CN106929637A - A kind of nuclear power evaporator Technology for Heating Processing of ellipse head forging - Google Patents
A kind of nuclear power evaporator Technology for Heating Processing of ellipse head forging Download PDFInfo
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- CN106929637A CN106929637A CN201710117300.1A CN201710117300A CN106929637A CN 106929637 A CN106929637 A CN 106929637A CN 201710117300 A CN201710117300 A CN 201710117300A CN 106929637 A CN106929637 A CN 106929637A
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- 238000005242 forging Methods 0.000 title claims abstract description 78
- 238000010438 heat treatment Methods 0.000 title claims abstract description 57
- 238000005516 engineering process Methods 0.000 title claims abstract description 23
- 238000012545 processing Methods 0.000 title claims abstract description 21
- 238000009413 insulation Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 3
- 238000012360 testing method Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
-
- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The present invention discloses a kind of Technology for Heating Processing of nuclear power evaporator ellipse head forging, for material of the outside dimension not less than Ф 6000mm for the ellipsoidal head forging of SA508Gr.3Cl.2 steel is heat-treated, comprises the following steps：The first step：Forging is heated to 720~810 DEG C in heating furnace, is incubated；Insulation terminates rear water hardening；Second step：Forging is heated to 880~900 DEG C in heating furnace, is incubated；Insulation terminates rear water hardening；3rd step：Forging is heated to 635~655 DEG C in heating furnace, is incubated；It is incubated forging air cooling after terminating.After being processed through Technology for Heating Processing of the invention, the end socket bowl mouth end and lug boss position of ellipse head forging all obtain 7 grades of grain size, 6 grades of grain sizes are obtained compared to common process improve a grade, and forging entirety obdurability has also been obtained larger raising, there is larger having more than needed compared to Performance Assessment requirement, it is possible to decrease underproof risk occurs in product.
Description
Technical field
The present invention relates to a kind of Technology for Heating Processing of nuclear power generating equipment forging, and in particular to a kind of nuclear power evaporator is sealed with oval
The Technology for Heating Processing of head forging.
Background technology
CAP1400 steam generators are the generation Ⅲ nuclear power steam of the independent development on the basis of AP1000 steam generators
Generator, is the following main stream generator heap-type that will develop.Compared with AP1000 steam generator forging, CAP1400
The tonnage and size of steam generator forging bigger, integrated degree are higher, considerably increase the manufacture difficulty of forging.
CAP1400 nuclear steam generators use SA508Gr.3Cl.2 steel makings with ellipse head forging, such as the institute of accompanying drawing 1
Show.The forging uses the manufacture of head sealing cover and end socket ring integrated molding, compared to AP1000 ellipse head forging tonnage more
Greatly, shape is more complicated, belongs to typical special thick abnormal shape complex forging.Forging heat treatment outside dimension is not less than Φ 6000mm, heat
Treatment tonnage is more than 100 tons.Because ellipse head forging different parts wall thickness variation is larger, especially at boss and the rim of a bowl end wall
Thick difference is big, by taking Fig. 1 as an example, thickest 640mm at boss, the rim of a bowl wall thickness about 200mm, and different parts wall thickness variation maximum can
Complex-shaped up to more than 400mm, and forging, diverse location deflection is inconsistent during forging swaging deformation, bowl mouth end
Deflection is larger, and deflection is relatively small at boss, it is easy to cause the difference of two position grain sizes and tissue, at boss very
To be possible to because deflection deficiency cause coarse-grain or mixed crystal problem.In addition, in heat treatment process, two ends are aobvious due to wall thickness
Write difference and cause heating and thermal insulation Time Inconsistency, the actual soaking time of bowl mouth end is more long, easily causes grain coarsening.The end socket is forged
Part two ends are required for sampling examination mechanical property, so heat treatment is very difficult.
