CN114231717B - Forging method of martensitic stainless steel forging - Google Patents
Forging method of martensitic stainless steel forging Download PDFInfo
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- CN114231717B CN114231717B CN202111659462.0A CN202111659462A CN114231717B CN 114231717 B CN114231717 B CN 114231717B CN 202111659462 A CN202111659462 A CN 202111659462A CN 114231717 B CN114231717 B CN 114231717B
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- 238000005242 forging Methods 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 30
- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 238000000137 annealing Methods 0.000 claims abstract description 28
- 238000005496 tempering Methods 0.000 claims abstract description 23
- 238000003754 machining Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000004080 punching Methods 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 43
- 238000001514 detection method Methods 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 6
- 238000012360 testing method Methods 0.000 abstract description 3
- 230000035882 stress Effects 0.000 description 30
- 238000007599 discharging Methods 0.000 description 8
- 230000008646 thermal stress Effects 0.000 description 6
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
-
- 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
- B21J5/002—Hybrid process, e.g. forging following casting
-
- 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
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
-
- 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 forging method of a martensitic stainless steel forging, which comprises the following steps: step S1: heating the forging; step S2: upsetting, punching and forging operations are carried out; step S3: returning hot materials to the furnace; step S4: ring rolling; step S5: annealing after forging; step S6: performing a first hardness test; step S7: normalizing operation; step S8: a first tempering operation, step S9: processing before heat treatment; step S10: first stress annealing; step S11: a second tempering operation; step S12: detecting the hardness for the second time; step S13: rough machining of the forging; step S14: second stress tempering; the forging residual stress produced by the forging method of the martensitic stainless steel forging is obviously reduced, and the problem of cracking of the martensitic stainless steel forging can be solved.
Description
Technical Field
The invention relates to the technical field of high-temperature alloy treatment, in particular to a forging method of a martensitic stainless steel forging.
Background
Because the martensitic stainless steel can generate great internal stress (structural stress, thermal stress, mechanical stress and the like) in the forging and heat treatment processes at present, when the stress exceeds the yield strength of the steel, the part can be deformed, and when the stress is larger and exceeds the tensile strength of the steel, the part can be cracked;
the forging deformation during forging, the structural stress generated in the forging, the thermal stress generated during the cooling and heat treatment (represented by quenching) of the forging and the mechanically-stressed stress generated during the mechanically-stressed machining of the forging are the most main reasons for the cracking of the martensitic stainless steel forging, wherein the influence of the thermal stress is the greatest;
at present, after forging is finished, the tissue stress of the forging in the forging process is eliminated by a method of slow furnace cooling or annealing, and meanwhile, the thermal stress caused by uneven heat dissipation due to the wall thickness of the forging in the cooling process of the forging is prevented;
for partial martensitic stainless steel, the existing annealing after forging can eliminate the structural stress and the thermal stress in the forging and cooling processes, but for a martensitic stainless steel forging (for example, 1Cr12Ni2 MoWVNbN) which is quenched and rapidly cooled, the structural stress effect of quenching and rapid cooling is also relatively large, and a large amount of internal stress is generated in the quenching process, so that the forging is cracked.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a forging method of a martensitic stainless steel forging, which has the advantages of improving the initial forging temperature, optimizing the forging process, improving the plasticity of the product, enhancing the deformation energy of a metal material during hot working, ensuring that the inside of the product is recrystallized more fully, refining the grain size, and avoiding the performance and flaw detection failure.
The technical aim of the invention is realized by the following technical scheme:
a forging method of a martensitic stainless steel forging comprises the following steps:
step S1: heating the forging; step S2: upsetting, punching and forging operations are carried out; step S3: returning hot materials to the furnace; step S4: ring rolling; step S5: annealing after forging; step S6: performing a first hardness test; step S7: normalizing operation; step S8: a first tempering operation, step S9: processing before heat treatment; step S10: first stress annealing; step S11: a second tempering operation; step S12: detecting the hardness for the second time; step S13: rough machining of the forging; step S14: second stress tempering;
in the step S1, stainless steel bars are put into a furnace at the temperature of less than or equal to 750 ℃, heated to 800-850 ℃ and kept for 2.5-3 hours, and kept for 4 hours after being continuously heated to 1150 ℃.
In the step S3, the forging is returned to the furnace and is discharged after heat preservation for 2 hours at 1150 ℃.
