CN112853079B - Forming method of large-diameter thin-wall high-cylinder type ultra-high strength steel D406A ring forging - Google Patents
Forming method of large-diameter thin-wall high-cylinder type ultra-high strength steel D406A ring forging Download PDFInfo
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- CN112853079B CN112853079B CN202011627330.5A CN202011627330A CN112853079B CN 112853079 B CN112853079 B CN 112853079B CN 202011627330 A CN202011627330 A CN 202011627330A CN 112853079 B CN112853079 B CN 112853079B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005242 forging Methods 0.000 title claims abstract description 21
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 36
- 238000000137 annealing Methods 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000003754 machining Methods 0.000 claims abstract description 12
- 238000004080 punching Methods 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 9
- 238000005496 tempering Methods 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000002994 raw material Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 239000011257 shell material Substances 0.000 description 3
- 229910001567 cementite Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
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- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2261/00—Machining or cutting being involved
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a forming method of a large-diameter thin-wall high-cylinder type ultra-high strength steel D406A ring forging, which belongs to the technical field of high strength steel forming, and is characterized by comprising the following steps: s1: blanking to obtain a blank; s2: upsetting and punching a blank; s3: preparing a blank to obtain a ring blank; s4: ring rolling of the ring blank; s5: heat treatment of the ring blank; s6: performing physical and chemical detection on the ring blank; s7: spheroidizing annealing of the ring blank; s8: rough machining of the ring blank; s9: ultrasonic flaw detection of the ring blank; s10: stress relief annealing of the ring blank; s11: the ring blank is finished, and the precision, the quality stability and the reliability of the ring forging are improved.
Description
Technical Field
The invention relates to the technical field of high-strength steel forming, in particular to a method for forming a large-diameter thin-wall high-cylinder type ultra-high-strength steel D406A ring forging.
Background
D406 is a model of low-alloy ultrahigh-strength steel which is self-designed and developed in China and is widely applied to shell materials of large solid rockets and missile engines, D406A steel is developed on the basis of the high-reliability steel, and toughness is improved by reducing carbon content and smelting technology of double vacuum (VIM+VAR).
With the development of aerospace and novel strategic missiles in China, the large-scale capability, long range, high flight speed and long flight time become the development direction of aerospace weapons, so that the use environment of a D406A forge piece is also increasingly bad, higher requirements are also put forward on the manufacturing technology and quality stability of the D406A ring forge piece, and the large-scale solid rocket engine shell materials in China are mainly D406A large-diameter thin-wall high-cylinder type ring forge pieces (the wall thickness is about 20-30mm and the height is about more than 500 mm) at present, so that extremely harsh requirements are provided for the manufacturing process level and the quality control level of the ring forge pieces.
At present, in the preparation process of the large-size D406A ring forging, a mandrel is pulled out, the number of times of reaming the saddle is more, and the dimensional stability of the formed forging is poor. Therefore, how to formulate the manufacturing technology of the D406A ring forging and ensure the quality stability and the reliability of the D406A ring forging is an urgent problem to be solved in the forging industry at present.
Disclosure of Invention
The invention aims to provide a forming method of a large-diameter thin-wall high-cylinder type ultra-high strength steel D406A ring forging, which has the advantages of improving the accuracy, quality stability and reliability of the ring forging.
The technical aim of the invention is realized by the following technical scheme:
a forming method of a large-diameter thin-wall high-cylinder type ultra-high strength steel D406A ring forging comprises the following steps: the method comprises the following steps: s1: blanking to obtain a blank; s2: upsetting and punching a blank; s3: preparing a blank to obtain a ring blank; s4: ring rolling of the ring blank; s5: heat treatment of the ring blank; s6: performing physical and chemical detection on the ring blank; s7: spheroidizing annealing of the ring blank; s8: rough machining of the ring blank; s9: ultrasonic flaw detection of the ring blank; s10: stress relief annealing of the ring blank; s11: and (5) performing ring blank finish machining.
Further, in the step S7, the ring blank is subjected to spheroidizing annealing, the ring blank is fed into a furnace at the temperature of less than or equal to 400 ℃, is heated to 720 ℃ for heat preservation for 5 hours at the temperature of 200 ℃/h, is heated to 800 ℃ for heat preservation for 4 hours at the temperature of 200 ℃/h, is cooled to 700 ℃ for heat preservation for 20 hours at the temperature of 30 ℃/h, is cooled to 640 ℃ for heat preservation for 6 hours at the temperature of 30 ℃/h, is cooled to 550 ℃ in the furnace, and is discharged from the furnace for air cooling to the room temperature.
Further, in step S2, two steps are included: the first process step: heating the blank to 1080 ℃ in a furnace, and then preserving heat for 120min; and a second step of: upsetting cakes and punching the blank to the size: phi 465+ -10 x phi 300+ -10 x 380+ -5 mm.
