CN104862534A - Nickel-based alloy and preparation method and application thereof - Google Patents

Abstract

The invention discloses a nickel-based alloy and its preparation method and application, and relates to the technical field of corrosion-resistant materials to solve the problem of supercritical equipment caused by Inconel-625 material or Hastelloy C-276 material in an acidic oxidizing medium where various ions coexist The problem of poor corrosion resistance. The nickel-based alloy includes Cr: 15%-28%, Mo: 4%-13%, Ti: 0.5%-1.5%, Cu: 1%-4%, Fe: 6%-15% in mass fraction , C: greater than 0 and less than or equal to 0.03%, trace elements: 0-0.5%, and the balance is Ni. The preparation method of nickel-based alloy is to mix and melt Ni, Cr, Mo, and Fe under vacuum conditions until it is cleared, and then refine. After refining, add Ti and trace elements and stir evenly, then desulfurize, and finally cast to obtain nickel base alloy. The nickel-based alloy can be used as a corrosion-resistant material in supercritical equipment.

Description

A kind of nickel base alloy and its preparation method and application

technical field

The invention relates to the technical field of corrosion-resistant materials, in particular to a nickel-based alloy and its preparation method and application.

Background technique

At present, with the emphasis on environmental protection in various countries, correspondingly higher requirements are put forward for the treatment of industrial wastewater and urban sewage. Supercritical water oxidation treatment technology uses supercritical water as a medium to decompose organic matter contained in wastewater or sewage into simple and non-toxic small molecular compounds such as water and carbon dioxide under high temperature and high pressure conditions. Because supercritical water oxidation treatment technology can remove almost 100% of the organic matter contained in wastewater or sewage, and the organic matter is completely oxidized in a fully enclosed state without secondary pollution. Therefore, this technology has been paid more and more attention by people.

The supercritical water oxidation treatment technology is carried out under the conditions of high temperature and high pressure, which requires particularly high corrosion resistance of supercritical equipment. In addition, because some wastewater or sewage contains various salts and other substances, when the water in the supercritical equipment reaches the supercritical point, the salts contained in the wastewater or sewage will be dissolved in the presence of dissolved oxygen. Corrosion occurs to supercritical equipment, therefore, it is necessary to carry out anti-corrosion treatment on supercritical equipment to improve the corrosion resistance of supercritical equipment.

In order to improve the corrosion resistance of supercritical equipment, Inconel-625 material or Hastelloy C-276 material is usually used for corrosion resistance treatment of heat exchanger and reactor of supercritical equipment; among them, Inconel-625 material has excellent crevice corrosion resistance ability, and has good processability and weldability, and no post-weld cracking susceptibility. Hastelloy C-276 material is mainly resistant to wet chlorine, various oxidizing chlorides, chloride salt solutions, sulfuric acid and oxidizing salts, and has good corrosion resistance in low temperature and medium temperature hydrochloric acid. However, the research found that Inconel-625 material or Hastelloy C-276 material often has a variety of corrosion phenomena in the acidic oxidizing medium where various ions coexist, resulting in poor corrosion resistance of supercritical equipment.

Contents of the invention

The object of the present invention is to provide a kind of nickel base alloy and its preparation method and application, to solve existing Inconel-625 material or Hastelloy C-276 material in the acidic oxidizing medium that multiple ions coexist, cause the resistance of supercritical equipment The problem of poor corrosion ability.

In order to achieve the above object, the present invention provides the following technical solutions:

A nickel-based alloy, by mass fraction, including 15%-28% of Cr, 4%-13% of Mo, 0.5%-1.5% of Ti, and 1% by mass fraction -4% Cu, mass fraction 6%-15% Fe, mass fraction greater than 0 and less than or equal to 0.03% C, mass fraction 0-0.5% trace elements, the balance being Ni.

Preferably, the nickel-based alloy includes Cr with a mass fraction of 17.5%-25%, Mo with a mass fraction of 4%-10%, Ti with a mass fraction of 0.55%-1.0%, and a mass fraction of 2%-3.5% Cu, the mass fraction is 7%-14% Fe, the mass fraction is greater than 0 and less than or equal to 0.02% C, the mass fraction is 0-0.3% trace elements, and the balance is Ni.

Preferably, the nickel-based alloy includes Cr with a mass fraction of 16.8%-24.5%, Mo with a mass fraction of 5.8%-10.5%, Ti with a mass fraction of 0.6%-1.0%, and a mass fraction of 2%-3%. The mass fraction of Cu is 7%-13%, the mass fraction of C is greater than 0 and less than or equal to 0.01%, the mass fraction of trace elements is 0-0.3%, and the balance is Ni.

Preferably, the nickel-based alloy includes Cr with a mass fraction of 16%-20%, Mo with a mass fraction of 5%-10%, Ti with a mass fraction of 0.6%-1.0%, and a mass fraction of 2%-4%. Cu, the mass fraction is 7.5%-12.5% Fe, the mass fraction is greater than 0 and less than or equal to 0.01% C, the mass fraction is 0-0.5% trace elements, and the balance is Ni.

Preferably, the trace elements include one or more of W, Al, Mn, V, Nb, Co, B.

Preferably, in the nickel-based alloy,

The mass fraction of W is greater than 0 and less than or equal to 0.5%; and/or

The mass fraction of Al is greater than 0 and less than or equal to 0.4%; and/or

The mass fraction of Mn is greater than 0 and less than or equal to 0.4%; and/or

The mass fraction of V is greater than 0 and less than or equal to 0.4%; and/or

The mass fraction of said Nb is greater than 0 and less than or equal to 0.5%; and/or

The mass fraction of Co is greater than 0 and less than or equal to 0.3%; and/or

The mass fraction of B is greater than 0 and less than or equal to 0.006%.

The present invention also provides a method for preparing a nickel-based alloy, comprising the following steps:

Step 1, taking Ni, Cr, Mo, Fe, Ti, Cu and trace elements respectively, wherein, in terms of mass percentage, the mass fraction of Cr is 15%-28%, and the mass percentage of Mo is 4%-13%, The mass percentage of Ti is 0.5%-1.5%, the mass percentage of Cu is 1%-4%, the mass percentage of Fe is 6%-15%, and the mass percentage of trace elements is 0-0.5%; Ni, Cr, Mo, The mass percentage of C substituted in Fe, Ti, Cu and trace elements is greater than 0 and less than or equal to 0.03%, and the balance is Ni;

Step 2, Ni, Cr, Mo, Fe are mixed and melted under vacuum conditions until they are cleared, and the molten metal liquid after clearing is obtained;

Step 3: Refining the melted molten metal after refining, and cooling down until the surface of the obtained refining liquid freezes conjunctiva;

Step 4, blowing protective gas into the refining liquid whose surface is frozen conjunctiva, then heating to make the refining liquid melt uniformly, adding Ti, Cu and trace elements and stirring evenly to obtain alloy liquid;

Step 5: adding a desulfurizing agent to the alloy liquid, then vacuuming, keeping warm under vacuum conditions to desulfurize the alloy liquid, and finally casting to obtain a nickel-based alloy.

Preferably, during refining in step 3, the refining temperature is 1450°C-1500°C, and the refining time is 17 minutes-23 minutes. In step 5, before adding the desulfurizer, the temperature of the alloy liquid is controlled at 1380-1390°C.

The invention also provides an application of the nickel-based alloy as a corrosion-resistant material in supercritical equipment.