In the step S5, the forging is put into a furnace at the temperature of more than or equal to 500 ℃, heated to 880-950 ℃ and kept for 6-8 hours, cooled to 650-730 ℃ at the speed of 10 ℃/h and kept for 6-8 hours, cooled to 550-600 ℃ at the speed of 10 ℃/h and kept for 6-8 hours, cooled to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharged from the furnace for air cooling to the room temperature.
In the step S6, the annealed forging is subjected to first hardness detection, and when the hardness is more than 300HB, the step S5 is required to be carried out again, and the annealing operation is required to be carried out again.
In the step S7, during normalizing operation, the annealed forging is fed into a furnace at the temperature of less than or equal to 750 ℃, heated to 800 ℃, kept at the temperature for 180min, heated to 1130 ℃, kept at the temperature for 300min, and then discharged from the furnace for air cooling to the room temperature.
In the step S8, during the first tempering operation, the forging is put into a furnace at the temperature of less than or equal to 500 ℃, the temperature is raised to the target temperature of 760 ℃, the heat is preserved for 10 hours, and the forging is air-cooled to the room temperature.
In the steps S10 and S14, during the stress relief annealing operation, the forge piece is put into a furnace at the temperature of less than or equal to 450 ℃, heated to 630-680 ℃, kept for 6-8 hours, cooled to 500-550 ℃ and kept for 8-12 hours, cooled to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharged from the furnace for air cooling to the room temperature.
In the step S11, during the second tempering operation, the forging is fed into a furnace at the temperature of less than or equal to 500 ℃, heated to 630-680 ℃, kept for 8-12 hours, discharged from the furnace and scattered for air cooling to the room temperature.
In the step S12, the tempered forging is subjected to a second hardness test, and when the hardness is more than or equal to 300HB, the step S11 is required to be carried out again, and the second tempering operation is carried out again.
In summary, the invention has the following beneficial effects:
1. after annealing after forging, carrying out first hardness detection, and carrying out annealing again when the hardness is more than 300HB to prevent the forging from cracking due to insufficient annealing to enable stress flow generated by forging to be reduced;
2. the first stress relief annealing is carried out after the preliminary heat treatment and before the heat treatment, and whether cracks exist is checked, so that the influence of stress generated during the preliminary heat treatment and the machining on the subsequent performance heat treatment is avoided;
3. the preliminary heat treatment is carried out by feeding the forging into a furnace for the second tempering within 4 hours after the cooling of the forging is finished, so that the cracking caused by the release of thermal stress generated during the preliminary heat treatment of the forging is prevented;
4. checking the hardness of the forging in time after the second tempering, wherein the hardness is more than or equal to 300HB, which indicates that the tempering cannot completely eliminate the stress generated by the quenching, and immediately arranging to re-temper;
5. after the rough machining of the forging is finished, performing secondary stress annealing in time to eliminate residual stress of the forging and prevent cracking during standing
Drawings
FIG. 1 is a schematic illustration of the steps of a forging process for martensitic stainless steel forgings.
FIG. 2 is a temperature/time schedule for a martensitic stainless steel forging method post-forging anneal.
FIG. 3 is a temperature/time schedule for a martensitic stainless steel forging method for a first stress anneal and a second stress anneal.
FIG. 4 is a temperature/time schedule for a second tempering of a martensitic stainless steel forging method.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following more detailed description of the device according to the present invention is given with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for the purpose of facilitating and clearly aiding in the description of embodiments of the invention. For a better understanding of the invention with objects, features and advantages, refer to the drawings. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that any modifications, changes in the proportions, or adjustments of the sizes of structures, proportions, or otherwise, used in the practice of the invention, are included in the spirit and scope of the invention which is otherwise, without departing from the spirit or essential characteristics thereof.
