CN107345288A - A kind of manufacture method of nuclear power generating equipment steel and its forging - Google Patents
A kind of manufacture method of nuclear power generating equipment steel and its forging Download PDFInfo
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- CN107345288A CN107345288A CN201710514640.8A CN201710514640A CN107345288A CN 107345288 A CN107345288 A CN 107345288A CN 201710514640 A CN201710514640 A CN 201710514640A CN 107345288 A CN107345288 A CN 107345288A
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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
-
- 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
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Forging (AREA)
Abstract
The invention discloses the manufacture method of a kind of nuclear power generating equipment steel and its forging, comprise the following steps：Using a kind of special ferrous materials as blank, one layer of glassy coating is coated in blank surface, the duplex forging mode for then adding open die forging using closed die forging is forged to blank, obtains secondary forging stock；Then normalizing is carried out to secondary forging stock, and 1150 DEG C are raised to using anxious emergency gradient increased temperature mode, then cycle alternation mode carries out quenching heat treatment three times using air cooling water cooling；The double tempering for being tempered again water cooling again using tempering water cooling to the secondary forging base after quenching is handled, that is, obtains the nuclear power generating equipment steel forgings.The combination of the forging technology and Technology for Heating Processing of the present invention effectively prevent complex-shaped heavy forging hardening break, and the nuclear power generating equipment of manufacture is greatly improved with the comprehensive mechanical property, corrosion resistance and anti-radiation performance of steel forgings, can be perfectly suitable for nuclear power work condition environment.
Description
Technical field
The present invention relates to the manufacture method 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.The history identity of nuclear power operation for many years, nuclear energy are progressively 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 too high
Energy supply structure, be advantageous 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, it is necessary to develop new
Clean energy resource.Nuclear power is a kind of clean energy resource of technology maturation.
Though in China's nuclear power technology starting evening, support to quickly grow energetically by country in recent years.Introduce in succession in China
France, Canada, Russian and the U.S. nuclear power technology, and while introducing technology, organize the digestion of manpower completing technology
Absorb, it is at present, domestic in the main force's heap-type built, the basic production domesticization of design, and technology upgrading is completed on this basis, develop
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
Enter candidate's category of the developed countries such as Europe, Chinese Nuclear Power technology has been able to carry out with international other nuclear powers power competing
Strive.
Nuclear power equipment is generally worked with metal material under high temperature, high pressure, deep-etching and the working condition that irradiates by force, to material
The requirement of material is high, generally 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 special 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 processing above-mentioned material to occur the phenomenon for being difficult to forge, one
A little as cast condition metallurgical imperfections, such as segregation, loose, shrinkage cavity will remain in forging to some extent, make forging in heat treatment process
It is middle to produce bigger stress concentration, forging is often led in heat treatment process or in the placement process after heat treatment terminates
Useful life when ftractureing, or part is reduced under arms because of the presence of internal stress.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 a kind of nuclear power equipment is solved with the manufacture method of steel and its forging
Certainly above mentioned problem.
The content of the invention
To solve the deficiencies in the prior art, it is an object of the present invention to provide a kind of energy consumption is low, steel utilization ratio is high, raw
The manufacture method of the production nuclear power equipment steel that cost is low, working condition is good and its forging, nuclear power can be reached by forging the material come
Meet nuclearity energy, mechanical property, chemical property, physical property, irradiation behaviour, processing performance, economy etc. required for equipment
Various performance requirement indexs.
Therefore, the invention provides a kind of nuclear power generating equipment steel, it is characterised in that each composition of the steel and its quality percentage
It is than content：
Present invention also offers a kind of manufacture method of nuclear power generating equipment steel forgings, it is characterised in that comprises 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) forge：
1. carrying out first forging using closed die forging is once forged base, forging initial forging temperature is 1250 DEG C, finish-forging temperature
Spend for 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, finish-forging
Temperature is 900 DEG C, and forging ratio is more than 3: 1；
(3) heat treatment after forging：The secondary forging base obtained to step (2) carries out normalized treatment；
(4) property heat treatment：
1. the secondary forging base obtained to step (3) is raised to 1150 DEG C using anxious-slow-anxious gradient increased temperature mode, then adopt
Alternately quenched three times with air cooling-Water-cooling circulating；
2. being handled using the double tempering of air cooling of tempering-air cooling-be tempered again-again the secondary forging base after quenching, produce
To the nuclear power generating equipment steel forgings.
