CN107245563A - It is a kind of to improve indissoluble delta ferrite solid solution speed in martensite type refractory steel ingot casting while the technology of fining austenite grains - Google Patents
It is a kind of to improve indissoluble delta ferrite solid solution speed in martensite type refractory steel ingot casting while the technology of fining austenite grains Download PDFInfo
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- CN107245563A CN107245563A CN201710556741.1A CN201710556741A CN107245563A CN 107245563 A CN107245563 A CN 107245563A CN 201710556741 A CN201710556741 A CN 201710556741A CN 107245563 A CN107245563 A CN 107245563A
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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Abstract
The present invention provide it is a kind of improve organized after high temperature long-time solid solution in there is the technologies of the fining austenite grains simultaneously of delta ferrite solid solution speed in the martensite type refractory steel ingot casting of indissoluble delta ferrite, the technology for producing a large amount of lattice defects inside delta ferrite is set to improve the solid solution speed of the delta ferrite after high temperature long-time solid solution in martensite heat-resistant steel ingot casting using lower temperature (below steel grade AUSTENITE GRAIN COARSENING temperature) austenitizing and deformation, while obtaining tiny austenite crystal.The martensite type refractory steel ingot casting after 1180~1200 DEG C of 8~10h of high temperature solid solution is cooled to room temperature first, it is then heated to 1000~1050 DEG C of austenitizings, then the compression of 60% amount deformed above is carried out, so as to improve the solid solution speed of delta ferrite, while obtaining tiny austenite crystal.The advantage of the invention is to be greatly enhanced delta ferrite solid solution speed fining austenite grains, and step is simple simultaneously in the martensite type refractory steel ingot casting that there is indissoluble delta ferrite after high temperature long-time solid solution in tissue.
Description
Technical field
It is more particularly to a kind of to improve after high temperature long-time solid solution the invention belongs to non-equilibrium phase research field in metal structure
There is delta ferrite solid solution speed in the martensite type refractory steel ingot casting of indissoluble delta ferrite in tissue while fining austenite grains
Technology.
Background technology
Delta ferrite is the non-equilibrium phase in martensite type refractory steel, and the delta ferrite in forging material is each to mechanical property to same
Property, low-temperature flexibility and welding performance etc. are highly unwanted, it is therefore necessary to be completely eliminated.Typically all contain in martensite type refractory steel ingot casting
There is delta ferrite in more delta ferrite, ingot casting to be eliminated by the method for solid solution, delta ferrite exists in martensite heat-resistant steel ingot casting
The incipient stage solid solution speed of solid solution is higher, eliminates very fast, extends with solution time, delta ferrite solid solution speed drastically declines, passes through
After long-time solid solution, often can still there are some indissoluble delta ferrites, these delta ferrite solid solutions speed in martensite heat-resistant steel tissue
Rate is extremely low, it is necessary to which extremely prolonged solid solution can just be completely eliminated, and prolonged high temperature solid solution often brings serious austenite
The negative consequences such as grain coarsening, cause the serious energy and waste of material, it is therefore necessary to improve the long-time solid solution of these in ingot casting
The solid solution speed of the indissoluble delta ferrite still suffered from organizing afterwards is to reduce the high temperature solid solution time, while fining austenite grains.
At present, the method for improving non-equilibrium phase solid solution speed in metal is typically to improve solid solubility temperature, but martensite type is resistance to
Hot steel is influenceed by its phase transition temperature, and solid solubility temperature is difficult to improve, and solid solubility temperature is too high can not only to eliminate delta ferrite, on the contrary
New delta ferrite can be separated out, therefore, martensite heat-resistant steel solid solubility temperature is usually 1180~1200 DEG C, and solution time is typically 8
~10h, but due to the extension with solution time, delta ferrite solid solution speed drastically declines, therefore, often consolidates for 1180~1200 DEG C
Some indissoluble delta ferrites are still suffered from being organized after molten 8~10h, and due to high temperature long-time solid solution, austenite crystal is thick.
Chinese patent CN201410571886.5 provides a kind of method for eliminating delta ferrite in martensite type refractory steel,
Delta ferrite is occurred dynamic recrystallization by high temperature deformation, increase delta ferrite inside crystal boundary to improve delta ferrite solid solution speed,
But there is the problem of solid solubility temperature is high, soaking time is long in it, and high temperature solid solution and high temperature deformation cause austenite crystal after forging
It is thick, organize more thick after heat treatment.