Compared with the prior art, the present invention has the following beneficial effects:

The nickel base alloy of the present invention includes Cr with a mass fraction of 15%-28%, Mo with a mass fraction of 4%-13%, Ti with a mass fraction of 0.5%-1.5%, and Ti with a mass fraction of 1%-4 % Cu, mass fraction of 6%-15% Fe, in this content, Cr in the nickel-based alloy can cause lattice distortion of the austenite matrix, reduce the solid solution stacking fault energy, and at the same time The matrix plays a role of solid solution strengthening, which makes the austenite solid solution in the nickel-based alloy have high strength; moreover, Cr in the nickel-based alloy can form a dense passive Cr ₂ O ₃ oxide film at high temperature, making the nickel-based alloy The alloy has good oxidation resistance and thermal corrosion resistance under high temperature conditions; Mo in nickel-based alloys has good corrosion resistance to acidic environments, making nickel-based alloys have good corrosion resistance in supercritical water under acidic conditions ; and Ti is a constituent element that forms a strengthening phase in nickel-based alloys. Part of Ti enters the γ solid solution of nickel-based alloys, which plays a role in solid solution strengthening of nickel-based alloys, and another part of Ti enters γ′ of nickel-based alloys. In the phase, the strength of the nickel-based alloy is further improved by precipitation strengthening of the nickel-based alloy; in addition, Cu can significantly improve the corrosion resistance of Ni in non-oxidizing acid and the stability against stress corrosion, and, because of this The nickel-based alloy provided by the invention belongs to the Ni-Cr-Fe alloy, and containing 1%-4% of Cu can produce aging strengthening effect, thereby improving the strength of the nickel-based alloy.

It can be seen from the above analysis that the present invention optimizes the chemical components in the nickel-based alloy, so that the nickel-based alloy not only has good corrosion resistance in oxidizing media, but also has better strength, and can be used in acidic conditions. maintain good corrosion resistance, so that the corrosion rate of the nickel-based alloy is greatly reduced in the acidic oxidizing medium where multiple ions coexist, thereby ensuring that the nickel-based alloy provided by the invention is used as a corrosion-resistant material for supercritical equipment. Improve the anti-corrosion ability of supercritical equipment, so that supercritical equipment can operate safely.

Detailed ways

The invention provides a nickel-based alloy, the chemical composition of which includes Ni, Cr, Mo, Ti, Cu, Fe, trace elements for adjusting the properties of the nickel-based alloy, and Ni, Cr, Mo, Ti, C introduced by Cu, Fe and trace elements; and in terms of mass fraction, the mass fraction of Cr in the nickel-based alloy is 15%-28%, the mass fraction of Mo is 4%-13%, and the mass fraction of Ti is 0.5% -1.5%, the mass fraction of Cu is 1%-4%, the mass fraction of Fe is 6%-15%, the mass fraction of C is greater than 0 and less than or equal to 0.03%, the mass fraction of trace elements is 0-0.5%, and the rest The amount is Ni.

The invention solves the problem of existing Inconel-625 material or Hastelloy C-276 material in the acidic oxidizing medium where various ions coexist by optimizing the combination of each chemical component in the nickel-based alloy and controlling the content of each chemical component at the same time. Among them, the corrosion resistance of supercritical equipment is poor, and the specific reasons are as follows:

The present invention uses Ni as the matrix element, and Ni can dissolve more alloying elements for alloying, while still maintaining the stability of the austenite phase, so that after alloying with other alloying elements, it can form austenite The body is the nickel base alloy of the matrix.

In the nickel-based alloy provided by the present invention, the contained Cr can cause the lattice distortion of the austenite matrix, reduce the solid solution stacking fault energy, and at the same time play a solid solution strengthening effect on the austenite matrix, so that the The strength of austenitic solid solution is high.

In the nickel-based alloy provided by the present invention, the contained Cr can improve the corrosion resistance of Ni in oxidizing medium under high temperature conditions. The oxidizing medium includes oxidizing acid, oxidizing acid salt or oxidizing basic salt, but not only limited to this. Among them, Cr can form a dense passive Cr ₂ O ₃ oxide film at high temperature, so that the nickel-based alloy has good oxidation resistance and hot corrosion resistance at high temperature, and because the nickel-based alloy has good corrosion resistance at high temperature Oxidation resistance and thermal corrosion resistance Therefore, the nickel-based alloy provided by the present invention can be used as a corrosion-resistant material in supercritical equipment to improve the corrosion resistance of supercritical equipment.

The present invention improves the corrosion resistance of the nickel-based alloy by controlling the Cr content, and, in different environments, the critical Cr content for improving the corrosion resistance of the Ni-Cr alloy is different, therefore, the factors to be considered when determining the Cr content Factors also include the interaction of Ni and Cr, the process is very complicated, and it cannot be determined simply by a limited number of experiments.

Mo in the nickel-based alloy provided by the invention has good corrosion resistance to acidic environments, and can improve the corrosion resistance of the nickel-based alloy under acidic conditions, especially under supercritical water conditions containing hydrochloric acid.

In the nickel-based alloy provided by the present invention, Ti can form a constituent element of the strengthening phase in the nickel-based alloy, part of Ti enters the γ solid solution of the nickel-based alloy, plays a solid solution strengthening effect on the nickel-based alloy, and part of the titanium atoms enters the nickel-based alloy The γ′ phase in the nickel-based alloy is precipitated and strengthened.

The nickel-based alloy provided by the present invention contains 1%-4% Cu, because the nickel-based alloy provided by the present invention belongs to Ni-Cr-Fe alloy, therefore, Cu can significantly improve the corrosion resistance of Ni in non-oxidizing acid Performance and stability against stress corrosion, it can produce aging strengthening effect, thereby improving the strength of nickel-based alloys.

The nickel-based alloy provided by the invention also uses relatively low-cost Fe, which reduces the cost of the nickel-based alloy.

It can be seen from the above analysis that the present invention optimizes the chemical components in the nickel-based alloy, so that the nickel-based alloy not only has good corrosion resistance in the oxidizing medium under high temperature environment, but also has better strength, It can maintain good corrosion resistance under acidic conditions, so that the corrosion rate of the nickel-based alloy is greatly reduced in the acidic oxidizing medium where various ions coexist, thereby ensuring that the nickel-based alloy provided by the invention is used as a corrosion-resistant material in super When critical equipment is used, supercritical equipment can operate safely. At the same time, the present invention strictly limits the addition amount of each chemical component to maximize the synergistic effect of each chemical component, thereby improving the strength and corrosion resistance of the nickel-based alloy.

In order to improve the mechanical strength of the nickel-based alloy, the nickel-based alloy of the present invention comprises Cr of 17.5%-25% by mass fraction, Mo of 4%-10% by mass fraction, Ti of 0.55%-1.0% by mass fraction, mass fraction The fraction is 2%-3.5% Cu, the mass fraction is 7%-14% Fe, the mass fraction is greater than 0 and less than or equal to 0.02% C, the mass fraction is 0-0.3% trace elements, and the balance is Ni.

In order to maintain the stable phase in the nickel-based alloy, the nickel-based alloy of the present invention includes Cr with a mass fraction of 16.8%-24.5%, Mo with a mass fraction of 5.8%-10.5%, Ti with a mass fraction of 0.6%-1.0%, The mass fraction is 2%-3% Cu, the mass fraction is 7%-13% Fe, the mass fraction of C is greater than 0 and less than or equal to 0.01%, the mass fraction of trace elements is 0-0.3%, and the balance is Ni.

In order to further reduce the cost, the nickel-based alloy of the present invention comprises Cr of 16%-20% by mass fraction, Mo of 5%-10% by mass fraction, Ti of 0.6%-1.0% by mass fraction, and 2% by mass fraction -4% Cu, mass fraction 7.5%-12.5% Fe, mass fraction greater than 0 and less than or equal to 0.01% C, mass fraction 0-0.5% trace elements, the balance being Ni.

When the mass percentage of trace elements in the nickel-based alloy provided by the present invention is 0, that is, no trace elements are added in the nickel-based alloy, at this time, in terms of mass fraction, the mass fraction of Cr in the nickel-based alloy is 15%-28%, The mass fraction of Mo is 4%-13%, the mass fraction of Ti is 0.5%-1.5%, the mass fraction of Cu is 1%-4%, the mass fraction of Fe is 6%-15%, and the mass fraction of C is more than 0 is less than or equal to 0.03%, and the balance is Ni.

