Low-sulfur and low-phosphorus nickel-iron-chromium alloy forge piece and production process thereof

Abstract

The invention discloses a low-sulfur and low-phosphorus nickel-iron-chromium alloy forge piece and a production process thereof, and belongs to the technical field of forging, and the low-sulfur and low-phosphorus nickel-iron-chromium alloy forge piece comprises the following components in percentage by mass: 0.005-0.008% of sulfur, 0.012-0.015% of phosphorus, 9.6-10.5% of nickel, 4.5-7.6% of tin, 0.008-0.016% of ruthenium, 15.1-17.3% of chromium and the balance of iron. According to the invention, the consumption of phosphorus, sulfur and nickel is reduced, the corrosion to the alloy is effectively reduced, and the cost is reduced; a five-heating-number forging process is adopted, and the obtained effect is basically equivalent to the effect obtained by carrying out forging deformation treatment on the alloy through an eight-heating-number forging process; a dual annealing process is adopted, wherein the forging deformation treatment effect of the primary annealing medium temperature and the secondary annealing low temperature on the forge piece is basically equivalent to the forging deformation treatment effect of the primary annealing high temperature and the secondary annealing low temperature on the forge piece; the high-current pulse electron beam is added to irradiate the nickel-iron-chromium alloy casting, so that the performance of the nickel-iron-chromium alloy forging is remarkably enhanced.

Description

Technical Field

[0001] The present invention relates to the field of forging technology, and particularly to a nickel-iron-chromium alloy forging with low sulfur and phosphorus and its production process. Background Art

[0002] Phosphorus and sulfur in alloys are harmful elements that can affect the plasticity, toughness, and welding performance of alloy materials and their application products. Melting is an important link in alloy preparation. Only high-quality melted products with uniform chemical composition and structure and few inclusions can be processed into forgings with stable batch properties in subsequent processes. Forging is one of the main processing methods for alloy structural parts. When the chemical composition is fixed, the quality of alloy forgings mainly depends on the forging process, and alloys are sensitive to forging process parameters.

[0003] Chinese invention patent CN117265440B discloses a preparation method of a nickel-based superalloy forging. By mass percentage, the composition of the nickel-based superalloy includes: nickel ≥ 30.0%, chromium ≥ 19%, carbon ≤ 0.10%, silicon ≤ 1.00%, manganese ≤ 1.5%, phosphorus ≤ 0.030%, sulfur ≤ 0.015%, copper ≤ 0.75%, and the balance is iron; the nickel-based superalloy forging has excellent mechanical properties.

[0004] However, in this research, the contents of phosphorus, sulfur, and nickel are relatively high. The adverse effects of phosphorus and sulfur on the toughness and plasticity of the alloy indirectly affect the cold working performance, and sulfide inclusions can also become corrosion sources, accelerating the corrosion of the alloy; nickel is a relatively expensive metal element, and adding nickel to the alloy will significantly increase the raw material cost.

[0005] Based on this, the present invention designs a nickel-iron-chromium alloy forging with low sulfur and phosphorus and its production process to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned drawbacks existing in the prior art, the present invention provides a nickel-iron-chromium alloy forging with low sulfur and phosphorus and its production process.

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0008] The nickel-iron-chromium alloy forging with low sulfur and phosphorus is composed of the following components by mass percentage: sulfur 0.005 - 0.008%, phosphorus 0.012 - 0.015%, nickel 9.6 - 10.5%, tin 4.5 - 7.6%, ruthenium 0.008 - 0.016%, chromium 15.1 - 17.3%, and the balance is iron, and the sum of the mass percentages of the above components is 100%.

[0009] Furthermore, nickel, tin, ruthenium, chromium, and iron are derived from nickel powder, tin ingot, ruthenium chloride, ferrochrome alloy, and iron powder in sequence.