The common process of SA508Gr.3Cl.2 steel nuclear power heavy forging property heat treatments generally using normalizing as preparation heat at
Reason, for the forging of original state coarse grains, the technique is difficult to abundant thinning microstructure grain size.Using normative heat treatment work
Skill, the grain size of CAP1400 evaporator ellipsoidal head forging lug boss positions cannot be refined effectively, and grain size is only 6 grades,
And bowl mouth end can cause crystal grain to be further roughened because long-time high-temperature heating is incubated.
By (such as CN103627873A) in the prior art normative heat treatment technique obtain AP1000 ellipse heads and
The grain size of CAP1400 ellipsoidal heads is all only 6 grades, and its obdurability mechanics parameter is also only that can reach to use reluctantly to want
Ask, so there is product obdurability performance when CAP1400 evaporator ellipsoidal head forging is using normative heat treatment technique productions
Disqualification rate risk higher.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of oval envelope of SA508Gr.3Cl.2 steel nuclear power evaporator
The Technology for Heating Processing of head forging, it can solve the problem that common process can not effectively refine forging crystal grain, and forging grain size is low, and forging
The not enough problem of obdurability.
In order to solve the above technical problems, a kind of SA508Gr.3Cl.2 steel nuclear power evaporator provided by the present invention is oval
The Technology for Heating Processing of end socket forging, including：
The first step：Forging is heated to 720~810 DEG C in heating furnace, is incubated；
Insulation duration is determined that 1~2h is incubated per 100mm, and forging is hung out heating furnace and turned by insulation after terminating by forging wall thickness
Water hardening in tank；
Second step：Forging is heated to 880~900 DEG C in heating furnace, is incubated；
Insulation duration is determined that 1~2h is incubated per 100mm, and forging is hung out heating furnace and turned by insulation after terminating by forging wall thickness
Water hardening in tank；
3rd step：Forging is heated to 635~655 DEG C in heating furnace, is incubated；
Insulation duration is determined that 1~2h is incubated per 100mm, and forging is hung out heating furnace sky by insulation after terminating by forging wall thickness
It is cold.
The solution have the advantages that：The Technology for Heating Processing control first step of the invention is incubated at 720~810 DEG C,
Second step is incubated at 880~900 DEG C, and the first step is incubated at 635~655 DEG C, by above-mentioned three step process, one side
The less position of bowl mouth end wall thickness can be prevented because the insulation of long-time influence of high austenizing temp causes grain coarsening；On the other hand it is brilliant
Grain thinning effect is conducive to eliminating the influence of the coarse-grain that the larger position of wall thickness is caused because deformation is not enough at boss.Through this hair
After bright Technology for Heating Processing treatment, the larger end socket bowl mouth end of the wall thickness variation of ellipse head forging and lug boss position are all obtained
7 grades of grain size, obtains 6 grades of grain sizes and improves a grade, and forging entirety obdurability is also obtained compared to common process
Larger raising, has larger more than needed, it is possible to decrease underproof risk occurs in product compared to Performance Assessment requirement.
Brief description of the drawings
Fig. 1 is the heat of the nuclear steam generator ellipse head forging of existing use SA508Gr.3Cl.2 steel makings
Treatment surplus figure.
Fig. 2 is Technology for Heating Processing figure of the invention.
Specific embodiment
Clear, complete description is carried out to technical scheme below in conjunction with accompanying drawing, it is clear that described implementation
Example is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the common skill in this area
The every other embodiment that art personnel are obtained on the premise of creative work is not made, belongs to the model of present invention protection
Enclose.
