CN107345288B - A kind of manufacturing method of nuclear power generating equipment steel and its forging - Google Patents
A kind of manufacturing method of nuclear power generating equipment steel and its forging Download PDFInfo
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- CN107345288B CN107345288B CN201710514640.8A CN201710514640A CN107345288B CN 107345288 B CN107345288 B CN 107345288B CN 201710514640 A CN201710514640 A CN 201710514640A CN 107345288 B CN107345288 B CN 107345288B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
-
- 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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
-
- 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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Forging (AREA)
Abstract
The invention discloses the manufacturing methods of a kind of nuclear power generating equipment steel and its forging, include the following steps：Using a kind of special steel material as blank, one layer of glassy coating is coated in blank surface, then adds the duplex forging mode of open die forging to forge blank using closed die forging, obtains secondary forging stock；Then normalizing is carried out to secondary forging stock, and 1150 DEG C is raised to using anxious emergency gradient increased temperature mode, then cycle alternation mode carries out quenching heat treatment three times using air-cooled water cooling；The double tempering for being tempered again water cooling again using tempering water cooling to quenched secondary forging base is handled to get to the nuclear power generating equipment steel forgings.The combination of the forging technology and heat treatment process of the present invention effectively prevents complex-shaped heavy forging hardening break, and comprehensive mechanical property, corrosion resistance and the anti-radiation performance of the nuclear power generating equipment steel forgings of manufacture are greatly improved, and can be perfectly suitable for nuclear power work condition environment.
Description
Technical field
The present invention relates to the manufacturing methods of a kind of nuclear power generating equipment steel and its forging, belong to high performance metal material processing
Field.
Background technology
Chinese Economy Development can not possibly change still in industrialization period, the economic development structure of highly energy-consuming within the short time
Become, electricity needs is growing day by day.Greatly develop the higher substitute electric power of economy is the trend of the times of China's energy strategy,
The diversification of the energy is the important guarantee of national energy security strategy.Nuclear power runs history identity for many years, and nuclear energy is gradually evolved into
For a kind of safe and clean, reliable energy.Nuclear Power Development can improve China based on coal, the overseas interdependency of oil gas is excessively high
Energy supply structure is conducive to ensure national energy security and economic security.A large amount of influences of the coal fired power generation to environment are also more next
Bigger, national atmospheric condition allows of no optimist." the year two thousand twenty unit GDP is promised to undertake in the warp-wise whole world for Chinese Government
(GDP) CO2 emission declined 40% to 45% than 2005 ", therefore in order to complete the target of carbon emission reduction, need development new
Clean energy resource.Nuclear power is a kind of clean energy resource of technology maturation.
Though China's nuclear power technology starting evening is supported to quickly grow by country energetically in recent years.It introduces in succession in China
The nuclear power technology of France, Canada, Russia and the U.S., and while introducing technology, organize the digestion of manpower completing technology
It absorbs, currently, it is domestic in the main force's heap-type built, basic production domesticization is designed, and complete technology upgrading on this basis, developed
Nuclear power technology with independent intellectual property right.China's nuclear power technology has simultaneously started outlet, is not only expanded to third world countries, also
The candidate scope of the developed countries such as Europe is entered, Chinese Nuclear Power technology has been able to carry out with international other nuclear powers power competing
It strives.
Nuclear power equipment is usually worked under high temperature, high pressure, deep-etching and the working condition that irradiates by force with metal material, to material
The requirement of material is high, usually to meet nuclearity energy, mechanical property, chemical property, physical property, irradiation behaviour, processing performance, warp
The requirement of the various performances such as Ji property, will reach dedicated Standard andRegulation requirement, and common used material is carbon steel, alloy in industry at present
Steel, stainless steel, nickel-base alloy etc..But use conventional forging means to handle above-mentioned material and will appear the phenomenon for being difficult to forge, one
A little as cast condition metallurgical imperfections, such as segregation, loose, shrinkage cavity will to some extent remain in forging, make forging in heat treatment process
The middle stress concentration that will generate bigger often leads to forging during heat treatment or in placement process after heat treatment
Crack, or because internal stress there are due to reduce useful life of the part when being on active service.In addition, the anti-radiation performance of material
On be also difficult to meet needed for nuclear power equipment steel.Therefore, it is desirable to which the manufacturing method of nuclear power equipment steel and its forging a kind of solves
The certainly above problem.
