CN106086627A - A kind of 600MPa level hot-rolled dual-phase steel and production method thereof - Google Patents
A kind of 600MPa level hot-rolled dual-phase steel and production method thereof Download PDFInfo
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- CN106086627A CN106086627A CN201610602708.3A CN201610602708A CN106086627A CN 106086627 A CN106086627 A CN 106086627A CN 201610602708 A CN201610602708 A CN 201610602708A CN 106086627 A CN106086627 A CN 106086627A
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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
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention belongs to dual phase steel technical field, disclose a kind of 600MPa level hot-rolled dual-phase steel, the chemical composition of described dual phase steel is by weight percent, C:0.05～0.07%, Si:0.1～0.3%, Mn:1.10～1.50%, Cr:0.5～0.8%, surplus is Fe.The invention provides the dual phase steel of a kind of low cost；Provide its efficient production method simultaneously.
Description
Technical field
The present invention relates to dual phase steel technical field, particularly to a kind of 600MPa level hot-rolled dual-phase steel and production method thereof.
Background technology
Dual phase steel, since the sixties in 20th century comes out, has had good intensity because of it and toughness coordinates, relatively low bending by force
Ratio (Rp0.2/Rm), higher elongation percentage and the highest work hardening rate, and without discontinuous yield phenomenon, make punching component easy
In shaping, resilience is little, and the abrasion of diel simultaneously is the least, because its low cost, performance are good, plays important in automobile minimizing
Effect.
Hot-rolled dual-phase steel is broadly divided into low temperature and batches type and middle warm rolling takes type two class.Low temperature batch type hot-rolled dual-phase steel be
Completing the transformation of main iron-clad horses tissue after finish to gauge and before batching, this kind of hot-rolled dual-phase steel alloy content is relatively fewer, cost of alloy
Economy, but hot rolling technology window control is strict；Middle warm rolling takes type hot-rolled dual-phase steel and is dependent on stable austenite element such as Cr, Mo etc.
Control coil of strip to batch without phase transformation transition zone in austenite metastable state, but this kind of hot-rolled dual-phase steel cost of alloy is high.
Accordingly, it would be desirable to one is in order to produce low cost, the dual phase steel that surface quality is good；Meanwhile, existing hot continuous rolling produces
Method, it is difficult to realize cooling technique is accurately controlled and ensures good surface quality.
Summary of the invention
The present invention provides a kind of 600MPa level hot-rolled dual-phase steel and production method thereof, solves existing two-phase in prior art
Steel cost is high, and existing hot continuous rolling process cannot realize cooling down technique and accurately controls and ensure the technology of good surface quality
Problem.
For solving above-mentioned technical problem, the invention provides a kind of 600MPa level hot-rolled dual-phase steel, the change of described dual phase steel
Study and point be by weight percent, C:0.05～0.07%, Si:0.1～0.3%, Mn:1.10～1.50%, Cr:0.5～
0.8%, surplus is Fe.
Further, the tissue of described dual phase steel includes: soft phase ferrite and hard phase martensite；
Described ferrite volume fraction is 75～90%, and described hard phase Martensite Volume Fraction is 10～25%.
Further, yield strength Rp0.2 of described dual phase steel is 300～375MPa, tensile strength Rm be 590～
650MPa。
Further, the yield tensile ratio of described dual phase steel is 0.56～0.60.
Further, the percentage of total elongation of having no progeny of institute's dual phase steel is 24～30%.
A kind of 600MPa level hot-rolled dual-phase steel production method, the chemical composition of described dual phase steel is by weight percent, C:
0.05～0.07%, Si:0.1～0.3%, Mn:1.10～1.50%, Cr:0.5～0.8%, surplus is Fe；
Comprise the following steps:
By the continuous casting billet heating that thickness is 230～250mm, controlling heating-up temperature is 1250～1300 DEG C, and heat time heating time is big
In 150min, tapping temperature is 1280～1300 DEG C；
Continuous casting billet after heating is carried out roughing and finish rolling, and controlling roughing tapping temperature is 1080～1100 DEG C, and finish rolling is stung
Entering temperature is 970～980 DEG C, and finish rolling finishing temperature is 790～830 DEG C, mill speed 5～6m/s；
Carrying out after hot rolling cooling down control, the continuous casting billet after finish rolling carries out ultra-rapid cooling, it is 100～130 that temperature drop controls
DEG C, rate of cooling is 100～140 DEG C/s, subsequently air cooling 7～12s；Again below section cooling to 250 DEG C, rate of cooling 85～
115℃/S。
Further, the tissue of described dual phase steel includes: soft phase ferrite and hard phase martensite；
Described ferrite volume fraction is 75～90%, and described hard phase Martensite Volume Fraction is 10～25%.
