CN103194581A - Control method of austenitic stainless steel large forging structure for nuclear reactor - Google Patents
Control method of austenitic stainless steel large forging structure for nuclear reactor Download PDFInfo
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- CN103194581A CN103194581A CN201310123116XA CN201310123116A CN103194581A CN 103194581 A CN103194581 A CN 103194581A CN 201310123116X A CN201310123116X A CN 201310123116XA CN 201310123116 A CN201310123116 A CN 201310123116A CN 103194581 A CN103194581 A CN 103194581A
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Abstract
The invention relates to a control method of an austenitic stainless steel large forging structure for a nuclear reactor. The control method disclosed by the invention comprises the following steps in sequence: I, rolling and heating a forging to 1210+/-10 DEG C, discharging and rolling; II, chamfering and heating the forging to 1195+/-10 DEG C, discharging and rolling; III, upsetting by heating the forging to 1180+/-10 DEG C, discharging and upsetting; IV, drawing by heating the forging to 1170+/-10 DEG C, discharging and drawing; V, upsetting by heating the forging to 1160 DEG C, discharging and upsetting; VI, drawing by heating the forging to 1160+/-10 DEG C, discharging and drawing, and sampling and checking when the total forging deformation is not less than 50%; VII, upsetting and drawing by heating the forging to 1060+/-15 DEG C, discharging, upsetting and drawing again; and VIII, drawing by heating the forging to 1060+/-15 DEG C, discharging and drawing again, cooling, sampling and checking, wherein the forging in the steps is heated and forged again after cooling to 920+/-20 DEG C. The control method disclosed by the invention is uniform in structures and can be used for controlling the grain size grade of the large forging at grades 2-3.
Description
Technical field
The present invention relates to a kind of used by nuclear reactor austenitic stainless steel heavy froging Microstructure Control method, be specifically related to a kind of fusion reactor supporting structure austenitic stainless steel heavy froging organizational controls method.
Background technology
International thermonuclear fusion experimental reactor (ITER) plan is that world today scientific and technological circle are for solving the great international cooperative programs that human future source of energy problem is carried out, this is reactor (holder gram mark device) supporting structure employing 316LN austenitic stainless steel material in the works, single strut member weight is about about 14 tons, grain fineness number requires 2 ~ 3 grades or thinner, and requires no mixed crystal.
At present, both at home and abroad for this kind material heavy froging all adopt the open die forging mode.The formulation of concrete forging process normally waits to determine its suitable forging temperature interval according to steel grade characteristic, thermoplasticity figure, recrystallize behavior, resistance to deformation.Then determine total forging ratio according to steel ingot weight, shape of ingots size, forging geomery and forging technical requirements; According to heavy froging forging process theory, determine parameters such as forging times, distortion operation, branch forging ratio at last.
Above-mentioned existing used by nuclear reactor austenitic stainless steel heavy froging Microstructure Control method, the main requirement of considering the abundant fragmentation of as-cast structure and forging saturating property, usually forge grain fineness number and can only reach 1 grade, but mixed crystal phenomenon is very serious, does not reach fusion reactor with the requirement of organizing of austenitic stainless steel heavy froging.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing used by nuclear reactor austenitic stainless steel heavy froging Microstructure Control method, the invention provides a kind of used by nuclear reactor austenitic stainless steel heavy froging Microstructure Control method, control method of the present invention is eliminated the mixed grain structure of heavy froging, and the grain size number of heavy froging is controlled at 2 ~ 3 grades.
This used by nuclear reactor austenitic stainless steel heavy froging Microstructure Control method is at first forged and is carried out the control of grain structure homogeneity.At first adopt the existing forging method of 1210 ± 10 ℃ of initial forging temperatures, 920 ± 20 ℃ of final forging temperatures, through round as a ball, chamfered edge, jumping-up, pulling. etc. operation, steel ingot is carried out hammer cogging.For forging stock grain structure before better (except the hammer cogging heating first) opens forging to each reheat is controlled, melt down heat tracing since the 2nd time, initial forging temperature once reduces by 10 ~ 15 ℃ than preceding, and final forging temperature is constant, but minimum initial forging temperature can not be lower than 1160 ℃.After melting down the heat tracing forging process through the 5-6 time, forge total deformation and be not less than 50%, the fully broken and generation recrystallize of as-cast structure, because the control to different fire time initial forging temperatures, effectively avoid the appearance of excessive coarse-grain and mixed grain structure, the inner grain fineness number of forging stock is reached about 1 grade.
