CN114378234B - NS3303 corrosion-resistant alloy and forging method thereof - Google Patents
NS3303 corrosion-resistant alloy and forging method thereof Download PDFInfo
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- CN114378234B CN114378234B CN202111041938.4A CN202111041938A CN114378234B CN 114378234 B CN114378234 B CN 114378234B CN 202111041938 A CN202111041938 A CN 202111041938A CN 114378234 B CN114378234 B CN 114378234B
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- 230000007797 corrosion Effects 0.000 title claims abstract description 123
- 238000005260 corrosion Methods 0.000 title claims abstract description 123
- 238000005242 forging Methods 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000000956 alloy Substances 0.000 title claims abstract description 38
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 106
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 84
- 238000000137 annealing Methods 0.000 claims abstract description 15
- 238000009792 diffusion process Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 79
- 239000010959 steel Substances 0.000 claims description 79
- 238000001816 cooling Methods 0.000 claims description 32
- 238000004321 preservation Methods 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims description 14
- 229910001018 Cast iron Inorganic materials 0.000 claims description 8
- 238000005204 segregation Methods 0.000 abstract description 13
- 210000001787 dendrite Anatomy 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 description 11
- 230000008646 thermal stress Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 229910000601 superalloy Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The invention provides an NS3303 corrosion-resistant alloy and a forging method thereof, belonging to the technical field of metal processing. According to the forging method, dendrite in the prepared forging piece is disappeared, carbide is not contained, element segregation is basically eliminated through sectional heating, diffusion annealing, cogging and twice forging, the problem that a product is easy to crack in forging production due to poor hot working performance of an NS3303 corrosion-resistant alloy steel ingot is solved, the yield of the forging piece is improved, and the yield of the forging piece is increased to 98%.
Description
Technical Field
The invention relates to the technical field of metal processing, in particular to an NS3303 corrosion-resistant alloy steel ingot and a forging method thereof.
Background
The NS3303 corrosion-resistant alloy has excellent corrosion resistance in various corrosion mediums and is widely applied to the fields of chemical industry and petrochemical industry. The material is especially suitable for use in high temperature, mixed inorganic acid and organic acid (such as formic acid and acetic acid), sea water corrosive environment.
However, the NS3303 corrosion-resistant alloy contains a very high content of Mo, W, cr, fe element and a certain amount of C element, and element segregation and a large amount of carbide (M6C, M2C, M23C 6) precipitate during the solidification process of the steel ingot, so that the deformation resistance of the NS333 corrosion-resistant alloy is high, the phenomenon of forging cracking is often generated, and huge economic loss is caused. In addition, the NS3303 corrosion-resistant alloy has low heat conductivity coefficient and large linear expansion coefficient, and has large temperature gradient of the surface and the core of the steel ingot and large thermal stress in the forging heating process, thereby causing the heating cracking phenomenon.
Disclosure of Invention
The invention solves the problem of providing a forging method for improving the hot processing performance of NSNS3303 corrosion-resistant alloy steel ingots, reducing the cracking problem of products in the forging production of the NS3303 corrosion-resistant alloy steel ingots and improving the yield.
In order to solve the problems, the technical scheme adopted by the invention is as follows.
A method of forging an NS3303 corrosion resistant alloy, comprising the steps of:
s1, placing steel ingots: placing an NS3303 corrosion-resistant alloy steel ingot on cast iron;
s2, heating in a sectional mode: heating in the first stage, heating the NS3303 corrosion-resistant alloy steel ingot in the step S1 to 590-610 ℃, and preserving heat for 4-6 h; heating in the second stage, heating to 890-910 deg.c at the heating rate of 1-3 deg.c/min and maintaining for 2-3 hr;
s3, diffusion annealing: heating the NS3303 corrosion-resistant alloy steel ingot subjected to the step S2 to 1170-1190 ℃ at a heating rate of 2-4 ℃/min, and then preserving heat for 8-12 h;
s4, cooling the steel ingot: cooling the NS3303 corrosion-resistant alloy steel ingot subjected to the step S3 to 1135-1155 ℃ at a cooling rate of 1-2 ℃/min;
s5, heat preservation of steel ingots: the NS3303 corrosion-resistant alloy steel ingot subjected to the step S4 is subjected to heat preservation for 2 to 4 hours at the temperature of 1135 to 1155 ℃;
s6, cogging of steel ingots: forging and cogging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S5, and discharging the steel ingot for cogging, wherein the final forging temperature is higher than 1000 ℃;
s7, returning and heating the steel ingot: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S6 to heat, wherein the heating temperature is 1170-1190 ℃, and the heat is preserved for 2-4 hours;
s8, forging steel ingots: discharging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S7, and performing unidirectional flattening to ensure that the deformation of the NS3303 corrosion-resistant alloy steel ingot is 20-30%;
s9, secondary furnace returning and heating of steel ingots: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S8 to heat, wherein the heating temperature is 1170-1190 ℃, and the heat is preserved for 2-4 hours;
s10, secondary forging of steel ingots: the NS3303 corrosion resistant alloy ingot, which completes the step S9, is forged into a billet.
