CN108690907A - A kind of heat treatment process of two phase stainless steel - Google Patents
A kind of heat treatment process of two phase stainless steel Download PDFInfo
- Publication number
- CN108690907A CN108690907A CN201710222535.7A CN201710222535A CN108690907A CN 108690907 A CN108690907 A CN 108690907A CN 201710222535 A CN201710222535 A CN 201710222535A CN 108690907 A CN108690907 A CN 108690907A
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- stainless steel
- phase stainless
- phase
- cooled
- heat treatment
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
-
- 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)
Abstract
The present invention provides a kind of two phase stainless steel heat-treatment technology methods, and two phase stainless steel is heated to coexistence region temperature first, keep the temperature 10~60min;Then fast cooling technology is used, two phase stainless steel is cooled fast to 400 DEG C or less;400 DEG C of two phase stainless steels below will be finally cooled to be cooled to room temperature with lower cooling rate.Problem of Cracking caused by thermal stress during large scale two phase stainless steel parts are quickly cooled down can be solved using the heat treatment process, the precipitation for avoiding harmful phase in two phase stainless steel simultaneously has important application value for the production practices of large scale two phase stainless steel parts.
Description
Technical field
The invention belongs to technical field of heat treatment, specifically provide a kind of heat treatment of Austenite and ferriteaustenite double phases of stainless steel
Process.
Background technology
Ferritic phase makes an appointment with austenite and respectively accounts for half in the microscopic structure of two phase stainless steel, special according to the tissue of two-phase
Point can make two phase stainless steel have ferrite concurrently by rationally controlling its chemical composition, heat processing technique and heat treatment process
The advantages of stainless steel and austenitic stainless steel.Exactly these superior performances, make two phase stainless steel be widely used in nuclear power, oil
The key areas such as chemical industry and ocean engineering.
The heat treatment process of two phase stainless steel has a great impact to microscopic structure, and microscopic structure is then to two phase stainless steel
Mechanical property and corrosion resisting property have conclusive effect, and therefore, it is to ensure two phase stainless steel to formulate rational heat treatment process
Key with Good All-around Property.The Final Heat Treatment Process of two phase stainless steel generally include coexistence region solution treatment and quickly
Cooling two parts, it is in order to avoid being harmful to the precipitation of the second phase (such as σ phases) to be quickly cooled down, and the precipitation of this harmful phase can cause double
The deterioration of mutually stainless steel toughness and corrosion resisting property.And when cooling rate is too fast (particularly with large scale parts), two phase stainless steel
It is easy to crack under the action of thermal stress and leads to scrapping for parts.Therefore, in actual production practice, for two-phase stainless
The control of steel heat treatment process and improvement are significant.
Invention content
To solve the above problem present in the prior art and actual production, the present invention provides a kind of dual-phase stainless steel hots
Processing method.Heat treatment process using the present invention can solve large scale two phase stainless steel parts and be quickly cooled down process
Problem of Cracking caused by middle thermal stress, while avoiding the precipitation of harmful phase in two phase stainless steel.
The heat-treatment technology method of the two phase stainless steel of the present invention, follows the steps below:
Step 1:Two phase stainless steel is heated to coexistence region temperature, 10~60min is kept the temperature, makes austenite in ferrite matrix
In be uniformly precipitated;
Step 2:Using fast cooling technology, it is more than or equal to the cooling rate of 50 DEG C (preferably 50~70 DEG C/s), by two-phase
Stainless steel is cooled fast to 400 DEG C or less;
Step 3:400 DEG C of two phase stainless steels below will be cooled to be cooled to room temperature with the cooling rate of 0.5~5 DEG C/s.
Wherein, coexistence region temperature described in step 1 is 950~1150 DEG C.The Austenite and ferriteaustenite double phases of stainless steel is
SAF2205 two phase stainless steels, SAF2507 two phase stainless steels, UR47N two phase stainless steels and VS25 two phase stainless steels.