When the mass percentage of trace elements in the nickel-based alloy provided by the present invention is greater than 0 and less than or equal to 0.5%, that is, the nickel-based alloy contains trace elements. At this time, in terms of mass fraction, the mass fraction of Cr in the nickel-based alloy is 15%-28 %, the mass fraction of Mo is 4%-13%, the mass fraction of Ti is 0.5%-1.5%, the mass fraction of Cu is 1%-4%, the mass fraction of Fe is 6%-15%, and the mass fraction of C is greater than 0 and less than or equal to 0.03%, the mass fraction of trace elements is greater than 0 and less than or equal to 0.5%, and the balance is Ni.

Further, the trace elements include one or more of W, Al, Mn, V, Nb, Co, and B.

In nickel-based alloys, W is used to increase the thermal stability and wear resistance of nickel-based alloys, and its mass fraction is greater than 0 and less than or equal to 0.5%, preferably greater than 0 and less than or equal to 0.3%, more preferably greater than 0 and less than or equal to 0.1%; and /or

Al plays solid solution strengthening and precipitation strengthening effects on nickel-based alloys, and its mass fraction is greater than 0 and less than or equal to 0.4%, preferably greater than 0 and less than 0.2%, more preferably greater than 0 and less than or equal to 0.1%; and/or

Mn is used to stabilize the structure of the austenite matrix in nickel-based alloys and increase the hardenability of nickel-based alloys. Its mass fraction is greater than 0 and less than or equal to 0.4%, preferably greater than 0 and less than or equal to 0.3%, and more preferably greater than 0 and less than or equal to 0.15%. ;and / or

V is used to refine the structure and grain size of the nickel-based alloy, and its mass fraction is greater than 0 and less than or equal to 0.4%, preferably greater than 0 and less than or equal to 0.35%, more preferably greater than 0 and less than or equal to 0.1%; and/or

Nb is used to improve the impact toughness of nickel-based alloys or enhance the hydrogen resistance performance, and its mass fraction is greater than 0 and less than or equal to 0.5%, preferably greater than 0 and less than or equal to 0.4%, more preferably greater than 0 and less than or equal to 0.1%; and/or

Co is used to improve the tensile strength of nickel-based alloys, and its mass fraction is greater than 0 and less than or equal to 0.3%, preferably greater than 0 and less than or equal to 0.2%, more preferably greater than 0 and less than or equal to 0.1%; and/or

B is used to improve the grain boundary strengthening of nickel-based alloys, and its mass fraction is greater than 0 and less than or equal to 0.006%.

Some performance changes brought by these trace elements to nickel-based alloys are related to their own characteristics and will not be repeated here.

Although there is inevitably introduced C in the nickel-based alloy provided by the present invention, and C in the nickel-based alloy can destroy the corrosion resistance of the nickel-based alloy under acidic conditions, and belongs to a harmful component to the nickel-based alloy, it does not mean that, C cannot be introduced. In the nickel-based alloy, when the mass fraction of C is greater than 0 and less than or equal to 0.03%, the strength of the nickel-based alloy can be improved.

It should be noted that in the nickel-based alloy provided by the present invention, the C inevitably introduced, the amount of the introduced amount is controlled by adjusting the amount of Ni, Cr, Mo, Ti, Cu, Fe and trace elements, Therefore, the mass percentages of the chemical components in the nickel-based alloy provided by the present invention are interrelated, and are not randomly selected.

The present invention also provides a method for preparing the above-mentioned nickel-based alloy, comprising the following steps:

Step 1, taking Ni, Cr, Mo, Fe, Ti, Cu and trace elements respectively, wherein, in terms of mass percentage, the mass fraction of Cr is 15%-28%, and the mass percentage of Mo is 4%-13%, The mass percentage of Ti is 0.5%-1.5%, the mass percentage of Cu is 1%-4%, the mass percentage of Fe is 6%-15%, and the mass percentage of trace elements is 0-0.5%; Ni, Cr, Mo, The mass percentage of C inevitably substituted in Fe, Ti, Cu and trace elements is greater than 0 and less than or equal to 0.03%, and the balance is Ni;

Step 2, Ni, Cr, Mo, Fe are mixed and melted under vacuum conditions until they are cleared, and the molten metal liquid after clearing is obtained;

Step 3: Refining the melted molten metal after refining, and cooling down until the surface of the obtained refining liquid freezes conjunctiva;

Step 4, blowing protective gas into the refining liquid whose surface is frozen conjunctiva, then heating to make the refining liquid melt uniformly, adding Ti, Cu and trace elements and stirring evenly to obtain alloy liquid;

Step 5: adding a desulfurizing agent to the alloy liquid, then vacuuming, keeping warm under vacuum conditions to desulfurize the alloy liquid, and finally casting to obtain a nickel-based alloy.

The preparation of nickel-based alloys is done in vacuum induction furnaces, but not limited to vacuum induction furnaces.

Taking the preparation of nickel-based alloys in a vacuum induction furnace as an example, in step 2, Ni, Cr, Mo, and Fe are added to the vacuum induction furnace, vacuumed, and then Ni, Cr, Mo, and Fe are placed under vacuum conditions by controlling the power transmission. Melt down to obtain molten metal; then increase the power transmission until the molten metal is liquefied and cleared to obtain molten metal after clearing.

Preferably, under vacuum conditions, the vacuum degree is less than 10Pa, such as 9.9Pa, 8Pa, 6Pa, 4Pa, 2Pa, 1Pa. Of course, in order to avoid oxidation, the greater the vacuum degree, the better. The purpose of controlling the power transmission is to melt Ni, Cr, Mo, and Fe, which can be selected according to actual needs.

In step 3, refining the melted molten metal, and cooling down until the surface of the obtained refining solution freezes conjunctiva after refining; wherein, during refining, the refining temperature is 1450°C-1500°C, and the refining time is 17 minutes-23 minutes ;The refining temperature is controlled by adjusting the power transmission power; in the later stage of refining, increase the vacuum degree so that the vacuum degree is not greater than 1Pa. Preferably, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 1Pa to reduce oxygen content.

In step 4, the protective gas is preferably argon or nitrogen; its function is to keep the refining liquid with frozen conjunctiva on the surface in a protective gas atmosphere to prevent oxidation. The purpose of heating is to make the refining liquid melt uniformly, and the heating temperature is 1480°C-1490°C, and the heating temperature is also controlled by adjusting the power transmission.

In step five, before adding the desulfurizing agent, the temperature of the alloy liquid is controlled at 1380-1390°C, and the temperature of the alloy liquid can also be controlled by adjusting the power transmission power. The desulfurizing agent is a reducing metal, such as Mg, Al, etc., but Not only that, but other desulfurizers can also be used instead; in addition, when desulfurizing under vacuum conditions, the vacuum degree is less than 5Pa to avoid the existence of oxygen; and the desulfurization time is at least 10 minutes to remove the sulfur in the alloy liquid as much as possible.

The nickel-based alloy provided by the present invention and its preparation method are described in detail below, and the following examples are only explanations of the present invention, not limitations. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Embodiment one:

The nickel-based alloy provided in this embodiment includes Ni, Cr, Mo, Ti, Cu, Fe, and C introduced by Ni, Cr, Mo, Ti, Cu, Fe; wherein, in terms of mass fraction, the nickel-based The mass fraction of Cr in the alloy is 16.8%, the mass fraction of Mo is 4.0%, the mass fraction of Ti is 0.8%, the mass fraction of Cu is 3.3%, the mass fraction of Fe is 7.9%, and the mass fraction of C is greater than 0 and less than Equal to 0.03%, the balance is Ni.

