CN105112625A - Manufacturing method of impeller forging of shield pump of pressurized water reactor nuclear power station - Google Patents
Manufacturing method of impeller forging of shield pump of pressurized water reactor nuclear power station Download PDFInfo
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- CN105112625A CN105112625A CN201510630417.0A CN201510630417A CN105112625A CN 105112625 A CN105112625 A CN 105112625A CN 201510630417 A CN201510630417 A CN 201510630417A CN 105112625 A CN105112625 A CN 105112625A
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- 238000005242 forging Methods 0.000 title claims abstract description 79
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000010791 quenching Methods 0.000 claims abstract description 8
- 230000000171 quenching effect Effects 0.000 claims abstract description 6
- 238000007669 thermal treatment Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 29
- 238000010792 warming Methods 0.000 claims description 15
- 238000005496 tempering Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 7
- 238000002271 resection Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 238000005266 casting Methods 0.000 abstract 2
- 239000000463 material Substances 0.000 description 9
- 229910001566 austenite Inorganic materials 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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Abstract
The invention discloses a manufacturing method of an impeller forging of a shield pump of a pressurized water reactor nuclear power station. The manufacturing method is characterized by including the following steps: forging a steel ingot with sufficient removal amount to form a forging; performing quenching performance thermal treatment on the forging, increasing temperature of the forging to 1052 DEG C, maintaining the temperature for 6.5h, air-cooling to 23 DEG C, increasing temperature to 597-600 DEG C, maintaining the temperature for 16h, and air-cooling to 20 DEG C. The manufacturing method has the advantages that the forging is used to replace a casting; compared with the casting, internal defects of the forging are eliminated, and continuous and uniform tissue is generated; excellent comprehensive performance of the forging is guaranteed through proper forging and thermal treatment processes; long service life and fault-free service of the forging can be ensured even if the forging is put at places with large stress and serious crystal internal corrosion.
Description
Technical field
The invention belongs to forging and machining technique field, be specifically related to a kind of manufacture method of pressurized-water reactor nuclear power plant canned-motor pump impeller forging.
Background technology
AP1000 reactor coolant main pump is the design of AP1000 heap-type specially, its major function is for reactor coolant provides drive ram, ensure that enough forced circulation flows are by reactor core, deliver to vapour generator the heat that reactor produces, produce the steam of pushing turbine acting.
Impeller forging is one of key part in main pump, manufacturing technology very difficult, and the main technological difficulties existed are as follows:
(1) except requiring to have except the cooperation of good intensity and plasticity and toughness, also require that solidity to corrosion, weldability and processing characteristics are good;
(2) forging blank is of a size of Φ 860*620, and sectional dimension and thickness are comparatively large, and require that the performance of forging Internal and external cycle meets the demands simultaneously, so need to ensure that forging is fully forged, meets the requirement of nondestructive testing and performance uniformity; Secondly, forging aspect ratio is little, and the metal flow of forging inside is to situation more complicated, and tangential performance examined by forging, needs the problem being solved the tangential performance of forging by forging method;
(3) according to the requirement of input file, need to carry out twice long tempering after forging quenching, and sample to carry out long Simulated post-weld heat treatment in addition, need ensure that the performance of quenched and tempered state and Analog heat-treating state meets the demands simultaneously; According to experience in the past, this material anti-tempered performance is bad, and after long-time tempering, the strength of materials will sharply decline, so will it be made to meet the demands by certain heat treating method.
Summary of the invention
The object of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of manufacture method of pressurized-water reactor nuclear power plant canned-motor pump impeller forging is provided, the forging that this manufacture method combines by carrying out many fire time small deformation amounts and aximal deformation value to steel ingot, and forging is carried out to the property heat treatment of Quench and temper, obtain the forging of excellent combination property.
