CN114231717A - Method for forging martensitic stainless steel forging - Google Patents
Method for forging martensitic stainless steel forging Download PDFInfo
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- CN114231717A CN114231717A CN202111659462.0A CN202111659462A CN114231717A CN 114231717 A CN114231717 A CN 114231717A CN 202111659462 A CN202111659462 A CN 202111659462A CN 114231717 A CN114231717 A CN 114231717A
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- 238000005242 forging Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 33
- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 39
- 238000000137 annealing Methods 0.000 claims abstract description 28
- 238000005496 tempering Methods 0.000 claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000003754 machining Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 6
- 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
- 238000001816 cooling Methods 0.000 claims description 43
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 6
- 230000035882 stress Effects 0.000 description 30
- 238000007599 discharging Methods 0.000 description 14
- 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
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
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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
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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
-
- 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
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- Forging (AREA)
Abstract
The invention discloses a method for forging a martensitic stainless steel forging, which comprises the following steps: step S1: heating the forging; step S2: carrying out upsetting, punching and forging operations; step S3: returning the hot material to the furnace; step S4: ring rolling; step S5: carrying out annealing after forging; step S6: carrying out first hardness detection; step S7: normalizing operation; step S8: first tempering operation, step S9: processing before heat treatment; step S10: carrying out first stress annealing; step S11: performing secondary tempering operation; step S12: performing second hardness detection; step S13: roughly machining a forged piece; step S14: secondary stress tempering; the residual stress of the forged piece produced by the method for forging the martensitic stainless steel forged piece is obviously reduced, and the problem of cracking of the martensitic stainless steel forged piece can be solved.
Description
Technical Field
The invention relates to the technical field of high-temperature alloy treatment, in particular to a method for forging a martensitic stainless steel forging.
Background
Because the existing martensitic stainless steel can generate large internal stress (structural stress, thermal stress, mechanical stress and the like) in the forging and heat treatment processes, 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 deformation of the forged piece during forging, the generation of structural stress in the forged piece, the thermal stress generated during the cooling and heat treatment (represented by quenching) of the forged piece and the mechanical stress generated during the mechanical processing of the forged piece are the main causes of the cracking of the martensitic stainless steel forged piece, wherein the influence of the thermal stress is the largest;
at present, most martensitic stainless steel forgings are treated by eliminating structural stress generated in the forging process of the forgings through a furnace slow cooling or annealing method after the forging is finished, and simultaneously preventing the thermal stress of the forgings caused by uneven heat dissipation due to the wall thickness of the forgings in the cooling process;
for some martensitic stainless steels, the existing post-forging annealing can eliminate the structural stress and the thermal stress in the forging and cooling processes, but for quenched and rapidly cooled martensitic stainless steel forgings (such as 1Cr12Ni2MoWVNbN), the influence of the structural stress of quenching and rapid cooling is large, and a large amount of internal stress is generated in the quenching process, so that the forgings are 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 a product, and enhancing the deformation energy of a metal material during hot processing so as to ensure that the internal recrystallization of the product is more sufficient, refine the grain size and avoid unqualified performance and flaw detection.
The technical purpose of the invention is realized by the following technical scheme:
a method for forging a martensitic stainless steel forging comprises the following steps:
step S1: heating the forging; step S2: carrying out upsetting, punching and forging operations; step S3: returning the hot material to the furnace; step S4: ring rolling; step S5: carrying out annealing after forging; step S6: carrying out first hardness detection; step S7: normalizing operation; step S8: first tempering operation, step S9: processing before heat treatment; step S10: carrying out first stress annealing; step S11: performing secondary tempering operation; step S12: performing second hardness detection; step S13: roughly machining a forged piece; step S14: secondary stress tempering;
in step S1, the stainless steel bar is put into the furnace at a temperature of less than or equal to 750 ℃, heated to 800-850 ℃ and kept warm for 2.5-3 h, and then kept warm for 4h after being heated to 1150 ℃.
In step S3, the forge piece is annealed and kept at 1150 ℃ for 2h, and then discharged.