Compared with prior art, the features of the present invention and effective effect are:
(1), with the cooling rate of 50~70 DEG C/s, two phase stainless steel is cooled fast to 400 DEG C hereinafter, quickly passing through
The Precipitation Temperature section of harmful phase can effectively avoid the precipitation of harmful phase in two phase stainless steel (such as σ phases), ensure two-phase not
The excellent comprehensive performance of rust steel.
(2), 400 DEG C of two phase stainless steels below will be cooled to be cooled to room temperature with the cooling rate of 0.5~5 DEG C/s, 400
DEG C or less reduce cooling rate, ensure that two phase stainless steel in cooling procedure have lower thermal stress, it is possible to prevente effectively from
Two phase stainless steel parts be quickly cooled down during cracking phenomena.
Description of the drawings
Fig. 1 is the microscopic structure of the SAF2205 two phase stainless steels after the embodiment of the present invention 1 is heat-treated.
Fig. 2 is the microscopic structure of the SAF2205 two phase stainless steels after the embodiment of the present invention 3 is heat-treated.
Fig. 3 is the microscopic structure of the SAF2205 two phase stainless steels after the embodiment of the present invention 4 is heat-treated.
Specific implementation mode
The material selected in the embodiment of the present invention is several typical two phase stainless steels, the trade mark and corresponding name chemistry
Ingredient is as shown in table 1.
The nominal composition (wt.%) of 1 several typical two-phase stainless steels of table
| C | Cr | Ni | Mo | N | Fe | |
| SAF2205 | 0.03 | 22.0 | 5.0 | 2.8 | 0.15 | Bal. |
| SAF2507 | 0.03 | 25.0 | 7.0 | 3.8 | 0.28 | Bal. |
| UR47N | 0.03 | 25.0 | 6.5 | 3.0 | 0.22 | Bal. |
| VS25 | 0.03 | 25.0 | 6.5 | 3.0 | 0.18 | Bal. |
According to the melting in vacuum induction melting furnace after nominal composition progress dispensing shown in table 1 and batch mixing, it is cast into
Ingot casting carries out the processing that strips off the skin, and the final size of ingot casting is:Diameter 160mm, length 550mm.The ingot casting used in following embodiment
It is to be heat-treated on this Process base after the processing of this process.
Embodiment 1
A kind of heat-treatment technology method of SAF2205 two phase stainless steels, follows the steps below:
Step 1:Two phase stainless steel ingot casting is heated to 1120 DEG C, keeps the temperature 40min, keeps austenite equal in ferrite matrix
Even precipitation;
Step 2:Two phase stainless steel ingot casting is cooled fast to the cooling rate of 70 DEG C/s using fast cooling technology
Room temperature.
SAF2205 two phase stainless steel ingot castings in the present embodiment, cracking phenomenon after heat treatment, this is because cooling rate
Caused by thermal stress that is very fast and generating is larger.Finally obtained two-phase stainless steel microscopic structure is as shown in Figure 1, austenite content
46.5%, austenite and ferritic boundary do not find the precipitation of the second phase.
Embodiment 2
A kind of heat-treatment technology method of SAF2205 two phase stainless steels, follows the steps below:
Step 1:Two phase stainless steel ingot casting is heated to 1120 DEG C, keeps the temperature 40min, keeps austenite equal in ferrite matrix
Even precipitation;
Step 2:Two phase stainless steel ingot casting is cooled fast to the cooling rate of 50 DEG C/s using fast cooling technology
Room temperature.
SAF2205 two phase stainless steel ingot castings in the present embodiment, still cracking phenomenon, microscopic structure are seen after heat treatment
It examines and shows the precipitation of austenite and ferritic boundary without the second phase.
Embodiment 3
A kind of heat-treatment technology method of SAF2205 two phase stainless steels, follows the steps below:
Step 1:Two phase stainless steel ingot casting is heated to 1120 DEG C, keeps the temperature 40min, keeps austenite equal in ferrite matrix
Even precipitation;
Step 2:With the cooling rate of 0.5 DEG C/s, two phase stainless steel ingot casting is cooled to room temperature.