The object of the invention realizes being completed by following technical scheme:
A manufacture method for pressurized-water reactor nuclear power plant canned-motor pump impeller forging, is characterized in that described manufacture method comprises the steps: to forge the steel ingot with enough resection and forms forging; Quenching property heat treatment is carried out to described forging, described forging is warming up to 1052 DEG C, air cooling to 19 DEG C after insulation 6.5h; Carry out tempering property thermal treatment to described forging afterwards, described forging is warming up to 680 DEG C, air cooling to 23 DEG C after insulation 16h, is again warming up to 597 DEG C ~ 600 DEG C and is incubated 16h, last air cooling to 20 DEG C.
Carry out in the heat treated process of quenching performance to described forging, after described forging is warming up to 600 DEG C, controls described forging and to be warming up to the process of 1052 DEG C temperature rise rate≤100 DEG C/h from 600 DEG C.
To in described steel ingot forging process, described surface of steel ingot patted by the first fire, often hammers draught≤2mm into shape, this fire time described steel ingot total deformation≤5%; Second fire strengthens the dynamics of steel ingot described in hammering gradually, often hammers draught 3 ~ 5mm into shape, this fire time described steel ingot total deformation≤15%; 3rd fiery weight impacts described steel ingot, often hammers draught >=15mm into shape, this fire time described steel ingot total deformation >=100%.
Advantage of the present invention replaces foundry goods with forging, and compared with foundry goods, forging eliminates subsurface defect, creates coherent consistent tissue, and by suitable forging and heat-treatment technology method, ensure that the over-all properties of forging excellence; In stress and the serious place of crystal internal corrosion problem, forging can both ensure longer work-ing life and Non-Defected Service.
Accompanying drawing explanation
Fig. 1 is forge piece manufacturing process schema in the present invention.
Embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that the understanding of technician of the same trade:
Embodiment: as shown in Figure 1, the present embodiment is specifically related to the manufacture method of a kind of pressurized-water reactor nuclear power plant shielding impeller forging, specifically comprises the steps:
(1) starting material
Outsourcing adopts the steel ingot smelted by EAF-VODC-VCD-LF-VD-VOH vacuum metling+electroslag remelting technique, guarantees clarity and the homogeneity of steel ingot;
(2) forge
Before forging, S41500 steel ingot should have enough resection, to ensure that forging is without shrinkage cavity with reduce segregation, and adopts suitable forging ratio to carry out overall forging on 5000T oil press, guarantee the whole cross section of forging obtain fully forging thoroughly and forging obtain suitable forging microstructure; And the forging process adopting many fire time small deformation amounts and aximal deformation value to combine, ensure the grain fineness number of forging, metal flow to and inner quality, the forging process that in the present embodiment, many fire time small deformation amounts and aximal deformation value combine is specially:
The many fire of small deformation amount: steel ingot sectional dimension comparatively large (Φ 1000*960), surface of steel ingot and core structure uneven, internal stress is very large, very easily ftracture during forging, therefore adopt the forging method of many fire time small deformation amounts in the starting stage of forging, namely, surface of steel ingot patted by first fire, to discharge steel ingot internal stress, often hammer draught≤2mm into shape, total deformation≤5% of this fire time steel ingot; Second fire strengthens hammering dynamics gradually, makes ingot structure's evenly also refinement gradually, often hammers draught 3 ~ 5mm into shape, total deformation≤15% of this fire time steel ingot; 3rd fiery weight impact steel ingot, does forging ratio, further uniform formation, crystal grain thinning, often hammers draught >=15mm into shape, total deformation >=100% of this fire time steel ingot;
Aximal deformation value: forging force is as far as possible large, and object is to prevent coarse grains, improves mechanical property, guarantees that forging one fire completes pulling, pier is thick round as a ball shaping;
(3) property heat treatment and physicochemical property process
Before property heat treatment, forging endoporus is processed, to improve heat-treat condition, and carry out Ultrasonic Nondestructive; Afterwards property heat treatment is carried out to forging, comprise Quench and temper, the steps include:
(3.1) quench:
