CN107377838A - A kind of nuclear power eliminates the forging method of mixed crystal with SA508Gr.4N steel heavy forging thickness section - Google Patents
A kind of nuclear power eliminates the forging method of mixed crystal with SA508Gr.4N steel heavy forging thickness section Download PDFInfo
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- CN107377838A CN107377838A CN201710662031.7A CN201710662031A CN107377838A CN 107377838 A CN107377838 A CN 107377838A CN 201710662031 A CN201710662031 A CN 201710662031A CN 107377838 A CN107377838 A CN 107377838A
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- forging
- nuclear power
- sa508gr
- mixed crystal
- thickness section
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The invention belongs to the forging molding process of nuclear power heavy forging, the forging method more particularly to a kind of nuclear power with SA508Gr.4N steel heavy forging thickness section elimination mixed crystal.The forging method includes：Shove charge first time heating-up temperature is 1200 DEG C ± 10 DEG C before forging, forging of being come out of the stove after insulation；The forging of same fire time includes jumping-up or/and the pulling of 1~3 time, and forging Soft reduction rate is more than or equal to 0.001s‑1, jumping-up and pulling deflection 35%~65%；Last fire time heating-up temperature is 1090 DEG C ± 10 DEG C, forging of being come out of the stove after insulation；Forge last fire time forging Soft reduction rate 0.005s‑1~0.05s‑1, deflection is 45%~65%.The present invention can eliminate the mixed crystal in heavy forging thickness section.
Description
Technical field
The invention belongs to the forging molding process of nuclear power heavy forging, and in particular to a kind of big forging of SA508Gr.4N steel of nuclear power
Part thickness section eliminates the forging method of mixed crystal.
Background technology
China's electric structure is uneven, and thermoelectricity accounts for very big proportion.With the fast development of social economy, to the demand of electric power
Increasingly aggravate to make power supply and demand relation more nervous.In addition, with further attention of the people to environmental problem, it is this to nuclear power clear
Clean, low-carbon, the demand of high efficient energy sources are more urgent.
SA508Gr.4N steel is the 4N levels of nuclear power generating sets critical material in ASME boiler and pressure vessel specifications, and it is used to make
Make reactor pressure vessel, steam generator and voltage-stablizer etc.；And SA508Gr.4N steel is classified as Generation IV by this area
The candidate material of Supercritical-Pressure Light Water Cooled Reactor pressure vessel in type.The heavy forging manufacture difficulty such as reactor pressure vessel is very big, usually
The problem of being faced with forging thickness section structure and uneven performance.Using existing forging technology it is difficult to ensure that forging thickness section crystal grain
The uniformity of size, often forming mixed crystal causes forging to be scrapped.And the forging method and phase of SA508Gr.4N steel in the prior art
The smithing technological parameter of pass, has not been reported so far.
The content of the invention
For above-mentioned technical problem, it is an object of the invention to provide a kind of nuclear power SA508Gr.4N steel heavy forging thickness section
The forging method of mixed crystal is eliminated, forging thickness section mixed crystal can be eliminated so as to improve the uniform of nuclear power heavy forging thickness section performance
Property, it disclosure satisfy that the localization of nuclear power heavy forging of new generation.
To achieve these goals, the invention provides following technical scheme：
The present invention provides the forging method that a kind of nuclear power eliminates mixed crystal with SA508Gr.4N steel heavy forging thickness section, the forging
Method includes：
Shove charge first time heating-up temperature is 1200 DEG C ± 10 DEG C before forging, forging of being come out of the stove after insulation；
The forging of same fire time includes jumping-up or/and the pulling of 1~3 time, and forging Soft reduction rate is more than or equal to 0.001s-1, jumping-up and pulling deflection 35%~65%；
Last fire time heating-up temperature is 1090 DEG C ± 10 DEG C, forging of being come out of the stove after insulation；
Forge last fire time forging Soft reduction rate 0.005s-1~0.05s-1, deflection is 45%~65%.
In forging process, when surface temperature is less than 800 DEG C, stops forging and return stove heat to 1200 DEG C ± 10 DEG C, be incubated
Come out of the stove after certain time forging.
The final forging temperature of forging is not less than 800 DEG C.
The length of side of forging or a diameter of 2000~3200mm, thickness are 400~600mm.
Compared with prior art, the beneficial effects of the present invention are：
The present invention for SA508Gr.4N steel at home with provide its heavy forging thickness section elimination mixed crystal forging work
Skill, solves that large forgings thickness section crystallite dimension is uneven, and the technical problem of mixed crystal easily occurs, can make heavy forging thickness section
Grain size number is controlled at 3.5~4 grades, and approach is opened for the production domesticization application of the material.
