CN108265169A - A kind of high strength steel treatment process - Google Patents
A kind of high strength steel treatment process Download PDFInfo
- Publication number
- CN108265169A CN108265169A CN201810048800.9A CN201810048800A CN108265169A CN 108265169 A CN108265169 A CN 108265169A CN 201810048800 A CN201810048800 A CN 201810048800A CN 108265169 A CN108265169 A CN 108265169A
- Authority
- CN
- China
- Prior art keywords
- high strength
- treatment process
- strength steel
- temperature
- steel treatment
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
-
- 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
-
- 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
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
- C21D2211/008—Martensite
Abstract
The invention discloses a kind of high strength steel treatment process, by heating steel billet to 1,100 1150 DEG C, roughing pass deformation is 25 45%, finish rolling total deformation is 50~60%, finishing temperature is 830 850 DEG C, and finish to gauge plate thickness is 2 5mm, and coiling temperature is cooled to as 720 610 DEG C using the cooling rate of 50 200 DEG C/s, it is batched, later natural cooling；Then through being cold-rolled to 1 2mm, continuous annealing is carried out to the plank after cold rolling, annealing temperature is 580 680 DEG C, 20 40s of soaking time, then air-cooled.The present invention is by coiling temperature and the harmony of composition proportion, the two-phase section formed in the cooling procedure batched, realizes that alloying element to austenite diffusion is participated in, so as to complete alloying element partition process, improves intensity in insulating process.
Description
Technical field
The present invention relates to a kind of high strength steel treatment process.
Background technology
High-strength steel is prepared mainly in the following ways using Q-P techniques about steel mill：
1st, continuous annealing is carried out to cold-rolled products, realizes the carbon atom in matrix into austenite during continuous annealing
Diffusion, to increase stabilization of austenite.Make to contain retained austenite in the final tissue of product so that during deformation after unloading
Undergo phase transition induced plastic.It is not high there are final microstructure martensite ratio and the problem of cause product strength relatively low.
2nd, bell-type annealing is carried out to cold-rolled products, realizes that manganese element is spread into austenite in process of bell type annealing, increase
Add the manganese content in austenite, make to contain retained austenite in the final tissue of product so that the Ovshinsky during deformation after unloading
Body undergoes phase transition induced plastic.There are production processes to need long-time bell-type annealing, and cost is higher, consuming energy, simultaneously because
Soaking time is larger compared with germination scale, the problem of influencing final strength.
High-strength steel is prepared about laboratory research Q-P techniques mainly in the following ways：
1st, one-step method：High-temperature steel rapid cooling is to martensitic transformation temperature section, held for some time so that in matrix
Carbon diffuses to residual austenite body region, completes partition process.In the presence of due to temperature it is relatively low, need long-time heat preservation, and
The problem of formation of martensite needs higher cooldown rate, this is for reality into being a challenge for production.
2nd, two-step method：Then it is (low to certain temperature to increase temperature to martensitic transformation temperature section for high-temperature steel rapid cooling
In transformation temperature), held for some time so that the carbon in matrix diffuses to residual austenite body region, completes partition process.Though
Right soaking time is shortened, but the formation there are martensite still needs higher cooldown rate and heats up to martensite
The problem of keeping the temperature again afterwards, this is for reality into being also a challenge for production.
3rd, two-phase section matches point-score：Sample applies deformation and held for some time, deformation in process, in two-phase section
The defects of dislocation formed in the process, promotes alloying element partition, and sample is made to complete partition in two-phase section.There are two-phase section heat preservations
It is difficult to realize during practical Rolling production, the problem of poor feasibility.