The preparation method of the nickel-based alloy provided in this embodiment comprises the following steps:

Step 1, take by weighing Ni, Cr, Mo, Fe, Ti, Cu respectively, wherein, by mass percentage, the mass fraction of Cr is 16.8%, the mass percentage of Mo is 4.0%, the mass percentage of Ti is 0.8%, Cu The mass percentage of Fe is 3.3%, the mass percentage of Fe is 7.9%, and the balance is Ni, and the mass percentage of C inevitably substituted in Ni, Cr, Mo, Fe, Ti, Cu is greater than 0 and less than or equal to 0.03%;

Step 2: Add Ni, Cr, Mo and Fe into the vacuum induction furnace, evacuate to make the vacuum degree less than 10Pa, and then control the power transmission to 30KW, keep it warm for 10 minutes, so that Ni, Cr, Mn and Fe are less than 10Pa Melt under the vacuum conditions to obtain molten metal; then increase the power transmission to 50KW, keep warm until the molten metal liquefies and clear, and obtain molten metal after clearing;

Step 3. Use an infrared detector to detect the furnace temperature to control the refining temperature to 1500°C, and then start refining the melted molten metal. The refining time is 17 minutes. After refining, cool down until the surface of the refined liquid is obtained. Freeze the conjunctiva; wherein, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 1Pa;

Step 4, blowing argon gas into the refining solution with frozen conjunctiva on the surface, then heating to 1480°C to melt the refining solution uniformly, adding Ti and Cu and stirring evenly to obtain alloy solution;

Step 5: Lower the temperature of the alloy liquid to 1380°C, then add Mg, and then evacuate to make the vacuum less than 3Pa, desulfurize for 10 minutes under the vacuum condition of less than 3Pa, and finally cast to obtain a nickel-based alloy.

Embodiment two:

The nickel-based alloy provided in this embodiment includes Ni, Cr, Mo, Ti, Cu, Fe, and C introduced by Ni, Cr, Mo, Ti, Cu, Fe; wherein, in terms of mass fraction, the nickel-based The mass fraction of Cr in the alloy is 17.5%, the mass fraction of Mo is 6.7%, the mass fraction of Ti is 1.1%, the mass fraction of Cu is 4.0%, the mass fraction of Fe is 13.3%, and the mass fraction of C is greater than 0 and less than Equal to 0.03%, the balance is Ni.

The preparation method of the nickel-based alloy provided in this embodiment comprises the following steps:

Step 1, take Ni, Cr, Mo, Fe, Ti, Cu respectively, wherein, by mass percent, the mass percent of Cr is 17.5%, the mass percent of Mo is 6.7%, the mass percent of Ti is 1.1%, Cu The mass percentage of Fe is 4.0%, the mass percentage of Fe is 13.3%, the mass percentage of C inevitably substituted in Ni, Cr, Mo, Fe, Ti, Cu is greater than 0 and less than or equal to 0.03%, and the balance is Ni;

Step 2: Add Ni, Cr, Mo and Fe into the vacuum induction furnace, evacuate to make the vacuum degree less than 10Pa, and then control the power transmission to 30KW, keep it warm for 10 minutes, so that Ni, Cr, Mn and Fe are less than 10Pa Melt under the vacuum conditions to obtain molten metal; then increase the power transmission to 50KW, keep warm until the molten metal liquefies and clear, and obtain molten metal after clearing;

Step 3. Use an infrared detector to detect the furnace temperature to control the refining temperature to 1450°C, and then start refining the melted molten metal. The refining time is 23 minutes. After refining, cool down until the surface of the refined liquid is obtained. Freeze the conjunctiva; wherein, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 0.5Pa;

Step 4, blowing argon gas into the refining solution with frozen conjunctiva on the surface, then heating to 1490°C to melt the refining solution uniformly, adding Ti and Cu and stirring evenly to obtain alloy solution;

Step 5: Lower the temperature of the alloy liquid to 1390°C, then add Al, then vacuumize to make the vacuum less than 5Pa, desulfurize for 10 minutes under a vacuum less than 5Pa, and finally cast to obtain a nickel-based alloy.

Embodiment three:

The nickel-based alloy provided in this embodiment includes Ni, Cr, Mo, Ti, Cu, Fe, and C introduced by Ni, Cr, Mo, Ti, Cu, Fe; wherein, in terms of mass fraction, the nickel-based The mass fraction of Cr in the alloy is 21.3%, the mass fraction of Mo is 9.1%, the mass fraction of Ti is 0.6%, the mass fraction of Cu is 1.7%, the mass fraction of Fe is 12.5%, and the mass fraction of C is greater than 0 and less than Equal to 0.03%, the balance is Ni.

The preparation method of the nickel-based alloy provided in this embodiment comprises the following steps:

Step 1, take by weighing Ni, Cr, Mo, Fe, Ti, Cu respectively, wherein, by mass percentage, the mass fraction of Cr is 21.3%, the mass percentage of Mo is 9.1%, the mass percentage of Ti is 0.6%, Cu The mass percentage of Fe is 1.7%, the mass percentage of Fe is 12.5%, the mass percentage of C inevitably substituted in Ni, Cr, Mo, Fe, Ti, Cu is greater than 0 and less than or equal to 0.03%, and the balance is Ni;

Step 2: Add Ni, Cr, Mo, Fe into the vacuum induction furnace, evacuate to make the vacuum degree less than 6Pa, and then control the power transmission to 30KW, keep it warm for 10 minutes, so that Ni, Cr, Mn, Fe are less than 6Pa Melt under the vacuum conditions to obtain molten metal; then increase the power transmission to 50KW, keep warm until the molten metal liquefies and clear, and obtain molten metal after clearing;

Step 3. Use an infrared detector to detect the furnace temperature to control the refining temperature to 1470°C, and then start refining the melted molten metal. The refining time is 20 minutes. After refining, cool down until the surface of the refined liquid is obtained. Freeze the conjunctiva; wherein, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 1Pa;

Step 4, blowing argon gas into the refining liquid with frozen conjunctiva on the surface, then heating to 1486°C to melt the refining liquid uniformly, adding Ti and Cu and stirring evenly to obtain alloy liquid;

Step 5: Lower the temperature of the alloy liquid to 1384°C, then add Al, then vacuumize to make the vacuum less than 1Pa, desulfurize for 12 minutes under the vacuum condition of less than 1Pa, and finally cast to obtain a nickel-based alloy.

Embodiment four:

The nickel-based alloy provided in this embodiment includes Ni, Cr, Mo, Ti, Cu, Fe, and C introduced by Ni, Cr, Mo, Ti, Cu, Fe; wherein, in terms of mass fraction, the nickel-based The mass fraction of Cr in the alloy is 24.5%, the mass fraction of Mo is 5.8%, the mass fraction of Ti is 0.5%, the mass fraction of Cu is 2.6%, the mass fraction of Fe is 15.0%, and the mass fraction of C is greater than 0 and less than Equal to 0.03%, the balance is Ni.