In step S5, the forge piece is put into a furnace at a temperature of more than or equal to 500 ℃, heated to 880-950 ℃, kept warm for 6-8 h, cooled to 650-730 ℃ at a speed of 10 ℃/h, kept warm for 6-8 h, cooled to 550-600 ℃ at a speed of 10 ℃/h, kept warm for 6-8 h, cooled to a temperature of less than or equal to 450 ℃ in the furnace, and finally taken out of the furnace and air-cooled to room temperature.
In step S6, the annealed forging is subjected to first hardness detection, and when the hardness is greater than 300HB, the annealing operation is carried out again in step S5.
In step S7, during normalizing operation, the annealed forge piece is put into a furnace at the temperature of less than or equal to 750 ℃, heated to 800 ℃, kept for 180min, heated to 1130 ℃, kept for 300min, taken out of the furnace and air-cooled to room temperature.
In step S8, when the first tempering operation is performed, the forge piece 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 temperature is kept for 10h, and the forge piece is cooled to the room temperature in an air cooling mode.
In the steps S10 and S13, when stress relief annealing is carried out, the forge piece is placed into a furnace at the temperature of less than or equal to 450 ℃, the temperature is raised to 630-680 ℃, heat preservation is carried out for 6-8 hours, then the temperature is lowered to 500-550 ℃, heat preservation is carried out for 8-12 hours, then the forge piece is cooled to the temperature of less than or equal to 450 ℃ in the furnace, and finally the forge piece is taken out of the furnace and air-cooled to the room temperature.
In step S11, when the second tempering operation is performed, the forge piece is put into a furnace at the temperature of less than or equal to 500 ℃, the temperature is increased to 630-680 ℃, the temperature is kept for 8-12 hours, the forge piece is taken out of the furnace and is dispersed for air cooling to the room temperature.
In step S12, performing a second hardness test on the tempered forge piece, and if the hardness is greater than or equal to 300HB, performing step S11 again and performing the second tempering operation again.
In conclusion, the invention has the following beneficial effects:
1. after annealing after forging, carrying out first hardness detection, and annealing again when the hardness is more than 300HB to prevent the stress flow generated by forging from going downwards due to insufficient annealing to cause the cracking of the forged piece;
2. performing primary stress relief annealing after the preliminary heat treatment and the machining before the heat treatment, and checking whether cracks exist, so that the stress generated in the preliminary heat treatment and the machining process is prevented from influencing the subsequent performance heat treatment;
3. the preliminary heat treatment needs to be carried out for the second tempering in a furnace within 4 hours after the forging is cooled, so that the forging is prevented from cracking due to the release of thermal stress generated during the preliminary heat treatment;
4. after the second tempering, the hardness of the forged piece is checked in time, when the hardness is more than or equal to 300HB, the stress generated by quenching cannot be completely eliminated by tempering, and the tempering is required to be arranged immediately;
5. after rough machining of the forge piece is finished, secondary stress annealing is carried out in time to eliminate residual stress of the forge piece and prevent cracking during standing
Drawings
FIG. 1 is a schematic representation of the steps of a method of forging a martensitic stainless steel forging.
FIG. 2 is a temperature/time table for post-forging annealing of a martensitic stainless steel forging method.
FIG. 3 is a temperature/time table for a first stress anneal and a second stress anneal of a martensitic stainless steel forging process.