Further, glassy coating main component and its mass percentage content are described in above-mentioned steps (1)：
Further, in above-mentioned steps (2), the specific forging step of step 1. is：The upsetting vertically in mould 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 vertically
→ 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 is incubated 4 hours, come out of the stove and be air-cooled to room temperature.
Further, in above-mentioned steps (4), step is 1. anxious-and slow-anxious gradient increased temperature mode concretely comprises the following steps：With not low
4h is rapidly heated to 500 DEG C and then is incubated in 200 DEG C/h temperature；Then slowly it is warming up to the speed not higher than 60 DEG C/h
After 950 DEG C, 4.5h is incubated；Then again to be rapidly heated not less than 200 DEG C/h to 1150 DEG C, and it is incubated 2.5h.
Further, in above-mentioned steps (4), 1. air cooling-water cooling enters water in cycle alternation martemper technique to step three times
Empirically formula t=K × D is estimated cool time t, and in formula, ferrous materials COEFFICIENT K is 3~5s/mm, and D is the straight of forging
Footpath, unit mm；Air cool time is into 5.0~10.0 times of the water cooling time, and the water temperature quenched during beginning 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 during water cooling, wherein, the flow velocity of water is not less than 0.6m/s.
In summary, the manufacture method of nuclear power equipment steel of the invention and its forging, from special ferrous materials, and will
Forging technology and Technology for Heating Processing combine, i.e. duplex forging technique combination air cooling-water cooling of closed die forging combination open die forging
The quenching-and-tempering process of secondary cycle alternation martemper twice, it not only effectively prevent complex-shaped heavy forging quenching and open
Split, and the nuclear power equipment manufactured is significantly carried with the corrosion resistance of steel forgings, comprehensive mechanical property and anti-radiation performance
Height, nuclear power work condition environment can be perfectly suitable for.
Brief description of the drawings
Fig. 1 is that the manufacture method of the present invention obtains the SEM figures of nuclear power generating equipment steel forgings.The continuously distributed depth of grain boundaries in figure
The titanium samarium interphase of color.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
According to the nuclear power generating equipment steel of the present invention, include the component of following mass percent：
Contain more chromium and nickel in the composition of above steel, can effectively prevent in forging process complex-shaped big
The cracking of forging and strengthen its comprehensive mechanical property and corrosion resistance.Titanium and a small amount of rare earth samarium are also added in iron and steel component
Element, one side titanium and samarium element just separate out during solidification in grain boundary sites, hinder growing up for crystal grain, serve thin
Change crystal grain effect, improve the comprehensive mechanical property of alloy；On the other hand, the ratio between titanium and samarium element are specially allocated, so, not only
Lifting alloy comprehensive mechanical property and corrosion resistance can be played, additionally it is possible to greatly improve the anti-radiation performance of steel.
Such allocation process, simple adjustment not exclusively is made for this composition of samarium and its proportioning, but needed
With reference to other compositions, such as titanium, carbon, molybdenum are made substantial amounts of creative work, could obtained in forging process combined process parameter
Preferable nuclear power is with equipment steel.
In addition, the invention further relates to the nuclear power generating equipment manufacture method of its forging of steel, such as embodiment 1-3：
Embodiment 1：
The nuclear power generating equipment manufacture method of its forging of steel according to an aspect of the present invention, comprises 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 to forging surface protect effectively prevents scaling loss and oxidation, another
The glassy coating of aspect adds a certain amount of Fe3Al, so as to which certain insulation effect can be played to steel in forging process, make
Forging extended residence time in hot environment, time enough is provided formed in grain boundaries for the formation of above-mentioned titanium samarium interphase
Continuously distributed form.
(2) forge：
1. carrying out first forging using closed die forging is once forged base；It is 1200 DEG C to forge initial forging temperature, finish-forging temperature
Spend for 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；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：After 1030 DEG C are heated to the secondary forging base that step (2) obtains and is incubated 4 hours, come out of the stove
It is air-cooled to room temperature.
1. the secondary forging base obtained to step (3) is raised to 1150 DEG C using anxious-slow-anxious gradient increased temperature mode, then adopt
With air cooling-water cooling, cycle alternation mode quenches three times.Specifically heating mode is：It is rapidly heated with 200 DEG C/h speed to 500
DEG C, then it is incubated 4h.4.5h is incubated after being then slowly warming up to 950 DEG C with 60 DEG C/h temperature.It is then quick with 200 DEG C/h again
1150 DEG C of heating, and it is incubated 2.5h.Then using air cooling-water cooling, cycle alternation mode quenching technical carries out quenching hot place three times
Reason, concrete technology are：Air cools down 15 minutes → water cooling, 3 minutes → air cooling 15 minutes → water cooling, 3 minutes → air
15 minutes → water cooling is cooled down to room temperature.