Compared with the prior art, the forging method of the NS3303 corrosion-resistant alloy reduces the temperature difference between the surface and the core of the steel ingot by gradually and slowly heating, reduces the thermal stress, and can avoid the risk of cracking of the NS3303 corrosion-resistant alloy steel ingot caused by the thermal stress. The element segregation is homogenized through diffusion annealing, and carbide in the grain boundary can be dissolved back into crystal grains, so that the carbide in the NS3303 corrosion-resistant alloy steel ingot is basically eliminated. In addition, the forging method reduces the deformation resistance of the material through diffusion annealing and increases the plasticity of the NS3303 corrosion-resistant alloy. In addition, the cooling process in the forging method increases the high-temperature strength of the NS3303 corrosion-resistant alloy steel ingot and prevents the surface from cracking during forging and cogging. And finally, dendrites in the NS3303 corrosion-resistant alloy steel ingot treated by the method disappear, no carbide exists, and element segregation is basically eliminated.
Preferably, the temperature of the first heating stage in the step S2 is 600 ℃, and the heat preservation time is 4 hours; by optimizing the temperature and the heat preservation time in the step S2, the process conditions are adapted to the NS3303 corrosion-resistant alloy, so that the thermal stress generated in the heating process of the superalloy can be eliminated to the maximum extent, and the risk of cracking of the superalloy material is reduced to the maximum extent.
Preferably, in the step S3, the heating rate is 2 ℃/min, the temperature is 1180 ℃, and the heat preservation time is 10h. Through optimizing the technological parameters in the step S3, the internal segregation elements of the NS3303 corrosion-resistant alloy material can be uniform, and the GH5188 superalloy has the best hot working performance
Preferably, the cooling rate in the step S4 is 1 ℃/min, and the temperature is reduced to 1145 ℃. By optimizing the process parameters in the step S4, the NS3303 corrosion-resistant alloy material has higher high-temperature strength and better prevents surface cracking during forging and cogging.
Preferably, the temperature of the heat preservation in the step S5 is 1145 ℃ and the heat preservation time is 3h. By optimizing the process parameters in step S5, the temperatures of the surface and the interior of the NS3303 corrosion-resistant alloy material can be further made uniform.
Preferably, the heating temperature in the step S7 is 1180 ℃ and the holding time is 3h. By optimizing the process parameters in step S7, the NS3303 corrosion resistant alloy material may be made more suitable for the requirements of the forging process.
Preferably, the heating temperature in the step S9 is 1180 ℃ and the holding time is 3h. By optimizing the process parameters in step S7, the NS3303 corrosion-resistant alloy material can be more suitable for the secondary forging process
The invention also provides an NS3303 corrosion-resistant alloy which is obtained by forging by adopting the forging method. Dendrites in the NS3303 corrosion-resistant alloy obtained by forging through the forging method disappear, no carbide exists, element segregation is basically eliminated, the alloy is qualified through ultrasonic flaw detection test, and the yield is improved to 98%.
Drawings
FIG. 1 is a graph showing the heat treatment temperatures of steps S1 to S5 in a forging method of an NS3303 corrosion-resistant alloy ingot.
FIG. 2 is a graph of forging temperatures of step S6 and step S7 in a forging method of an NS3303 corrosion-resistant alloy ingot.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A method of forging an NS3303 corrosion resistant alloy, comprising the steps of:
the heat treatment temperature curves of the steps S1 to S5 in the forging process are shown in FIG. 1, wherein T in FIG. 1 represents the temperature, and T1, T2, T3 and T4 respectively represent the first-stage heating temperature, the secondary heating temperature, the diffusion annealing temperature and the cooling temperature; in fig. 1, t represents time, and t1, t2, t3, t4, t5, t6 and t7 represent time used in different phases, respectively.