[0010] To better achieve the object of the present invention, the present invention also provides a production process for the low-sulfur and low-phosphorus nickel-iron-chromium alloy forging, including the following steps:

[0011] Step 1: Put nickel powder, tin ingot, ruthenium chloride, ferrochromium alloy and iron powder into a vacuum induction furnace for melting, so that the materials are melted and mixed evenly to obtain a nickel-iron-chromium alloy melt;

[0012] Step 2: Cast the obtained nickel-iron-chromium alloy melt by investment casting to obtain a preliminary nickel-iron-chromium alloy casting;

[0013] Step 3: Irradiate the preliminary nickel-iron-chromium alloy casting with a high-current pulsed electron beam with an energy density of 6.2 - 6.6 J / cm 2 , a pulse width of 2.1 - 2.4 μs for 1 - 3 times, and each irradiation lasts for 5 - 15 s;

[0014] Step 4: Perform melt ultrasonic treatment on the irradiated nickel-iron-chromium alloy casting to obtain a homogenized nickel-iron-chromium alloy casting;

[0015] Step 5: Cut the nickel-iron-chromium alloy casting in Step 4 into appropriate blanks;

[0016] Step 6: Perform forging deformation treatment on the blank by five-pass forging:

[0017] First, perform two-pass forging on the blank above the phase transformation point (700 - 800 °C):

[0018] The technological process of the first-pass forging is: three draws and three upsets at 890 ± 8 °C, and then at 830 ± 8 °C, hold for 90 - 100 min;

[0019] The technological process of the second-pass forging is: two draws and two upsets at 840 ± 8 °C, and then at 830 ± 8 °C, hold for 90 - 100 min;

[0020] Then, perform three-pass forging on the blank below the phase transformation point (700 - 800 °C):

[0021] The technological process of the third-pass forging is: three draws and three upsets at 750 ± 30 °C, and then at 750 ± 30 °C, hold for 180 - 280 min;

[0022] The technological process of the fourth-pass forging is: two draws and two upsets at 750 ± 30 °C, and then at 750 ± 30 °C, hold for 180 - 280 min;

[0023] The technological process of the fifth forging is as follows: one drawing and one upsetting are carried out at 750 ± 30 °C, and then at 750 ± 30 °C, heat preservation is carried out for 180 - 80 min. After forging through five forging heats, a forging with preliminary forging deformation is obtained;

[0024] Step seven: The preliminary forging obtained by the five - heat forging deformation treatment is further subjected to a double annealing process: a double annealing process of the medium - temperature for the first annealing and the low - temperature for the second annealing is adopted for the forging:

[0025] The technological process of the first annealing is as follows: two drawing and two upsetting are carried out at a medium - temperature of 600 - 700 °C, then heat preservation is carried out for 1 - 1.5 h, furnace cooling to 500 - 550 °C, air cooling, and heat preservation for 1 - 1.5 h;

[0026] The technological process of the second annealing is as follows: two drawing and two upsetting are carried out at a low - temperature of 400 - 540 °C, then heat preservation is carried out for 1 - 1.5 h, air cooling to 200 - 300 °C, and a nickel - iron - chromium alloy forging with secondary forging deformation is obtained;

[0027] Step eight: Rough machining is carried out on the obtained forging;

[0028] Furthermore, in step one, the vacuum induction furnace is heated to 1900 - 2100 °C and heat preservation is carried out for 1 - 3 h.

[0029] Furthermore, in step four, melt ultrasonic treatment is carried out at 850 - 1200 °C with a cooling rate of 3 - 4 °C / s.

[0030] Furthermore, step five is specifically as follows: According to the final size and shape of the alloy forging to be prepared, the weight and size of the nickel - iron - chromium alloy casting in step four are accurately calculated, and the nickel - iron - chromium alloy casting in step four is cut into appropriate blanks by means of cold shearing blanking.

[0031] Furthermore, in step eight, rough machining of the forging is carried out by means of grinding machining.

[0032] Furthermore, it also includes step nine: Mechanical property testing is carried out on the end face of the processed forging.