Invention content
To solve the deficiencies in the prior art, the object of the present invention is to provide one kind, low energy consumption, steel utilization ratio is high, raw
The manufacturing method for producing nuclear power equipment steel at low cost, that working condition is good and its forging, nuclear power can be reached by forging the material come
It equips and required meets nuclearity energy, mechanical property, chemical property, physical property, irradiation behaviour, processing performance, economy etc.
Various performance requirement indexs.
For this purpose, the present invention provides a kind of nuclear power generating equipment steel, which is characterized in that each ingredient of the steel and its quality percentage
It is than content：
The present invention also provides a kind of manufacturing methods of nuclear power generating equipment steel forgings, which is characterized in that includes the following steps：
(1) pre-treatment is forged：Using above-mentioned nuclear power generating equipment steel as blank, one layer of glassy coating is coated in blank surface, it is accurate
It is standby to be forged；
(2) it forges：
1. carrying out first forging using closed die forging to obtain once forging base, forging initial forging temperature is 1250 DEG C, finish-forging temperature
Degree is 950 DEG C, and forging ratio is more than 3.5: 1；
2. then being forged again using open die forging, secondary forging base is obtained, forging initial forging temperature is 1250 DEG C, finish-forging
Temperature is 900 DEG C, and forging ratio is more than 3: 1；
(3) heat treatment after forging：Normalized treatment is carried out to the secondary forging base that step (2) obtains；
(4) property heat treatment：
1. being raised to 1150 DEG C using anxious-slow-anxious gradient increased temperature mode to the secondary forging base that step (3) obtains, then adopt
It is alternately quenched three times with air-cooled-Water-cooling circulating；
2. it is-air-cooled-using tempering to quenched secondary forging base be tempered again-again air-cooled double tempering handle to get
To the nuclear power generating equipment steel forgings.
Further, glassy coating main component and its mass percentage content described in above-mentioned steps (1) are：
Further, in above-mentioned steps (2), the specific forging step of step 1. is：The upsetting in an axial direction in mold by blank
Slightly → diametrically upsetting pull → secondary jumping-up → secondary upsetting pull → jumping-up → upsetting pull three times three times again.
Further, in above-mentioned steps (2), the specific forging step of step 2. is：By blank in free compression in an axial direction
→ by the blank of jumping-up diametrically upsetting pull → tetra- of the jumping-up of free upsetting pull → secondary jumping-up → secondary upsetting pull → three times → three times
Secondary jumping-up → tetra- time upsetting pull.
Further, in above-mentioned steps (3), the normalized treatment specifically includes following steps：Two that step (2) is obtained
After secondary forging base is heated to 1050 ± 20 DEG C and keeps the temperature 4 hours, comes out of the stove and be air-cooled to room temperature.
Further, in above-mentioned steps (4), 1. anxious-slow-anxious gradient increased temperature mode of step the specific steps are：With not low
It is rapidly heated in the temperature of 200 DEG C/h and then keeps the temperature 4h to 500 DEG C；Then it is slowly warming up to the speed for being not higher than 60 DEG C/h
After 950 DEG C, 4.5h is kept the temperature；Then it is rapidly heated again to 1150 DEG C with being not less than 200 DEG C/h, and keeps the temperature 2.5h.
Further, in above-mentioned steps (4), step is 1. air-cooled-and water cooling enters water in cycle alternation martemper technique three times
Cooling time t empirically formula t=K × D estimate that in formula, steel material COEFFICIENT K is 3~5s/mm, and D is the straight of forging
Diameter, unit mm；The air cooling time is into 5.0~10.0 times of the water cooling time, and the water temperature that when beginning quenches is less than 20 DEG C,
At the end of the water temperature that quenches be less than 45 DEG C.