Forging molding is carried out grain fineness number control then, during grain fineness number control, carries out twice reheat insulation and forges, and forges initial forging temperature at every turn and changes 1060 ± 15 ℃ into, and final forging temperature still is 920 ± 20 ℃, and forging stock is carried out forging molding.Require in the forging process: forge total deformation greater than 50%, during grain fineness number control, forge total deformation control for the first time 30 ~ 45%, forge total deformation control for the second time 20 ~ 30%.The inner grain fineness number of final forging stock reaches 2 ~ 3 grades, homogeneous microstructure.
This used by nuclear reactor austenitic stainless steel heavy froging Microstructure Control method comprises following sequential steps:
IRound as a ball
The forging of circular ESR ingot is heated to 1210 ± 10 ℃ at the resistance-type process furnace, and it is round as a ball at the flat-die forging machine to come out of the stove, and when the forging temperature drops to 920 ± 20 ℃, stops to forge;
IIChamfered edge
Forging is heated to 1195 ± 10 ℃, comes out of the stove at flat-die forging machine chamfered edge, when the forging temperature drops to 920 ± 20 ℃, stop to forge;
IIIJumping-up
Forging is heated to 1180 ± 10 ℃, comes out of the stove at flat-die forging machine jumping-up, when the forging temperature drops to 920 ± 20 ℃, stop to forge;
IVDial long
Forging is heated to 1170 ± 10 ℃, comes out of the stove that it is long at the flat-die forging machine forging of jumping-up to be dialled, when the forging temperature drops to 920 ± 20 ℃, stop to forge;
VJumping-up
Forging is heated to 1160 ℃, comes out of the stove and to dial long forging jumping-up at the flat-die forging machine, when the forging temperature drops to 920 ± 20 ℃, stop to forge;
VIDial long
Forging is heated to 1160 ℃, comes out of the stove that it is long at the flat-die forging machine forging of jumping-up to be dialled, when the forging temperature drops to 920 ± 20 ℃, stop to forge;
Forge total deformation and be not less than at 50% o'clock, sampling is in the metallography microscope spectroscopy, and grain fineness number is 1 grade;
VIIJumping-up is also dialled long
Forging is heated to 1060 ± 15 ℃, comes out of the stove and to dial long forging jumping-up at the flat-die forging machine, dial longly again, forge total deformation control 30 ~ 45%, when the forging temperature drops to 920 ± 20 ℃, stop to forge;
VIIIDial long
Forging is heated to 1060 ± 15 ℃, comes out of the stove and will dial long forging at the flat-die forging machine and dial longly again, total deformation is controlled 20 ~ 30%, when the forging temperature drops to 920 ± 20 ℃, stops to forge; And in air, cool off, sampling is in the metallography microscope spectroscopy, and grain fineness number is 2 ~ 3 grades.Homogeneous microstructure, no mixed crystal phenomenon.
The flat-die forging machine of above-mentioned used by nuclear reactor austenitic stainless steel heavy froging Microstructure Control method generally is 5000t flat-die forging machine.
Above-mentioned used by nuclear reactor austenitic stainless steel heavy froging Microstructure Control method, the material of described austenitic stainless steel heavy froging are any 316L, the 316LN, 304 or 317LN of following material.
Except kind was implemented in test, the present invention can also be suitable for other austenitic stainless steel heavy frogings, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.
Used by nuclear reactor austenitic stainless steel heavy froging Microstructure Control method of the present invention, the mixed grain structure of elimination heavy froging, homogeneous microstructure controls the grain size number of heavy froging at 2 ~ 3 grades.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment
The material of present embodiment is the 316LN austenitic stainless steel, adopts circular ESR ingot (weighing 20 tons), length 1.92m.