[0033] The beneficial effects of the present invention compared with the prior art are as follows:

[0034] The present invention reduces the usage of phosphorus, sulfur, and nickel, effectively reduces the corrosion of the alloy, and reduces the cost;

[0035] The present invention adopts a five - heat forging process: The obtained effect is basically equivalent to the effect obtained by forging and deforming the alloy by an eight - heat forging process;

[0036] The present invention adopts a double annealing process: the effect of forging deformation treatment of forgings with the medium temperature of the first annealing and the low temperature of the second annealing is basically equivalent to that of forging deformation treatment of forgings with the high temperature of the first annealing and the low temperature of the second annealing;

[0037] The present invention significantly enhances the performance of nickel-iron-chromium alloy forgings by irradiating nickel-iron-chromium alloy castings with high-intensity pulsed electron beams. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] Embodiment 1:

[0040] This embodiment provides nickel-iron-chromium alloy forgings with low sulfur and phosphorus, and a production process for nickel-iron-chromium alloy forgings with low sulfur and phosphorus, including the following steps:

[0041] Step 1: Put nickel powder, tin ingots, ruthenium chloride, ferrochromium alloy and iron powder into a vacuum induction furnace for melting, heat the vacuum induction furnace to 1900 °C, and keep it warm for 3 h to melt and mix the materials evenly to obtain a nickel-iron-chromium alloy melt;

[0042] Step 2: Cast the obtained nickel-iron-chromium alloy melt by investment casting to obtain a preliminary nickel-iron-chromium alloy casting;

[0043] Step 3: Irradiate the preliminary nickel-iron-chromium alloy casting once with a high-intensity pulsed electron beam with an energy density of 6.2 J / cm 2 , a pulse width of 2.4 μs, for 15 s each time;

[0044] Step 4: Perform melt ultrasonic treatment on the irradiated nickel-iron-chromium alloy casting at 850 °C with a cooling rate of 3 °C / s to obtain a homogenized nickel-iron-chromium alloy casting;

[0045] Step 5: Then, according to the final dimensions and shape of the alloy forgings to be prepared, accurately calculate the weight and dimensions of the nickel-iron-chromium alloy casting in Step 4, and cut the nickel-iron-chromium alloy casting in Step 4 into appropriate blanks by cold shearing;

[0046] Step 6: Perform forging deformation treatment on the blank by using five forging heats:

[0047] First, the blank is forged in two heating processes above the phase transformation point (700 - 800 °C):

[0048] The technological process of the first heating forging is as follows: triple drawing and triple upsetting are carried out at 882 °C, and then it is kept at 822 °C for 100 min;

[0049] The technological process of the second heating forging is as follows: double drawing and double upsetting are carried out at 832 °C, and then it is kept at 822 °C for 100 min;

[0050] Then, the blank is forged in three heating processes below the phase transformation point (700 - 800 °C):

[0051] The technological process of the third heating forging is as follows: triple drawing and triple upsetting are carried out at 720 °C, and then it is kept at 720 °C for 280 min;

[0052] The technological process of the fourth heating forging is as follows: double drawing and double upsetting are carried out at 720 °C, and then it is kept at 720 °C for 280 min;

[0053] The technological process of the fifth heating forging is as follows: single drawing and single upsetting are carried out at 720 °C, and then it is kept at 720 °C for 280 min. After five heating forging processes, a forging with preliminary forging deformation is obtained;

[0054] Step Seven: The preliminary forging obtained through five heating forging deformations is further subjected to a double annealing process: a double annealing process of one-time annealing at medium temperature and two-time annealing at low temperature is adopted:

[0055] The technological process of one-time annealing is as follows: double drawing and double upsetting are carried out at a medium temperature of 600 °C, then it is kept for 1.5 h, furnace-cooled to 550 °C, air-cooled, and kept for 1.5 h;

[0056] The technological process of two-time annealing is as follows: double drawing and double upsetting are carried out at a low temperature of 400 °C, then it is kept for 1.5 h, air-cooled to 300 °C, and a nickel-iron-chromium alloy forging with secondary forging deformation is obtained;

[0057] Step Eight: The obtained forging is rough-machined;

[0058] Preferably, the forging is rough-machined by grinding;

[0059] Step Nine: The mechanical properties of the end face of the machined forging are detected. The high-temperature tensile properties, high-temperature creep properties, fracture toughness, plasticity, etc. of the forging are detected.