Further, it is 300～375MPa that yield strength Rp0.2 of described dual phase steel controls, and the control of tensile strength Rm is
590～650MPa.
Further, the yield tensile ratio of described dual phase steel controls is 0.56～0.60.
Further, the percentage of total elongation of having no progeny of institute's dual phase steel controls to be 24～30%.
The one or more technical schemes provided in the embodiment of the present application, at least have the following technical effect that or advantage:
The 600MPa level hot-rolled dual-phase steel of present invention offer and production method thereof, product specification is thin, and steel plate longitudinal direction performance is equal
Even；Without price heavy element, thus reduce cost of material；Temperature and air cooling time has once been cooled down by control, it is achieved
To its yield strength, the accurate control of tensile strength, Rp0.2300～375MPa, Rm are 590～650MPa, and yield tensile ratio is 0.56
～0.60, percentage of total elongation of having no progeny is 24～30%, and performance and surface quality are superior.
Accompanying drawing explanation
The 600MPa level hot-rolled dual-phase steel production method flow chart that Fig. 1 provides for the embodiment of the present invention.
Detailed description of the invention
The embodiment of the present application, by providing a kind of 600MPa level hot-rolled dual-phase steel and production method thereof, solves prior art
In existing dual phase steel cost high, existing hot continuous rolling process cannot realize cooling down technique and accurately controls and ensure good surface
The technical problem of quality；Reach reduction dual phase steel production cost, promoted.
In order to be better understood from technique scheme, below in conjunction with Figure of description and specific embodiment to upper
State technical scheme to be described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment is to the application skill
The detailed description of art scheme rather than the restriction to technical scheme, in the case of not conflicting, the embodiment of the present application
And the technical characteristic in embodiment can be mutually combined.
See Fig. 1, a kind of 600MPa level hot-rolled dual-phase steel that the embodiment of the present invention provides, the chemical composition of described dual phase steel
It is by weight percent, C:0.05～0.07%, Si:0.1～0.3%, Mn:1.10～1.50%, Cr:0.5～0.8%, remaining
Amount is Fe.
The tissue of described dual phase steel includes: soft phase ferrite and hard phase martensite；
Described ferrite volume fraction is 75～90%, and described hard phase Martensite Volume Fraction is 10～25%.
Yield strength Rp0.2 of described dual phase steel is 300～375MPa, and tensile strength Rm is 590～650MPa.
The yield tensile ratio of described dual phase steel is 0.56～0.60.
The percentage of total elongation of having no progeny of institute's dual phase steel is 24～30%.
The present embodiment also provides for a kind of production method producing above-mentioned dual phase steel.
A kind of 600MPa level hot-rolled dual-phase steel production method, the chemical composition of described dual phase steel is by weight percent, C:
0.05～0.07%, Si:0.1～0.3%, Mn:1.10～1.50%, Cr:0.5～0.8%, surplus is Fe；
Comprise the following steps:
By the continuous casting billet heating that thickness is 230～250mm, controlling heating-up temperature is 1250～1300 DEG C, and heat time heating time is big
In 150min, tapping temperature is 1280～1300 DEG C；
Continuous casting billet after heating is carried out roughing and finish rolling, and controlling roughing tapping temperature is 1080～1100 DEG C, and finish rolling is stung
Entering temperature is 970～980 DEG C, and finish rolling finishing temperature is 790～830 DEG C, mill speed 5～6m/s；
Carrying out after hot rolling cooling down control, the continuous casting billet after finish rolling carries out ultra-rapid cooling, it is 100～130 that temperature drop controls
DEG C, rate of cooling is 100～140 DEG C/s, subsequently air cooling 7～12s；Again below section cooling to 250 DEG C, rate of cooling 85～
115℃/S。
The tissue of described dual phase steel includes: soft phase ferrite and hard phase martensite；Described ferrite volume fraction be 75～
90%, described hard phase Martensite Volume Fraction is 10～25%.
It is 300～375MPa that yield strength Rp0.2 of described dual phase steel controls, tensile strength Rm control be 590～
650MPa。
It is 0.56～0.60 that the yield tensile ratio of described dual phase steel controls.Institute's dual phase steel have no progeny percentage of total elongation control be 24～
30%.
By concrete example, described method will be described below.
Example 1:
(1) by the continuous casting billet heating that thickness is 230mm, control heating-up temperature 1300 DEG C, soaking time 150min, go out furnace temperature
Spending 1280 DEG C, each component of continuous casting billet is by weight percentage: C:0.06%, Si:0.1%, Mn:1.30%, Cr:0.54%, remaining
Amount is Fe and inevitable impurity.
(2) rolling continuous casting billet, control tapping temperature 1100 DEG C, finish rolling is nipped temperature 1070 DEG C, finishing temperature 800
DEG C, mill speed 5.8m/s.