Further, in above-mentioned steps (4), 1. step carries out the process of quenching heat treatment using the alternately quenching technical
In, circular treatment is carried out to water when water cooling, wherein the flow velocity of water is not less than 0.6m/s.
In conclusion the nuclear power equipment steel of the present invention and its manufacturing method of forging, select special steel material, and will
Forging technology and heat treatment process combine, i.e., the duplex forging technique of closed die forging combination open die forging combines air-cooled-water cooling
The quenching-and-tempering process of secondary cycle alternation martemper twice not only effectively prevents complex-shaped heavy forging quenching and opens
Corrosion resistance, comprehensive mechanical property and the anti-radiation performance for the nuclear power equipment steel forgings for splitting, and manufacturing significantly are carried
Height can be perfectly suitable for nuclear power work condition environment.
Description of the drawings
Fig. 1 is the SEM figures that the manufacturing method of the present invention obtains nuclear power generating equipment steel forgings.The continuously distributed depth of grain boundaries in figure
The titanium samarium interphase of color.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
Nuclear power generating equipment steel according to the present invention, includes the following components'mass percentage：
Contain more chromium and nickel in the composition of the above steel, can be effectively prevented in forging process complex-shaped big
The cracking of forging and strengthen its comprehensive mechanical property and corrosion resistance.It also added titanium and a small amount of rare earth samarium in iron and steel component
Element, one side titanium and samarium element are just precipitated in grain boundary sites during solidification, hinder growing up for crystal grain, play thin
Change crystal grain effect, improves the comprehensive mechanical property of alloy；On the other hand, the ratio between titanium and samarium element are specially allocated, in this way, not only
It can play and promote alloy comprehensive mechanical property and corrosion resistance, additionally it is possible to greatly improve the anti-radiation performance of steel.
Such allocation process, is not only directed to this ingredient of samarium and its proportioning makes simple adjustment, but needs
A large amount of creative work is made in forging process combined process parameter in conjunction with other compositions, such as titanium, carbon, molybdenum, could be obtained
Ideal nuclear power equipment steel.
In addition, the invention further relates to the nuclear power generating equipment manufacturing methods of its forging of steel, such as embodiment 1-3：
Embodiment 1：
The nuclear power generating equipment manufacturing method of its forging of steel according to an aspect of the present invention, includes the following steps：
(1) pre-treatment is forged：Using a kind of special steel of nuclear power generating equipment as blank, one layer of glassy painting is coated in blank surface
Layer, the ladle include each component of following mass percent：
The glassy coating main component and its mass percentage content are：
On the one hand glassy coating on forging surface carries out protection to forging surface and effectively prevent scaling loss and oxidation, another
A certain amount of Fe is added in the glassy coating of aspect3Al makes to play certain insulation effect to steel in forging process
Forging extended residence time in the high temperature environment provides time enough and is formed in grain boundaries for the formation of above-mentioned titanium samarium interphase
Continuously distributed form.
(2) it forges：
1. carrying out first forging using closed die forging to obtain once forging base；It is 1200 DEG C to forge initial forging temperature, finish-forging temperature
Degree is 950 DEG C, and forging ratio is more than 3.5: 1；
2. then being forged again using open die forging, secondary forging base is obtained；It is 1250 DEG C to forge initial forging temperature, finish-forging
Temperature is 900 DEG C, and forging ratio is more than 3: 1；
(3) heat treatment after forging：To the secondary forging base that step (2) obtains be heated to 1030 DEG C and keep the temperature 4 hours after, come out of the stove
It is air-cooled to room temperature.
1. being raised to 1150 DEG C using anxious-slow-anxious gradient increased temperature mode to the secondary forging base that step (3) obtains, then adopt
With air-cooled-water cooling, cycle alternation mode quenches three times.Specifically heating mode is：It is rapidly heated to 500 with the speed of 200 DEG C/h
DEG C, then keep the temperature 4h.4.5h is kept the temperature after being then slowly warming up to 950 DEG C with the temperature of 60 DEG C/h.It is then quick with 200 DEG C/h again
1150 DEG C of heating, and keep the temperature 2.5h.Then quenching technical carries out quenching hot place in the way of air-cooled-water cooling three times cycle alternation
Reason, concrete technology are：15 minutes → water cooling of air cooling, 3 minutes → air cooling, 15 minutes → water cooling, 3 minutes → air
15 minutes → water cooling is cooled down to room temperature.