Example 1
As shown in fig. 1 to 4, the forging method of the martensitic stainless steel forging of the present embodiment includes the steps of:
step S1: heating the forging, putting the stainless steel rod into a furnace at the temperature of less than or equal to 750 ℃, heating to 800 ℃, preserving heat for 2.5 hours, continuously heating to 1150 ℃, and preserving heat for 4 hours;
step S2: upsetting and punching to the size:
step S3: returning the hot material to the furnace, returning the forging to the furnace, preserving heat for 2 hours at 1150 ℃, and discharging;
step S4: ring rolling to a predetermined size:
step S5: annealing after forging, feeding the forge piece into a furnace at the temperature of more than or equal to 500 ℃, heating to 880 ℃, preserving heat for 6 hours, cooling to 650 ℃ at the speed of 10 ℃/h, preserving heat for 6 hours, cooling to 550 ℃ at the speed of 10 ℃/h, preserving heat for 6 hours, cooling to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharging and air-cooling to room temperature;
step S6: performing the first hardness detection, and when the hardness is more than 300HB, performing the step S5 again, and performing the annealing operation again;
step S7: normalizing, namely feeding the annealed forging into a furnace at the temperature of less than or equal to 750 ℃, heating to 800 ℃, preserving heat for 180min, heating to 1130 ℃, preserving heat for 300min, discharging and air-cooling to room temperature;
step S8: the first tempering operation, the forging is put into a furnace at the temperature of less than or equal to 500 ℃, the temperature is raised to the target temperature of 760 ℃, the heat is preserved for 10 hours, and the air cooling is carried out to the room temperature;
step S9: machining before heat treatment, and rough turning to phi 1402 multiplied by phi 1112 multiplied by 263;
step S10: the first stress annealing, the forging is put into a furnace at the temperature of less than or equal to 450 ℃, heated to 630 ℃, kept warm for 6 hours, cooled to 500 ℃ and kept warm for 8 hours, then cooled to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharged from the furnace for air cooling to room temperature;
step S11: the second tempering operation, the forging is put into a furnace at the temperature of less than or equal to 500 ℃, heated to 630 ℃ and kept for 8 hours, taken out of the furnace and scattered for air cooling to the room temperature;
step S12: detecting the hardness for the second time, and when the hardness is more than or equal to 300HB, carrying out step S11 again, and carrying out tempering operation again for the second time;
step S13: rough machining and forming of the forging;
step S14: and (3) carrying out secondary stress annealing, feeding the forge piece into a furnace at the temperature of less than or equal to 450 ℃, heating to 630 ℃, cooling to 500 ℃ for 6 hours, preserving heat for 8 hours, cooling to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharging and air cooling to room temperature.
Example 2:
the steps different from example 1 are:
step S1: heating the forging, feeding the stainless steel rod into a furnace at the temperature of less than or equal to 750 ℃, heating to 825 ℃, preserving heat for 2.75h, continuously heating to 1150 ℃, and preserving heat for 4h.
Step S5: annealing after forging, feeding the forge piece into a furnace at the temperature of more than or equal to 500 ℃, heating to 915 ℃, preserving heat for 7 hours, cooling to 690 ℃ at the speed of 10 ℃/h, preserving heat for 7 hours, cooling to 575 ℃ at the speed of 10 ℃/h, preserving heat for 7 hours, cooling to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharging and air-cooling to room temperature;
step S10: the first stress annealing, the forging is put into a furnace at the temperature of less than or equal to 450 ℃, heated to 655 ℃, kept warm for 7 hours, cooled to 525 ℃ and kept warm for 10 hours, cooled to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharged from the furnace for air cooling to room temperature;
step S11: the second tempering operation, the forging is put into a furnace at the temperature of less than or equal to 500 ℃, heated to 655 ℃ and kept for 10 hours, taken out of the furnace and scattered for air cooling to the room temperature;
step S14: and (3) carrying out secondary stress annealing, feeding the forge piece into a furnace at the temperature of less than or equal to 450 ℃, heating to 655 ℃ for 7 hours, cooling to 525 ℃ and preserving heat for 10 hours, cooling to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharging and air cooling to room temperature.
Example 3:
step S1: heating the forging, feeding the stainless steel rod into a furnace at the temperature of less than or equal to 750 ℃, heating to 850 ℃, preserving heat for 3 hours, continuously heating to 1150 ℃, and preserving heat for 4 hours.
Step S5: annealing after forging, feeding the forge piece into a furnace at the temperature of more than or equal to 500 ℃, heating to 950 ℃, preserving heat for 8 hours, cooling to 730 ℃ at the speed of 10 ℃/h, preserving heat for 8 hours, cooling to 600 ℃ at the speed of 10 ℃/h, preserving heat for 8 hours, cooling to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharging and air-cooling to room temperature;
step S10: the first stress annealing, the forging is put into a furnace at the temperature of less than or equal to 450 ℃, heated to 680 ℃, kept warm for 8 hours, cooled to 550 ℃ and kept warm for 12 hours, cooled to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharged from the furnace for air cooling to room temperature;
step S11: the second tempering operation, the forging is put into a furnace at the temperature of less than or equal to 500 ℃, heated to 680 ℃ and kept for 12 hours, taken out of the furnace and scattered for air cooling to the room temperature;
step S14: and (3) carrying out secondary stress annealing, feeding the forge piece into a furnace at the temperature of less than or equal to 450 ℃, heating to 680 ℃, preserving heat for 8 hours, cooling to 550 ℃, preserving heat for 12 hours, cooling to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharging and air-cooling to room temperature.