(3) carrying out after hot rolling cooling down control, first through ultra-rapid cooling, temperature drop is 130 DEG C, and rate of cooling is 120 DEG C/S,
Air cooling 8s subsequently, then through section cooling to 150 DEG C, 85 DEG C/S of rate of cooling.
Finally batch, coiling temperature 110 DEG C.
The steel plate chemical composition of preparation is C:0.05%, Si:0.1%, Mn:1.10%, Cr:0.5% by weight percent,
Surplus is Fe and inevitable impurity；Being organized as soft phase ferrite and hard phase martensite, ferrite number is 70%, horse
Family name's body is 30%, and its yield strength Rp0.2 is 335MPa, and tensile strength Rm is 612MPa, and yield tensile ratio is 0.547, has no progeny and always stretches
Long rate is 26%.
Example 2:
(1) by the continuous casting billet heating that thickness is 230mm, control heating-up temperature 1300 DEG C, soaking time 150min, go out furnace temperature
Spending 1280 DEG C, each component of continuous casting billet is by weight percentage: C:0.06%, Si:0.15%, Mn:1.25%, Cr:0.54%, remaining
Amount is Fe and inevitable impurity.
(2) rolling continuous casting billet, control tapping temperature 1100 DEG C, finish rolling is nipped temperature 1070 DEG C, finishing temperature 800
DEG C, mill speed 5.8m/s.
(3) carrying out after hot rolling cooling down control, first through ultra-rapid cooling, temperature drop is 110 DEG C, and rate of cooling is 100 DEG C/S,
Air cooling 8s subsequently, then through section cooling to 150 DEG C, 85 DEG C/S of rate of cooling；
Finally batch, coiling temperature 110 DEG C.
The steel plate chemical composition of preparation is C:0.05%, Si:0.1%, Mn:1.10%, Cr:0.5% by weight percent,
Surplus is Fe and inevitable impurity；Being organized as soft phase ferrite and hard phase martensite, ferrite number is 75%, horse
Family name's body is 25%, and its yield strength Rp0.2 is 345MPa, and tensile strength Rm is 622MPa, and yield tensile ratio is 0.554, has no progeny and always stretches
Long rate is 26%；
Example 3:
(1) by the continuous casting billet heating that thickness is 230mm, control heating-up temperature 1300 DEG C, soaking time 150min, go out furnace temperature
Spending 1280 DEG C, each component of continuous casting billet is by weight percentage: C:0.06%, Si:0.15%, Mn:1.25%, Cr:0.54%, remaining
Amount is Fe and inevitable impurity.
(2) rolling continuous casting billet, control tapping temperature 1100 DEG C, finish rolling is nipped temperature 1070 DEG C, finishing temperature 800
DEG C, mill speed 5.3m/s.
(3) carrying out after hot rolling cooling down control, first through ultra-rapid cooling, temperature drop is 130 DEG C, and rate of cooling is 120 DEG C/S,
Air cooling 11s subsequently, then through section cooling to 150 DEG C, 85 DEG C/S of rate of cooling.
Finally batch, coiling temperature 110 DEG C.
The steel plate chemical composition of preparation is C:0.05%, Si:0.1%, Mn:1.10%, Cr:0.5% by weight percent,
Surplus is Fe and inevitable impurity；Being organized as soft phase ferrite and hard phase martensite, ferrite number is 81%, horse
Family name's body is 19%, and its yield strength Rp0.2 is 315MPa, and tensile strength Rm is 602MPa, and yield tensile ratio is 0.554, has no progeny and always stretches
Long rate is 26%
The one or more technical schemes provided in the embodiment of the present application, at least have the following technical effect that or advantage:
The 600MPa level hot-rolled dual-phase steel of present invention offer and production method thereof, product specification is thin, and steel plate longitudinal direction performance is equal
Even；Without price heavy element, thus reduce cost of material；Temperature and air cooling time has once been cooled down by control, it is achieved
To its yield strength, the accurate control of tensile strength, Rp0.2300～375MPa, Rm are 590～650MPa, and yield tensile ratio is 0.56
～0.60, percentage of total elongation of having no progeny is 24～30%, and performance and surface quality are superior.
It should be noted last that, above detailed description of the invention only in order to technical scheme to be described and unrestricted,
Although the present invention being described in detail with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent, without deviating from the spirit and scope of technical solution of the present invention, it all should be contained
In the middle of scope of the presently claimed invention.
Claims (10)
1. a 600MPa level hot-rolled dual-phase steel, it is characterised in that: the chemical composition of described dual phase steel is by weight percent, C:
0.05～0.07%, Si:0.1～0.3%, Mn:1.10～1.50%, Cr:0.5～0.8%, surplus is Fe.
