CN102728771A - Method for forging nuclear island spindle - Google Patents
Method for forging nuclear island spindle Download PDFInfo
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- CN102728771A CN102728771A CN2012102113503A CN201210211350A CN102728771A CN 102728771 A CN102728771 A CN 102728771A CN 2012102113503 A CN2012102113503 A CN 2012102113503A CN 201210211350 A CN201210211350 A CN 201210211350A CN 102728771 A CN102728771 A CN 102728771A
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Abstract
The invention discloses a method for forging a nuclear island spindle. The method comprises the following steps of: (1) selecting materials; (2) loading the selected materials into a furnace for heating for the first time; (3) forging; (4) loading the materials into the furnace for the second time; (5) forging and molding; and (6) performing heat treatment namely heating a forged piece obtained in the (5) to the temperature of between 920 and 980 DEG C, preserving the heat for 6 to 10 hours at the temperature of between 920 and 980 DEG C, and cooling the forged piece to room temperature in air. According to the method for forging the nuclear island spindle, steel ingots with high temperature resistance and high corrosion resistance are heated at the high temperature, forged and welded to overcome internal defects at the early stage and heated and molded at the low temperature at the later stage to refine internal tissues, so that related ultrasonic flaw detection requirements and granularity requirements can be met, and safety and reliability of the nuclear island spindle are ensured.
Description
Technical field
The present invention relates to a kind of forging method of nuclear island main shaft.
Background technology
According to the medium-term and long-term nuclear power developing planning of China, will reach 4,000 ten thousand kilowatts to the year two thousand twenty China nuclear energy power generation total amount.In order to adapt to the speed of China's nuclear power developing, China is the manufacturing process of each key equipment in the active research nuclear island just.
Presurized water reactor one circuit cools agent circulating pump, just main pump is a nuclear safety one-level equipment, and main shaft and retaining ring are most important two building blocks of main pump, so main shaft is as important composition parts in the nuclear power station, and its security is most important.How to forge high performance main shaft, improving its intensity, toughness and corrosion resistance is China nuclear staff urgent problem.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can eliminate nuclear island main shaft internal flaw, improve the forging method of the nuclear island main shaft of nuclear island main shaft safe operating life.
For achieving the above object, the forging method of nuclear island main shaft of the present invention may further comprise the steps:
(1) selection, selection has the steel ingot of following percentage by weight: C≤0.35%, Si≤0.80%, Mn≤2.00%; P≤0.020%, S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%; 2.25%≤Mo≤2.75%, N≤0.080%, B≤0.0010%, Cu≤0.50%; Co≤0.10%, Nb≤0.15%, surplus is Fe and impurity;
(2) shove charge is heated for the first time, the steel ingot of selecting for use is packed into heat in the cell-type gas heating furnace, and heating-up temperature is 1250～1280 ℃, and in these 1250～1280 ℃ of temperature ranges, is incubated 5～6 hours;
(3) forge; On the 8MN hydraulic press, heated steel ingot is carried out twice upsetting pull, guarantee that the ratio of upsetting pull for the first time is: 1.3≤upset ratio≤1.5,1.1≤pulling is than≤1.3; The ratio of upsetting pull for the second time is: 1.0≤upset ratio≤1.2; 0.8≤pulling is than≤1.0, and guarantees that initial forging temperature is 1250～1280 ℃, final forging temperature>=850 ℃;
(4) shove charge is heated for the second time, the steel ingot after forging is packed into heat in the cell-type gas heating furnace, and heating-up temperature is 1050～1100 ℃, and in these 1050～1100 ℃ of temperature ranges, is incubated 2～3 hours;
(5) forging forming forges into the forging that meets size with the steel ingot of gained in the step (4) on the 8MN hydraulic press;
(6) heat treatment is heated to 920～980 ℃ with the forging of step (5) gained, and in these 920～980 ℃ of temperature ranges, is incubated 6～10 hours, then with the forging air cooling to room temperature.
Preferably, in the step (2), up to being warming up to 1260 ℃, programming rate≤180 ℃/h so can make the forging internal flaw eliminate basically from igniting;
Preferably, heating-up temperature is 1260～1270 ℃ in the step (2);
Preferably, the ratio of upsetting pull for the first time is in the step (3): 1.35≤upset ratio≤1.45,1.15≤pulling is than≤1.25, and the ratio of upsetting pull for the second time is: 1.05≤upset ratio≤1.15,0.85≤pulling is than≤0.95;
Preferably, heating-up temperature is 1070～1080 ℃ in the step (4);
Preferably, in the step (6) forging is heated to 950～960 ℃.