2. quenched secondary forging base is tempered again using tempering-water cooling-- again the double tempering of water cooling handle, specifically
Treatment process is：Tempering temperature is 650 DEG C, after keeping the temperature 3h, carries out water cooling to room temperature, then carry out double tempering, secondary returning
Fiery temperature is 600 DEG C, after keeping the temperature 3h, carries out water cooling to room temperature to get to the nuclear power generating equipment steel forgings.
Forging technology uses the duplex forging technique of closed die forging combination open die forging, closed die forging stage, not only by as cast condition
The genetic defects such as loose in metal, gap and crackle farthest reduce, and improve the consistency and continuity of metal, also for
The formation of metal interphase provides the formation condition of high temperature and pressure.The open die forging stage is by coarseer tissue and in the analysis of grain boundaries
The interphase gone out rub it is broken, mix, so that the inside and outside tissue of forging is tended to uniform, effectively alleviate the degree of segregation of forging, while profit
So that material grains is refined with large plastometric set effect, further increases the comprehensive mechanical property and anti-radiation performance of alloy.Using
The purpose of compound forging is more using blank deformation direction change, and steel ingot center portion metal flows outward, has effectively been crushed in steel ingot
The as cast condition dendrite tissue and interphase of the heart, and the defects of closing loose, hole inside steel ingot, crackle is forged, improve metal
Consistency and continuity；The kneading for promoting as-cast structure simultaneously makes the inside and outside tissue of forging tend to uniform, alleviates forging tissue
Segregation journey, ensure forging in the quenching process of subsequent Tempering and Quenching from tissue, avoid forging tissue defects cause
Quenching stress concentrate crackle or therefrom caused by hardening break, enhance complex-shaped forging and resist heat treatment thermal stress and group
Knit the impact capacity of stress.
The quenching-and-tempering process of air-cooled-water cooling cycle alternation martemper twice, it is ensured that hot stage more
Slow cooling ensures that steel just enter water cooling at 850~900 DEG C and drastically cool down, can effectively make steel to reduce the internal stress of material
Carbide, which is completely dissolved, in material homogenizes with alloying element in austenite.It is alternately cooled back and forth in this way, both maintains material
Mechanical property, while thermal stress and structural stress that forging heat treatment generates can be also reduced to the maximum extent, it reduces in transition
Stress concentration caused by section, it is therefore prevented that the hardening break and implosion of forging, while also obtaining uniformly tiny quenching structure.
Embodiment 2：
(1) pre-treatment is forged：Using a kind of special steel of nuclear power generating equipment as blank, one layer of glassy painting is coated in blank surface
Layer, the ladle include each component of following mass percent：
The glassy coating main component and its mass percentage content are：
(2) it forges：
1. carrying out first forging using closed die forging to obtain once forging base；It is 1200 DEG C to forge initial forging temperature, finish-forging temperature
Degree is 950 DEG C, and forging ratio is more than 3.5: 1；
2. then being forged again using open die forging, secondary forging base is obtained；It is 1250 DEG C to forge initial forging temperature, finish-forging
Temperature is 900 DEG C, and forging ratio is more than 3: 1；
(3) heat treatment after forging：To the secondary forging base that step (2) obtains be heated to 1050 DEG C and keep the temperature 4 hours after, come out of the stove
It is air-cooled to room temperature.
(4) property heat treatment：
1. being raised to 1150 DEG C using anxious-slow-anxious gradient increased temperature mode to the secondary forging base that step (3) obtains, then adopt
With air-cooled-water cooling, cycle alternation mode quenches three times.Specifically heating mode is：It is rapidly heated to 500 with the speed of 250 DEG C/h
DEG C, then keep the temperature 4h.4.5h is kept the temperature after being then slowly warming up to 950 DEG C with the temperature of 40 DEG C/h.It is then quick with 250 DEG C/h again
1150 DEG C of heating, and keep the temperature 2.5h.Then quenching technical carries out quenching hot place in the way of air-cooled-water cooling three times cycle alternation
Reason, concrete technology are：16 minutes → water cooling of air cooling, 2 minutes → air cooling, 16 minutes → water cooling, 2 minutes → air
16 minutes → water cooling is cooled down to room temperature.