The heat treatment temperature curves of steps S1 to S5 in the forging process are shown in FIG. 2, wherein T in FIG. 2 represents time, and T5 represents forging heating temperature; in FIG. 1, t represents time, and t8 represents forging heat retaining time.
S1, placing steel ingots: the NS3303 corrosion resistant alloy steel ingot is cushioned on cast iron with the thickness of 250mm and 1000 mm; and the NS3303 corrosion-resistant alloy cast ingot is padded on cast iron, so that the steel ingot is heated uniformly.
The compositions of the NS3303 corrosion resistant alloy are shown in table 1.
TABLE 1 composition of NS3303 corrosion resistant alloy
| Element(s) | Ni | Cr | Mo | W | Fe | C | Si | Mn |
| Content of | Allowance of | 14.5～16.5 | 15～17 | 3.0～4.5 | 4.0～7.0 | ≤0.08 | ≤1.0 | ≤1.0 |
| Element(s) | S | P | Co | V | ||||
| Content of | ≤0.03 | ≤0.04 | ≤2.5 | ≤0.35 |
S2, heating in a sectional mode: heating in the first stage, and heating the NS3303 corrosion-resistant alloy steel ingot pad in the step S1 to T1: heat preservation t1 at 590-610 ℃): 4-6 h; heating in the second stage, and heating to T2 at a heating rate of 1-3 ℃/min in the time of T2: after 890-910 ℃, preserving heat at t3: 2-3 h; the temperature difference between the surface and the core of the steel ingot is reduced by slowly heating in a sectionalized way, so that the thermal stress is reduced, and the risk of cracking of the NS3303 corrosion-resistant alloy steel ingot caused by the thermal stress of the material can be avoided.
S3, diffusion annealing: heating the NS3303 corrosion-resistant alloy steel ingot subjected to the step S2 to T3 at the heating rate of 2-4 ℃/min in the time of T4: heat preservation t5 after 1170-1190℃: 8-12 h; homogenizing element segregation by diffusion annealing; in addition, the diffusion annealing can also enable carbide in the grain boundary to be dissolved back into grains, reduce the deformation resistance of the material and increase the plasticity of the NS3303 corrosion-resistant alloy.
S4, cooling the steel ingot: cooling the NS3303 corrosion-resistant alloy steel ingot subjected to the step S3 to T4 at a cooling rate of 1-2 ℃/min in a time of T6: 1135-1155 deg.c. The high-temperature strength of the NS3303 corrosion-resistant alloy steel ingot can be improved by cooling, and surface cracking during forging and cogging is prevented;
s5, heat preservation of steel ingots: the NS3303 corrosion resistant alloy steel ingot which completes the step S4 is processed at the temperature of T4: at 1135-1155 ℃, preserving heat at t7: 2-4 h; the temperature of the NS3303 corrosion-resistant alloy steel ingot can be uniform and consistent through heat preservation treatment.
S6, cogging of steel ingots: forging and cogging the NS3303 corrosion-resistant alloy steel ingot which is finished in the step S4 at the time of t8, and discharging and cogging the steel ingot, wherein the final forging temperature is higher than 1000 ℃; at 1000-1145 deg.c, the steel ingot has optimal plasticity, and the surface grains may be crushed with small deformation.
S7, returning and heating the steel ingot: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S5 to heat, wherein the heating temperature is T5: 1170-1190 ℃, preserving heat at t8: 2-4 h; the temperature of the NS3303 corrosion-resistant alloy steel ingot is increased by the back-furnace heating, so that the steel ingot is suitable for forging.
S8, forging steel ingots: discharging the NS3303 corrosion-resistant alloy steel ingot which is finished in the step S6, and performing unidirectional flattening to ensure that the deformation of the NS3303 corrosion-resistant alloy steel ingot is 20-30%; refining surface grains of steel ingot by forging, and increasing high-temperature plasticity of steel ingot
S9, secondary furnace returning and heating of steel ingots: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S7 to heat, wherein the heating temperature is T5: 1170-1190 ℃, preserving heat at t8: 2-4 h; the temperature of the NS3303 corrosion-resistant alloy steel ingot is increased by the return furnace heating, so that the steel ingot is suitable for secondary forging.