Beneficial effect of the present invention: the forging method of nuclear island main shaft of the present invention is through forging and pressing the seam internal flaw with the steel ingot heat in early stage high temperature resistant, that corrosion resistance is good; Later stage low-temperature heat moulding refinement interior tissue; Can reach that relevant ultrasonic examination requires and the grain size requirement, guarantee the security reliability of nuclear island main shaft.
The specific embodiment
For technical scheme of the present invention more clearly is described, the present invention is further described below in conjunction with embodiment.
Embodiment 1:
The forging method of nuclear island main shaft of the present invention may further comprise the steps:
(1) selection, selection has the steel ingot of following percentage by weight: C≤0.35%, Si≤0.80%, Mn≤2.00%; P≤0.020%, S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%; 2.25%≤Mo≤2.75%, N≤0.080%, B≤0.0010%, Cu≤0.50%; Co≤0.10%, Nb≤0.15%, surplus is Fe and impurity; The steel ingot of this component is high temperature resistant, corrosion resistance good, proves the optimal material of nuclear island main shaft through a large amount of experiments.Steel ingot is cylindrical, its diameter of phi >=600mm;
(2) shove charge is heated for the first time; The steel ingot of selecting for use packed into heat in the cell-type gas heating furnace, heating-up temperature is 1260 ℃, and insulation 6 hours in these 1260 ℃ of temperature ranges; Wherein steel ingot from igniting up to being warming up to 1260 ℃, programming rate≤180 ℃/h;
(3) forge, on the 8MN hydraulic press, heated steel ingot is carried out twice upsetting pull, guarantee that the ratio of upsetting pull for the first time is: upset ratio is 1.3; Pulling is than being 1.1, and the ratio of upsetting pull for the second time is: upset ratio is 1.0, pulls out than being 0.8; And guarantee that initial forging temperature is 1260 ℃, final forging temperature >=850 ℃;
(4) shove charge is heated for the second time, the steel ingot after forging is packed into heat in the cell-type gas heating furnace, and heating-up temperature is 1070 ℃, and insulation is no more than 3 hours in these 1070 ℃ of temperature ranges;
(5) forging forming forges into the forging that meets size with the steel ingot of gained in the step (4) on the 8MN hydraulic press;
(6) heat treatment is carried out normalized treatment to the forging of step (5) gained, be about to forging and be heated to 950 ℃, and insulation 6 hours in these 950 ℃ of temperature ranges, then with the forging air cooling to room temperature.
Embodiment 2:
The forging method of nuclear island main shaft of the present invention may further comprise the steps:
(1) selection, selection has the steel ingot of following percentage by weight: C≤0.35%, Si≤0.80%, Mn≤2.00%; P≤0.020%, S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%; 2.25%≤Mo≤2.75%, N≤0.080%, B≤0.0010%, Cu≤0.50%; Co≤0.10%, Nb≤0.15%, surplus is Fe and impurity; The steel ingot of this component is high temperature resistant, corrosion resistance good, proves the optimal material of nuclear island main shaft through a large amount of experiments.Steel ingot is cylindrical, its diameter of phi >=600mm;
(2) shove charge is heated for the first time; The steel ingot of selecting for use packed into heat in the cell-type gas heating furnace, heating-up temperature is 1270 ℃, and insulation 5 hours in these 1270 ℃ of temperature ranges; Wherein steel ingot from igniting up to being warming up to 1270 ℃, programming rate≤160 ℃/h;
(3) forge, on the 8MN hydraulic press, heated steel ingot is carried out twice upsetting pull, guarantee that the ratio of upsetting pull for the first time is: upset ratio is 1.4; Pulling is than being 1.2, and the ratio of upsetting pull for the second time is: upset ratio is 1.1, pulls out than being 0.9; Initial forging temperature is 1270 ℃, final forging temperature >=850 ℃;
(4) shove charge is heated for the second time, the steel ingot after forging is packed into heat in the cell-type gas heating furnace, and heating-up temperature is 1080 ℃, and insulation 2 hours in these 1080 ℃ of temperature ranges;
(5) forging forming forges into the forging that meets size with the steel ingot of gained in the step (4) on the 8MN hydraulic press;
(6) heat treatment is carried out normalized treatment to the forging of step (5) gained, be about to forging and be heated to 960 ℃, and insulation 6 hours in these 960 ℃ of temperature ranges, then with the forging air cooling to room temperature.