2. 600MPa level hot-rolled dual-phase steel as claimed in claim 1, it is characterised in that the tissue of described dual phase steel includes: soft
Phase ferrite and hard phase martensite；
Described ferrite volume fraction is 75～90%, and described hard phase Martensite Volume Fraction is 10～25%.
3. 600MPa level hot-rolled dual-phase steel as claimed in claim 2, it is characterised in that: the yield strength of described dual phase steel
Rp0.2 is 300～375MPa, and tensile strength Rm is 590～650MPa.
4. 600MPa level hot-rolled dual-phase steel as claimed in claim 3, it is characterised in that: the yield tensile ratio of described dual phase steel is 0.56
～0.60.
5. 600MPa level hot-rolled dual-phase steel as claimed in claim 4, it is characterised in that: the percentage of total elongation of having no progeny of institute's dual phase steel is
24～30%.
6. a 600MPa level hot-rolled dual-phase steel production method, it is characterised in that the chemical composition of described dual phase steel presses quality hundred
Mark is, C:0.05～0.07%, Si:0.1～0.3%, Mn:1.10～1.50%, Cr:0.5～0.8%, and surplus is Fe；
Comprise the following steps:
By the continuous casting billet heating that thickness is 230～250mm, controlling heating-up temperature is 1250～1300 DEG C, and heat time heating time is more than
150min, tapping temperature is 1280～1300 DEG C；
Continuous casting billet after heating carried out roughing and finish rolling, and controlling roughing tapping temperature is 1080～1100 DEG C, and finish rolling is nipped temperature
Degree is 970～980 DEG C, and finish rolling finishing temperature is 790～830 DEG C, mill speed 5～6m/s；
Carrying out after hot rolling cooling down control, the continuous casting billet after finish rolling carries out ultra-rapid cooling, it is 100～130 DEG C that temperature drop controls, cold
But speed is 100～140 DEG C/s, subsequently air cooling 7～12s；Again below section cooling to 250 DEG C, rate of cooling 85～115
℃/s。
7. 600MPa level hot-rolled dual-phase steel production method as claimed in claim 6, it is characterised in that the tissue of described dual phase steel
Including: soft phase ferrite and hard phase martensite；
Described ferrite volume fraction is 75～90%, and described hard phase Martensite Volume Fraction is 10～25%.
8. 600MPa level hot-rolled dual-phase steel production method as claimed in claim 7, it is characterised in that: the surrender of described dual phase steel
It is 300～375MPa that intensity Rp0.2 controls, and it is 590～650MPa that tensile strength Rm controls.
9. 600MPa level hot-rolled dual-phase steel production method as claimed in claim 8, it is characterised in that: bending of described dual phase steel is strong
It is 0.56～0.60 than control.
10. 600MPa level hot-rolled dual-phase steel production method as claimed in claim 9, it is characterised in that: having no progeny of institute's dual phase steel
It is 24～30% that percentage of total elongation controls.
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Cited By (6)
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| CN107746931A (en) * | 2017-10-31 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of hot-rolled dual-phase steel used for automobile wheels and its production method |
| CN107760996A (en) * | 2017-09-25 | 2018-03-06 | 武汉钢铁有限公司 | A kind of hot-rolled dual-phase steel and its processing method |
| CN107829027A (en) * | 2017-10-19 | 2018-03-23 | 武汉钢铁有限公司 | A kind of Thin Specs 780MPa levels dual phase steel and its processing method |
| CN109881104A (en) * | 2019-03-20 | 2019-06-14 | 首钢集团有限公司 | A kind of 580MPa grades of hot rolling acid-cleaning dual phase steel and preparation method thereof |
| CN115029622A (en) * | 2022-04-29 | 2022-09-09 | 武汉钢铁有限公司 | High-surface-quality hot-rolled dual-phase steel and production process thereof |
| CN115074637A (en) * | 2022-06-25 | 2022-09-20 | 上海交通大学 | Ultrahigh-strength high-toughness superfine-structure low-carbon low-alloy steel and preparation method thereof |
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| CN107746931A (en) * | 2017-10-31 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of hot-rolled dual-phase steel used for automobile wheels and its production method |
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| CN115074637A (en) * | 2022-06-25 | 2022-09-20 | 上海交通大学 | Ultrahigh-strength high-toughness superfine-structure low-carbon low-alloy steel and preparation method thereof |
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Inventor after: Yang Hailin Inventor after: Liu Liang Inventor after: Zhang Yang Inventor after: Bai Chunlei Inventor after: Zhou Yizhong Inventor after: Ma Hanghao Inventor after: Gui Zhou Inventor after: Dai Peng Inventor after: Li Liang Inventor after: Yang Kang Inventor before: Zhang Yang |
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Application publication date: 20161109 |