The content of the invention
In order to overcome above-mentioned deficiency, the present invention provides a kind of improve and organized after long-time solid solution in martensite type refractory steel
The indissoluble delta ferrite solid solution speed of presence is while the technology of fining austenite grains.The present invention is for martensite type refractory steel casting
The problem of there is indissoluble delta ferrite and thick austenite crystal in being organized after ingot high temperature long-time solid solution, utilizes lower temperature
Austenitizing, and deform to improve the solid solution speed of this indissoluble delta ferrite in relatively low austenitic temperature is interval, refine simultaneously
Austenite crystal.
In order to improve indissoluble delta ferrite present in tissue after martensite heat-resistant steel ingot casting high temperature long-time solid solution
Solid solution speed and fining austenite grains, the present invention have carried out system research to the solid solution rule of these indissoluble delta ferrites, it is intended to
The solid solution speed of these indissoluble delta ferrites is improved by the adjustment of temperature and compression ratio, while fining austenite grains, but knot
It is really not satisfactory.Chanced in follow-up study：After 1180~1200 DEG C of 8~10h of high temperature solid solution
10Cr12Ni3Mo2VN, KT5331 ingot casting, are first cooled to room temperature, are then again heated to 1000~1050 DEG C of (steel grade austenite crystals
Below grain Coarsening Temperature) austenitizing is carried out, now, austenitizing temperature is relatively low, and austenite crystal is comparatively fine, if being become
When shape ratio is more than 60% compression, indissoluble present in tissue after ingot casting high temperature long-time solid solution can have both been effectively improved
The solid solution speed of delta ferrite, and tiny austenite crystal can be obtained, meanwhile, above-mentioned steel grade plasticity is good at this temperature, will not
There is forging crack.Because delta ferrite reply degree is low when being deformed in relatively low austenitic temperature is interval, δ iron after deformation
A large amount of lattice defects can be produced inside ferritic, delta ferrite solid solution speed can be dramatically increased, simultaneously because austenitizing temperature
Low, deformation temperature is relatively low, and deflection is larger, therefore, it is possible to obtain tiny austenite crystal.
To achieve these goals, the present invention is adopted the following technical scheme that：
It is a kind of to improve δ in the martensite type refractory steel ingot casting that there is indissoluble delta ferrite after high temperature long-time solid solution in tissue
Higher content speed simultaneously fining austenite grains method,
Martensite type refractory steel ingot casting after 1180~1200 DEG C of 8~10h of high temperature solid solution is cooled to room temperature, then heated
Make martensite type refractory steel ingot casting austenite (below steel grade AUSTENITE GRAIN COARSENING temperature) in relatively low austenitic temperature interval
Change；
By the ingot casting compression more than 60% of austenitizing in said temperature is interval.
It is preferred that, the austenitic temperature interval is 1000~1050 DEG C.
It is preferred that, the martensite type refractory steel ingot casting is 10Cr12Ni3Mo2VN, KT5331 ingot casting.
It is furthermore preferred that the 10Cr12Ni3Mo2VN ingot castings are made up of the chemical element of following parts by weight：C：0.10%,
Si：0.22%, Mn：0.78%, Cr：12.0%, Ni：2.50%, Mo：1.65%, V：0.32%, N：0.033%.
It is preferred that, the KT5331 ingot castings are made up of the chemical element of following parts by weight：C：0.11%, Si：0.20%,
Mn：0.52%, Cr：10.80%, Ni：0.61%, W：2.63%, Co：2.72%, Nb：0.12%, Mo：0.31%, V：
0.22%, N：0.028%, B：0.025%.
Unless otherwise specified, the percentage in the present invention is all weight percentage.
Beneficial effects of the present invention
(1) present invention makes martensite type refractory steel ingot casting high temperature solid for a long time using the deformation of relatively low austenitic temperature interval
The technology for producing a large amount of lattice defects after molten inside indissoluble delta ferrite present in tissue improves consolidating for this indissoluble delta ferrite
Molten speed, while obtaining tiny austenite crystal by lower temperature austenitizing and large deformation.First by 1180~1200
Martensite type refractory steel ingot casting after DEG C 8~10h of high temperature solid solution is cooled to room temperature, is then heated to 1000~1050 DEG C, then
The compression of 60% amount deformed above is carried out, while steel plasticity is ensured, by increasing δ iron in relatively low temperature deformation
Ferritic internal crystal framework defect, promotes the balance diffusion rate of alloying element, so as to improve the solid solution speed of delta ferrite, obtains simultaneously
Obtain more tiny austenite crystal.The advantage of the invention is that martensite type refractory steel ingot casting high temperature can be greatly enhanced long
The solid solution speed of indissoluble delta ferrite present in tissue after time solid solution, while tiny austenite crystal is obtained, and step letter
It is single.