2. quenched secondary forging base is tempered again using tempering-water cooling-- again the double tempering of water cooling handle, specifically
Treatment process is：Tempering temperature is 650 DEG C, after keeping the temperature 3h, carries out water cooling to room temperature, then carry out double tempering, secondary returning
Fiery temperature is 600 DEG C, after keeping the temperature 3h, carries out water cooling to room temperature to get to the nuclear power generating equipment steel forgings.
Embodiment 3：
(1) pre-treatment is forged：Using a kind of special steel of nuclear power generating equipment as blank, one layer of glassy painting is coated in blank surface
Layer, the ladle include each component of following mass percent：
The glassy coating main component and its mass percentage content are：
(2) it forges：
1. carrying out first forging using closed die forging to obtain once forging base；It is 1200 DEG C to forge initial forging temperature, finish-forging temperature
Degree is 950 DEG C, and forging ratio is more than 3.5: 1；
2. then being forged again using open die forging, secondary forging base is obtained；It is 1250 DEG C to forge initial forging temperature, finish-forging
Temperature is 900 DEG C, and forging ratio is more than 3: 1；
(3) heat treatment after forging：To the secondary forging base that step (2) obtains be heated to 1070 DEG C and keep the temperature 4 hours after, come out of the stove
It is air-cooled to room temperature.
(4) property heat treatment：
1. being raised to 1150 DEG C using anxious-slow-anxious gradient increased temperature mode to the secondary forging base that step (3) obtains, then adopt
With air-cooled-water cooling, cycle alternation mode quenches three times.Specifically heating mode is：It is rapidly heated to 500 with the speed of 230 DEG C/h
DEG C, then keep the temperature 4h.4.5h is kept the temperature after being then slowly warming up to 950 DEG C with the temperature of 45 DEG C/h.It is then quick with 230 DEG C/h again
1150 DEG C of heating, and keep the temperature 2.5h.Then quenching technical carries out quenching hot place in the way of air-cooled-water cooling three times cycle alternation
Reason, concrete technology are：10 minutes → water cooling of air cooling, 1 minute → air cooling, 10 minutes → water cooling, 1 minute → air
10 minutes → water cooling is cooled down to room temperature.
2. quenched secondary forging base is tempered again using tempering-water cooling-- again the double tempering of water cooling handle, specifically
Treatment process is：Tempering temperature is 650 DEG C, after keeping the temperature 3h, carries out water cooling to room temperature, then carry out double tempering, secondary returning
Fiery temperature is 600 DEG C, after keeping the temperature 3h, carries out water cooling to room temperature to get to the nuclear power generating equipment steel forgings.