[0060] The obtained nickel-iron-chromium alloy forging with low sulfur and phosphorus is subjected to component detection: sulfur 0.005%, phosphorus 0.015%, nickel 9.6%, tin 7.6%, ruthenium 0.008%, chromium 17.3%, and the balance is iron. The sum of the mass percentages of the above components is 100%.

[0061] Example 2:

[0062] This example provides a nickel-iron-chromium alloy forging with low sulfur and phosphorus and a production process for the nickel-iron-chromium alloy forging with low sulfur and phosphorus, including the following steps:

[0063] Step 1: Put nickel powder, tin ingot, ruthenium chloride, ferrochromium alloy, and iron powder into a vacuum induction furnace for melting. Heat the vacuum induction furnace to 2100 °C and keep it warm for 1 h to melt and mix the materials evenly to obtain a nickel-iron-chromium alloy melt;

[0064] Step 2: Cast the obtained nickel-iron-chromium alloy melt by investment casting to obtain a preliminary nickel-iron-chromium alloy casting;

[0065] Step 3: Irradiate the preliminary nickel-iron-chromium alloy casting 3 times with a high-current pulsed electron beam with an energy density of 6.6 J / cm 2 , a pulse width of 2.1 μs, and each irradiation for 5 s;

[0066] Step 4: Perform melt ultrasonic treatment on the irradiated nickel-iron-chromium alloy casting at 1200 °C with a cooling rate of 4 °C / s to obtain a homogenized nickel-iron-chromium alloy casting;

[0067] Step 5: Then, according to the final size and shape of the alloy forging to be prepared, accurately calculate the weight and size of the nickel-iron-chromium alloy casting in Step 4, and cut the nickel-iron-chromium alloy casting in Step 4 into appropriate blanks by cold shearing blanking;

[0068] Step 6: Perform forging deformation treatment on the blank by five forging heats:

[0069] First, perform two forging heats on the blank above the phase transformation point (700 - 800 °C):

[0070] The technological process of the first forging heat is: perform three draws and three upsets at 898 °C, and then keep it warm at 838 °C for 90 min;

[0071] The technological process of the second forging heat is: perform two draws and two upsets at 848 °C, and then keep it warm at 838 °C for 90 min;

[0072] Then, perform three forging heats on the blank below the phase transformation point (700 - 800 °C):

[0073] The technological process of the third forging is as follows: three draws and three upsets are carried out at 780 °C, and then it is kept at 780 °C for 180 min;

[0074] The technological process of the fourth forging is as follows: two draws and two upsets are carried out at 780 °C, and then it is kept at 780 °C for 180 min;

[0075] The technological process of the fifth forging is as follows: one draw and one upset are carried out at 780 °C, and then it is kept at 780 °C for 180 min. After five times of forging, a forging with preliminary forging deformation is obtained;

[0076] Step seven: The preliminary forging obtained by the five - time forging deformation treatment is further subjected to a double annealing process: a double annealing process of one - time annealing at medium temperature and two - time annealing at low temperature is adopted for the forging:

[0077] The technological process of the one - time annealing is as follows: two draws and two upsets are carried out at a medium temperature of 700 °C, then it is kept warm for 1 h, cooled in the furnace to 500 °C, air - cooled, and kept warm for 1 h;

[0078] The technological process of the two - time annealing is as follows: two draws and two upsets are carried out at a low temperature of 540 °C, then it is kept warm for 1 h, air - cooled to 200 °C, and a nickel - iron - chromium alloy forging with secondary forging deformation is obtained;

[0079] Step eight: Rough - machine the obtained forging;

[0080] Preferably, the forging is rough - machined by grinding;

[0081] Step nine: Conduct mechanical property tests on the end face of the machined forging. Test the high - temperature tensile property, high - temperature creep property, fracture toughness, plasticity, etc. of the forging.

[0082] Conduct component tests on the obtained nickel - iron - chromium alloy forging with low sulfur and phosphorus: sulfur 0.008%, phosphorus 0.012%, nickel 10.5%, tin 4.5%, ruthenium 0.016%, chromium 15.1%, and the balance is iron. The sum of the mass percentages of the above components is 100%.

