CN106191389A - A kind of two-step method tempering process improving nuclear power heavy forging impact flexibility - Google Patents
A kind of two-step method tempering process improving nuclear power heavy forging impact flexibility Download PDFInfo
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- CN106191389A CN106191389A CN201610741540.4A CN201610741540A CN106191389A CN 106191389 A CN106191389 A CN 106191389A CN 201610741540 A CN201610741540 A CN 201610741540A CN 106191389 A CN106191389 A CN 106191389A
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- forging
- nuclear power
- tempering process
- step method
- impact flexibility
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- 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
-
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention relates to a kind of two-step method tempering process improving nuclear power heavy forging impact flexibility, comprise the following steps: the nuclear power heating of Large Forgings after quenching to 300 450 DEG C, is incubated by (1)；(2) it is further continued for adding hot forging to 600 660 DEG C, insulation, forging furnace cooling afterwards, i.e. complete.Compared with prior art, after the present invention uses two-step method tempering process to process, the impact absorbing energy meansigma methods of steel reaches about 100J, being improved significantly compared to the impact flexibility of the nuclear power heavy forging of tradition tempering process process, and technique is simple, operation is easily achieved.
Description
Technical field
The present invention relates to metal heating processing technology field, especially relate to a kind of raising SA508Gr.3 steel nuclear power heavy forging
The two-step method tempering process of impact flexibility.
Background technology
SA508Gr.3 steel, as a kind of conventional structural material, is widely used in manufacturing nuclear pressure container, tube sheet, cylinder
The nuclear power station critical components such as body.For this steel, it is most important that provide sufficiently high intensity and high impact toughness to overcome
Contingency causes the potential safety hazard that temporary impact causes.It should be noted that in nuclear power station running owing to irradiation is crisp
Changing, the impact flexibility of steel can run down, so making steel have higher initial impact toughness by heat-treating methods is
Ensure that nuclear plant safety runs vital factor.
Through literature search, Nuclear engineering and design magazine (1997, Vol.174 (1), P51-
58) upper Kim J T et al. writes articles " Improvement of impact toughness of the SA 508class
3steel for nuclear pressure vessel through steel-making and heat-treatment
Practices (produced by improvement and Technology for Heating Processing to improve the impact of nuclear pressure container SA508Gr.3 steel tough
Property) ", this article proposes the vacuum carbon deoxidization technology by improving and reduction Si content can significantly improve nuclear power pressure vessel forging
Impact flexibility, but still it is not sufficient to ensure that the qualified of impact property 100%.
It is quilt in actual production that the SA508Gr.3 forging of quenching state is directly heated to 600-660 DEG C of tempering insulation 4-12h
The tempering process commonly used, but this traditional tempering process often leads to retained austenite and is decomposed into the bigger strip of size
Shape carbide and ferritic line and staff control so that impact absorbing energy is often unable to reach the 48J required by technical specification.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and a kind of SA508Gr.3 steel core is provided
The two-step method tempering process of TV university forging so that it is overcome the shortcoming that impact flexibility after traditional handicraft heat treatment is on the low side.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of two-step method tempering process improving nuclear power heavy forging impact flexibility, comprises the following steps:
(1) forging after quenching is heated to 300-450 DEG C, insulation；
(2) it is further continued for adding hot forging to 600-660 DEG C, insulation, steel workpiece furnace cooling afterwards, i.e. complete.
In step (1), forging is 2-6h in the time of 300-450 DEG C of insulation.
In step (2), forging is 4-12h in the time of 600-660 DEG C of insulation.
Forging material in step (1) is SA508Gr.3 steel.
The forging after quenching in step (1) is after 890 ± 10 DEG C of austenitizing insulations, the nuclear power that water hardening processes
Heavy forging, its tissue signature is bainite+residual austenite soma.
After common process heat treatment, nuclear power heavy forging often occurs larger-size strip carbide, causes steel
Impact flexibility is on the low side, and this strip carbide is at higher temperature (500-650 DEG C) by the retained austenite in steel after quenching
Decompose during tempering.
Compared with prior art, the present invention uses two-step method tempering to the nuclear power heavy forging after quenching, after first quenching
Forging 300-450 DEG C of tempering insulation, make retained austenite be completely transformed into the carbide of ferrite+tiny, add the most again
Heat to 600-660 DEG C tempering insulation, eliminates quenching stress, and disperse educt carbide particle in the base, meet hardness and
In the case of requirement of strength, the impact absorbing energy of workpiece is made to rise to about 100J.And after tradition tempering process directly will quench
Forging be heated to 600-660 DEG C of tempering insulation, cause retained austenite to be decomposed into larger-size strip carbide+ferrum element
The line and staff control of body, this larger-size strip distribution of carbides, between matrix bainite ferrite lath, is seriously broken
It is broken the seriality of matrix, causes the impact absorbing energy of workpiece to only have about 40J, and use two-step method tempering to be remarkably improved punching
Hit toughness.