The preparation method of the nickel-based alloy provided in this embodiment comprises the following steps:

Step 1, take by weighing Ni, Cr, Mo, Fe, Ti, Cu respectively, wherein, by mass percentage, the mass fraction of Cr is 24.5%, the mass percentage of Mo is 5.8%, the mass percentage of Ti is 0.5%, Cu The mass percentage of Fe is 2.6%, the mass percentage of Fe is 15.0%, the mass percentage of C inevitably substituted in Ni, Cr, Mo, Fe, Ti, Cu is greater than 0 and less than or equal to 0.03%, and the balance is Ni;

Step 2: Add Ni, Cr, Mo, Fe into the vacuum induction furnace, evacuate to make the vacuum degree less than 6Pa, and then control the power transmission to 30KW, keep it warm for 10 minutes, so that Ni, Cr, Mn, Fe are less than 6Pa Melt under the vacuum conditions to obtain molten metal; then increase the power transmission to 50KW, keep warm until the molten metal liquefies and clear, and obtain molten metal after clearing;

Step 3. Use an infrared detector to detect the furnace temperature to control the refining temperature to 1480°C, and then start refining the melted molten metal. The refining time is 21 minutes. After refining, cool down until the surface of the refined liquid is obtained. Freeze the conjunctiva; wherein, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 1Pa;

Step 4, blowing argon gas into the refining solution with frozen conjunctiva on the surface, then heating to 1485°C to melt the refining solution uniformly, adding Ti and Cu and stirring evenly to obtain alloy solution;

Step 5: Lower the temperature of the alloy liquid to 1380°C, then add Mg, and then evacuate to make the vacuum less than 1Pa, desulfurize for 12 minutes under the vacuum condition of less than 1Pa, and finally cast to obtain a nickel-based alloy.

Embodiment five:

The nickel-based alloy provided in this embodiment includes Ni, Cr, Mo, Ti, Cu, Fe, and C introduced by Ni, Cr, Mo, Ti, Cu, Fe; wherein, in terms of mass fraction, the nickel-based The mass fraction of Cr in the alloy is 26.7%, the mass fraction of Mo is 13.0%, the mass fraction of Ti is 1.4%, the mass fraction of Cu is 1.0%, the mass fraction of Fe is 6.0%, and the mass fraction of C is greater than 0 and less than Equal to 0.03%, the balance is Ni.

The preparation method of the nickel-based alloy provided in this embodiment comprises the following steps:

Step 1, take by weighing Ni, Cr, Mo, Fe, Ti, Cu respectively, wherein, by mass percentage, the mass fraction of Cr is 26.7%, the mass percentage of Mo is 13.0%, the mass percentage of Ti is 1.4%, Cu The mass percentage of Fe is 1.0%, the mass percentage of Fe is 6.0%, the mass percentage of C inevitably substituted in Ni, Cr, Mo, Fe, Ti, Cu is greater than 0 and less than or equal to 0.03%, and the balance is Ni;

Step 2: Add Ni, Cr, Mo, Fe into the vacuum induction furnace, evacuate to make the vacuum degree less than 8Pa, and then control the power transmission to 30KW, keep it warm for 10 minutes, so that Ni, Cr, Mn, Fe are less than 8Pa Melt under the vacuum conditions to obtain molten metal; then increase the power transmission to 50KW, keep warm until the molten metal liquefies and clear, and obtain molten metal after clearing;

Step 3. Use an infrared detector to detect the furnace temperature to control the refining temperature to 1500°C, and then start refining the melted molten metal. The refining time is 18 minutes. After refining, cool down until the surface of the refined liquid is obtained. Freeze the conjunctiva; wherein, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 0.4Pa;

Step 4: Blow nitrogen gas into the refining liquid with conjunctiva frozen on the surface, then heat to 1489°C to melt the refining liquid uniformly, add Ti and Cu and stir evenly to obtain alloy liquid;

Step 5: Lower the temperature of the alloy liquid to 1390°C, then add Al, then vacuumize to make the vacuum less than 1Pa, desulfurize for 17 minutes under the vacuum condition of less than 1Pa, and finally cast to obtain a nickel-based alloy.

Embodiment six:

The nickel-based alloy provided in this embodiment includes Ni, Cr, Mo, Ti, Cu, Fe, and C introduced by Ni, Cr, Mo, Ti, Cu, Fe; wherein, in terms of mass fraction, the nickel-based The mass fraction of Cr in the alloy is 28.0%, the mass fraction of Mo is 10.5%, the mass fraction of Ti is 0.9%, the mass fraction of Cu is 2.9%, the mass fraction of Fe is 7.5%, and the mass fraction of C is greater than 0 and less than Equal to 0.03%, the balance is Ni.

The preparation method of the nickel-based alloy provided in this embodiment comprises the following steps:

Step 1, take by weighing Ni, Cr, Mo, Fe, Ti, Cu respectively, wherein, by mass percentage, the mass fraction of Cr is 28.0%, the mass percentage of Mo is 10.5%, the mass percentage of Ti is 0.9%, Cu The mass percentage of Fe is 2.9%, the mass percentage of Fe is 7.5%, the mass percentage of C inevitably substituted by Ni, Cr, Mo, Fe, Ti, Cu is greater than 0 and less than or equal to 0.03%, and the balance is Ni;

Step 2: Add Ni, Cr, Mo and Fe into the vacuum induction furnace, evacuate to make the vacuum degree less than 10Pa, and then control the power transmission to 30KW, keep it warm for 10 minutes, so that Ni, Cr, Mn and Fe are less than 10Pa Melt under the vacuum conditions to obtain molten metal; then increase the power transmission to 50KW, keep warm until the molten metal liquefies and clear, and obtain molten metal after clearing;

Step 3. Use an infrared detector to detect the furnace temperature to control the refining temperature to 1450°C, and then start refining the melted molten metal. The refining time is 23 minutes. After refining, cool down until the surface of the refined liquid is obtained. Freeze the conjunctiva; wherein, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 1Pa;

Step 4, blowing argon gas into the refining solution with frozen conjunctiva on the surface, then heating to 1485°C to melt the refining solution uniformly, adding Ti and Cu and stirring evenly to obtain alloy solution;

Step 5: Lower the temperature of the alloy liquid to 1385°C, then add Mg, and then vacuumize to make the vacuum degree less than 5Pa, desulfurize for 12 minutes under the vacuum degree of less than 5Pa, and finally cast to obtain a nickel-based alloy.

Embodiment seven:

The nickel-based alloy provided in this embodiment includes Ni, Cr, Mo, Ti, Cu, Fe, and C introduced by Ni, Cr, Mo, Ti, Cu, Fe; wherein, in terms of mass fraction, the nickel-based The mass fraction of Cr in the alloy is 23.2%, the mass fraction of Mo is 7.9%, the mass fraction of Ti is 1.5%, the mass fraction of Cu is 1.3%, the mass fraction of Fe is 9.4%, and the mass fraction of C is greater than 0 and less than Equal to 0.03%, the balance is Ni.

The preparation method of the nickel-based alloy provided in this embodiment comprises the following steps:

Step 1, take by weighing Ni, Cr, Mo, Fe, Ti, Cu respectively, wherein, by mass percentage, the mass fraction of Cr is 23.2%, the mass percentage of Mo is 7.9%, the mass percentage of Ti is 1.5%, Cu The mass percentage of Fe is 1.3%, the mass percentage of Fe is 9.4%, the mass percentage of C inevitably substituted in Ni, Cr, Mo, Fe, Ti, Cu is greater than 0 and less than or equal to 0.03%, and the balance is Ni;

Step 2: Add Ni, Cr, Mo and Fe into the vacuum induction furnace, evacuate to make the vacuum degree less than 10Pa, and then control the power transmission to 30KW, keep it warm for 10 minutes, so that Ni, Cr, Mn and Fe are less than 10Pa Melt under the vacuum conditions to obtain molten metal; then increase the power transmission to 50KW, keep warm until the molten metal liquefies and clear, and obtain molten metal after clearing;

Step 3. Use an infrared detector to detect the furnace temperature to control the refining temperature to 1450°C, and then start refining the melted molten metal. The refining time is 23 minutes. After refining, cool down until the surface of the refined liquid is obtained. Freeze the conjunctiva; wherein, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 1Pa;

Step 4, blowing argon gas into the refining solution with frozen conjunctiva on the surface, then heating to 1485°C to melt the refining solution uniformly, adding Ti and Cu and stirring evenly to obtain alloy solution;

Step 5: Lower the temperature of the alloy liquid to 1390°C, then add Al, and then vacuumize to make the vacuum degree less than 5Pa, desulfurize for 17 minutes under the vacuum degree of less than 5Pa, and finally cast to obtain a nickel-based alloy.