S10, secondary forging of steel ingots: the NS3303 corrosion resistant alloy ingot, which completes step S9, is forged into a billet. Forging the steel ingot of the NS3303 corrosion-resistant alloy into a blank can facilitate the subsequent utilization of the NS3303 corrosion-resistant alloy.
Compared with the prior art, the forging method of the NS3303 corrosion-resistant alloy steel ingot reduces the temperature difference between the surface and the core of the steel ingot by gradually and slowly heating, reduces the thermal stress, and can avoid the risk of cracking of the NS3303 corrosion-resistant alloy steel ingot caused by the thermal stress. The element segregation is homogenized through diffusion annealing, and carbide in the grain boundary can be dissolved back into crystal grains, so that the carbide in the NS3303 corrosion-resistant alloy steel ingot is basically eliminated. In addition, the forging method reduces the deformation resistance of the material through diffusion annealing and increases the plasticity of the NS3303 corrosion-resistant alloy. In addition, the cooling process in the forging method increases the high-temperature strength of the NS3303 corrosion-resistant alloy steel ingot and prevents the surface from cracking during forging and cogging. And finally, dendrites in the NS3303 corrosion-resistant alloy steel ingot treated by the method disappear, no carbide exists, and element segregation is basically eliminated.
Example 1 square forging of size 200mm*300mm*2000mm NS333
S1, placing steel ingots: a steel ingot cushion of NS3303 corrosion-resistant alloy with the diameter of 480mm is arranged on cast iron with the diameter of 250mm and 1000 mm;
s2, heating in a sectional mode: heating in the first stage, namely heating the NS3303 corrosion-resistant alloy steel ingot pad in the step S1 to 600 ℃, and preserving heat for 5 hours; heating in the second stage, heating to 900 ℃ at a heating rate of 2 ℃/min, and preserving heat for 3 hours;
s3, diffusion annealing: heating the NS3303 corrosion-resistant alloy steel ingot subjected to the step S2 to 1190 ℃ at a heating rate of 3 ℃/min, and then preserving heat for 10 hours;
s4, cooling the steel ingot: cooling the NS3303 corrosion-resistant alloy steel ingot subjected to the step S3 to 1140 ℃ at a cooling rate of 1 ℃/min;
s5, heat preservation of steel ingots: the NS3303 corrosion-resistant alloy steel ingot which is subjected to the step S4 is subjected to heat preservation for 3 hours at 1140 ℃;
s6, cogging of steel ingots: forging and cogging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S5, and discharging and cogging the steel ingot, wherein the forging specification is 420mm x 480mm x L, and the final forging temperature is more than 1000 ℃;
s7, returning and heating the steel ingot: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S6 to heat, wherein the heating temperature is 1180 ℃, and the heat is preserved for 3 hours;
s8, forging steel ingots: discharging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S7, and performing unidirectional flattening, wherein the forging specification is 200mm x 420mm x L;
s9, secondary furnace returning and heating of steel ingots: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S8 to heat, wherein the heating temperature is 1180 ℃, and the heat is preserved for 3 hours;
s10, secondary forging of steel ingots: forging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S9 into a square billet of 200 mm/300 mm/2000 mm, and air-cooling after forging.
The forge piece is detected to be qualified after ultrasonic flaw detection, and through metallographic analysis, dendrites in the forge piece disappear, carbide is avoided, and element segregation is basically eliminated.