Accompanying drawing explanation
Fig. 1 is the process curve figure of the present invention；
Fig. 2 is the microstructure evolution figure of the nuclear power heavy forging of the two-step method tempering process process of the present invention；
Fig. 3 is the microstructure evolution figure of the nuclear power heavy forging that conventional tempering process processes.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
Two-step method tempering process as shown in Figure 1 is used to process nuclear power heavy forging.Concretely comprise the following steps:
Lower shell forging, cylindrical φ 4417mm, wall thickness 113mm, long 4267mm, it is desirable to after tempering heat treatment, hardness is higher than
HB180 ,-21 DEG C of impact absorbing energies are more than 48J.Workpiece is after 890 DEG C of austenitizing insulations, and water hardening processes；Tempering uses
Two-step method tempering process: be first incubated 2h at 400 DEG C, then be warming up to 650 DEG C of insulation 4h, cool to room temperature with the furnace.In assigned position
Sampling detects its hardness and impact flexibility, and recording hardness is HB202, impact absorbing energy is respectively 79,95,118J, meansigma methods is
97.33J, reaches technology requirement.
Tissue before and after this forging temper is detected, as shown in Figure 2.Wherein, before Fig. 2 a is for tempering, i.e. quench
The microstructure of state；Fig. 2 b is in 400 DEG C of tempering insulation 2h, the microstructure after 650 DEG C of insulation 4h.Understand, quenching state
Retained austenite in forging resolves into tiny ferrite and carbide particle, thus is effectively increased impact flexibility.
Comparative example 1
Lower shell forging, cylindrical φ 4417mm, wall thickness 113mm, long 4267mm, it is desirable to after tempering heat treatment, hardness is higher than
HB180 ,-21 DEG C of impact absorbing energies are more than 48J.Workpiece is after 890 DEG C of austenitizing insulations, and water hardening processes；Tempering uses
Conventional tempering process: directly heat to 650 DEG C of insulation 4h, cool to room temperature with the furnace.Its impact is detected tough in assigned position sampling
Property, recording impact absorbing energy and be respectively 41J, 37J, 51J, meansigma methods only has 43J.
Tissue before and after this forging temper is detected, as shown in Figure 3.Wherein, before Fig. 3 a is for tempering, i.e. quench
The microstructure of state；Fig. 3 b is the microstructure after 650 DEG C of insulation tempering 4h.In comparative example 1, due to quenching state lower shell
Retained austenite in forging is decomposed into larger-size strip carbide+ferritic line and staff control, result in impact tough
Property does not reaches technology requirement.
Embodiment 2
Lower shell forging, cylindrical φ 4417mm, wall thickness 113mm, long 4267mm, after tempering heat treatment, hardness is higher than
HB180 ,-21 DEG C of impact absorbing energies are more than 48J.Workpiece is after 890 DEG C of austenitizing insulations, and water hardening processes；Tempering uses
Two-step method tempering process: be first incubated 2h at 350 DEG C, then be warming up to 650 DEG C of insulation 4h, cool to room temperature with the furnace.In assigned position
Sampling detects its hardness and impact flexibility, and recording hardness is HB200, impact absorbing energy is respectively 72,90,128J, meansigma methods is
96.67J, reaches technology requirement.
Embodiment 3
Cone forging, one end cylindrical φ 5626mm, other end cylindrical φ 4467mm, wall thickness 168mm, long 3187mm, it is desirable to
After tempering heat treatment, hardness is higher than HB180, and-21 DEG C of impact absorbing energies are more than 48J.Workpiece after the insulation of 890 DEG C of austenitizings, water
Cold quenching processes；Tempering uses two-step method tempering process: is first incubated 2h at 450 DEG C, then is warming up to 660 DEG C of insulation 6h, cold with stove
But to room temperature.In assigned position, sampling detects its hardness and impact flexibility, and recording hardness is HB193, and impact absorbing energy is respectively
97,105,86J, meansigma methods is 96J, reaches technology requirement.
Embodiment 4
Lower shell forging, cylindrical φ 4417mm, wall thickness 113mm, long 4267mm, it is desirable to after tempering heat treatment, hardness is higher than
HB180 ,-21 DEG C of impact absorbing energies are more than 48J.Workpiece is after 880 DEG C of austenitizing insulations, and water hardening processes；Tempering uses
Two-step method tempering process: be first incubated 4h at 420 DEG C, then be warming up to 650 DEG C of insulation 8h, cool to room temperature with the furnace.In assigned position
Sampling detects its hardness and impact flexibility, and recording hardness is HB192, impact absorbing energy is respectively 95,91,120J, meansigma methods is
102J, reaches technology requirement.
