Although the present invention has been mainly described with respect to the production of mineral wool, it can be applied to the glass industry as a whole, particularly for the production of furnace, bushing, or feeder components or accessories, and in particular for the production of textile glass threads, packaging glass, and the like.

[0044] In addition to the glass industry, the present invention can be applied to the production of a very wide range of shaped articles when the shaped articles need to have high mechanical strength in an oxidizing and / or corrosive environment, particularly at high temperatures.

[0045] The following examples illustrate the advantages of the present invention. The following examples do not limit in any way the composition according to the present invention or the conditions for using the fiberizing spinner according to the present invention.

Examples

[0046] The molten charges of composition I1 (according to the present invention) and C1 (according to French Patent Application Publication No. 2675818) shown in Table 1 were prepared by induction melting under an inert atmosphere (particularly argon), and then the molten charges were molded by simple casting in a sand mold. Table 1 shows the proportion of each element in the alloy in weight percent, and the remainder up to 100% consists of nickel and unavoidable impurities.

[0047]

Table 1

[0048] After casting, a heat treatment for the precipitation of secondary carbides was carried out at 865 °C for 12 hours and ended with air cooling to ambient temperature.

[0049] In this way, ingots of 200×110×25 mm were produced.

[0050] Thereafter, the creep resistance, oxidation resistance, and corrosion resistance properties of alloys I1 and C1 were evaluated.

[0051] The creep resistance was measured by a creep tension test on test specimens 30.0 mm in length, 8.0 mm in width, and 2.0 mm in thickness. The tests were carried out at 1000 °C (the normal operating temperature of the spinner), under loads of 45 MPa (corresponding to the normal stress of the spinner), 63 MPa (corresponding to the extreme stress of the spinner), and 100 MPa. Table 2 shows the creep rate (in the second mode) in μm / h.

[0052] The oxidation resistance depends, on the one hand, on the kinetics of oxidation of the alloy and, on the other hand, on the quality of adhesion of the oxide layer formed on the surface of the alloy. This is because poor adhesion of the oxide layer to the surface of the alloy promotes oxidation of the alloy. When the oxide layer flakes off, the unoxidized alloy surface is directly exposed to the oxygen in the air, which in turn leads to the formation of a new oxide layer that can flake off, and thus oxidation propagates. On the other hand, when the oxide layer remains adhered to the surface of the alloy, it forms a barrier layer that limits and even stops the progress of oxidation. The oxidation rate constant Kp, expressed in g·cm -2 ·s -1 / 2 was calculated by measuring the weight increase resulting from the oxidation of specimens placed in a furnace equipped with a microbalance under an air flow at 1000 °C for 50 hours. Table 2 shows these constants in g·cm -2 ·s -1 / 2 units.

[0053] The corrosion resistance test is carried out using a three - electrode assembly. This electrode is immersed in a rhodium / platinum crucible having molten glass. The rhodium / platinum crucible is used as the counter electrode. The reference electrode is customarily an air - filled stabilized zirconia electrode. A cylindrical sample of the alloy heat - treated at 1000 °C for 2 hours in air, which is the object of evaluation, is sealed with alumina covering using zirconia cement to form the working electrode. The sample constituting the working electrode is attached to a rotating shaft, thereby imparting friction of the glass on the surface of the alloy, and immersed in molten glass (composition as weight ratio: SiO2 65.6; Al2O3 1.7; Na2O 16.4; K2O 0.7; CaO 7.4; MgO 3.1; B2O3 4.8) at 1000 °C. The resistance of the alloy to corrosion by the glass was evaluated by measuring the polarization resistance (Rp). To measure the corrosion potential (Ec), no current is applied between the working electrode and the counter electrode, and the potential measured between the working electrode and the reference electrode is the metal / glass potential at a given temperature. This thermodynamic information makes it possible to determine the corrosion reaction and passivation properties of the metal under investigation. The measured value of the polarization resistance (Rp) was obtained by periodically changing the potential in the vicinity of the potential Ec and measuring the resulting change in the current density. The slope of the current / potential curve recorded over this range is inversely proportional to Rp. (Expressed in Ohm.cm 2 ). The larger Rp is, the higher the resistance of the material to corrosion, and the degradation rate is inversely proportional to Rp. Therefore, the determination of Rp makes it possible to evaluate the corrosion rate of the alloy by comparison.

[0054]

Table 2

[0055] Comparing the data shown in Table 2, for alloy I1 according to the present invention, substantially improved creep resistance as compared with alloy C1, and substantially equivalent corrosion resistance and oxidation resistance as compared with alloy C1 are confirmed. Further, the stability of NbC carbide during the chromium migration process enables maintaining the mechanical properties required for good resistance of the material, and is fully understood when analyzing the results of the application of this alloy to a fiberizing spinner.

[0056] Thereafter, using alloy C1 according to the prior art and alloy I1 according to the present invention, a plurality of fiberizing spinners with diameters of 400 mm and 600 mm respectively are formed. Under an inert argon atmosphere, the spinners are prepared by induction melting technology: a molten charge of the selected composition (i.e., I1 or C1, see Table 1 above) is prepared, and then this molten charge is formed by simple casting in a sand mold.

[0057] After casting, a heat treatment is performed at 865 °C for 12 hours for the precipitation of secondary carbides. After this treatment, rapid cooling is performed by spraying air.

[0058] In this way, a series of fiberizing spinners with diameters of 400 mm and 600 mm are manufactured in two alloys.

[0059] The performance of the spinners thus formed was evaluated in the application of glass wool fiberization. More specifically, these spinners were placed on an industrial line for fiberizing glass of the following composition (in weight percent):

[0060]

Table 3

[0061] This is a glass having a liquidus temperature of 900 °C.