Embodiment 3:
The forging method of nuclear island main shaft of the present invention may further comprise the steps:
(1) selection, selection has the steel ingot of following percentage by weight: C≤0.35%, Si≤0.80%, P≤0.020%; S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%, 2.25%≤Mo≤2.75%; N≤0.080%, B≤0.0010%, Cu≤0.50%; Co≤0.10%, Nb≤0.15%, surplus is Fe and impurity; The steel ingot of this component is high temperature resistant, corrosion resistance good, proves the optimal material of nuclear island main shaft through a large amount of experiments.Steel ingot is cylindrical, its diameter of phi >=600mm;
(2) shove charge is heated for the first time; The steel ingot of selecting for use packed into heat in the cell-type gas heating furnace, heating-up temperature is 1250 ℃, and insulation 6 hours in these 1250 ℃ of temperature ranges; Wherein steel ingot from igniting up to being warming up to 1250 ℃, programming rate≤180 ℃/h;
(3) forge, on the 8MN hydraulic press, heated steel ingot is carried out twice upsetting pull, guarantee that the ratio of upsetting pull for the first time is: upset ratio is 1.3; Pulling is than being 1.1, and the ratio of upsetting pull for the second time is: upset ratio is 1.0, pulls out than being 0.8; And guarantee that initial forging temperature is 1250 ℃, final forging temperature >=850 ℃;
(4) shove charge is heated for the second time, the steel ingot after forging is packed into heat in the cell-type gas heating furnace, and heating-up temperature is 1070 ℃, and insulation 2 hours in these 1070 ℃ of temperature ranges;
(5) forging forming forges into the forging that meets size with the steel ingot of gained in the step (4) on the 8MN hydraulic press;
(6) heat treatment is carried out normalized treatment to the forging of step (5) gained, be about to forging and be heated to 950 ℃, and insulation 6 hours in these 950 ℃ of temperature ranges, then with the forging air cooling to room temperature.
Embodiment 3:
The forging method of nuclear island main shaft of the present invention may further comprise the steps:
(1) selection, selection has the steel ingot of following percentage by weight: C≤0.35%, Si≤0.80%, P≤0.020%; S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%, 2.25%≤Mo≤2.75%; N≤0.080%, B≤0.0010%, Cu≤0.50%; Co≤0.10%, Nb≤0.15%, surplus is Fe and impurity; The steel ingot of this component is high temperature resistant, corrosion resistance good, proves the optimal material of nuclear island main shaft through a large amount of experiments.Steel ingot is cylindrical, its diameter of phi >=600mm;
(2) shove charge is heated for the first time; The steel ingot of selecting for use packed into heat in the cell-type gas heating furnace, heating-up temperature is 1280 ℃, and insulation 5 hours in these 1280 ℃ of temperature ranges; Wherein steel ingot from igniting up to being warming up to 1280 ℃, programming rate≤160 ℃/h;
(3) forge, on the 8MN hydraulic press, heated steel ingot is carried out twice upsetting pull, guarantee that the ratio of upsetting pull for the first time is: upset ratio is 1.4; Pulling is than being 1.2, and the ratio of upsetting pull for the second time is: upset ratio is 1.1, pulls out than being 0.9; Initial forging temperature is 1280 ℃, final forging temperature >=850 ℃;
(4) shove charge is heated for the second time, the steel ingot after forging is packed into heat in the cell-type gas heating furnace, and heating-up temperature is 1050 ℃, and insulation 3 hours in these 1080 ℃ of temperature ranges;
(5) forging forming forges into the forging that meets size with the steel ingot of gained in the step (4) on the 8MN hydraulic press;
(6) heat treatment is carried out normalized treatment to the forging of step (5) gained, be about to forging and be heated to 960 ℃, and insulation 6 hours in these 960 ℃ of temperature ranges, then with the forging air cooling to room temperature.