Embodiment eight:

The nickel-based alloy provided in this embodiment includes Ni, Cr, Mo, Ti, Cu, Fe, W and C introduced by Ni, Cr, Mo, Ti, Cu, Fe, W; wherein, in terms of mass fraction, the The mass fraction of Cr in the nickel-based alloy is 15%, the mass fraction of Mo is 5%, the mass fraction of Ti is 0.55%, the mass fraction of Cu is 2%, the mass fraction of Fe is 13%, and the mass fraction of C is Greater than 0 and less than or equal to 0.02%, the mass fraction of W is 0.5%, and the balance is Ni.

The preparation method of the nickel-based alloy provided in this embodiment comprises the following steps:

Step 1, respectively weigh Ni, Cr, Mo, Fe, Ti, Cu and W, wherein, in terms of mass percentage, the mass fraction of Cr is 15%, the mass percentage of Mo is 5%, and the mass percentage of Ti is 0.55% , the mass percentage of Cu is 2%, the mass percentage of Fe is 13%, the mass fraction of W is 0.5%, and the balance is Ni, Ni, Cr, Mo, Fe, Ti, Cu and C that are inevitably substituted in W The mass percentage is greater than 0 and less than or equal to 0.02%;

Step 2: Add Ni, Cr, Mo and Fe into the vacuum induction furnace, evacuate to make the vacuum degree less than 10Pa, and then control the power transmission to 30KW, keep it warm for 10 minutes, so that Ni, Cr, Mn and Fe are less than 10Pa Melt under the vacuum conditions to obtain molten metal; then increase the power transmission to 50KW, keep warm until the molten metal liquefies and clear, and obtain molten metal after clearing;

Step 3. Use an infrared detector to detect the furnace temperature to control the refining temperature to 1450°C, and then start refining the melted molten metal. The refining time is 23 minutes. After refining, cool down until the surface of the refined liquid is obtained. Freeze the conjunctiva; wherein, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 1Pa;

Step 4: Blow nitrogen gas into the refining solution with conjunctiva frozen on the surface, then heat to 1485°C to melt the refining solution uniformly, add Ti, Cu and W and stir evenly to obtain alloy solution;

Step 5. Lower the temperature of the alloy liquid to 1380°C, then add Mg, and then vacuumize to make the vacuum degree less than 5Pa, desulfurize for 17 minutes under the vacuum condition of less than 5Pa, and finally cast to obtain a nickel-based alloy.

The mass percentage of W in this embodiment can also be 0.1% or 0.3%. It should be noted that this is only for illustration, not limitation.

Embodiment nine:

The nickel-based alloy provided in this embodiment includes Ni, Cr, Mo, Ti, Cu, Fe, Al, Mn, and C introduced by Ni, Cr, Mo, Ti, Cu, Fe, Al, Mn; wherein, In terms of mass fraction, the mass fraction of Cr in the nickel base alloy is 20%, the mass fraction of Mo is 10%, the mass fraction of Ti is 1.0%, the mass fraction of Cu is 3.5%, and the mass fraction of Fe is 14%, The mass fraction of C is greater than 0 and less than or equal to 0.03%, the mass fraction of Al is 0.4%, and the mass fraction of Mn is 0.1%; the balance is Ni.

The preparation method of the nickel-based alloy provided in this embodiment comprises the following steps:

Step 1, take by weighing Ni, Cr, Mo, Fe, Ti, Cu, Al, Mn respectively, wherein, by mass percent, the massfraction of Cr is 28.0%, the massfraction of Mo is 10%, the massfraction of Ti is 1.0%, the mass fraction of Cu is 3.5%, the mass fraction of Fe is 14%, the mass fraction of Al is 0.4%, the mass fraction of Mn is 0.1%, and the balance is Ni, Ni, Cr, Mo, Fe, Ti, Cu , Al, Mn, the mass percentage of C inevitably substituted is greater than 0 and less than or equal to 0.01%;

Step 2: Add Ni, Cr, Mo and Fe into the vacuum induction furnace, evacuate to make the vacuum degree less than 10Pa, and then control the power transmission to 30KW, keep it warm for 10 minutes, so that Ni, Cr, Mn and Fe are less than 10Pa Melt under the vacuum conditions to obtain molten metal; then increase the power transmission to 50KW, keep warm until the molten metal liquefies and clear, and obtain molten metal after clearing;

Step 3. Use an infrared detector to detect the furnace temperature to control the refining temperature to 1450°C, and then start refining the melted molten metal. The refining time is 20 minutes. After refining, cool down until the surface of the refined liquid is obtained. Freeze the conjunctiva; wherein, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 1Pa;

Step 4, blowing argon gas into the refining liquid with frozen conjunctiva on the surface, then heating to 1485°C to melt the refining liquid uniformly, adding Ti, Cu, Al and Mn and stirring evenly to obtain alloy liquid;

Step 5: Lower the temperature of the alloy liquid to 1380°C, then add Al, then vacuumize to make the vacuum less than 5Pa, desulfurize for 12 minutes under the vacuum condition of less than 5Pa, and finally cast to obtain a nickel-based alloy.

In this embodiment, the mass percentage of Al can also be 0.2%, and the mass percentage of Mn at this time is 0.3%; it should be noted that this is only for illustration, not for limitation.

Embodiment ten:

The nickel-based alloy provided in this embodiment includes Ni, Cr, Mo, Ti, Cu, Fe, B, and C introduced by Ni, Cr, Mo, Ti, Cu, Fe, B; wherein, in mass fraction, The mass fraction of Cr in the nickel base alloy is 25%, the mass fraction of Mo is 5.8%, the mass fraction of Ti is 0.8%, the mass fraction of Cu is 3%, the mass fraction of Fe is 15.0%, and the mass fraction of C is greater than 0 and less than or equal to 0.02%, the mass fraction of B is 0.006%.

The preparation method of the nickel-based alloy provided in this embodiment comprises the following steps:

Step 1, take Ni, Cr, Mo, Ti, Cu, Fe, B respectively, wherein, by mass percentage, the mass fraction of Cr is 25%, the mass fraction of Mo is 5.8%, and the mass fraction of Ti is 0.8% , the mass fraction of Cu is 3%, the mass fraction of Fe is 15.0%, the mass fraction of B is 0.006%, and the balance is Ni, Ni, Cr, Mo, Fe, Ti, Cu, B which are inevitably substituted for C The mass fraction is greater than 0 and less than or equal to 0.02%;

Step 2: Add Ni, Cr, Mo, Fe into the vacuum induction furnace, evacuate to make the vacuum degree less than 6Pa, and then control the power transmission to 30KW, keep it warm for 10 minutes, so that Ni, Cr, Mn, Fe are less than 6Pa Melt under the vacuum conditions to obtain molten metal; then increase the power transmission to 50KW, keep warm until the molten metal liquefies and clear, and obtain molten metal after clearing;

Step 3. Use an infrared detector to detect the furnace temperature to control the refining temperature to 1480°C, and then start refining the melted molten metal. The refining time is 21 minutes. After refining, cool down until the surface of the refined liquid is obtained. Freeze the conjunctiva; wherein, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 1Pa;

Step 4, blowing nitrogen gas into the refining liquid with conjunctiva frozen on the surface, then heating to 1485°C to melt the refining liquid uniformly, adding Ti, Cu and B and stirring evenly to obtain alloy liquid;

Step 5: Lower the temperature of the alloy liquid to 1380°C, then add Mg, and then evacuate to make the vacuum less than 1Pa, desulfurize for 12 minutes under the vacuum condition of less than 1Pa, and finally cast to obtain a nickel-based alloy.