Brief description of the drawings
Fig. 1 is SA508Gr.4N steel using the grain morphology after forging technology of the present invention forging.
Embodiment
The present invention is further described with reference to embodiment.
A kind of nuclear power eliminates the forging technology of mixed crystal with SA508Gr.4N steel heavy forging thickness section, including：
Shove charge first time heating-up temperature is 1200 DEG C ± 10 DEG C before forging, forging of being come out of the stove after held for some time；
Preferably, in forging process, when surface temperature is less than 800 DEG C, stops forging and return stove heat to 1200 DEG C ± 10
DEG C, forging of being come out of the stove after held for some time；
The forging of same fire time includes jumping-up/and the pulling of 1~3 time, and forging Soft reduction rate is more than or equal to 0.001s-1,
Jumping-up and the deflection of pulling are 35%~65%.
Last fire time heating-up temperature is 1090 DEG C ± 10 DEG C, forging of being come out of the stove after held for some time；
Forging last fire makes forging temperature be reduced to 1090 DEG C ± 10 DEG C (with respect to first time heating-up temperatures), forges
Soft reduction rate 0.005s-1~0.05s-1, for the final forging temperature of forging not less than 800 DEG C, deflection is 45%~65%.Forging exists
Rule of thumb formula determines soaking time in stove, and general forging thickness is incubated 1 hour in every 100mm~200mm.Forging
During mixed crystal elimination mainly by the deflection of last fire time, occur in forging thickness cross-wise direction when increasing deflection dynamic
State recrystallizes, and will make in forging cross-wise direction crystal grain refinement so as to eliminate mixed crystal.
Embodiment 1
The present invention is so that nuclear power SA508Gr.4N steel diameters 3500mm, thickness is 600mm pie heavy forgings as an example to this
Invention is described in further details.
The first step, steel ingot shove charge are incubated 5 hours at 1190 DEG C, forging of then coming out of the stove.
Second step, by steel ingot bar hold, gate waste is cut, is pulled out on ton water hydraulic press, forge Soft reduction rate
0.003s-1, deflection 35%.Jumping-up after pulling, forging Soft reduction rate 0.002s-1, deflection 40%.Stove heat is then returned, temperature
Degree is not less than 800 DEG C.1190 DEG C of heating-up temperature is incubated 5 hours.
3rd step, pulling, forging Soft reduction rate 0.005s-1, deflection 45%.Then jaw jumping-up, forging pressure are cut
Speed 0.003s-1, deflection 45%.Then return stove heat and leave enough deflections for last one heat forging, temperature is not less than
800℃.Heating and thermal insulation temperature is 1090 DEG C, is incubated 4 hours.
4th step, jumping-up, forging Soft reduction rate 0.01s-1, deflection 50%.
The forging obtained by above-mentioned forging technology, the defects of can eliminating inside forging, grain size reach 3.5 grades and
More than 3.5 grades, as shown in Figure 1.
Embodiment 2
The present invention is so that nuclear power SA508Gr.4N steel diameters 2000mm, thickness is 400mm pie heavy forgings as an example to this
Invention is described in further details.
The first step, steel ingot shove charge are incubated 3 hours at 1210 DEG C, forging of then coming out of the stove.
Second step, by steel ingot bar hold, gate waste is cut, is pulled out on ton water hydraulic press, forge Soft reduction rate
0.008s-1, deflection 40%.Jumping-up after pulling, forging Soft reduction rate 0.004s-1, deflection 50%.Temperature is not less than 800
℃.Stove heat is then returned, 1210 DEG C of heating-up temperature is incubated 3 hours.
3rd step, pulling, forging Soft reduction rate 0.008s-1, deflection 55%.Then jaw jumping-up, forging pressure are cut
Speed 0.004s-1, deflection 55%.Then return stove heat.Then return stove heat and leave enough deformations for last one heat forging
Amount, temperature are not less than 800 DEG C.Heating and thermal insulation temperature is 1080 DEG C and is incubated 2 hours.
4th step, jumping-up, forging Soft reduction rate 0.01s-1, deflection 55%.
The forging obtained by above-mentioned forging technology, the defects of can eliminating inside forging, grain size reach 3.5 grades and
More than 3.5 grades.