Present embodiment comprises following sequential steps:
IRound as a ball
The forging of circular ESR ingot is heated to 1210 ℃ at the resistance-type process furnace, and it is round as a ball at 5000t flat-die forging machine to come out of the stove, and when the forging temperature drops to 920 ℃, stops to forge;
IIChamfered edge
Forging is heated to 1195 ℃, comes out of the stove at 5000t flat-die forging machine chamfered edge, when the forging temperature drops to 920 ℃, stop to forge;
IIIJumping-up
Forging is heated to 1180 ℃, comes out of the stove at 5000t flat-die forging machine jumping-up, when the forging temperature drops to 920 ℃, stop to forge;
IVDial long
Forging is heated to 1170 ℃, comes out of the stove that it is long at 5000t flat-die forging machine the forging of jumping-up to be dialled, when the forging temperature drops to 920 ℃, stop to forge;
VJumping-up
Forging is heated to 1160 ℃, comes out of the stove and to dial long forging jumping-up at 5000t flat-die forging machine, when the forging temperature drops to 920 ℃, stop to forge;
VIDial long
Forging is heated to 1160 ℃, comes out of the stove that it is long at 5000t flat-die forging machine the forging of jumping-up to be dialled, total deformation is 50%, when the forging temperature drops to 920 ℃, stops to forge; Sampling is in the metallography microscope spectroscopy, and grain fineness number is 1 grade;
VIIJumping-up is also dialled long
Forging is heated to 1060 ℃, comes out of the stove and will dial long forging jumping-up at 5000t flat-die forging machine, dial longly again, deflection is 40%, when the forging temperature drops to 920 ℃, stops to forge;
VIIIDial long
Forging is heated to 1060 ℃, comes out of the stove and will dial long forging at 5000t flat-die forging machine and dial longly again, deflection is 25%, when the forging temperature drops to 920 ℃, stops to forge; And in air, cool off, sampling is in the metallography microscope spectroscopy, and grain fineness number is 2.5 grades.Homogeneous microstructure, no mixed crystal phenomenon.
The method of present embodiment is suitable for other austenitic stainless steel heavy frogings, i.e. a kind of 316L of following arbitrary material, 304,317LN.
Claims (2)
1. used by nuclear reactor austenitic stainless steel heavy froging Microstructure Control method, it comprises following sequential steps:
IRound as a ball
The forging of circular ESR ingot is heated to 1210 ± 10 ℃, and it is round as a ball at the flat-die forging machine to come out of the stove, and when the forging temperature drops to 920 ± 20 ℃, stops to forge;
IIChamfered edge
Forging is heated to 1195 ± 10 ℃, comes out of the stove at flat-die forging machine chamfered edge, when the forging temperature drops to 920 ± 20 ℃, stop to forge;
IIIJumping-up
Forging is heated to 1180 ± 10 ℃, comes out of the stove at flat-die forging machine jumping-up, when the forging temperature drops to 920 ± 20 ℃, stop to forge;
IVDial long
Forging is heated to 1170 ± 10 ℃, comes out of the stove that it is long at the flat-die forging machine forging of jumping-up to be dialled, when the forging temperature drops to 920 ± 20 ℃, stop to forge;
VJumping-up
Forging is heated to 1160 ℃, comes out of the stove and to dial long forging jumping-up at the flat-die forging machine, when the forging temperature drops to 920 ± 20 ℃, stop to forge;
VIDial long
Forging is heated to 1160 ℃, comes out of the stove that it is long at the flat-die forging machine forging of jumping-up to be dialled, when the forging temperature drops to 920 ± 20 ℃, stop to forge;
Forge total deformation and be not less than at 50% o'clock, take a sample to check, grain fineness number is 1 grade;
VIIJumping-up is also dialled long
Forging is heated to 1060 ± 15 ℃, comes out of the stove and to dial long forging jumping-up at the flat-die forging machine, dial longly again, forge total deformation control 30 ~ 45%, when the forging temperature drops to 920 ± 20 ℃, stop to forge;
VIIIDial long
Forging is heated to 1060 ± 15 ℃, comes out of the stove and will dial long forging at the flat-die forging machine and dial longly again, total deformation is controlled 20 ~ 30%, when the forging temperature drops to 920 ± 20 ℃, stops to forge; And in air, cool off, to take a sample to check, grain fineness number is 2 ~ 3 grades.