Invention content
In order to solve the above-mentioned technical problem, the object of the present invention is to provide a kind of high strength steel treatment process, solve Q-P works
Skill is difficult to direct applied problem during Rolling production.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
A kind of high strength steel treatment process, includes the following steps：
By heating steel billet to 1100-1150 DEG C, roughing pass deformation is 25-45%, finish rolling total deformation for 50~
60%, finishing temperature be 830-850 DEG C, finish to gauge plate thickness be 2-5mm, using the cooling rate of 50-200 DEG C/s be cooled to coiling temperature as
It 720-610 DEG C, is batched, later natural cooling；Then through being cold-rolled to 1-2mm, continuous annealing is carried out to the plank after cold rolling,
Annealing temperature is 580-680 DEG C, soaking time 20-40s, then air-cooled；
Wherein described steel billet includes the chemical composition of following percentage：C 0.18-0.22%, Si 1.3-1.8%, Mn
1.3-3.8%, Cu 0.4-0.55%, Ni 0.32-0.4%, P≤0.05%, S≤0.03%, surplus is for Fe and unavoidably
Impurity.
Further, by firm heating steel billet to 1080 DEG C.
Further, heating speed in annealing process：10-100℃/s.
Further, air-cooled preincubation 30s.
Further, finishing temperature is 840 DEG C.
Further, coiling temperature is 660 DEG C.
Further, the steel billet includes the chemical composition of following percentage：C 0.2%, Si 1.5%, Mn 2.5%,
Cu 0.47%, Ni 0.36%, P≤0.05%, S≤0.03%, surplus are Fe and inevitable impurity.
Compared with prior art, advantageous effects of the invention：
Matrix can be made martensite occur, make strength and ductility product higher；It can avoid using bell-type annealing technique, shorten production stream
Journey reduces cost, simultaneously because without keeping the temperature for a long time, therefore crystal grain is comparatively fine, intensity higher.
Coiling temperature and the rational harmony of steel billet composition proportion, ensure the two-phase formed in the cooling procedure batched
Area realizes that alloying element to austenite diffusion is participated in, so as to complete alloying element partition process, improves strong in insulating process
Degree.
Description of the drawings
Fig. 1 is 660 DEG C of Mn Elemental redistribution electron probe figures batched after heat preservation
Fig. 2 is to match division technique (580 DEG C are batched) stress strain curve comparison diagram with division technique (660 DEG C are batched) and nothing.
Specific embodiment
A kind of high strength steel treatment process, includes the following steps：
By heating steel billet to 108 DEG C, roughing pass deformation is 25-45%, and finish rolling total deformation is 50~60%, finish to gauge
Temperature is 840 DEG C, and finish to gauge plate thickness is 2-5mm, and coiling temperature is cooled to as 720-610 DEG C (660 using the cooling rate of 50-200 DEG C/s
DEG C), it is batched, later natural cooling；Then through being cold-rolled to 1-2mm, continuous annealing, annealing temperature are carried out to the plank after cold rolling
It spends for 580-680 DEG C of (heating speed：10-100 DEG C/s), soaking time 30s is then air-cooled；
Wherein described steel billet includes the chemical composition of following percentage：C 0.18-0.22%, Si 1.3-1.8%, Mn
1.3-3.8%, Cu 0.4-0.55%, Ni 0.32-0.4%, P≤0.05%, S≤0.03%, surplus is for Fe and unavoidably
Impurity.
It is preferred that steel billet includes the chemical composition of following percentage：C 0.2%, Si 1.5%, Mn 2.5%, Cu 0.47%,
Ni 0.36%, P≤0.05%, S≤0.03%, surplus are Fe and inevitable impurity.
Alloying element is rationally matched during Slow cooling of the present invention by using coiling process and after batching
The method divided so as to complete alloying element partition process, improves intensity.Coiling temperature (660 DEG C) and steel billet composition proportion are reasonable
Harmony, ensure the two-phase section formed in the cooling procedure batched, during Slow cooling realize alloying element (Mn)
It is spread to retained austenite, so as to complete alloying element partition process, improves intensity.
As illustrated in fig. 1 and 2, Mn elements are spread from ferrite to retained austenite during the Slow cooling after batching,
It increases the stability of retained austenite, completes Mn elemental partition processes, the presence of retained austenite shows that 660 DEG C are batched
Making that treated with division technique, steel billet has good draftability.And general coiling technique is since remained austenite content is few,
It is difficult to generate phase change induction plasticity, therefore extensibility is relatively poor.