FIG. 4 is a temperature/time table for a second tempering of a martensitic stainless steel forging process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the present invention is provided 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 is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
Example 1
As shown in fig. 1 to 4, the method for forging a martensitic stainless steel forging of the present embodiment includes the following steps:
step S1: heating the forging piece, putting the stainless steel bar 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 following sizes:
step S3: returning the hot material, returning the forge piece, keeping the temperature of 1150 ℃ for 2h, and discharging;
step S4: ring rolling to a predetermined size:
step S5: annealing after forging, putting the forged piece into a furnace at the temperature of more than or equal to 500 ℃, heating to 880 ℃, preserving heat for 6h, cooling to 650 ℃ at the speed of 10 ℃/h, preserving heat for 6h, cooling to 550 ℃ at the speed of 10 ℃/h again, preserving heat for 6h, cooling to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharging from the furnace and air cooling to room temperature;
step S6: performing the first hardness detection, and performing the step S5 again when the hardness is more than 300HB, and performing the annealing operation again;
step S7: normalizing, namely feeding the annealed forge piece into a furnace at the temperature of less than or equal to 750 ℃, heating to 800 ℃, preserving heat for 180min, then heating to 1130 ℃, preserving heat for 300min, then discharging from the furnace and air cooling to room temperature;
step S8: performing tempering operation for the first time, charging the forge piece at the temperature of less than or equal to 500 ℃, heating to the target temperature of 760 ℃, preserving heat for 10h, and air-cooling to room temperature;
step S9: processing before heat treatment, roughly turning to phi 1402 multiplied by phi 1112 multiplied by 263;
step S10: performing first stress annealing, namely, feeding a forge piece into a furnace at the temperature of less than or equal to 450 ℃, heating to 630 ℃, preserving heat for 6 hours, then cooling to 500 ℃, preserving heat for 8 hours, then cooling to the temperature of less than or equal to 450 ℃ in the furnace, and finally, discharging from the furnace and air cooling to room temperature;
step S11: performing secondary tempering operation, namely feeding the forged piece into a furnace at the temperature of less than or equal to 500 ℃, heating to 630 ℃, preserving heat for 8 hours, discharging out of the furnace, dispersing, and air cooling to room temperature;
step S12: performing hardness detection for the second time, wherein when the hardness is more than or equal to 300HB, the step S11 needs to be performed again, and tempering operation for the second time is performed again;
step S13: roughly machining and forming the forge piece;
step S14: and (3) performing secondary stress annealing, namely, feeding the forged piece into a furnace at the temperature of less than or equal to 450 ℃, heating to 630 ℃, keeping the temperature for 6 hours, cooling to 500 ℃, keeping the temperature for 8 hours, cooling to the temperature of less than or equal to 450 ℃ in the furnace, and finally, discharging from the furnace and air cooling to room temperature.
Example 2:
the procedure differs from example 1 in that:
step S1: and (3) heating the forging piece, feeding the stainless steel bar into a furnace at the temperature of less than or equal to 750 ℃, heating to 825 ℃, preserving heat for 2.75 hours, continuously heating to 1150 ℃, and preserving heat for 4 hours.
Step S5: annealing after forging, putting the forged piece into a furnace at the temperature of more than or equal to 500 ℃, heating to 915 ℃, preserving heat for 7h, cooling to 690 ℃ at the speed of 10 ℃/h, preserving heat for 7h, cooling to 575 ℃ at the speed of 10 ℃/h again, preserving heat for 7h, cooling to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharging from the furnace and air cooling to the room temperature;
step S10: performing primary stress annealing, namely, feeding a forged piece into a furnace at the temperature of less than or equal to 450 ℃, heating to 655 ℃, preserving heat for 7 hours, cooling to 525 ℃, preserving heat for 10 hours, cooling to the temperature of less than or equal to 450 ℃ in the furnace, and finally, discharging from the furnace and air cooling to room temperature;
step S11: performing secondary tempering operation, namely feeding the forged piece into a furnace at the temperature of less than or equal to 500 ℃, heating to 655 ℃, preserving the temperature for 10 hours, discharging the forged piece out of the furnace, dispersing and air-cooling to room temperature;
step S14: and (3) performing secondary stress annealing, namely, feeding the forged piece into a furnace at the temperature of less than or equal to 450 ℃, heating to 655 ℃ for 7 hours, cooling to 525 ℃, 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 piece, feeding the stainless steel bar into a furnace at the temperature of less than or equal to 750 ℃, heating to 850 ℃ and preserving heat for 3h, and preserving heat for 4h after continuously heating to 1150 ℃.
Step S5: annealing after forging, putting the forged 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 again, preserving heat for 8 hours, cooling to the temperature of less than or equal to 450 ℃ in the furnace, and finally discharging from the furnace and air cooling to room temperature;
step S10: performing primary stress annealing, namely, feeding a forged 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 from the furnace and air cooling to room temperature;
step S11: performing secondary tempering operation, namely feeding the forged piece into a furnace at the temperature of less than or equal to 500 ℃, heating to 680 ℃, preserving heat for 12 hours, discharging out of the furnace, dispersing, and air cooling to room temperature;
step S14: and (3) performing secondary stress annealing, namely, feeding the forged 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 from the furnace and air cooling to room temperature.