2. the secondary forging base after quenching is handled using the double tempering of water cooling of tempering-water cooling-be tempered again-again, specifically
Handling process is：Tempering temperature is 650 DEG C, after being incubated 3h, carries out water cooling to normal temperature, then carry out double tempering, secondary returning
Fiery temperature is 600 DEG C, after being incubated 3h, carries out water cooling to normal temperature, that is, obtains 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, space and crackle farthest reduce, and improve the consistency and continuity of metal, also for
The formation of metal interphase provides the formation condition of HTHP.The open die forging stage is by thicker tissue and analysis in grain boundaries
The interphase gone out rub it is broken, mix, the inside and outside tissue of forging is tended to uniform, effectively alleviate the degree of segregation of forging, while profit
Material grains are refined with large plastometric set effect, further improve 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 outwards flows, and has effectively 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 of as-cast structure is promoted simultaneously, the inside and outside tissue of forging is tended to uniform, is alleviated forging tissue
Segregation journey, ensure forging in the quenching process of subsequent Tempering and Quenching from tissue, avoid forge tissue defects trigger
Quenching stress concentrate crackle or caused hardening break therefrom, strengthen complex-shaped forging resistance heat treatment thermal stress and group
Knit the impact capacity of stress.
The quenching-and-tempering process of air cooling-water cooling cycle alternation martemper twice, it is ensured that in hot stage more
Slow cooling ensures that steel just drastically cool at 850~900 DEG C into water cooling, can effectively make steel to reduce the internal stress of material
Carbide is completely dissolved in material homogenizes with alloying element in austenite.So it is alternately cooled back and forth, both maintains material
Mechanical property, at the same can also reduce to greatest extent forging heat treatment caused by thermal stress and structural stress, reduce in transition
Stress concentration caused by section, it is therefore prevented that the hardening break and implosion of forging, while also obtain 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) forge：
1. carrying out first forging using closed die forging is once forged base；It is 1200 DEG C to forge initial forging temperature, finish-forging temperature
Spend for 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；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：After 1050 DEG C are heated to the secondary forging base that step (2) obtains and is incubated 4 hours, come out of the stove
It is air-cooled to room temperature.
(4) property heat treatment：
1. the secondary forging base obtained to step (3) is raised to 1150 DEG C using anxious-slow-anxious gradient increased temperature mode, then adopt
With air cooling-water cooling, cycle alternation mode quenches three times.Specifically heating mode is：It is rapidly heated with 250 DEG C/h speed to 500
DEG C, then it is incubated 4h.4.5h is incubated after being then slowly warming up to 950 DEG C with 40 DEG C/h temperature.It is then quick with 250 DEG C/h again
1150 DEG C of heating, and it is incubated 2.5h.Then using air cooling-water cooling, cycle alternation mode quenching technical carries out quenching hot place three times
Reason, concrete technology are：Air cools down 16 minutes → water cooling, 2 minutes → air cooling 16 minutes → water cooling, 2 minutes → air
16 minutes → water cooling is cooled down to room temperature.
2. the secondary forging base after quenching is handled using the double tempering of water cooling of tempering-water cooling-be tempered again-again, specifically
Handling process is：Tempering temperature is 650 DEG C, after being incubated 3h, carries out water cooling to normal temperature, then carry out double tempering, secondary returning
Fiery temperature is 600 DEG C, after being incubated 3h, carries out water cooling to normal temperature, that is, obtains 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) forge：
1. carrying out first forging using closed die forging is once forged base；It is 1200 DEG C to forge initial forging temperature, finish-forging temperature
Spend for 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；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：After 1070 DEG C are heated to the secondary forging base that step (2) obtains and is incubated 4 hours, come out of the stove
It is air-cooled to room temperature.
(4) property heat treatment：
1. the secondary forging base obtained to step (3) is raised to 1150 DEG C using anxious-slow-anxious gradient increased temperature mode, then adopt
With air cooling-water cooling, cycle alternation mode quenches three times.Specifically heating mode is：It is rapidly heated with 230 DEG C/h speed to 500
DEG C, then it is incubated 4h.4.5h is incubated after being then slowly warming up to 950 DEG C with 45 DEG C/h temperature.It is then quick with 230 DEG C/h again
1150 DEG C of heating, and it is incubated 2.5h.Then using air cooling-water cooling, cycle alternation mode quenching technical carries out quenching hot place three times
Reason, concrete technology are：Air cools down 10 minutes → water cooling, 1 minute → air cooling 10 minutes → water cooling, 1 minute → air
10 minutes → water cooling is cooled down to room temperature.