[0062] Use the spinner until it stops upon destruction of the spinner. Destruction of the spinner is observed by visible deterioration of the spinner or by insufficient quality of the fibers being produced.

[0063] The service life of the spinner is shown in Table 1. The results are shown as tons of material fibrillated before the spinner breaks. The results shown in Table 3 are average values obtained over at least three spinners for each category.

[0064] [Table 4]

[0065] As can be seen in Table 3, spinners made of the alloy according to the present invention always have the longest service life under comparable use conditions. The present disclosure includes the following aspects: <Aspect 1> An alloy, characterized by containing the following elements in the following proportions (including upper and lower limits) expressed as weight percentages of the alloy: Cr 20%~35%、 Fe 0% to 6%, W 3%~8%、 Nb 0.5% to 3%, Ti 0% to 1%, C 0.4%~1%、 Co 0% to 3%, Si 0.1% to 1.5% Mn 0.1% to 1%, The balance consists of nickel and unavoidable impurities. <Aspect 2> The alloy according to Aspect 1, characterized by containing less than 0.5% by weight of Ti, preferably less than 0.4% by weight of Ti. <Aspect 3> The alloy according to Aspect 1 or 2, characterized by containing 0.6% to 0.9% by weight of carbon, preferably 0.6% to 0.7% by weight of carbon. <Aspect 4> The alloy according to any one of Aspects 1 to 3, characterized in that the (Nb + Ti) / C ratio is 1 to 2, preferably 1.5 to 2. <Aspect 5> The alloy according to any one of Aspects 1 to 4, characterized by containing chromium between 22% and 32% by weight, preferably between 28% and 30% by weight. <Aspect 6> The alloy according to any one of Aspects 1 to 5, characterized by containing iron between 3% and 4% by weight. <Aspect 7> The alloy according to any one of Aspects 1 to 6, characterized by containing iron between 4% and 6% by weight. <Aspect 8> The alloy according to any one of Aspects 1 to 7, characterized by containing niobium from 0.6% to 2.0% by weight, preferably 0.8% to 1.2% by weight. <Aspect 9> The alloy according to any one of Aspects 1 to 8, characterized by containing tungsten between 4% and 7% by weight, preferably between 5% and 6% by weight. <Aspect 10> The alloy according to any one of Aspects 1 to 9, characterized by containing less than 2% by weight of cobalt, preferably less than 1% by weight of cobalt. <Aspect 11> The alloy according to any one of Aspects 1 to 10, characterized by containing nickel between 55% and 65% by weight, preferably between 56% and 62% by weight. <Aspect 12> The alloy according to any one of Aspects 1 to 11, characterized by containing less than 1.1% by weight of silicon. <Aspect 13> A shaped article for glass conversion, made from the alloy according to any one of Aspects 1 to 12, particularly by casting. <Aspect 14> In particular, by casting, a shaped article for the production of mineral wool made from the alloy according to any one of aspects 1 to 13. <Aspect 15> In particular, by casting, a fiberizing spinner for the production of mineral wool made from the alloy according to any one of aspects 1 to 12. <Aspect 16> A method for producing mineral wool by internal centrifugation, pouring a stream of molten inorganic material into the fiberizing spinner according to aspect 15, the peripheral band of the fiberizing spinner being perforated with a plurality of orifices, drawing filaments of the molten inorganic material out through these orifices and then, under the action of a gas, drawing to produce wool, the temperature of the inorganic material in the spinner being at least 1000 °C, method.

Claims

1. An alloy, characterized in that it contains the following elements in the following proportions (including upper and lower limits) expressed as weight percentages of the alloy: Cr 20% to 35%, Fe 3% to 6%, W 3% to 8%, Nb 0.5% to 3%, C 0.4% to 1%, Si 0.1% to 1.5% Mn 0.1% to 1%, The balance consists of nickel and unavoidable impurities, the unavoidable impurities include Ti and Co, the proportion of Ti is less than 0.3%, and the proportion of Co is 0.3% or more and 3% or less.

2. The alloy according to claim 1, characterized in that it contains 0.6% to 0.9% by weight of carbon.

3. The alloy according to claim 1 or 2, characterized in that the (Nb + Ti) / C ratio is 1 to 2.

4. The alloy according to any one of claims 1 to 3, characterized in that it contains 22% to 32% by weight of chromium.

5. The alloy according to any one of claims 1 to 4, characterized in that it contains 3% to 4% by weight of iron.

6. The alloy according to any one of claims 1 to 4, characterized in that it contains 4% to 6% by weight of iron.

7. The alloy according to any one of claims 1 to 6, characterized in that it contains 0.6% to 2.0% by weight of niobium.

8. The alloy according to any one of claims 1 to 7, characterized in that it contains 4% to 7% by weight of tungsten.

9. The alloy according to any one of claims 1 to 8, characterized in that it contains 0.3% to less than 2% by weight of cobalt.

10. The alloy according to any one of claims 1 to 9, characterized in that it contains 55% to 65% by weight of nickel.

11. The alloy according to any one of claims 1 to 10, characterized in that it contains less than 1.1% by weight of silicon.

12. A molded article for converting glass into fibers, made from the alloy according to any one of claims 1 to 11.

13. A molded article for the production of mineral wool, made from the alloy according to any one of claims 1 to 11.

14. A fiberizing spinner for the production of mineral wool, made from the alloy according to any one of claims 1 to 11.

15. A method for producing mineral wool by internal centrifugation, Pour the flow of molten inorganic material into the fiberizing spinner according to claim 14, wherein the peripheral band of the fiberizing spinner is perforated with a plurality of orifices, extrude filaments of the molten inorganic material out through these orifices and then draw them under the action of a gas to produce wool, wherein the temperature of the inorganic material in the spinner is at least 1000 °C, Method.

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