Nuclear power generating equipment steel forgings, which are obtained, by above-mentioned manufacturing method integrates mechanics data comparison：
1 nuclear power generating equipment of table integrates mechanics data comparison with steel forgings
As shown in Table 1, above-mentioned 3 embodiment products require to be compared with international technical norms, the production that the present invention obtains
Product mechanics parameter is above international technical norms requirement, and compared with industry common used material, mechanical performance index is significantly higher, especially
It is that impact property is increased dramatically.It is obtained greatly using the comprehensive mechanical property of the nuclear power equipment steel forgings manufactured by this patent
Amplitude improves, and can be perfectly suitable for nuclear power work condition environment.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of manufacturing method of nuclear power generating equipment steel forgings, which is characterized in that each ingredient and matter of the nuclear power generating equipment steel
Measuring degree is：
The manufacturing method includes the following steps：
(1) pre-treatment is forged：Using the nuclear power generating equipment steel as blank, blank surface coat one layer of glassy coating, prepare into
Row forging；
(2) it forges：
1. carrying out first forging using closed die forging to obtain once forging base, forging initial forging temperature is 1250 DEG C, and final forging temperature is
950 DEG C, forging ratio is more than 3.5: 1；
2. then being forged again using open die forging, secondary forging base is obtained, forging initial forging temperature is 1250 DEG C, final forging temperature
It it is 900 DEG C, forging ratio is more than 3: 1；
(3) heat treatment after forging：Normalized treatment is carried out to the secondary forging base that step (2) obtains；
(4) property heat treatment：
1. being raised to 1150 DEG C using anxious-slow-anxious gradient increased temperature mode to the secondary forging base that step (3) obtains, sky is then used
Cold-Water-cooling circulating alternately quenches three times；
2. it is-air-cooled-using tempering to quenched secondary forging base be tempered again-again air-cooled double tempering handle to get to institute
State nuclear power generating equipment steel forgings；Wherein glassy coating main component and its mass percentage content described in step (1) are：
2. manufacturing method as described in claim 1, which is characterized in that in above-mentioned steps (2), the specific forging step of step 1.
For：By blank in mold in an axial direction jumping-up → again diametrically the jumping-up of upsetting pull → secondary jumping-up → secondary upsetting pull → three times →
Upsetting pull three times.
3. manufacturing method as described in claim 1, which is characterized in that in above-mentioned steps (2), the specific forging step of step 2.
For：By blank in free compression in an axial direction → by the diametrically free upsetting pull → secondary jumping-up → secondary upsetting pull of the blank of jumping-up
→ jumping-up → upsetting pull → tetra- time jumping-up → tetra- time upsetting pull three times three times.
4. manufacturing method as described in claim 1, which is characterized in that in above-mentioned steps (3), the normalized treatment specifically includes
Following steps：After the secondary forging base that step (2) obtains is heated to 1050 ± 20 DEG C and keeps the temperature 4 hours, comes out of the stove and be air-cooled to room
Temperature.
5. manufacturing method as described in claim 1, which is characterized in that in above-mentioned steps (4), 1. anxious-slow-anxious gradient liter of step
Warm mode the specific steps are：Then temperature to be not less than 200 DEG C/h is rapidly heated keeps the temperature 4h to 500 DEG C；Then with not high
After the speed of 60 DEG C/h is slowly warming up to 950 DEG C, 4.5h is kept the temperature；Then it is rapidly heated again to 1150 with being not less than 200 DEG C/h
DEG C, and keep the temperature 2.5h.
6. manufacturing method as described in claim 1, which is characterized in that in above-mentioned steps (4), step is 1. air-cooled-water cooling three times
Entering water cooling time t in cycle alternation martemper technique, empirically formula t=K × D is estimated, in formula, steel material system
Number K is 3~5s/mm, and D is the diameter of forging, unit mm；The air cooling time be into 5.0~10.0 times of the water cooling time,
The water temperature quenched when beginning is less than 20 DEG C, at the end of the water temperature that quenches be less than 45 DEG C.
7. manufacturing method as described in claim 1, which is characterized in that in above-mentioned steps (4), 1. step is quenched using the alternating
During ignition technique carries out quenching heat treatment, circular treatment is carried out to water when water cooling, wherein the flow velocity of water is not less than 0.6m/
s。
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| CN108796179A (en) * | 2018-07-02 | 2018-11-13 | 洛阳Lyc轴承有限公司 | A kind of water-cooling method of GCr15SiMn steel oversize forging blank normalizing |
| CN110760763A (en) * | 2019-11-06 | 2020-02-07 | 江阴市恒润环锻有限公司 | Forging method of steel ring forging for nuclear power equipment |
| CN113145777A (en) * | 2020-12-31 | 2021-07-23 | 无锡派克新材料科技股份有限公司 | Manufacturing method for improving strength and low-temperature impact property of austenite ferrite duplex stainless steel |
| CN115874029A (en) * | 2022-12-22 | 2023-03-31 | 河南中原特钢装备制造有限公司 | Grain refinement method for high-alloy Cr-Ni-Mo-V steel hollow part |
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