2. used by nuclear reactor austenitic stainless steel heavy froging Microstructure Control method according to claim 1 is characterized in that: the material of described austenitic stainless steel heavy froging is any 316L, the 316LN, 304 or 317LN of following material.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104162616A (en) * | 2014-08-26 | 2014-11-26 | 贵州航天新力铸锻有限责任公司 | Method for forging double-lug U-shaped forged piece for thermonuclear fusion reactor |
| CN104174796A (en) * | 2014-08-08 | 2014-12-03 | 东北大学 | Manufacturing method of stainless steel large forging for thermonuclear fusion reactor |
| CN104384847A (en) * | 2014-10-09 | 2015-03-04 | 贵州航天新力铸锻有限责任公司 | Binaural U-shaped piece welding-free integrated finish machining method for thermonuclear fusion reactor |
| CN104630437A (en) * | 2015-01-21 | 2015-05-20 | 山西太钢不锈钢股份有限公司 | Method for manufacturing large size tube blanks for power station boilers |
| CN104726660A (en) * | 2015-03-13 | 2015-06-24 | 上海交通大学 | Forging method for increasing corrosion resistance of 316 LN stainless steel |
| CN106048157A (en) * | 2016-06-30 | 2016-10-26 | 安徽省瑞杰锻造有限责任公司 | Method for forging 316LN stainless steel forge piece |
| CN114273574A (en) * | 2021-04-02 | 2022-04-05 | 中国科学院金属研究所 | Forging method for controlling structural uniformity of large-size easy-segregation austenitic stainless steel bar |
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| CN102091751A (en) * | 2010-12-03 | 2011-06-15 | 太原科技大学 | Control method for 316 LN steel heavy-forging forging crystalline grain |
| CN102828009A (en) * | 2011-06-17 | 2012-12-19 | 上海重型机器厂有限公司 | Forging method of austenitic stainless steel forged piece for in-reactor component of nuclear power station reactor |
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| CN101376156A (en) * | 2007-08-28 | 2009-03-04 | 上海重型机器厂有限公司 | Method for forging and pressing component reactor core fulcrum table forging in nuclear pile |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104174796A (en) * | 2014-08-08 | 2014-12-03 | 东北大学 | Manufacturing method of stainless steel large forging for thermonuclear fusion reactor |
| CN104162616A (en) * | 2014-08-26 | 2014-11-26 | 贵州航天新力铸锻有限责任公司 | Method for forging double-lug U-shaped forged piece for thermonuclear fusion reactor |
| CN104162616B (en) * | 2014-08-26 | 2016-01-27 | 贵州航天新力铸锻有限责任公司 | Thermonuclear fusion heap ears U-shaped forging forging method |
| CN104384847A (en) * | 2014-10-09 | 2015-03-04 | 贵州航天新力铸锻有限责任公司 | Binaural U-shaped piece welding-free integrated finish machining method for thermonuclear fusion reactor |
| CN104384847B (en) * | 2014-10-09 | 2016-07-06 | 贵州航天新力铸锻有限责任公司 | Thermonuclear fusion heap ears U-shaped part welding entirety precision machining method |
| CN104630437A (en) * | 2015-01-21 | 2015-05-20 | 山西太钢不锈钢股份有限公司 | Method for manufacturing large size tube blanks for power station boilers |
| CN104630437B (en) * | 2015-01-21 | 2016-09-21 | 山西太钢不锈钢股份有限公司 | A kind of station boiler manufacture method of the heat-resisting pipe of big specification |
| CN104726660A (en) * | 2015-03-13 | 2015-06-24 | 上海交通大学 | Forging method for increasing corrosion resistance of 316 LN stainless steel |
| CN106048157A (en) * | 2016-06-30 | 2016-10-26 | 安徽省瑞杰锻造有限责任公司 | Method for forging 316LN stainless steel forge piece |
| CN114273574A (en) * | 2021-04-02 | 2022-04-05 | 中国科学院金属研究所 | Forging method for controlling structural uniformity of large-size easy-segregation austenitic stainless steel bar |
| CN114273574B (en) * | 2021-04-02 | 2022-08-23 | 中国科学院金属研究所 | Forging method for controlling structural uniformity of large-size easy-segregation austenitic stainless steel bar |
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Application publication date: 20130710 |