Embodiment described above is only that the preferred embodiment of the present invention is described, and not the scope of the present invention is carried out
It limits, under the premise of design spirit of the present invention is not departed from, those of ordinary skill in the art make technical scheme of the present invention
Various modifications and improvement, should all fall into the protection domain that claims of the present invention determines.
Claims (7)
1. a kind of high strength steel treatment process, which is characterized in that include the following steps：
By heating steel billet to 1100-1150 DEG C, roughing pass deformation is 25-45%, and finish rolling total deformation is 50~60%, eventually
It is 830-850 DEG C to roll temperature, and finish to gauge plate thickness is 2-5mm, and coiling temperature is cooled to as 720-610 using the cooling rate of 50-200 DEG C/s
DEG C, it is batched, later natural cooling；Then through being cold-rolled to 1-2mm, continuous annealing, annealing temperature are carried out to the plank after cold rolling
It is 580-680 DEG C to spend, soaking time 20-40s, then air-cooled；
Wherein described steel billet includes the chemical composition of following percentage：C 0.18-0.22%, Si 1.3-1.8%, Mn 1.3-
3.8%, Cu 0.4-0.55%, Ni 0.32-0.4%, P≤0.05%, S≤0.03%, surplus is Fe and inevitable impurity.
2. high strength steel treatment process according to claim 1, it is characterised in that：By firm heating steel billet to 1080 DEG C.
3. high strength steel treatment process according to claim 1, it is characterised in that：Heating speed in annealing process：10-
100℃/s。
4. high strength steel treatment process according to claim 1, it is characterised in that：Air-cooled preincubation 30s.
5. high strength steel treatment process according to claim 1, it is characterised in that：Finishing temperature is 840 DEG C.
6. high strength steel treatment process according to claim 1, it is characterised in that：Coiling temperature is 660 DEG C.
7. high strength steel treatment process according to claim 1, it is characterised in that：The steel billet includes following percentage
Chemical composition：C 0.2%, Si 1.5%, Mn 2.5%, Cu 0.47%, Ni 0.36%, P≤0.05%, S≤0.03% are remaining
It measures as Fe and inevitable impurity.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810048800.9A CN108265169B (en) | 2018-01-18 | 2018-01-18 | A kind of high strength steel treatment process |
| ZA201900429A ZA201900429B (en) | 2018-01-18 | 2019-01-18 | High-strength steel treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810048800.9A CN108265169B (en) | 2018-01-18 | 2018-01-18 | A kind of high strength steel treatment process |
Publications (2)
| Publication Number | Publication Date |
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| CN108265169A true CN108265169A (en) | 2018-07-10 |
| CN108265169B CN108265169B (en) | 2019-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810048800.9A Active CN108265169B (en) | 2018-01-18 | 2018-01-18 | A kind of high strength steel treatment process |
Country Status (2)
| Country | Link |
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| CN (1) | CN108265169B (en) |
| ZA (1) | ZA201900429B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101638749A (en) * | 2009-08-12 | 2010-02-03 | 钢铁研究总院 | Automobile steel with low cost and high strength ductility balance and preparation method thereof |
| CN103556048A (en) * | 2013-10-24 | 2014-02-05 | 钢铁研究总院 | Two-phase automobile steel plate with low yield-strength ratio and high strength and production method of two-phase automobile steel plate |
-
2018
- 2018-01-18 CN CN201810048800.9A patent/CN108265169B/en active Active
-
2019
- 2019-01-18 ZA ZA201900429A patent/ZA201900429B/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101638749A (en) * | 2009-08-12 | 2010-02-03 | 钢铁研究总院 | Automobile steel with low cost and high strength ductility balance and preparation method thereof |
| CN103556048A (en) * | 2013-10-24 | 2014-02-05 | 钢铁研究总院 | Two-phase automobile steel plate with low yield-strength ratio and high strength and production method of two-phase automobile steel plate |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA201900429B (en) | 2019-10-30 |
| CN108265169B (en) | 2019-06-07 |
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