[0083] Example 3:

[0084] This example provides a nickel - iron - chromium alloy forging with low sulfur and phosphorus and a production process of the nickel - iron - chromium alloy forging with low sulfur and phosphorus, including the following steps:

[0085] Step one: Put nickel powder, tin ingot, ruthenium chloride, ferrochromium alloy and iron powder into a vacuum induction furnace for melting. Heat the vacuum induction furnace to 2000 °C and keep it warm for 2 h to make the materials melt and mix evenly, obtaining a nickel - iron - chromium alloy melt;

[0086] Step 2: Cast the obtained nickel-iron-chromium alloy molten liquid by investment casting to obtain a preliminary nickel-iron-chromium alloy casting;

[0087] Step 3: Irradiate the preliminary nickel-iron-chromium alloy casting with a high-current pulsed electron beam having an energy density of 6.4 J / cm 2 , a pulse width of 2.3 μs, for 2 times, with each irradiation for 10 s;

[0088] Step 4: Perform melt ultrasonic treatment on the irradiated nickel-iron-chromium alloy casting at 1000 °C with a cooling rate of 3.5 °C / s to obtain a homogenized nickel-iron-chromium alloy casting;

[0089] Step 5: Then, according to the final dimensions and shape of the alloy forging to be prepared, accurately calculate the weight and dimensions of the nickel-iron-chromium alloy casting in Step 4, and cut the nickel-iron-chromium alloy casting in Step 4 into appropriate blanks by cold shearing blanking;

[0090] Step 6: Perform forging deformation treatment on the blank by five-pass forging:

[0091] First, perform two-pass forging on the blank above the phase transformation point (700 - 800 °C):

[0092] The process flow of the first-pass forging is: perform three draws and three upsets at 890 °C, and then hold for 95 min at 830 °C;

[0093] The process flow of the second-pass forging is: perform two draws and two upsets at 840 °C, and then hold for 95 min at 830 °C;

[0094] Then, perform three-pass forging on the blank below the phase transformation point (700 - 800 °C):

[0095] The process flow of the third-pass forging is: perform three draws and three upsets at 750 °C, and then hold for 240 min at 750 °C;

[0096] The process flow of the fourth-pass forging is: perform two draws and two upsets at 750 °C, and then hold for 240 min at 750 °C;

[0097] The process flow of the fifth-pass forging is: perform one draw and one upset at 750 °C, and then hold for 240 min at 750 °C. After five-pass forging, obtain a forging with preliminary forging deformation;

[0098] Step 7: Continue to perform double annealing process treatment on the preliminary forging obtained by five-pass forging deformation treatment: adopt a double annealing process treatment of performing one annealing at medium temperature and two annealing at low temperature on the forging;

[0099] The technological process of primary annealing is as follows: two drawing and two upsetting are carried out at a medium temperature of 650 °C, then heat preservation is carried out for 1.3 h, furnace cooling to 525 °C, air cooling, and heat preservation for 1.3 h;

[0100] The technological process of secondary annealing is as follows: two drawing and two upsetting are carried out at a low temperature of 470 °C, then heat preservation is carried out for 1.3 h, air cooling to 240 °C, and a nickel-iron-chromium alloy forging with secondary forging deformation is obtained;

[0101] Step eight: Rough machine the obtained forgings;

[0102] Preferably, the forgings are rough machined by grinding;

[0103] Step nine: Carry out mechanical property testing on the end face of the machined forgings. Test the high-temperature tensile property, high-temperature creep property, fracture toughness, plasticity, etc. of the forgings.

[0104] Conduct component testing on the obtained nickel-iron-chromium alloy forgings with low sulfur and phosphorus: sulfur 0.006%, phosphorus 0.14%, nickel 10.1%, tin 5.3%, ruthenium 0.01%, chromium 16%, and the balance is iron. The sum of the mass percentages of the above components is 100%.