(2) processing method of the present invention is simple, can significantly improve delta ferrite solid solution speed while obtaining tiny austenite
It is crystal grain, practical, it is easy to promote.
Embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It is a kind of to improve δ in the martensite type refractory steel ingot casting that there is indissoluble delta ferrite after high temperature long-time solid solution in tissue
The technology of higher content speed fining austenite grains simultaneously is as follows the step of methods described：
(1) there is the martensite type of indissoluble delta ferrite in being organized first after 1180~1200 DEG C of 8~10h of high temperature solid solution
Heat resisting steel ingot casting (10Cr12Ni3Mo2VN or KT5331) is cooled to room temperature, is then heated to 1000~1050 DEG C of (steel grade Ovshinskies
Below body grain coarsening temperature) complete austenitizing；
(2) and then by ingot casting internal crystal framework lacks in 1000~1050 DEG C of compressions more than 60%, increase delta ferrite
Fall into, promote the balance of alloying element to spread by increasing internal crystal framework defect, exist so as to increase after long-time solid solution in tissue
Indissoluble delta ferrite solid solution speed, meanwhile, pass through lower temperature austenitizing and large deformation and obtain tiny austenite crystal
Grain.
Embodiment 1
The present invention improves indissoluble delta ferrite present in tissue after martensite type refractory steel ingot casting high temperature long-time solid solution
Fining austenite grains are comprised the following steps that simultaneously for solid solution speed：
(1) it is by chemical composition：(C：0.10%, Si：0.22%, Mn：0.78%, Cr：12.0%, Ni：2.50%, Mo：
1.65%, V：0.32%, N：0.033%), the 10Cr12Ni3Mo2VN ingot castings after 1180 DEG C of solid solution 8h are cooled to room temperature, obtain group
Knit the middle martensite type refractory steel ingot casting that there is indissoluble delta ferrite；
(2) ingot casting for obtaining step (1) is heated to 1000 DEG C, and samming 1h completes austenitizing；
(3) and then by ingot casting in 1000 DEG C of compressions 60%, increase internal crystal framework defect in delta ferrite, pass through increase
Internal crystal framework defect promotes the balance diffusion of alloying element, so as to increase the solid solution speed of these indissoluble delta ferrites, passes through simultaneously
Lower temperature austenitizing and large deformation obtain tiny austenite crystal.
Embodiment 2
The present invention improves indissoluble delta ferrite present in tissue after martensite type refractory steel ingot casting high temperature long-time solid solution
Fining austenite grains are comprised the following steps that simultaneously for solid solution speed：
(1) it is by chemical composition：(C：0.10%, Si：0.22%, Mn：0.78%, Cr：12.0%, Ni：2.50%, Mo：
1.65%, V：0.32%, N：0.033%), the 10Cr12Ni3Mo2VN ingot castings after 1200 DEG C of solid solution 8h, are cooled to room temperature, obtain group
Knit the middle martensite type refractory steel ingot casting that there is indissoluble delta ferrite；
(2) ingot casting for obtaining step (1) is heated to 1000 DEG C, and samming 2h completes austenitizing；
(3) and then by ingot casting in 1000 DEG C of compressions 80%, increase internal crystal framework defect in delta ferrite, pass through increase
Internal crystal framework defect promotes the balance diffusion of alloying element, so as to increase the solid solution speed of these indissoluble delta ferrites, passes through simultaneously
Lower temperature austenitizing and large deformation obtain tiny austenite crystal.
Embodiment 3
The present invention improves indissoluble delta ferrite present in tissue after martensite type refractory steel ingot casting high temperature long-time solid solution
Fining austenite grains are comprised the following steps that simultaneously for solid solution speed：
(1) it is by chemical composition：(C：0.10%, Si：0.22%, Mn：0.78%, Cr：12.0%, Ni：2.50%, Mo：
1.65%, V：0.32%, N：0.033%), the 10Cr12Ni3Mo2VN ingot castings after 1180 DEG C of solid solution 8h, are cooled to room temperature, obtain group
Knit the middle martensite type refractory steel ingot casting that there is indissoluble delta ferrite；
(2) ingot casting for obtaining step (1) is heated to 1050 DEG C, and samming 2h completes austenitizing；
(3) and then by ingot casting in 1050 DEG C of compressions 60%, increase internal crystal framework defect in delta ferrite, pass through increase
Internal crystal framework defect promotes the balance diffusion of alloying element, so as to increase the solid solution speed of these indissoluble delta ferrites, passes through simultaneously
Lower temperature austenitizing and large deformation obtain tiny austenite crystal.