Embodiment eleven:

The nickel-based alloy provided in this embodiment includes Ni, Cr, Mo, Ti, Cu, Fe, V, Nb, Co and C introduced by Ni, Cr, Mo, Ti, Cu, Fe, V, Nb, Co; Wherein, in terms of mass fraction, the mass fraction of Cr in the nickel-based alloy is 15%, the mass fraction of Mo is 7.9%, the mass fraction of Ti is 1.5%, the mass fraction of Cu is 1.3%, and the mass fraction of Fe is 9.4%, the mass fraction of C is greater than 0 and less than or equal to 0.03%, the mass fraction of V is 0.1%, the mass fraction of Nb is 0.1%, the mass fraction of Co is 0.3%, and the balance is Ni.

The preparation method of the nickel-based alloy provided in this embodiment comprises the following steps:

Step 1, take Ni, Cr, Mo, Fe, Ti, Cu, V, Nb, Co respectively; Wherein, by mass percentage, the mass fraction of Cr is 15%, the mass fraction of Mo is 7.9%, the mass fraction of Ti The fraction is 1.5%, the mass fraction of Cu is 1.3%, the mass fraction of Fe is 9.4%, the mass fraction of V is 0.1%, the mass fraction of Nb is 0.1%, the mass fraction of Co is 0.3%, and the balance is Ni; The mass percentage of C inevitably substituted in Ni, Cr, Mo, Fe, Ti, Cu, V, Nb, Co is greater than 0 and less than or equal to 0.03%;

Step 2: Add Ni, Cr, Mo and Fe into the vacuum induction furnace, evacuate to make the vacuum degree less than 10Pa, and then control the power transmission to 30KW, keep it warm for 10 minutes, so that Ni, Cr, Mn and Fe are less than 10Pa Melt under the vacuum conditions to obtain molten metal; then increase the power transmission to 50KW, keep warm until the molten metal liquefies and clear, and obtain molten metal after clearing;

Step 3. Use an infrared detector to detect the furnace temperature to control the refining temperature to 1450°C, and then start refining the melted molten metal. The refining time is 17 minutes. After refining, cool down until the surface of the refined liquid is obtained. Freeze the conjunctiva; wherein, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 1Pa;

Step 4, blowing argon gas into the refining liquid with frozen conjunctiva on the surface, then heating to 1485°C to melt the refining liquid uniformly, adding Ti, Cu, V, Nb and Co and stirring evenly to obtain alloy liquid;

Step 5: Lower the temperature of the alloy liquid to 1386°C, then add Mg, and then vacuumize to make the vacuum less than 5Pa, desulfurize for 17 minutes under the vacuum condition of less than 5Pa, and finally cast to obtain a nickel-based alloy.

The mass fraction of V in this embodiment can also be 0.2%, the mass fraction of Nb is 0.1%, and the mass fraction of Co is 0.2%. It should be noted that this is only for illustration, not limitation.

Embodiment 12:

The nickel-based alloy provided in this embodiment includes Ni, Cr, Mo, Ti, Cu, Fe, V, and C introduced by Ni, Cr, Mo, Ti, Cu, Fe, V; wherein, in mass fraction, The mass fraction of Cr in the nickel base alloy is 24.5%, the mass fraction of Mo is 5.8%, the mass fraction of Ti is 0.5%, the mass fraction of Cu is 3%, the mass fraction of Fe is 14.0%, and the mass fraction of C is greater than 0 and less than or equal to 0.03%, the mass fraction of V is 0.4%, and the balance is Ni.

The preparation method of the nickel-based alloy provided in this embodiment comprises the following steps:

Step 1, take Ni, Cr, Mo, Fe, Ti, Cu, V respectively; Wherein, by mass percentage, the mass fraction of Cr is 24.5%, the mass fraction of Mo is 5.8%, and the mass fraction of Ti is 0.5% , the mass fraction of Cu is 3%, the mass fraction of Fe is 14.0%, the mass fraction of V is 0.4%, and the balance is Ni; The mass percentage is greater than 0 and less than or equal to 0.03%;

Step 2: Add Ni, Cr, Mo, Fe into the vacuum induction furnace, evacuate to make the vacuum degree less than 6Pa, and then control the power transmission to 30KW, keep it warm for 10 minutes, so that Ni, Cr, Mn, Fe are less than 6Pa Melt under the vacuum conditions to obtain molten metal; then increase the power transmission to 50KW, keep warm until the molten metal liquefies and clear, and obtain molten metal after clearing;

Step 3. Use an infrared detector to detect the furnace temperature to control the refining temperature to 1480°C, and then start refining the melted molten metal. The refining time is 21 minutes. After refining, cool down until the surface of the refined liquid is obtained. Freeze the conjunctiva; wherein, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 1Pa;

Step 4, blowing argon gas into the refining liquid with frozen conjunctiva on the surface, then heating to 1485°C to melt the refining liquid uniformly, adding Ti, Cu and V and stirring evenly to obtain alloy liquid;

Step 5: Lower the temperature of the alloy liquid to 1380°C, then add Al, then vacuumize to make the vacuum less than 1Pa, desulfurize for 12 minutes under the vacuum condition of less than 1Pa, and finally cast to obtain a nickel-based alloy.

V in this embodiment can also be replaced by Co, and the mass fraction of Co is 0.2% or 0.1%. It should be noted that this is only for illustration, not limitation.

Embodiment thirteen:

The nickel-based alloy provided in this embodiment includes Ni, Cr, Mo, Ti, Cu, Fe, Nb and C introduced by Ni, Cr, Mo, Ti, Cu, Fe, Nb; wherein, in terms of mass fraction, all The mass fraction of Cr in the nickel-based alloy is 24%, the mass fraction of Mo is 5.8%, the mass fraction of Ti is 0.5%, the mass fraction of Cu is 2.6%, the mass fraction of Fe is 15.0%, and the mass fraction of C is Greater than 0 and less than or equal to 0.03%, the mass fraction of Nb is 0.5%, and the balance is Ni.

The preparation method of the nickel-based alloy provided in this embodiment comprises the following steps:

Step 1. Weigh Ni, Cr, Mo, Fe, Ti, Cu, Nb respectively; wherein, in terms of mass percentage, the mass fraction of Cr in the nickel-based alloy is 24%, the mass fraction of Mo is 5.8%, and the mass fraction of Ti The mass fraction of Cu is 0.5%, the mass fraction of Cu is 2.6%, the mass fraction of Fe is 15.0%, the mass fraction of Nb is 0.5%, and the balance is Ni; Ni, Cr, Mo, Fe, Ti, Cu, Nb The mass percentage of unavoidably substituted C is greater than 0 and less than or equal to 0.03%;

Step 2: Add Ni, Cr, Mo, Fe into the vacuum induction furnace, evacuate to make the vacuum degree less than 6Pa, and then control the power transmission to 30KW, keep it warm for 10 minutes, so that Ni, Cr, Mn, Fe are less than 6Pa Melt under the vacuum conditions to obtain molten metal; then increase the power transmission to 50KW, keep warm until the molten metal liquefies and clear, and obtain molten metal after clearing;

Step 3. Use an infrared detector to detect the furnace temperature to control the refining temperature to 1480°C, and then start refining the melted molten metal. The refining time is 21 minutes. After refining, cool down until the surface of the refined liquid is obtained. Freeze the conjunctiva; wherein, when reaching half of the refining time, increase the vacuum degree so that the vacuum degree is not greater than 1Pa;

Step 4, blowing argon gas into the refining solution with frozen conjunctiva on the surface, then heating to 1485°C to melt the refining solution uniformly, adding Ti, Cu and Nb and stirring evenly to obtain alloy solution;

Step 5: Lower the temperature of the alloy liquid to 1380°C, then add Mg, and then evacuate to make the vacuum less than 1Pa, desulfurize for 12 minutes under the vacuum condition of less than 1Pa, and finally cast to obtain a nickel-based alloy.