SAF2205 two phase stainless steel ingot castings in the present embodiment, not cracking phenomenon, illustrates to reduce cold after heat treatment
But rate can reduce thermal stress and then avoid cracking.Finally obtained two-phase stainless steel microscopic structure is as shown in Fig. 2, austenite
Acicular second phase is precipitated in austenite and ferritic boundary, this is because cooling rate is slower, in the second phase in content 43.7%
The Precipitation Temperature section residence time it is longer caused by, the precipitation of this second phase can deteriorate significantly the mechanical property of material and anti-corrosion
Performance.
Embodiment 4
A kind of heat-treatment technology method of SAF2205 two phase stainless steels, follows the steps below:
Step 1:Two phase stainless steel ingot casting is heated to coexistence region temperature, 40min is kept the temperature, makes austenite in ferrite matrix
In be uniformly precipitated;
Step 2:Two phase stainless steel ingot casting is cooled fast to the cooling rate of 60 DEG C/s using fast cooling technology
400 DEG C or less;
Step 3:400 DEG C of two phase stainless steel ingot castings below will be cooled to be cooled to room temperature with the cooling rate of 0.5 DEG C/s.
SAF2205 two phase stainless steel ingot castings in the present embodiment, not cracking phenomenon after heat treatment, this is because cold
But during, maximum thermal stress appears in the cooling later stage, reduces the cooling rate in cooling later stage and can effectively reduce thermal stress
And then it avoids cracking.Finally obtained two-phase stainless steel microscopic structure is as shown in figure 3, austenite content 47.2%, in austenite
Harmful second phase is not precipitated with ferritic boundary, this is because quickly having passed through Second Phase Precipitation temperature in cooling procedure
Section is spent, and then avoids the forming core of the second phase and grows up.
Embodiment 5
A kind of heat-treatment technology method of SAF2205 two phase stainless steels, follows the steps below:
Step 1:Two phase stainless steel ingot casting is heated to coexistence region temperature, 40min is kept the temperature, makes austenite in ferrite matrix
In be uniformly precipitated;
Step 2:Two phase stainless steel ingot casting is cooled fast to the cooling rate of 70 DEG C/s using fast cooling technology
400 DEG C or less;
Step 3:400 DEG C of two phase stainless steel ingot castings below will be cooled to be cooled to room temperature with the cooling rate of 5 DEG C/s.
SAF2205 two phase stainless steel ingot castings in the present embodiment, not cracking phenomenon after heat treatment, in austenite and
Harmful second phase is not precipitated for ferritic boundary.
Embodiment 6
A kind of heat-treatment technology method of SAF2507 two phase stainless steels, follows the steps below:
Step 1:Two phase stainless steel ingot casting is heated to coexistence region temperature, 20min is kept the temperature, makes austenite in ferrite matrix
In be uniformly precipitated;
Step 2:Two phase stainless steel ingot casting is cooled fast to the cooling rate of 50 DEG C/s using fast cooling technology
400 DEG C or less;
Step 3:400 DEG C of two phase stainless steel ingot castings below will be cooled to be cooled to room temperature with the cooling rate of 2 DEG C/s.
SAF2507 two phase stainless steel ingot castings in the present embodiment, not cracking phenomenon after heat treatment, in austenite and
Harmful second phase is not precipitated for ferritic boundary.
Embodiment 7
A kind of heat-treatment technology method of UR47N two phase stainless steels, follows the steps below:
Step 1:Two phase stainless steel ingot casting is heated to coexistence region temperature, 40min is kept the temperature, makes austenite in ferrite matrix
In be uniformly precipitated;
Step 2:Two phase stainless steel ingot casting is cooled fast to the cooling rate of 70 DEG C/s using fast cooling technology
400 DEG C or less;
Step 3:400 DEG C of two phase stainless steel ingot castings below will be cooled to be cooled to room temperature with the cooling rate of 0.5 DEG C/s.