Further, in the first step of step S2, the blank is fed into the furnace at a temperature of less than 750 ℃ and the heating rate is controlled to be 250-400 ℃/h.
Further, in step S3, the ring blank has a size Φ420×Φ300±10×530±5mm.
Further, in step S4, two steps are included: the first process step: feeding the ring blank into a furnace, heating to 1080 ℃, and then preserving heat for 30min; and a second step of: the ring blank is rolled to phi 786+/-3, phi 729+/-3, 518+/-3 mm.
Further, in the first process step of the step S4, the ring blank is fed into the furnace at the temperature of less than 750 ℃ and the heating rate is controlled to be 250-400 ℃/h.
Further, in step S5, the following two steps are included, normalizing: feeding the ring blank into a furnace at room temperature, heating to 720 ℃, then preserving heat for 2 hours, then heating to 930 ℃ again, preserving heat for 3 hours, discharging and air-cooling to room temperature; tempering: and (3) feeding the normalized ring blank into a furnace at room temperature, heating to 740 ℃, preserving heat for 12 hours, discharging, and air-cooling to room temperature.
Further, in step S5, the temperature rising rate in the normalizing and tempering steps is controlled to be between 200 and 400 ℃/h.
Further, in step S10, the ring blank is put into a furnace to be heated to 720 ℃, the temperature is kept for 150-160min, and then the ring blank is air-cooled to room temperature.
In summary, the invention has the following beneficial effects:
1. the deformation performance of the steel D406A is improved in a heat treatment mode, a rolling ring forming mode is adopted to replace a horse frame reaming forming mode, so that accumulation of multiple dimensional errors is avoided, the product precision after rolling rings is improved, and the dimensional precision is ensured to be within +/-3 mm.
2. The product quality stability and reliability are improved by improving and refining grains through multiple heat treatments.
3. The steps are simplified, multiple mandrel drawing and horse reaming are not needed, the whole production period is reduced by 2-3 days, and the production efficiency of the product is improved.
4. The spheroidizing annealing process is added before rough machining of the ring blank, so that the lamellar cementite in the pearlite is enabled to be granular and uniformly distributed on a ferrite matrix (the structure is spherical pearlite), the effects of reducing hardness, refining grains and uniformly organizing are achieved, the deformation of the subsequent machining cutting process is avoided, and the problems that the ring blank cracks in the subsequent spinning process of forming a missile or an engine shell are avoided.
5. Compared with the traditional method, the method has the advantages that the required machining allowance is small, so that the feeding of raw materials is reduced, the energy waste and the raw material waste are avoided, the subsequent machining cutting amount is small due to the reduction of the feeding weight, and the production time is indirectly reduced.
Drawings
FIG. 1 is a schematic step diagram of a method for forming a large-diameter thin-wall high-cylinder ultra-high strength steel D406A ring forging.
FIG. 2 is a schematic diagram of a temperature profile of ring blank spheroidizing annealing.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1: a forming method of a large-diameter thin-wall high-cylinder type ultra-high strength steel D406A ring forging, as shown in figure 1, comprises the following steps:
s1: blanks were obtained by blanking, the blank size was Φ400 (+3/0) mm, 330 (+3/0) mm and the weight was 325kg.
S2: and upsetting and punching the blank. Comprises two steps: the first process step: and (3) feeding the blank into a furnace, feeding the blank into the furnace at the temperature of less than 750 ℃, heating to 1080 ℃ at the speed of 250 ℃/h, and then preserving the heat for 120min. And a second step of: upsetting cakes and punching the blank to the size: phi 465+ -10 x phi 300+ -10 x 380+ -5 mm. Avoid the temperature rising too fast and the widmannstatten structure generated in the blank structure, which causes the decrease of the structure toughness. The reason that the heat treatment temperature is selected to be 1080 ℃ is that with the increase of the temperature, the refining degree of martensite grains is increased, fine grains have more grain boundaries to block the movement of dislocation, the expansion of cracks is lightened, the strength and the plasticity of the material can be improved, and the temperature exceeds 1110 ℃, needle-shaped martensite appears in a tissue, so that the coarse grains affect the performance.
S3: and (5) blank making to obtain a ring blank. The dimensions of the ring blank are phi 420 multiplied by phi 300 plus or minus 10 multiplied by 530 plus or minus 5mm.
S4: and (5) ring rolling of the ring blank. Comprises two steps, namely, a first step: the ring blank is put into a furnace at the temperature of less than 750 ℃, heated to 1080 ℃ at the speed of 250 ℃/h, and then is kept for 30min. And a second step of: the ring blank is rolled to phi 786+/-3, phi 729+/-3, 518+/-3 mm.