The surface residual stress of the forging forged by the martensitic stainless steel forging method of the embodiment one to the embodiment three is measured:
according to the measurement, the surface residual stress of the forging forged by the martensitic stainless steel forging method of the first embodiment to the third embodiment is obviously smaller than that of the forging produced by the traditional forging method, and the problem of forging cracking is solved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. The forging method of the martensitic stainless steel forging is characterized by comprising the following steps of:
step S1: heating the forging; step S2: upsetting, punching and forging operations are carried out; step S3: returning hot materials to the furnace; step S4: ring rolling; step S5: annealing after forging; step S6: performing the first hardness detection, and when the hardness is more than 300HB, performing the step S5 again, and performing the annealing operation again; step S7: normalizing operation; step S8: a first tempering operation, step S9: processing before heat treatment; step S10: first stress annealing; step S11: a second tempering operation; step S12: detecting the hardness for the second time, and when the hardness is more than or equal to 300HB, carrying out step S11 again, and carrying out tempering operation again for the second time; step S13: rough machining of the forging; step S14: and (5) performing secondary stress annealing.
2. The forging method of a martensitic stainless steel forging according to claim 1, wherein: in the step S1, stainless steel bars are put into a furnace at the temperature of less than or equal to 750 ℃, heated to 800-850 ℃ and kept for 2.5-3 hours, and kept for 4 hours after being continuously heated to 1150 ℃.
3. The forging method of a martensitic stainless steel forging according to claim 1, wherein: in the step S3, the forging is returned to the furnace and is discharged after heat preservation for 2 hours at 1150 ℃.
4. The forging method of a martensitic stainless steel forging according to claim 1, wherein: in the step S5, the forging is put into a furnace at a temperature of more than or equal to 500 ℃, heated to 880-950 ℃, kept for 6-8 hours, cooled to 650-730 ℃ at a speed of 10 ℃/h, kept for 6-8 hours, cooled to 550-600 ℃ at a speed of 10 ℃/h, kept for 6-8 hours, cooled to less than or equal to 450 ℃ in the furnace, and finally discharged from the furnace for air cooling to room temperature.
5. The forging method of a martensitic stainless steel forging according to claim 1, wherein: in the step S7, during normalizing operation, the annealed forging is fed into a furnace at the temperature of less than or equal to 750 ℃, heated to 800 ℃, kept at the temperature for 180min, heated to 1130 ℃, kept at the temperature for 300min, and then discharged from the furnace for air cooling to the room temperature.
6. The forging method of a martensitic stainless steel forging according to claim 1, wherein: in the step S8, during the first tempering operation, the forging is put into a furnace at the temperature of less than or equal to 500 ℃, the temperature is raised to the target temperature of 760 ℃, the heat is preserved for 10 hours, and the forging is air-cooled to the room temperature.
7. The forging method of a martensitic stainless steel forging according to claim 1, wherein: in the steps S10 and S14, during the stress relief annealing operation, the forging is put into a furnace at the temperature of less than or equal to 450 ℃, heated to 630-680 ℃, kept for 6-8 hours, cooled to 500-550 ℃ and kept for 8-12 hours, cooled to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharged from the furnace for air cooling to the room temperature.
8. The forging method of a martensitic stainless steel forging according to claim 1, wherein: in the step S11, during the second tempering operation, the forging is fed into a furnace at the temperature of less than or equal to 500 ℃, heated to 630-680 ℃, kept for 8-12 hours, discharged from the furnace and scattered for air cooling to the room temperature.
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| CN113106206A (en) * | 2021-04-02 | 2021-07-13 | 成都先进金属材料产业技术研究院股份有限公司 | Manufacturing method of 1Cr11Ni2W2MoV heat-resistant steel forging for fastener |
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| US20070169856A1 (en) * | 2006-01-25 | 2007-07-26 | Chia-Kan Chien | Method for making a hybrid casting and forging stainless steel product |
| EP2204463B8 (en) * | 2007-10-29 | 2019-08-14 | Nippon Steel Corporation | Martensite type steel not requiring heat treatment and hot forged non heat-treated steel parts |
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| CN113106206A (en) * | 2021-04-02 | 2021-07-13 | 成都先进金属材料产业技术研究院股份有限公司 | Manufacturing method of 1Cr11Ni2W2MoV heat-resistant steel forging for fastener |
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