Embodiment 5
Lower shell forging, cylindrical φ 4417mm, wall thickness 113mm, long 4267mm, it is desirable to after tempering heat treatment, hardness is higher than
HB180 ,-21 DEG C of impact absorbing energies are more than 48J.Workpiece is after 900 DEG C of austenitizing insulations, and water hardening processes；Tempering uses
Two-step method tempering process: be first incubated 6h at 300 DEG C, then be warming up to 600 DEG C of insulation 12h, cool to room temperature with the furnace.In assigned position
Sampling detects its hardness and impact flexibility, and recording hardness is HB190, impact absorbing energy is respectively 98,75,85J, meansigma methods is
86J, reaches technology requirement.
Embodiment 6
Lower shell forging, cylindrical φ 4417mm, wall thickness 113mm, long 4267mm, it is desirable to after tempering heat treatment, hardness is higher than
HB180 ,-21 DEG C of impact absorbing energies are more than 48J.Workpiece is after 890 DEG C of austenitizing insulations, and water hardening processes；Tempering uses
Two-step method tempering process: be first incubated 3.5h at 380 DEG C, then be warming up to 635 DEG C of insulation 10h, cool to room temperature with the furnace.In predetermined bits
Putting sampling and detect its hardness and impact flexibility, recording hardness is HB193, impact absorbing energy is respectively 88,95,110J, meansigma methods
For 97.67J, reach technology requirement.
The above-mentioned description to embodiment is to be understood that for ease of those skilled in the art and use invention.
These embodiments obviously easily can be made various amendment by person skilled in the art, and described herein typically
Principle is applied in other embodiments without through performing creative labour.Therefore, the invention is not restricted to above-described embodiment, ability
Field technique personnel should be the present invention's according to the announcement of the present invention, the improvement made without departing from scope and amendment
Within protection domain.
Claims (6)
1. the two-step method tempering process improving nuclear power heavy forging impact flexibility, it is characterised in that comprise the following steps:
(1) forging after quenching is heated to 300-450 DEG C, insulation；
(2) it is further continued for adding hot forging to 600-660 DEG C, insulation, forging furnace cooling afterwards, i.e. complete.
A kind of two-step method tempering process improving nuclear power heavy forging impact flexibility the most according to claim 1, its feature exists
In, in step (1), forging is 2-6h in the time of 300-450 DEG C of insulation.
A kind of two-step method tempering process improving nuclear power heavy forging impact flexibility the most according to claim 1, its feature exists
In, in step (2), forging is 4-12h in the time of 600-660 DEG C of insulation.
A kind of two-step method tempering process improving nuclear power heavy forging impact flexibility the most according to claim 1, its feature exists
In, the material of the forging in step (1) is SA508Gr.3 steel.
A kind of two-step method tempering process improving nuclear power heavy forging impact flexibility the most according to claim 1, its feature exists
In, the forging after quenching in step (1) is after 880～900 DEG C of austenitizings, the nuclear power heavy forging that water hardening processes.
A kind of two-step method tempering process improving nuclear power heavy forging impact flexibility the most according to claim 5, its feature exists
In, the tissue signature of the nuclear power heavy forging that water hardening processes is bainite+residual austenite soma.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109207693A (en) * | 2017-07-04 | 2019-01-15 | 中国科学院金属研究所 | A method of improving quenched and tempered state low-alloy nodular bainite steel impact flexibility |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021304A (en) * | 2010-12-07 | 2011-04-20 | 无锡宏达重型锻压有限公司 | Heat processing technology for super-standard large-section pressure vessel tube plate |
| CN102115809A (en) * | 2011-03-04 | 2011-07-06 | 河南科技大学 | Environment-friendly heat treatment process for large shaft forgings |
| CN103290192A (en) * | 2013-06-27 | 2013-09-11 | 洛阳中创重型机械有限公司 | Thermal treatment process of spliced-welding type large tube plate forging of pressure 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 |
| 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 |
-
2016
- 2016-08-26 CN CN201610741540.4A patent/CN106191389B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021304A (en) * | 2010-12-07 | 2011-04-20 | 无锡宏达重型锻压有限公司 | Heat processing technology for super-standard large-section pressure vessel tube plate |
| CN102115809A (en) * | 2011-03-04 | 2011-07-06 | 河南科技大学 | Environment-friendly heat treatment process for large shaft forgings |
| 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 |
| 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 |
| CN103290192A (en) * | 2013-06-27 | 2013-09-11 | 洛阳中创重型机械有限公司 | Thermal treatment process of spliced-welding type large tube plate forging of pressure container |
Non-Patent Citations (2)
| Title |
|---|
| 晏广华等: "带有偏析的SA508 Gr.3钢核电大锻件在回火过程中的组织演化", 《第十一次全国热处理大会论文集》 * |
| 李昌义等: "核电站反应堆压力容器用钢的研究与应用", 《特殊钢》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109207693A (en) * | 2017-07-04 | 2019-01-15 | 中国科学院金属研究所 | A method of improving quenched and tempered state low-alloy nodular bainite steel impact flexibility |
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