[0105] Comparative example 1: Different from Example 3: Step six: The blank is subjected to forging deformation treatment with 8 fire times of forging:

[0106] First, carry out four fire times of forging on the blank above the phase transformation point (700 - 800 °C):

[0107] The technological process of the 1st fire time is as follows: three drawing and three upsetting are carried out at 900 °C, and then heat preservation is carried out at 840 °C for 110 min;

[0108] The technological process of the 2nd fire time is as follows: two drawing and two upsetting are carried out at 880 °C, and then heat preservation is carried out at 840 °C for 110 min;

[0109] The technological process of the 3rd fire time is as follows: two drawing and two upsetting are carried out at 860 °C, and then heat preservation is carried out at 840 °C for 110 min;

[0110] The technological process of the 4th fire time is as follows: two drawing and two upsetting are carried out at 840 °C, and then heat preservation is carried out at 840 °C for 110 min;

[0111] Then, carry out four fire times of forging on the blank below the phase transformation point (700 - 800 °C):

[0112] The technological process of the 5th fire time is as follows: three drawing and three upsetting are carried out at 740 °C, and then heat preservation is carried out at 740 °C for 220 min;

[0113] The technological process of the 6th fire time is as follows: two drawing and two upsetting are carried out at 740 °C, and then heat preservation is carried out at 740 °C for 220 min;

[0114] The technological process of the 7th heat treatment is as follows: one drawing and one upsetting are carried out at 740 °C, and then at 740 °C, it is heat-insulated for 220 min, and then passed

[0115] The technological process of the 8th heat treatment is as follows: one drawing and one upsetting are carried out at 740 °C, and then at 740 °C, it is heat-insulated for 220 min. After forging through eight heat treatments, a forging with preliminary forging deformation is obtained.

[0116] Comparative Example 2: Different from Example 3: Step seven: The preliminary forging obtained by forging deformation treatment through five heat treatments is further subjected to a double annealing process: A double annealing process of one-time annealing at a high temperature and two-time annealing at a low temperature is adopted for the forging:

[0117] The technological process of one-time annealing is as follows: Two drawings and two upsetting are carried out at a high temperature of 960 °C, and then it is heat-insulated for 1.6 h, furnace-cooled to 660 °C, air-cooled, and heat-insulated for 1.6 h;

[0118] The technological process of two-time annealing is as follows: Two drawings and two upsetting are carried out at a low temperature of 600 °C, and then it is heat-insulated for 1.6 h, air-cooled to 400 °C, and a nickel-iron-chromium alloy forging with secondary forging deformation is obtained;

[0119] Comparative Example 3: Different from Example 3: Step three is not carried out.

[0120] Experimental Example: The nickel-iron-chromium alloy forgings prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to performance tests (GB / T228.1-2021, GB / T 231.1-2018), and the results are shown in Table 1.

[0121] Table 1 Performance test results

[0122]

[0123]

[0124] It can be seen from Table 1 that the effect obtained by forging and deforming the alloy through the 8-heat-treatment forging process in Comparative Example 1 is basically equivalent to the effect obtained by the 5-heat-treatment forging process in Example 3; the effect of forging and deforming the forging through one-time annealing at a high temperature and two-time annealing at a low temperature in Comparative Example 2 is basically equivalent to the effect of forging and deforming the forging through one-time annealing at a medium temperature and two-time annealing at a low temperature in Example 3; the difference between not irradiating the nickel-iron-chromium alloy casting with a high-current pulsed electron beam in Comparative Example 3 and irradiating the nickel-iron-chromium alloy casting with a high-current pulsed electron beam in Example 3 is significant, and irradiating the nickel-iron-chromium alloy casting with a high-current pulsed electron beam significantly enhances the performance of the nickel-iron-chromium alloy forging.

[0125] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nickel-iron-chromium alloy forging with low sulfur and phosphorus, characterized in that, By mass percentage, it consists of the following components: sulfur 0.005 - 0.008%, phosphorus 0.012 - 0.015%, nickel 9.6 - 10.5%, tin 4.5 - 7.6%, ruthenium 0.008 - 0.016%, chromium 15.1 - 17.3%, and the balance is iron, and the sum of the mass percentages of the above components is 100%.

2. The low-sulfur and low-phosphorus nickel-iron-chromium alloy forging according to claim 1, wherein The nickel, tin, ruthenium, chromium and iron are derived from nickel powder, tin ingot, ruthenium chloride, ferrochrome alloy and iron powder in sequence.