Example 2 forging of a 280mm diameter NS3303 round bar
S1, placing steel ingots: a steel ingot cushion of NS3303 corrosion-resistant alloy with the diameter of 480mm is arranged on cast iron with the diameter of 250mm and 1000 mm;
s2, heating in a sectional mode: heating the first section, namely heating the NS3303 corrosion-resistant alloy steel ingot pad in the step S1 to 610 ℃ for 6 hours; heating in the second stage, heating to 910 ℃ at a heating rate of 3 ℃/min, and preserving heat for 3 hours;
s3, diffusion annealing: heating the NS3303 corrosion-resistant alloy steel ingot subjected to the step S2 to 1180 ℃ at a heating rate of 4 ℃/min, and then preserving heat for 12 hours;
s4, cooling the steel ingot: cooling the NS3303 corrosion-resistant alloy steel ingot subjected to the step S3 to 1155 ℃ at a cooling rate of 2 ℃/min;
s5, heat preservation of steel ingots: the NS3303 corrosion-resistant alloy steel ingot which is subjected to the step S4 is subjected to heat preservation for 4 hours at the temperature of 1155 ℃;
s6, cogging of steel ingots: forging and cogging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S5, and discharging and cogging the steel ingot, wherein the forging specification is 420mm x 480mm x Lmm, and the final forging temperature is more than 1000 ℃;
s7, returning and heating the steel ingot: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S6 to heat, wherein the heating temperature is 1190 ℃, and the heat is preserved for 4 hours;
s8, forging steel ingots: discharging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S7, and performing unidirectional flattening, wherein the forging specification is 280mm x L, and the final forging temperature is greater than 980 ℃;
s9, secondary furnace returning and heating of steel ingots: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S8 to heat, wherein the heating temperature is 1190 ℃, and the heat is preserved for 4 hours;
s10, secondary forging of steel ingots: forging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S9 into a round bar with the diameter of 280mm, and performing air cooling after forging.
The forge piece is detected to be qualified after ultrasonic flaw detection, and through metallographic analysis, dendrites in the forge piece disappear, carbide is avoided, and element segregation is basically eliminated.
Example 3 square forging of size 250mm*400mm*1500mm NS333
S1, placing steel ingots: a steel ingot cushion of NS3303 corrosion-resistant alloy with the diameter of 480mm is arranged on cast iron with the diameter of 250mm and 1000 mm;
s2, heating in a sectional mode: heating in the first stage, namely heating the NS3303 corrosion-resistant alloy steel ingot pad in the step S1 to 590 ℃, and preserving heat for 4 hours; heating in the second stage, heating to 890 ℃ at a heating rate of 1 ℃/min, and preserving heat for 2h;
s3, diffusion annealing: heating the NS3303 corrosion-resistant alloy steel ingot subjected to the step S2 to 1170 ℃ at a heating rate of 2 ℃/min, and then preserving heat for 8 hours;
s4, cooling the steel ingot: cooling the NS3303 corrosion-resistant alloy steel ingot subjected to the step S3 to 1135 ℃ at a cooling rate of 1 ℃/min;
s5, heat preservation of steel ingots: the NS3303 corrosion-resistant alloy steel ingot which is subjected to the step S4 is subjected to heat preservation for 2 hours at 1135 ℃;
s6, cogging of steel ingots: forging and cogging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S5, and discharging and cogging the steel ingot, wherein the forging specification is 420mm x 480mm x L, and the final forging temperature is more than 1000 ℃;
s7, returning and heating the steel ingot: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S6 to heat, wherein the heating temperature is 1170 ℃, and the heat is preserved for 2 hours;
s8, forging steel ingots: discharging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S7, and performing unidirectional flattening, wherein the forging specification is 250mm x 400mm x L;
s9, secondary furnace returning and heating of steel ingots: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S8 to heat, wherein the heating temperature is 1170 ℃, and the heat is preserved for 2 hours;
s10, secondary forging of steel ingots: forging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S9 into a square billet with the diameter of 250mm and 400mm and 1500mm, and air cooling after forging.
The forge piece is detected to be qualified after ultrasonic flaw detection, and through metallographic analysis, dendrites in the forge piece disappear, carbide is avoided, and element segregation is basically eliminated.