S5: and (5) heat treatment of the ring blank. Comprises two steps of normalizing: the ring blank is put into a furnace at room temperature, heated to 720 ℃ at the speed of 200 ℃/h, then kept for 2 hours, then heated to 930 ℃ again, kept for 3 hours, taken out of the furnace and cooled to room temperature, and normalized to further refine the internal crystallization, improve the strength of the ring blank and reduce the cracking tendency of the component. Tempering: and (3) feeding the normalized ring blank into a furnace at room temperature, heating to 740 ℃ at a speed of 200 ℃/h, preserving heat for 12h, discharging and air-cooling to room temperature. The long heat preservation time is mainly used for fully dissolving cementite in a tissue, and carbon atoms are distributed more uniformly in martensite, so that better mechanical properties are obtained.
S6: and (5) physical and chemical detection of the ring blank.
S7: and (5) spheroidizing annealing the ring blank. In the step S7, the ring blank is subjected to spheroidizing annealing, the temperature change curve chart 2 in the whole process shows that the temperature of the ring blank is less than or equal to 400 ℃, the ring blank is fed into a furnace, the temperature is raised to 720 ℃ at 200 ℃/h and kept for 5h, the temperature is raised to 800 ℃ at 200 ℃/h and kept for 4h, the temperature is lowered to 700 ℃ at 30 ℃/h and kept for 20h, the temperature is lowered to 640 ℃ at 30 ℃/h and kept for 6h, and the ring blank is discharged from the furnace and cooled to 550 ℃ and cooled to the room temperature.
S8: and (5) rough machining of the ring blank.
S9: ultrasonic flaw detection of the ring blank.
S10: and (5) stress relief annealing of the ring blank. And (5) feeding the ring blank into a furnace, heating to 720 ℃, preserving heat for 150min, and then air-cooling to room temperature.
S11: and (5) performing ring blank finish machining. And processing the workpiece to the size of the part according to the drawing size.
S12: and (5) detecting products.
S13: and (5) warehousing products.
Example 2: a method for forming a large-diameter thin-wall high-cylinder type ultra-high strength steel D406A ring forging comprises the following steps, different from those in the embodiment 1:
s2: and upsetting and punching the blank. The first process step: feeding the blank into a furnace, feeding the blank into the furnace at the temperature of less than 750 ℃, heating to 1080 ℃ at the speed of 320 ℃/h, and then preserving heat for 120min.
S4: and (5) ring rolling of the ring blank. Comprises two steps, namely, a first step: the ring blank is put into a furnace at the temperature of less than 750 ℃, heated to 1080 ℃ at the speed of 320 ℃/h, and then is kept for 30min.
S5: and (5) heat treatment of the ring blank. Comprises two steps of normalizing: feeding the ring blank into a furnace at room temperature, heating to 720 ℃ at a speed of 300 ℃/h, then preserving heat for 2h, then heating to 930 ℃ again, preserving heat for 3h, discharging and air cooling to room temperature; tempering: and (3) feeding the normalized ring blank into a furnace at room temperature, heating to 740 ℃ at a speed of 300 ℃/h, preserving heat for 12h, discharging and air-cooling to room temperature.
S10: and (5) stress relief annealing of the ring blank. And (5) feeding the ring blank into a furnace, heating to 720 ℃, preserving heat for 155min, and then air-cooling to room temperature.
Example 3: a method for forming a large-diameter thin-wall high-cylinder type ultra-high strength steel D406A ring forging comprises the following steps, different from those in the embodiment 1:
s2: and upsetting and punching the blank. The first process step: and (3) feeding the blank into a furnace, feeding the blank into the furnace at the temperature of less than 750 ℃, heating to 1080 ℃ at the speed of 400 ℃/h, and then preserving the heat for 120min.
S4: and (5) ring rolling of the ring blank. Comprises two steps, namely, a first step: the ring blank is put into a furnace at the temperature of less than 750 ℃, heated to 1080 ℃ at the speed of 400 ℃/h, and then is kept for 30min.
S5: and (5) heat treatment of the ring blank. Comprises two steps of normalizing: feeding the ring blank into a furnace at room temperature, heating to 720 ℃ at a speed of 400 ℃/h, then preserving heat for 2h, then heating to 930 ℃ again, preserving heat for 3h, discharging and air cooling to room temperature; tempering: and (3) feeding the normalized ring blank into a furnace at room temperature, heating to 740 ℃ at a speed of 400 ℃/h, preserving heat for 12h, discharging and air-cooling to room temperature.
S10: and (5) stress relief annealing of the ring blank. And (5) feeding the ring blank into a furnace, heating to 720 ℃, preserving heat for 160min, and then air-cooling to room temperature.
And (3) detecting products:
1. and (3) detecting room temperature tensile properties of the product:
detection standard: GJB3325-98.