3. The production process of the low-sulfur and low-phosphorus nickel-iron-chromium alloy forging according to claim 1, characterized in that, It includes the following steps: Step 1: Put nickel powder, tin ingot, ruthenium chloride, ferrochrome alloy and iron powder into a vacuum induction furnace for melting, so that the materials are melted and mixed evenly to obtain a molten nickel-iron-chromium alloy liquid. Step 2: Cast the obtained molten nickel-iron-chromium alloy liquid by investment casting method to obtain a preliminary nickel-iron-chromium alloy casting. Step 3: Irradiate the preliminary nickel-iron-chromium alloy casting 1 to 3 times with a high-current pulsed electron beam having an energy density of 6.2 to 6.6 J / cm 2 , a pulse width of 2.1 to 2.4 μs, for 5 to 15 s each time; Step 4: Perform melt ultrasonic treatment on the irradiated nickel-iron-chromium alloy casting to obtain a homogenized nickel-iron-chromium alloy casting. Step 5: Cut the nickel-iron-chromium alloy casting in Step 4 into appropriate blanks. Step 6: Perform forging deformation treatment on the blank by five-pass forging: First, perform two-pass forging on the blank above the phase transformation point: The process flow of the first-pass forging is: perform three draws and three upsets at 890 ± 8°C, and then keep it at 830 ± 8°C for 90 - 100 min. The process flow of the second-pass forging is: perform two draws and two upsets at 840 ± 8°C, and then keep it at 830 ± 8°C for 90 - 100 min. Then perform three-pass forging on the blank below the phase transformation point: The process flow of the third-pass forging is: perform three draws and three upsets at 750 ± 30°C, and then keep it at 750 ± 30°C for 180 - 280 min. The process flow of the fourth-pass forging is: perform two draws and two upsets at 750 ± 30°C, and then keep it at 750 ± 30°C for 180 - 280 min. The process flow of the fifth-pass forging is: perform one draw and one upset at 750 ± 30°C, and then keep it at 750 ± 30°C for 180 - 80 min. After five-pass forging, an initially forged and deformed forging is obtained. Step 7: Continue to perform a double annealing process on the initially forged part obtained by five-pass forging deformation treatment: adopt a double annealing process of performing one annealing at medium temperature and two annealing at low temperature on the forging: The process flow of the first annealing is: perform two draws and two upsets at a medium temperature of 600 - 700°C, then keep it warm for 1 - 1.5 h, cool it in the furnace to 500 - 550°C, air-cool it, and keep it warm for 1 - 1.5 h. The process flow of the second annealing is: perform two draws and two upsets at a low temperature of 400 - 540°C, then keep it warm for 1 - 1.5 h, air-cool it to 200 - 300°C to obtain a nickel-iron-chromium alloy forging with secondary forging deformation. Step 8: Rough machine the obtained forging.

4. The production process of the low sulfur and phosphorus nickel-iron-chromium alloy forging according to claim 3, characterized in that, In Step 1, heat the vacuum induction furnace to 1900 - 2100°C and keep it warm for 1 - 3 h.

5. The production process of the low-sulfur and low-phosphorus nickel-iron-chromium alloy forging according to claim 3, characterized in that, In Step 4, perform melt ultrasonic treatment at 850 - 1200°C with a cooling rate of 3 - 4°C / s.

6. The production process of the low-sulfur and low-phosphorus nickel-iron-chromium alloy forging according to claim 3, characterized in that, Step five specifically is: Further, according to the final dimensions and shape of the alloy forging to be prepared, accurately calculate the weight and dimensions of the nickel-iron-chromium alloy casting in the fourth step, and cut the nickel-iron-chromium alloy casting in the fourth step into appropriate blanks by means of cold shearing blanking.

7. The production process of the nickel-iron-chromium alloy forging with low sulfur and phosphorus according to claim 3, characterized in that, In step eight, rough machining of the forging is carried out by means of grinding.

8. The production process of the low-sulfur and low-phosphorus nickel-iron-chromium alloy forging according to claim 3, characterized in that, It further includes step nine: performing mechanical property testing on the end face of the machined forging.

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