The mass percentage of Nb in this embodiment may also be 0.4%. It should be noted that this is only for illustration, not limitation.

8 samples were randomly selected from the nickel-based alloy prepared in the above-mentioned embodiment 1 to embodiment 13, and then the following corrosion resistance tests were carried out for these 8 samples, Inconel-625 material and Hastelloy C-276 material:

test one

Under the environment of 300℃, 23MPa, and pH value of 6, the following six alloys were tested for 500h by using the mixed aqueous solution added with hydrogen peroxide; the six alloys were Inconel-625 material, Hastelloy C-276 material, implementation The nickel-based alloy of Example 1, the nickel-based alloy of Example 3, the nickel-based alloy of Example 4, and the nickel-based alloy prepared in Example 6; wherein, the solutes in the mixed aqueous solution are Na ₂ SO ₄ , Na ₃ PO ₄ and NaCl _The concentration of _Na2SO4 is 2.0g/L, the concentration _{of Na3PO4} is 0.5g/L, the concentration of NaCl is 1.0g/L, the effect of hydrogen peroxide is to provide oxygen, and its mass concentration is 2%.

After calculation, the average annual corrosion rate (mm/yr) of each alloy at 300 °C is shown in Table 1:

Table 1 The annual average corrosion rate results of each alloy at 300 °C

Test two

Under the environment of 450°C, 23MPa, and pH value of 6, the following six alloys were tested for 500h by using the mixed aqueous solution added with hydrogen peroxide; the six alloys were Inconel-625 material, Hastelloy C-276 material, Example The nickel-based alloy obtained in Example 2, the nickel-based alloy obtained in Example 5, the nickel-based alloy obtained in Example 7, and the nickel-based alloy obtained in Example 10; wherein, the solute in the mixed aqueous solution is Na ₂ SO ₄ , Na ₃ PO ₄ and NaCl; the concentration of Na ₂ SO ₄ is 2.0g/L, the concentration of Na ₃ PO ₄ is 0.5g/L, and the concentration of NaCl is 1.0g/L. The function of hydrogen peroxide is to provide oxygen, and its mass concentration 2%.

According to calculation, in this environment, the annual average corrosion rate (mm/yr) of each alloy at 450°C is as follows:

Table 2 The annual average corrosion rate results of each alloy at 450°C

Since the corrosion effect under the conditions of the second test is more obvious, the corrosion resistance test data in the second test is selected for further analysis; taking the corrosion-resistant alloy prepared in Example 2 in the second test as an example, the analysis results show that: Inconel- The corroded thickness of the 625 material is 4.0 μm, the corroded thickness of the Hastelloy C-276 material is 7.8 μm, and the corroded thickness of the nickel-based alloy prepared in embodiment two is 1.97 μm, therefore, the nickel-based alloy provided by embodiment two is relatively Inconel- The corrosion thickness of 625 material and Hastelloy C-276 material is small, and the density is better than that of Inconel-625 material and Hastelloy C-276 material.

In summary, it can be seen that the corrosion rate of the nickel-based alloy prepared by this scheme is greatly reduced compared with Hastelloy C-276 material and Inconel-625 material in the acidic oxidizing medium where various ions exist. Therefore, the present invention prepares The nickel-based alloy has good corrosion resistance in the acidic oxidizing medium in the presence of various ions, and can be used in supercritical equipment.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (9)

1. a nickel-base alloy, it is characterized in that, in massfraction, comprise the Cr that massfraction is 15%-28%, massfraction is the Mo of 4%-13%, massfraction is the Ti of 0.5%-1.5%, massfraction is the Cu of 1%-4%, and massfraction is the Fe of 6%-15%, and massfraction is be greater than the C that 0 is less than or equal to 0.03%, massfraction is the trace element of 0-0.5%, and surplus is Ni.

2. nickel-base alloy according to claim 1, it is characterized in that, described nickel-base alloy comprises the Cr that massfraction is 17.5%-25%, massfraction is the Mo of 4%-10%, and massfraction is the Ti of 0.55%-1.0%, and massfraction is the Cu of 2%-3.5%, massfraction is the Fe of 7%-14%, massfraction is be greater than the C that 0 is less than or equal to 0.02%, and massfraction is the trace element of 0-0.3%, and surplus is Ni.

3. nickel-base alloy according to claim 1, it is characterized in that, described nickel-base alloy comprises the Cr that massfraction is 16.8%-24.5%, massfraction is the Mo of 5.8%-10.5%, and massfraction is the Ti of 0.6%-1.0%, and massfraction is the Cu of 2%-3%, massfraction is the Fe of 7%-13%, the massfraction of C is less than or equal to 0.01% for being greater than 0, and the massfraction of trace element is 0-0.3%, and surplus is Ni.

4. nickel-base alloy according to claim 1, it is characterized in that, described nickel-base alloy comprises the Cr that massfraction is 16%-20%, massfraction is the Mo of 5%-10%, and massfraction is the Ti of 0.6%-1.0%, and massfraction is the Cu of 2%-4%, massfraction is the Fe of 7.5%-12.5%, massfraction is be greater than the C that 0 is less than or equal to 0.01%, and massfraction is the trace element of 0-0.5%, and surplus is Ni.

5., according to the nickel-base alloy in claim 1-4 described in any one, it is characterized in that, described trace element comprise in W, Al, Mn, V, Nb, Co, B one or more.

6. nickel-base alloy according to claim 5, is characterized in that, in described nickel-base alloy,

The massfraction of described W is less than or equal to 0.5% for being greater than 0; And/or

The massfraction of described Al is greater than 0 and is less than or equal to 0.4%; And/or

The massfraction of described Mn is greater than 0 and is less than or equal to 0.4%; And/or

The massfraction of described V is greater than 0 and is less than or equal to 0.4%; And/or

The massfraction of described Nb is greater than 0 and is less than or equal to 0.5%; And/or

The massfraction of described Co is greater than 0 and is less than or equal to 0.3%; And/or

The massfraction of described B is greater than 0 and is less than or equal to 0.006%.

7. a preparation method for nickel-base alloy, is characterized in that, comprises the following steps:

Step one, take Ni, Cr, Mo, Fe, Ti, Cu and trace element respectively, wherein, be calculated in mass percent, the massfraction of Cr is 15%-28%, the mass percent of the mass percent of Mo to be the mass percent of 4%-13%, Ti be 0.5%-1.5%, Cu is 1%-4%, the mass percent of Fe is 6%-15%, and the mass percent of trace element is 0-0.5%; The mass percent of the C substituted in Ni, Cr, Mo, Fe, Ti, Cu and trace element is greater than 0 and is less than or equal to 0.03%, and surplus is Ni;

Step 2, by Ni, Cr, Mo, Fe under vacuum mixed melting until change clear, obtaining clearly after molten metal bath;

Step 3, clear to describedization after molten metal bath carry out refining, cooling after refining completes is until the refining liquid shallow freezing conjunctiva that obtains;

Step 4, in the described refining liquid of shallow freezing conjunctiva, be blown into protective gas, then that described refining liquid is melted is homogeneous in heating, adds Ti, Cu and trace element and stirs, obtaining aluminium alloy;

Step 5, in aluminium alloy, add sweetening agent, then vacuumize, be incubated under vacuum with the desulfurization of alloy liquid, last casting, obtains nickel-base alloy.

8. the preparation method of nickel-base alloy according to claim 7, is characterized in that, during described step 3 refining, refining temperature is 1450 DEG C-1500 DEG C, and refining time is 17 minutes-23 minutes, in step 5, before adding sweetening agent, the temperature of aluminium alloy is controlled at 1380-1390 DEG C.

9. the nickel-base alloy in a claim 1-6 described in any one is as the application of corrosion resistant material in overcritical equipment.