SAF2507 two phase stainless steel ingot castings in the present embodiment, not cracking phenomenon after heat treatment, in austenite and
Harmful second phase is not precipitated for ferritic boundary.
Embodiment 8
A kind of heat-treatment technology method of VS25 two phase stainless steels, follows the steps below:
Step 1:Two phase stainless steel ingot casting is heated to coexistence region temperature, 40min is kept the temperature, makes austenite in ferrite matrix
In be uniformly precipitated;
Step 2:Two phase stainless steel ingot casting is cooled fast to the cooling rate of 55 DEG C/s using fast cooling technology
400 DEG C or less;
Step 3:400 DEG C of two phase stainless steel ingot castings below will be cooled to be cooled to room temperature with the cooling rate of 5 DEG C/s.
VS25 two phase stainless steel ingot castings in the present embodiment, not cracking phenomenon after heat treatment, in austenite and iron
Harmful second phase is not precipitated for the boundary of ferritic.
Heat treatment process provided by the invention is can be seen that by the result of above example, by quickly through harmful
The method in phase Precipitation Temperature section can effectively avoid the precipitation of harmful phase in two phase stainless steel.Pass through the reduction cooling later stage
Cooling rate can effectively reduce thermal stress so that avoid thermal stress it is larger caused by cracking.Heat treatment provided by the invention
Technique has important application value for the production practices of large scale two phase stainless steel parts.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (4)
1. a kind of heat treatment process of Austenite and ferriteaustenite double phases of stainless steel, which is characterized in that follow the steps below:
Step 1:Two phase stainless steel is heated to coexistence region temperature, keeps the temperature 10~60min, keeps austenite equal in ferrite matrix
Even precipitation;
Step 2:Two phase stainless steel is cooled fast to being more than or equal to the cooling rate of 50 DEG C/s using fast cooling technology
400 DEG C or less;
Step 3:400 DEG C of two phase stainless steels below will be cooled to be cooled to room temperature with the cooling rate of 0.5~5 DEG C/s.
2. according to the heat treatment process of Austenite and ferriteaustenite double phases of stainless steel described in claim 1, it is characterised in that:Step 1
In, the coexistence region temperature is 950~1150 DEG C.
3. according to the heat treatment process of Austenite and ferriteaustenite double phases of stainless steel described in claim 1, it is characterised in that:Step 2
In, the cooling rate is 50~70 DEG C/s.
4. according to the heat treatment process of Austenite and ferriteaustenite double phases of stainless steel described in claim 1, it is characterised in that:The iron
Ferritic-austenitic duplex stainless steel be SAF2205 two phase stainless steels, SAF2507 two phase stainless steels, UR47N two phase stainless steels and
VS25 two phase stainless steels.
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| CN201710222535.7A CN108690907A (en) | 2017-04-07 | 2017-04-07 | A kind of heat treatment process of two phase stainless steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112899444A (en) * | 2021-01-20 | 2021-06-04 | 东北大学 | Heat treatment process of high-strength high-toughness ferrite-austenite duplex stainless steel |
| CN114107631A (en) * | 2021-11-15 | 2022-03-01 | 成都先进金属材料产业技术研究院股份有限公司 | Ferrite-austenite duplex stainless steel heat treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112899444A (en) * | 2021-01-20 | 2021-06-04 | 东北大学 | Heat treatment process of high-strength high-toughness ferrite-austenite duplex stainless steel |
| CN112899444B (en) * | 2021-01-20 | 2022-03-25 | 东北大学 | Heat treatment process of high-strength high-toughness ferrite-austenite duplex stainless steel |
| CN114107631A (en) * | 2021-11-15 | 2022-03-01 | 成都先进金属材料产业技术研究院股份有限公司 | Ferrite-austenite duplex stainless steel heat treatment method |
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Application publication date: 20181023 |