The SA508Gr.3Cl.2 steel nuclear power evaporator of the invention Technology for Heating Processing of ellipse head forging, it is mainly
Ellipsoidal head forging of the CAP1400 steam generators outside dimension not less than Ф 6000mm is applied to be heat-treated, including
Following steps：
The first step：Forging is heated to 720~810 DEG C in heating furnace, is incubated；Insulation duration is determined by forging wall thickness
It is fixed, it is incubated 1~2h per 100mm, forging is hung out heating furnace and turns water hardening in tank by insulation after terminating；
Second step：Forging is heated to 880~900 DEG C in heating furnace, is incubated；Insulation duration is determined by forging wall thickness
It is fixed, it is incubated 1~2h per 100mm, forging is hung out heating furnace and turns water hardening in tank by insulation after terminating；
3rd step：Forging is heated to 635~655 DEG C in heating furnace, is incubated；Insulation duration is determined by forging wall thickness
It is fixed, 1~2h is incubated per 100mm, forging is hung out heating furnace air cooling by insulation after terminating.
Cooling Process is carried out by heavy forging routine water-cooling method.Insulation duration typically can be by the rim of a bowl area sampling point
Wall thickness calculate.
Ellipse head forging performance heat treatment after, bowl mouth end respectively in T/4, T/2, T3/4, position sample, at boss away from
Surface 20mm × 40mm position samples.Sample carry out performance and fabric analysis before through 600 DEG C × 48h Simulated post-weld heat treatments.
The final mechanical property of forging and tissue grain size test result are shown in Table 1.
As a comparison, the test portion removed before the ellipse head forging performance is heat-treated is simulated existing normal in the lab
Rule Technology for Heating Processing carries out property heat treatment, and 600 DEG C × 48h Simulated post-weld heat treatments, its mechanical property are carried out after property heat treatment
2 can be the results are shown in Table with fabric analysis.
The CAP1400 ellipsoidal heads performance of table 1 and grain size test result (average value)
The existing common process contrast and experiment (average value) of table 2
The performance test results of table 1 show that integrally tough sexual satisfaction examination will for CAP1400 evaporator ellipsoidal heads forging
(numerical value in table bracket is examination scope) is asked, and with larger surplus capacity, is significantly improved compared to common process, obtained
Obtained good obdurability；It is no to be influenceed by wall thickness variation also, the rim of a bowl and boss performance difference are smaller；Metallographic Analysis
Result shows, end socket bowl mouth end and lug boss position all obtain 7 grades of grain size, and test result is used in the lab with sample
Performance after PROCESS FOR TREATMENT of the invention is consistent.With the Data Comparison of table 2, Technology for Heating Processing of the invention can obtain 7 grades of grain sizes,
Compared to the grain size that common process can only obtain 6 grades, a grade is improve；And Technology for Heating Processing of the invention obtains AKv values
Apparently higher than existing process, 12~38% are improved, have larger having more than needed compared to Performance Assessment requirement, it is possible to decrease product occurs not
Qualified risk.
AP1000 steam generators forging and CAP1400 evaporator ellipsoidal head forging have identical material and with
The close heat treatment wall thickness dimension of bowl mouth end, table 3 is listed certain AP1000 steam generators forging and is heat-treated using traditional performance
The obdurability test result (Simulated post-weld heat treatment state) that technique is obtained, its grain size is also only 6 grades；And through heat of the invention
After handling process treatment, also improved to 7 grades through analyzing its grain size.
The AP1000 steam generators forging performance of table 3 and grain size test result (average value)
With the AP1000 steam generators and CAP1400 evaporator ellipsoidal head forging phases using normative heat treatment technique
Than using the ellipsoidal head forging of Technology for Heating Processing of the invention, its intensity and toughness have different degrees of raising, crystal grain
Degree improves a grade, is further refined, and has fully demonstrated new technology of the present invention and forging obdurability is changed
Kind effect and the thinning effect to organizing grain size.
In sum, the various embodiments described above and accompanying drawing are only presently preferred embodiments of the present invention, are not used to limit this
The protection domain of invention, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, done etc., all should
Comprising within the scope of the present invention.