Workpiece is warming up to 1052 DEG C (slowly to heat after being warming up to 600 DEG C, control temperature rise rate≤100 DEG C/h, to reduce the thermal stresses because forging internal-external temperature difference produces), be incubated 6.5h afterwards (according to workpiece interface Size calculation, every 100mm is at least incubated 1h), air cooling to 19 DEG C (requirement is cooled to less than 26 DEG C) subsequently, abundant to ensure material martensitic transformation, obtain the microstructure based on lath martensite, for the high strength of material and high tenacity are given security;
(3.2) tempering
Double tempering all have employed the Special back stove carrying internal circulation system, and precision reaches ± and 3 DEG C, the homogeneity of each spot temperature of forging can be met;
The Main Function of first tempering is adjustment tissue, obtains suitable martensite and the ratio of reversed austenite, for the tempering of final decision material property provides organization foundation by the tempering of proper temperature; First 680 DEG C of tempering are warming up to (in this temperature-rise period, temperature rise rate≤100 DEG C/h is controlled until reach 680 DEG C) after being warming up to more than 400 DEG C, afterwards according to the requirement insulation 16h of every 25.4mm/h, to come out of the stove after insulation to be done air cooling to 23 DEG C (requirement is cooled to less than 26 DEG C), obtain suitable martensite and the ratio of reversed austenite;
Second tempering object obtains to stablize suitable structural state, ensures that final performance meets the demands; First tempering temperature accurately to be controlled in 597 DEG C ~ 600 DEG C these narrow temperature ranges (in this temperature-rise period, temperature rise rate≤100 DEG C/h is controlled until reach 597 DEG C ~ 600 DEG C) after being warming up to more than 400 DEG C, afterwards according to the requirement insulation 16h of every 25.4mm/h, last air cooling to 20 DEG C;
By above-mentioned Quench and temper process, material finally obtains the tissue be made up of tempered sorbite and reversed austenite, and wherein the reversed austenite of needle-like is interspersed between tempered sorbite, ensure that material has good low-temperature flexibility; The control planning of tempering temperature, to the final structural state of material, ensure that the reasonably combined of the strength of materials, plasticity and toughness; Forging sample mechanical property after property heat treatment and physicochemical property process is as shown in the table, can find that the mechanical property of quenched and tempered state sample and Simulated post-weld heat treatment state sample is all far above the value of defined in index;
(4) machining
Adopt vertical lathe in the finished product course of processing, boring machine processes, guarantee size, smooth finish meets the demands;
(5) Ultrasonic Nondestructive, saw test portion, sample processing, Physicochemical test, finished product processing, visual inspection, PT inspection is carried out successively by step as shown in fig. 1 after.
Claims (3)
1. a manufacture method for pressurized-water reactor nuclear power plant canned-motor pump impeller forging, is characterized in that described manufacture method comprises the steps: to forge the steel ingot with enough resection and forms forging; Quenching property heat treatment is carried out to described forging, described forging is warming up to 1052 DEG C, air cooling to 19 DEG C after insulation 6.5h; Carry out tempering property thermal treatment to described forging afterwards, described forging is warming up to 680 DEG C, air cooling to 23 DEG C after insulation 16h, is again warming up to 597 DEG C ~ 600 DEG C and is incubated 16h, last air cooling to 20 DEG C.
2. the manufacture method of a kind of pressurized-water reactor nuclear power plant shielding impeller forging according to claim 1, it is characterized in that carrying out in the heat treated process of quenching performance to described forging, after described forging is warming up to 600 DEG C, controls described forging and to be warming up to the process of 1052 DEG C temperature rise rate≤100 DEG C/h from 600 DEG C.
3. the manufacture method of a kind of pressurized-water reactor nuclear power plant shielding impeller forging according to claim 1, is characterized in that described surface of steel ingot patted by the first fire, often hammers draught≤2mm into shape in described steel ingot forging process, this fire time described steel ingot total deformation≤5%; Second fire strengthens the dynamics of steel ingot described in hammering gradually, often hammers draught 3 ~ 5mm into shape, this fire time described steel ingot total deformation≤15%; 3rd fiery weight impacts described steel ingot, often hammers draught >=15mm into shape, this fire time described steel ingot total deformation >=100%.