The above is merely preferred embodiment of the present invention, is not restriction with the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the forging method of a nuclear island main shaft may further comprise the steps:
(1) selection, selection has the steel ingot of following percentage by weight: C≤0.35%, Si≤0.80%, Mn≤2.00%; P≤0.020%, S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%; 2.25%≤Mo≤2.75%, N≤0.080%, B≤0.0010%, Cu≤0.50%; Co≤0.10%, Nb≤0.15%, surplus is Fe and impurity;
(2) shove charge is heated for the first time, the steel ingot of selecting for use is packed into heat in the cell-type gas heating furnace, and heating-up temperature is 1250～1280 ℃, and in these 1250～1280 ℃ of temperature ranges, is incubated 5～6 hours;
(3) forge; On the 8MN hydraulic press, heated steel ingot is carried out twice upsetting pull, guarantee that the ratio of upsetting pull for the first time is: 1.3≤upset ratio≤1.5,1.1≤pulling is than≤1.3; The ratio of upsetting pull for the second time is: 1.0≤upset ratio≤1.2; 0.8≤pulling is than≤1.0, and guarantees that initial forging temperature is 1250～1280 ℃, final forging temperature>=850 ℃;
(4) shove charge is heated for the second time, the steel ingot after forging is packed into heat in the cell-type gas heating furnace, and heating-up temperature is 1050～1100 ℃, and in these 1050～1100 ℃ of temperature ranges, is incubated 2～3 hours;
(5) forging forming forges into the forging that meets size with the steel ingot of gained in the step (4) on the 8MN hydraulic press;
(6) heat treatment is heated to 920～980 ℃ with the forging of step (5) gained, and in these 920～980 ℃ of temperature ranges, is incubated 6～10 hours, then with the forging air cooling to room temperature.
2. the forging method of nuclear island main shaft as claimed in claim 1 is characterized in that, preferably, in the step (2), up to being warming up to 1260 ℃, programming rate≤180 ℃/h so can make the forging internal flaw eliminate basically from igniting.
3. the forging method of nuclear island main shaft as claimed in claim 1 is characterized in that, preferably, heating-up temperature is 1260～1270 ℃ in the step (2).
4. the forging method of nuclear island main shaft as claimed in claim 1 is characterized in that, preferably; The ratio of upsetting pull for the first time is in the step (3): 1.35≤upset ratio≤1.45; 1.15≤pulling is than≤1.25, the ratio of upsetting pull for the second time is: 1.05≤upset ratio≤1.15,0.85≤pulling is than≤0.95.
5. the forging method of nuclear island main shaft as claimed in claim 1 is characterized in that, preferably, heating-up temperature is 1070～1080 ℃ in the step (4).
6. the forging method of nuclear island main shaft as claimed in claim 1 is characterized in that, preferably, in the step (6) forging is heated to 950～960 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012102113503A CN102728771A (en) | 2012-06-26 | 2012-06-26 | Method for forging nuclear island spindle |
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| CN2012102113503A CN102728771A (en) | 2012-06-26 | 2012-06-26 | Method for forging nuclear island spindle |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921852A (en) * | 2012-11-14 | 2013-02-13 | 西部钛业有限责任公司 | Preparation method of Ti31 titanium alloy flange forge piece |
| CN103894792A (en) * | 2014-02-26 | 2014-07-02 | 陕西华威锻压有限公司 | Method for machining forge piece of large-scale single-flange anti-explosion motor main shaft of all-fiber texture |
| CN106077415A (en) * | 2016-08-24 | 2016-11-09 | 江苏金源高端装备股份有限公司 | A kind of Forging Technology of nuclear island spindle |
| CN107747032A (en) * | 2017-09-30 | 2018-03-02 | 张家港中环海陆特锻股份有限公司 | Aviation high-toughness long-life large rotor forged shaft manufacturing process |
| CN113369811A (en) * | 2021-06-04 | 2021-09-10 | 成都日进冶金锻造有限公司 | Production process of hydrogen sulfide corrosion resistant forge piece |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102921852A (en) * | 2012-11-14 | 2013-02-13 | 西部钛业有限责任公司 | Preparation method of Ti31 titanium alloy flange forge piece |
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| CN106077415A (en) * | 2016-08-24 | 2016-11-09 | 江苏金源高端装备股份有限公司 | A kind of Forging Technology of nuclear island spindle |
| CN106077415B (en) * | 2016-08-24 | 2018-12-25 | 江苏金源高端装备股份有限公司 | A kind of forging technology of nuclear island spindle |
| CN107747032A (en) * | 2017-09-30 | 2018-03-02 | 张家港中环海陆特锻股份有限公司 | Aviation high-toughness long-life large rotor forged shaft manufacturing process |
| CN113369811A (en) * | 2021-06-04 | 2021-09-10 | 成都日进冶金锻造有限公司 | Production process of hydrogen sulfide corrosion resistant forge piece |
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Application publication date: 20121017 |