Embodiment 4
The present invention improves indissoluble delta ferrite present in tissue after martensite type refractory steel ingot casting high temperature long-time solid solution
Fining austenite grains are comprised the following steps that simultaneously for solid solution speed：
(1) it is by chemical composition：(C：0.11%, Si：0.20%, Mn：0.52%, Cr：10.80%, Ni：0.61%, W：
2.63%, Co：2.72%, Nb：0.12%, Mo：0.31%, V：0.22%, N：0.028%, B：0.025%), 1180 DEG C of solid solutions
KT5331 ingot castings after 8h, are cooled to room temperature, obtain the martensite type refractory steel ingot casting that there is indissoluble delta ferrite in tissue；
(2) ingot casting for obtaining step (1) is heated to 1000 DEG C, and samming 1h completes austenitizing；
(3) and then by ingot casting in 1000 DEG C of compressions 60%, increase internal crystal framework defect in delta ferrite, pass through increase
Internal crystal framework defect promotes the balance diffusion of alloying element, so as to increase the solid solution speed of these indissoluble delta ferrites, passes through simultaneously
Lower temperature austenitizing and large deformation obtain tiny austenite crystal.
Embodiment 5
The present invention improves indissoluble delta ferrite present in tissue after martensite type refractory steel ingot casting high temperature long-time solid solution
Fining austenite grains are comprised the following steps that simultaneously for solid solution speed：
(1) it is by chemical composition：(C：0.11%, Si：0.20%, Mn：0.52%, Cr：10.80%, Ni：0.61%, W：
2.63%, Co：2.72%, Nb：0.12%, Mo：0.31%, V：0.22%, N：0.028%, B：0.025%), 1180 DEG C of solid solutions
KT5331 ingot castings after 10h, are cooled to room temperature, obtain the martensite type refractory steel ingot casting that there is indissoluble delta ferrite in tissue；
(2) ingot casting for obtaining step (1) is heated to 1000 DEG C, and samming 2h completes austenitizing；
(3) and then by ingot casting in 1000 DEG C of compressions 80%, increase internal crystal framework defect in delta ferrite, pass through increase
Internal crystal framework defect promotes the balance diffusion of alloying element, so as to increase the solid solution speed of these indissoluble delta ferrites, passes through simultaneously
Lower temperature austenitizing and large deformation obtain tiny austenite crystal.
Embodiment 6
The present invention improves indissoluble delta ferrite present in tissue after martensite type refractory steel ingot casting high temperature long-time solid solution
Fining austenite grains are comprised the following steps that simultaneously for solid solution speed：
(1) it is by chemical composition：(C：0.11%, Si：0.20%, Mn：0.52%, Cr：10.80%, Ni：0.61%, W：
2.63%, Co：2.72%, Nb：0.12%, Mo：0.31%, V：0.22%, N：0.028%, B：0.025%), 1180 DEG C of solid solutions
KT5331 ingot castings after 8h, are cooled to room temperature, obtain the martensite type refractory steel ingot casting that there is indissoluble delta ferrite in tissue；
(2) ingot casting for obtaining step (1) is heated to 1050 DEG C, and samming 2h completes austenitizing；
(3) and then by ingot casting in 1050 DEG C of compressions 60%, increase internal crystal framework defect in delta ferrite, pass through increase
Internal crystal framework defect promotes the balance diffusion of alloying element, so as to increase the solid solution speed of these indissoluble delta ferrites, passes through simultaneously
Lower temperature austenitizing and large deformation obtain tiny austenite crystal.
The present invention is promoted using the interval interior lower temperature deformation substantial increase delta ferrite internal crystal framework defect of austenitic temperature
Enter the balance diffusion of alloying element, so as to improve after martensite type refractory steel ingot casting high temperature long-time solid solution present in tissue
Indissoluble delta ferrite solid solution speed, while obtaining tiny austenite crystal by lower temperature austenitizing and large deformation.