Two different batches of finished product were randomly selected from each example for testing, the results of which are shown in the following table:
analysis of detection results: all properties of the product detected at room temperature are greatly improved, and the occurrence of cracking is greatly reduced. And the spheroidizing annealing state hardness is far less than 285HB, and the spheroidizing annealing state hardness is lower, so that the spheroidizing annealing is convenient for subsequent machining.
2. Ultrasonic flaw detection is carried out on the product.
Flaw detection result: the product has no cracks and meets the A-level requirements in GJB 1580A-2004.
3. High power tissue detection after positive tempering:
detection result: the average grain size is 5.5 grade; no metal impurities; brittle inclusions are 1.0 grade, and plastic inclusions are 0.5 grade; the lamellar pearlite is not seen, and the acceptance criterion is met.
4. And (3) detecting a low-power tissue after positive tempering:
detection result: no defect is found, the center is loose by 0.5 level, the segregation is 0 level, and the acceptance criterion is met.
5. High power tissue detection after annealing:
detection result: the average grain size was 5 grade.
The raw material feeding weight of the production raw material is reduced by 20% -30%, the product percent of pass is improved to more than 99%, the whole production period is reduced by 2-3 days, and the actual economic benefit of enterprises is improved.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Claims (4)
1. The forming method of the large-diameter thin-wall high-cylinder type ultra-high strength steel D406A ring forging is characterized by comprising the following steps of: s1: blanking to obtain a blank; s2: upsetting and punching a blank; s3: preparing a blank to obtain a ring blank; s4: ring rolling of the ring blank; s5: heat treatment of the ring blank; s6: performing physical and chemical detection on the ring blank; s7: spheroidizing annealing of the ring blank; s8: rough machining of the ring blank; s9: ultrasonic flaw detection of the ring blank; s10: stress relief annealing of the ring blank; s11: finish machining of the ring blank;
in step S4, two steps are included: the first process step: feeding the ring blank into a furnace, heating to 1080 ℃, and then preserving heat for 30min; and a second step of: rolling the ring blank to phi 786+/-3, phi 729+/-3, 518+/-3 mm; in the first step of the step S4, the ring blank is fed into a furnace at the temperature of less than 750 ℃ and the heating rate is controlled to be 250-400 ℃/h;
in step S5, the following two steps are included, normalizing: feeding the ring blank into a furnace at room temperature, heating to 720 ℃, then preserving heat for 2 hours, then heating to 930 ℃ again, preserving heat for 3 hours, discharging and air-cooling to room temperature; tempering: feeding the normalized ring blank into a furnace at room temperature, heating to 740 ℃, preserving heat for 12 hours, discharging, and air-cooling to room temperature; the temperature rising rate in the normalizing and tempering steps is controlled between 200-400 ℃/h;
in the step S7, the ring blank is subjected to spheroidizing annealing, the ring blank is put into a furnace at the temperature of not more than 400 ℃, is heated to 720 ℃ for heat preservation for 5 hours at the temperature of 200 ℃/h, is heated to 800 ℃ for heat preservation for 4 hours at the temperature of 200 ℃/h, is cooled to 700 ℃ for heat preservation for 20 hours at the temperature of 30 ℃/h, is cooled to 640 ℃ for heat preservation for 6 hours at the temperature of 30 ℃/h, is cooled to 550 ℃ in the furnace, and is discharged from the furnace for air cooling to the room temperature;
in the step S10, the ring blank is put into a furnace to be heated to 720 ℃, the temperature is kept for 150-160min, and then the ring blank is air-cooled to the room temperature.
2. The method for forming the large-diameter thin-wall high-cylinder type ultra-high strength steel D406A ring forging according to claim 1, which is characterized in that: in step S2, two steps are included: the first process step: heating the blank to 1080 ℃ in a furnace, and then preserving heat for 120min; and a second step of: upsetting cakes and punching the blank to the size: phi 465+ -10 x phi 300+ -10 x 380+ -5 mm.
3. The method for forming the large-diameter thin-wall high-cylinder type ultra-high strength steel D406A ring forging according to claim 2, which is characterized in that: in the first step of the step S2, the blank is fed into a furnace at the temperature of less than 750 ℃ and the heating rate is controlled to be 250-400 ℃/h.
4. The method for forming the large-diameter thin-wall high-cylinder type ultra-high strength steel D406A ring forging according to claim 1, which is characterized in that: in step S3, the dimensions of the ring blank are Φ420×Φ300.+ -. 10×530.+ -. 5mm.
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| CN113976787A (en) * | 2021-10-09 | 2022-01-28 | 湖北三江航天江北机械工程有限公司 | Method for preparing wall-thickness-variable ultrathin ultrahigh-strength steel cylinder |
| CN114473370B (en) * | 2021-12-15 | 2023-06-09 | 西安航天动力机械有限公司 | Preparation method of stainless steel thin-wall cylinder |
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