Claims (4)
1. a kind of nuclear power evaporator Technology for Heating Processing of ellipse head forging, the material of Ф 6000mm is not less than for outside dimension
Matter is heat-treated for the ellipsoidal head forging of SA508Gr.3Cl.2 steel, it is characterised in that comprised the following steps：
The first step：Forging is heated to 720~810 DEG C in heating furnace, is incubated；During forging is turned tank by insulation after terminating
Water hardening；
Second step：Forging is heated to 880~900 DEG C in heating furnace, is incubated；During forging is turned tank by insulation after terminating
Water hardening；
3rd step：Forging is heated to 635~655 DEG C in heating furnace, is incubated；It is incubated forging air cooling after terminating.
2. Technology for Heating Processing according to claim 1, it is characterised in that the guarantor in the first step, second step, the 3rd step
Warm duration is determined that every 100mm is incubated 1~2h by forging wall thickness.
3. Technology for Heating Processing according to claim 1, it is characterised in that the forging different parts wall thickness variation maximum reaches
More than 400mm.
4. Technology for Heating Processing according to claim 1, it is characterised in that the Technology for Heating Processing is used to process CAP1400
And AP1000 nuclear power evaporator forging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710117300.1A CN106929637A (en) | 2017-03-01 | 2017-03-01 | A kind of nuclear power evaporator Technology for Heating Processing of ellipse head forging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710117300.1A CN106929637A (en) | 2017-03-01 | 2017-03-01 | A kind of nuclear power evaporator Technology for Heating Processing of ellipse head forging |
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| Publication Number | Publication Date |
|---|---|
| CN106929637A true CN106929637A (en) | 2017-07-07 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710117300.1A Pending CN106929637A (en) | 2017-03-01 | 2017-03-01 | A kind of nuclear power evaporator Technology for Heating Processing of ellipse head forging |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476088A (en) * | 2008-12-31 | 2009-07-08 | 钢铁研究总院 | R17Cr1Ni3Mo steel for nuclear pressure vessel and preparation thereof |
| CN101906520A (en) * | 2009-06-02 | 2010-12-08 | 上海重型机器厂有限公司 | Heat-treatment technology method for lower end socket forge piece of nuclear power reactor pressure vessel |
| CN102392195A (en) * | 2011-12-15 | 2012-03-28 | 钢铁研究总院 | High-strength high-toughness nuclear power pressure vessel forging steel and its manufacturing method |
| CN103820610A (en) * | 2012-11-19 | 2014-05-28 | 上海重型机器厂有限公司 | Property thermal treatment method for improving toughness of large forging used in nuclear power container |
| CN103820705A (en) * | 2012-11-19 | 2014-05-28 | 上海重型机器厂有限公司 | Performance heat treatment method for SA508-3 large forging for nuclear power vessel |
| CN106222387A (en) * | 2016-07-25 | 2016-12-14 | 苏州热工研究院有限公司 | A kind of heat treatment method of nuclear island super-section forging |
-
2017
- 2017-03-01 CN CN201710117300.1A patent/CN106929637A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476088A (en) * | 2008-12-31 | 2009-07-08 | 钢铁研究总院 | R17Cr1Ni3Mo steel for nuclear pressure vessel and preparation thereof |
| CN101906520A (en) * | 2009-06-02 | 2010-12-08 | 上海重型机器厂有限公司 | Heat-treatment technology method for lower end socket forge piece of nuclear power reactor pressure vessel |
| CN102392195A (en) * | 2011-12-15 | 2012-03-28 | 钢铁研究总院 | High-strength high-toughness nuclear power pressure vessel forging steel and its manufacturing method |
| CN103820610A (en) * | 2012-11-19 | 2014-05-28 | 上海重型机器厂有限公司 | Property thermal treatment method for improving toughness of large forging used in nuclear power container |
| CN103820705A (en) * | 2012-11-19 | 2014-05-28 | 上海重型机器厂有限公司 | Performance heat treatment method for SA508-3 large forging for nuclear power vessel |
| CN106222387A (en) * | 2016-07-25 | 2016-12-14 | 苏州热工研究院有限公司 | A kind of heat treatment method of nuclear island super-section forging |
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Application publication date: 20170707 |