Embodiment 7
Detection and analysis；
Analysis detection is carried out to the sample of embodiment 1, it is as a result as follows：
After 1180 DEG C of solid solution 8h organize in still suffer from about 2.5% delta ferrite, want further to drop delta ferrite level
To less than 1%, it is necessary to continue solid solution about 5h during without being deformed described in embodiment 1, and pass through 1000 DEG C of pressures described in embodiment 1
After compression deformation 60%, it is only necessary to solid solution 5min, you can delta ferrite is down into less than 1%, solution time reduces by about 98%, solid solution speed
Rate is obviously improved.
In addition, after 1180 DEG C of solid solution 8h ingot casting routine forging deformation after the average austenite grain size through being thermally treated resulting in
About 80 μm, and through being cooled to room temperature described in embodiment 1, be again heated to 1000 DEG C and complete austenitizing and compression 60%
Afterwards, the average austenite grain size obtained after being heat-treated through same process is about 60 μm, and austenite crystal is refined.
The preferred embodiment of the application is the foregoing is only, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (10)
1. a kind of improve δ iron in the martensite type refractory steel ingot casting that there is indissoluble delta ferrite after high temperature long-time solid solution in tissue
Ferritic solid solution speed is while the method for fining austenite grains, it is characterised in that：
By 10Cr12Ni3Mo2VN the or KT5331 ingot castings after 8~10h of solid solution at 1180~1200 DEG C, room temperature is cooled to；
Make martensite type refractory steel ingot casting austenitizing in austenitic temperature interval；
By the ingot casting compression more than 60% of austenitizing in said temperature is interval；
The austenitic temperature interval is 1000~1050 DEG C, i.e.,：Below steel grade AUSTENITE GRAIN COARSENING temperature.
2. the method as described in claim 1, it is characterised in that the 10Cr12Ni3Mo2VN ingot castings by following parts by weight change
Learn element composition：C：0.10%, Si：0.22%, Mn：0.78%, Cr：12.0%, Ni：2.50%, Mo：1.65%, V：
0.32%, N：0.033%.
3. the method as described in claim 1, it is characterised in that the KT5331 ingot castings by following parts by weight chemical element group
Into：C：0.11%, Si：0.20%, Mn：0.52%, Cr：10.80%, Ni：0.61%, W：2.63%, Co：2.72%, Nb：
0.12%, Mo：0.31%, V：0.22%, N：0.028%, B：0.025%.
4. the method as described in claim 1, it is characterised in that the compression is 60%~80%.
5. the method as described in claim 1, it is characterised in that the compression is 60%.
6. the method as described in claim 1, it is characterised in that equal temperature time is 1~2h in austenitic temperature is interval.
7. the method as described in claim 1, it is characterised in that the austenitizing temperature is 1000~1050 DEG C, i.e.,：Steel grade
Below AUSTENITE GRAIN COARSENING temperature.
8. the method as described in claim 1, it is characterised in that the time of long-time solid solution is 8 at described 1180~1200 DEG C
~10h.
9. 1000~1050 DEG C of austenitizing temperature (below steel grade AUSTENITE GRAIN COARSENING temperature) is improving high temperature for a long time admittedly
There is delta ferrite solid solution speed in 10Cr12Ni3Mo2VN the or KT5331 ingot castings of indissoluble delta ferrite in being organized after molten simultaneously thin
Change the application in austenite crystal.
10. there is hardly possible in being organized after improving high temperature long-time solid solution in the interval ingot casting compression more than 60% of austenitic temperature
Delta ferrite solid solution speed in 10Cr12Ni3Mo2VN the or KT5331 ingot castings of molten delta ferrite is while in fining austenite grains
Using.
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| CN108893588A (en) * | 2018-07-26 | 2018-11-27 | 青岛大学 | A kind of method of delta ferrite solid solution rate in raising steel |
| CN110699535A (en) * | 2019-10-30 | 2020-01-17 | 成都先进金属材料产业技术研究院有限公司 | Heat treatment method for 10Cr11Co3W3NiMoVNbNB blade steel bar |
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| CN110699535A (en) * | 2019-10-30 | 2020-01-17 | 成都先进金属材料产业技术研究院有限公司 | Heat treatment method for 10Cr11Co3W3NiMoVNbNB blade steel bar |
| CN113846263A (en) * | 2021-08-20 | 2021-12-28 | 河北工程大学 | High-toughness heat-resistant steel without delta ferrite and preparation method thereof |
| CN113846263B (en) * | 2021-08-20 | 2022-09-02 | 河北工程大学 | High-toughness heat-resistant steel without delta ferrite and preparation method thereof |
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