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| CN201510630417.0A CN105112625B (en) | 2015-09-29 | 2015-09-29 | A kind of manufacture method of pressurized-water reactor nuclear power plant shielding impeller of pump forging |
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| CN201510630417.0A CN105112625B (en) | 2015-09-29 | 2015-09-29 | A kind of manufacture method of pressurized-water reactor nuclear power plant shielding impeller of pump forging |
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| CN105112625B CN105112625B (en) | 2018-01-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106670363A (en) * | 2016-12-20 | 2017-05-17 | 上海新闵重型锻造有限公司 | Manufacturing method for high-strength stainless steel forge piece |
| CN108588373A (en) * | 2018-05-22 | 2018-09-28 | 大连透平机械技术发展有限公司 | A kind of heat treatment method of X3CrNiMo134 materials |
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| EP0747497B1 (en) * | 1995-06-09 | 1999-05-12 | Hitachi, Ltd. | High corrosion resistant high strength austenitic sintered steel, manufacturing method and use thereof for nuclear reactor, nuclear fusion reactor and component thereof. |
| CN101169150A (en) * | 2007-11-29 | 2008-04-30 | 贵州航天新力铸锻有限责任公司 | Million - kilowatts class nuclear power station reactor main bolt production process |
| CN103320718A (en) * | 2013-05-27 | 2013-09-25 | 浙江大隆合金钢有限公司 | Method for producing austenitic stainless steel for 316 LN nuclear power |
| CN104338880A (en) * | 2013-07-31 | 2015-02-11 | 上海重型机器厂有限公司 | Method for forging 1Mn18Cr18N steel guard ring for large power station |
| CN104404356A (en) * | 2014-12-10 | 2015-03-11 | 沈阳科金特种材料有限公司 | Method for smelting return scrap of martensitic stainless steel used for impeller |
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2015
- 2015-09-29 CN CN201510630417.0A patent/CN105112625B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0747497B1 (en) * | 1995-06-09 | 1999-05-12 | Hitachi, Ltd. | High corrosion resistant high strength austenitic sintered steel, manufacturing method and use thereof for nuclear reactor, nuclear fusion reactor and component thereof. |
| CN101169150A (en) * | 2007-11-29 | 2008-04-30 | 贵州航天新力铸锻有限责任公司 | Million - kilowatts class nuclear power station reactor main bolt production process |
| CN103320718A (en) * | 2013-05-27 | 2013-09-25 | 浙江大隆合金钢有限公司 | Method for producing austenitic stainless steel for 316 LN nuclear power |
| CN104338880A (en) * | 2013-07-31 | 2015-02-11 | 上海重型机器厂有限公司 | Method for forging 1Mn18Cr18N steel guard ring for large power station |
| CN104404356A (en) * | 2014-12-10 | 2015-03-11 | 沈阳科金特种材料有限公司 | Method for smelting return scrap of martensitic stainless steel used for impeller |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106670363A (en) * | 2016-12-20 | 2017-05-17 | 上海新闵重型锻造有限公司 | Manufacturing method for high-strength stainless steel forge piece |
| CN106670363B (en) * | 2016-12-20 | 2018-08-28 | 上海新闵重型锻造有限公司 | A kind of manufacturing method of high-strength stainless steel forgings |
| CN108588373A (en) * | 2018-05-22 | 2018-09-28 | 大连透平机械技术发展有限公司 | A kind of heat treatment method of X3CrNiMo134 materials |
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| CN105112625B (en) | 2018-01-19 |
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Address after: 201109 Shanghai city Minhang District humin Road No. 3082 Patentee after: Shanghai Xinmin New Energy Technology Co.,Ltd. Address before: 201109 Shanghai city Minhang District humin Road No. 3082 Patentee before: SHANGHAI XINMIN HEAVY FORGING CO.,LTD. |
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