The surface residual stress of the forged piece forged by the martensitic stainless steel forging method of the first embodiment to the third embodiment was measured:
according to the measurement, the surface residual stress of the forged piece forged by the martensitic stainless steel forging method in the first embodiment to the third embodiment is obviously smaller than that of the forged piece produced by the traditional forging method, and the problem of cracking of the forged piece is solved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The method for forging the martensitic stainless steel forging is characterized by comprising the following steps of:
step S1: heating the forging; step S2: carrying out upsetting, punching and forging operations; step S3: returning the hot material to the furnace; step S4: ring rolling; step S5: carrying out annealing after forging; step S6: carrying out first hardness detection; step S7: normalizing operation; step S8: first tempering operation, step S9: processing before heat treatment; step S10: carrying out first stress annealing; step S11: performing secondary tempering operation; step S12: performing second hardness detection; step S13: roughly machining a forged piece; step S14: and (5) performing secondary stress tempering.
2. The method for forging the martensitic stainless steel forging according to claim 1, wherein: in step S1, the stainless steel bar is put into the furnace at a temperature of less than or equal to 750 ℃, heated to 800-850 ℃ and kept warm for 2.5-3 h, and then kept warm for 4h after being heated to 1150 ℃.
3. The method for forging the martensitic stainless steel forging according to claim 1, wherein: in step S3, the forge piece is annealed and kept at 1150 ℃ for 2h, and then discharged.
4. The method for forging the martensitic stainless steel forging according to claim 1, wherein: in step S5, the forge piece is put into a furnace at a temperature of more than or equal to 500 ℃, heated to 880-950 ℃, kept warm for 6-8 h, cooled to 650-730 ℃ at a speed of 10 ℃/h, kept warm for 6-8 h, cooled to 550-600 ℃ at a speed of 10 ℃/h, kept warm for 6-8 h, cooled to a temperature of less than or equal to 450 ℃ in the furnace, and finally taken out of the furnace and air-cooled to room temperature.
5. The method for forging the martensitic stainless steel forging according to claim 1, wherein: in step S6, the annealed forging is subjected to first hardness detection, and when the hardness is greater than 300HB, the annealing operation is carried out again in step S5.
6. The method for forging the martensitic stainless steel forging according to claim 1, wherein: in step S7, during normalizing operation, the annealed forge piece is put into a furnace at the temperature of less than or equal to 750 ℃, heated to 800 ℃, kept for 180min, heated to 1130 ℃, kept for 300min, taken out of the furnace and air-cooled to room temperature.
7. The method for forging the martensitic stainless steel forging according to claim 1, wherein: in step S8, when the first tempering operation is performed, the forge piece 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 temperature is kept for 10h, and the forge piece is cooled to the room temperature in an air cooling mode.
8. The method for forging the martensitic stainless steel forging according to claim 1, wherein: in the steps S10 and S13, when stress relief annealing is carried out, the forge piece is placed into a furnace at the temperature of less than or equal to 450 ℃, the temperature is raised to 630-680 ℃, heat preservation is carried out for 6-8 hours, then the temperature is lowered to 500-550 ℃, heat preservation is carried out for 8-12 hours, then the forge piece is cooled to the temperature of less than or equal to 450 ℃ in the furnace, and finally the forge piece is taken out of the furnace and air-cooled to the room temperature.
9. The method for forging the martensitic stainless steel forging according to claim 1, wherein: in step S11, when the second tempering operation is performed, the forge piece is put into a furnace at the temperature of less than or equal to 500 ℃, the temperature is increased to 630-680 ℃, the temperature is kept for 8-12 hours, the forge piece is taken out of the furnace and is dispersed for air cooling to the room temperature.
10. The method for forging the martensitic stainless steel forging according to claim 1, wherein: in step S12, performing a second hardness test on the tempered forge piece, and if the hardness is greater than or equal to 300HB, performing step S11 again and performing the second tempering operation again.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01287254A (en) * | 1988-01-12 | 1989-11-17 | Nippon Steel Corp | High carbon stainless steel having high strength and ductility and manufacture thereof |
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