2. the secondary forging base after quenching is handled using the double tempering of water cooling of tempering-water cooling-be tempered again-again, specifically
Handling process is：Tempering temperature is 650 DEG C, after being incubated 3h, carries out water cooling to normal temperature, then carry out double tempering, secondary returning
Fiery temperature is 600 DEG C, after being incubated 3h, carries out water cooling to normal temperature, that is, obtains the nuclear power generating equipment steel forgings.
Nuclear power generating equipment, which is obtained, by above-mentioned manufacture method integrates mechanics data comparison with steel forgings：
The nuclear power generating equipment of table 1 integrates mechanics data comparison with steel forgings
As shown in Table 1, above-mentioned 3 embodiment products are contrasted with international technical norms requirement, 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.Obtained greatly with the comprehensive mechanical property of steel forgings using the nuclear power equipment manufactured by this patent
Amplitude improves, and can be perfectly suitable for nuclear power work condition environment.
Described above is only the 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, some improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of nuclear power generating equipment steel, it is characterised in that each composition of the steel and its mass percentage content are：
2. a kind of manufacture method for manufacturing nuclear power generating equipment its forging of steel as claimed in claim 1, it is characterised in that including following
Step：
(1) pre-treatment is forged：Using above-mentioned nuclear power generating equipment steel as blank, blank surface coat one layer of glassy coating, prepare into
Row forging；
(2) forge：
1. carrying out first forging using closed die forging is once forged 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
For 900 DEG C, forging ratio is more than 3: 1；
(3) heat treatment after forging：The secondary forging base obtained to step (2) carries out normalized treatment；
(4) property heat treatment：
1. the secondary forging base obtained to step (3) is raised to 1150 DEG C using anxious-slow-anxious gradient increased temperature mode, then using sky
Cold-Water-cooling circulating alternately quenches three times；
2. being handled using the double tempering of air cooling of tempering-air cooling-be tempered again-again the secondary forging base after quenching, that is, obtain institute
State nuclear power generating equipment steel forgings.
Glassy coating main component and its mass percentage content are wherein described in step (1)：：
3. manufacture method as claimed in claim 2, it is characterised in that in above-mentioned steps (2), the specific forging step of step 1.
For：By blank in mould vertically jumping-up → again diametrically the jumping-up of upsetting pull → secondary jumping-up → secondary upsetting pull → three times →
Upsetting pull three times.
4. manufacture method as claimed in claim 2, it is characterised in that in above-mentioned steps (2), the specific forging step of step 2.
For：By blank in free compression vertically → 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.
5. manufacture method as claimed in claim 2, it is characterised in that in above-mentioned steps (3), the normalized treatment specifically includes
Following steps：After the secondary forging base that step (2) is obtained is heated to 1050 ± 20 DEG C and is incubated 4 hours, come out of the stove and be air-cooled to room
Temperature.
6. manufacture method as claimed in claim 2, it is characterised in that in above-mentioned steps (4), 1. anxious-slow-anxious gradient liter of step
Warm mode concretely comprises the following steps：4h is rapidly heated to 500 DEG C and then is incubated with the temperature not less than 200 DEG C/h；Then with not high
After 60 DEG C/h speed is slowly warming up to 950 DEG C, 4.5h is incubated；Then again to be rapidly heated not less than 200 DEG C/h to 1150
DEG C, and it is incubated 2.5h.
7. manufacture method as claimed in claim 2, it is characterised in that in above-mentioned steps (4), 1. air cooling-water cooling is three times for step
Entering water cooling time t in cycle alternation martemper technique, empirically formula t=K × D is estimated, in formula, ferrous materials system
Number K be 3~5s/mm, and D is the diameter of forging, unit mm；Air cool time be into 5.0~10.0 times of the water cooling time,
The water temperature quenched during beginning is less than 20 DEG C, at the end of the water temperature that quenches be less than 45 DEG C.
8. manufacture method as claimed in claim 2, it is characterised 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 during water cooling, wherein, the flow velocity of water is not less than 0.6m/
s。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710514640.8A CN107345288B (en) | 2017-06-29 | 2017-06-29 | A kind of manufacturing method of nuclear power generating equipment steel and its forging |
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Cited By (4)
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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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| 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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