Example 4 forging of 360mm diameter NS3303 round bar
S1, placing steel ingots: a steel ingot cushion of NS3303 corrosion-resistant alloy with the diameter of 480mm is arranged on cast iron with the diameter of 250mm and 1000 mm;
s2, heating in a sectional mode: heating the first section, namely heating the NS3303 corrosion-resistant alloy steel ingot pad in the step S1 to 605 ℃ for 4 hours; heating in the second stage, heating to 900 ℃ at a heating rate of 3 ℃/min, and preserving heat for 2 hours;
s3, diffusion annealing: heating the NS3303 corrosion-resistant alloy steel ingot subjected to the step S2 to 1190 ℃ at a heating rate of 3 ℃/min, and then preserving heat for 8 hours;
s4, cooling the steel ingot: cooling the NS3303 corrosion-resistant alloy steel ingot subjected to the step S3 to 1145 ℃ at a cooling rate of 2 ℃/min;
s5, heat preservation of steel ingots: preserving heat of the NS3303 corrosion-resistant alloy steel ingot subjected to the step S4 for 4 hours at 1145 ℃;
s6, cogging of steel ingots: forging and cogging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S5, and discharging and cogging the steel ingot, wherein the forging specification is 420mm x 480mm x Lmm, and the final forging temperature is more than 1000 ℃;
s7, returning and heating the steel ingot: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S6 to heat, wherein the heating temperature is 1180 ℃, and the heat is preserved for 3 hours;
s8, forging steel ingots: discharging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S7, and performing unidirectional flattening, wherein the forging specification is 360mm x L, and the final forging temperature is greater than 980 ℃;
s9, secondary furnace returning and heating of steel ingots: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S8 to heat, wherein the heating temperature is 1190 ℃, and the heat is preserved for 4 hours;
s10, secondary forging of steel ingots: forging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S9 into a round rod with the diameter of 360mm, and performing air cooling after the forging is finished.
The forge piece is detected to be qualified after ultrasonic flaw detection, and through metallographic analysis, dendrites in the forge piece disappear, carbide is avoided, and element segregation is basically eliminated.
However, the disclosure is as above, but the scope of the disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the invention.
Claims (8)
1. A method of forging an NS3303 corrosion resistant alloy, comprising the steps of:
s1, placing steel ingots: placing an NS3303 corrosion-resistant alloy steel ingot on cast iron;
s2, heating in a sectional mode: heating in the first stage, heating the NS3303 corrosion-resistant alloy steel ingot in the step S1 to 590-610 ℃, and preserving heat for 4-6 h; heating in the second stage, heating to 890-910 deg.c at the heating rate of 1-3 deg.c/min and maintaining for 2-3 hr;
s3, diffusion annealing: heating the NS3303 corrosion-resistant alloy steel ingot subjected to the step S2 to 1170-1190 ℃ at a heating rate of 2-4 ℃/min, and then preserving heat for 8-12 h;
s4, cooling the steel ingot: cooling the NS3303 corrosion-resistant alloy steel ingot subjected to the step S3 to 1135-1155 ℃ at a cooling rate of 1-2 ℃/min;
s5, heat preservation of steel ingots: the NS3303 corrosion-resistant alloy steel ingot subjected to the step S4 is subjected to heat preservation for 2 to 4 hours at the temperature of 1135 to 1155 ℃;
s6, cogging of steel ingots: forging and cogging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S5, and discharging the steel ingot for cogging, wherein the final forging temperature is higher than 1000 ℃;
s7, returning and heating the steel ingot: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S6 to heat, wherein the heating temperature is 1170-1190 ℃, and the heat is preserved for 2-4 hours;
s8, forging steel ingots: discharging the NS3303 corrosion-resistant alloy steel ingot subjected to the step S7, and performing unidirectional flattening to ensure that the deformation of the NS3303 corrosion-resistant alloy steel ingot is 20-30%;
s9, secondary furnace returning and heating of steel ingots: returning the NS3303 corrosion-resistant alloy steel ingot subjected to the step S8 to heat, wherein the heating temperature is 1170-1190 ℃, and the heat is preserved for 2-4 hours;
s10, secondary forging of steel ingots: the NS3303 corrosion resistant alloy ingot, which completes the step S9, is forged into a billet.
2. The forging method as recited in claim 1, wherein the temperature of the first heating stage in the step S2 is 600 ℃ and the holding time is 4 hours.
3. The forging method as recited in claim 1, wherein the temperature rise rate in the step S3 is 2 ℃/min, the temperature is 1180 ℃, and the holding time is 10 hours.
4. The forging method as recited in claim 1, wherein a cooling rate in the step S4 is 1 ℃/min, and cooling is performed to 1145 ℃.
5. The forging method as recited in claim 1, wherein the holding temperature in the step S5 is 1145 ℃ and the holding time is 3 hours.
6. The forging method as recited in claim 1, wherein the heating temperature in the step S7 is 1180 ℃ and the holding time is 3 hours.
7. The forging method as recited in claim 1, wherein the heating temperature in the step S9 is 1180 ℃ and the holding time is 3 hours.
8. An NS3303 corrosion resistant alloy, which is forged by the forging method according to any one of claims 1 to 7.
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