Claims (4)
1. a kind of nuclear power eliminates the forging method of mixed crystal with SA508Gr.4N steel heavy forging thickness section, it is characterised in that：The forging
Method includes：
Shove charge first time heating-up temperature is 1200 DEG C ± 10 DEG C before forging, forging of being come out of the stove after insulation；
The forging of same fire time includes jumping-up or/and the pulling of 1~3 time, and forging Soft reduction rate is more than or equal to 0.001s-1, upsetting
Thick and pulling deflection is 35%~65%；
Last fire time heating-up temperature is 1090 DEG C ± 10 DEG C, forging of being come out of the stove after insulation；
Forge last fire time forging Soft reduction rate 0.005s-1~0.05s-1, deflection is 45%~65%.
2. nuclear power according to claim 1 eliminates the forging method of mixed crystal with SA508Gr.4N steel heavy forging thickness section, its
It is characterised by：In forging process, when surface temperature is less than 800 DEG C, stops forging and return stove heat to 1200 DEG C ± 10 DEG C, be incubated
Come out of the stove after certain time forging.
3. nuclear power according to claim 1 eliminates the forging method of mixed crystal with SA508Gr.4N steel heavy forging thickness section, its
It is characterised by：The final forging temperature of forging is not less than 800 DEG C.
4. nuclear power according to claim 1 eliminates the forging method of mixed crystal with SA508Gr.4N steel heavy forging thickness section, its
It is characterised by：The length of side of forging or a diameter of 2000~3200mm, thickness are 400~600mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710662031.7A CN107377838B (en) | 2017-08-04 | 2017-08-04 | Forging method for eliminating mixed crystals in thick section of nuclear power SA508Gr.4N steel large forging |
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|---|---|---|---|
| CN201710662031.7A CN107377838B (en) | 2017-08-04 | 2017-08-04 | Forging method for eliminating mixed crystals in thick section of nuclear power SA508Gr.4N steel large forging |
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| CN107377838A true CN107377838A (en) | 2017-11-24 |
| CN107377838B CN107377838B (en) | 2020-03-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111151919A (en) * | 2019-12-27 | 2020-05-15 | 中国第一重型机械集团大连加氢反应器制造有限公司 | Submerged-arc welding wire matched with steel for 3Ni-1.6Cr-0.5Mo nuclear power equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101398165A (en) * | 2008-10-30 | 2009-04-01 | 贵州航天新力铸锻有限责任公司 | Major vapour inlet/outlet joint pipe for nuclear plant steam generator and forging method thereof |
| CN101987342A (en) * | 2009-08-07 | 2011-03-23 | 上海重型机器厂有限公司 | Forging method of tube sheet of nuclear power equipment |
| CN102353566A (en) * | 2011-06-10 | 2012-02-15 | 中国科学院金属研究所 | Method for displaying thermal deformation texture of steel used for nuclear power pressure container |
| CN105331912A (en) * | 2015-11-27 | 2016-02-17 | 西部超导材料科技股份有限公司 | GH4169 high-temperature alloy bar and manufacturing method thereof |
| CN106756685A (en) * | 2017-01-04 | 2017-05-31 | 中南大学 | A kind of method for refining nickel-based high-temperature alloy forge piece grain structure |
| CN106862447A (en) * | 2017-03-07 | 2017-06-20 | 钢铁研究总院 | A kind of multiway forging method of high-alloying high temperature alloy bar stock/biscuit |
-
2017
- 2017-08-04 CN CN201710662031.7A patent/CN107377838B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101398165A (en) * | 2008-10-30 | 2009-04-01 | 贵州航天新力铸锻有限责任公司 | Major vapour inlet/outlet joint pipe for nuclear plant steam generator and forging method thereof |
| CN101987342A (en) * | 2009-08-07 | 2011-03-23 | 上海重型机器厂有限公司 | Forging method of tube sheet of nuclear power equipment |
| CN102353566A (en) * | 2011-06-10 | 2012-02-15 | 中国科学院金属研究所 | Method for displaying thermal deformation texture of steel used for nuclear power pressure container |
| CN105331912A (en) * | 2015-11-27 | 2016-02-17 | 西部超导材料科技股份有限公司 | GH4169 high-temperature alloy bar and manufacturing method thereof |
| CN106756685A (en) * | 2017-01-04 | 2017-05-31 | 中南大学 | A kind of method for refining nickel-based high-temperature alloy forge piece grain structure |
| CN106862447A (en) * | 2017-03-07 | 2017-06-20 | 钢铁研究总院 | A kind of multiway forging method of high-alloying high temperature alloy bar stock/biscuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111151919A (en) * | 2019-12-27 | 2020-05-15 | 中国第一重型机械集团大连加氢反应器制造有限公司 | Submerged-arc welding wire matched with steel for 3Ni-1.6Cr-0.5Mo nuclear power equipment |
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| CN107377838B (en) | 2020-03-20 |
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