CN104060067B - A kind of cold-rolled steel sheet and preparation method thereof - Google Patents
A kind of cold-rolled steel sheet and preparation method thereof Download PDFInfo
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- CN104060067B CN104060067B CN201310226100.1A CN201310226100A CN104060067B CN 104060067 B CN104060067 B CN 104060067B CN 201310226100 A CN201310226100 A CN 201310226100A CN 104060067 B CN104060067 B CN 104060067B
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Abstract
The present invention provides a kind of cold-rolled steel sheet and preparation method thereof, the method includes: slab is sequentially passed through hot rolling, batch, cold rolling, annealing and smooth, described hot-rolled temperature is 1,100 1300 DEG C, the finishing temperature of described hot rolling is 900 1000 DEG C, and the intermediate slab thickness after described hot rolling is 2.8 4.5mm；Intermediate slab after hot rolling is cooled to 700 850 DEG C, and the cooldown rate of described cooling is 55 75 DEG C/s；The described temperature batched is 730 770 DEG C；Described cold rolling reduction ratio is 70 90%；During described annealing, intermediate slab after cold rolling sequentially passes through bringing-up section, cooling section, overaging section and cooling twice section, the intermediate slab after cold rolling outlet temperature in bringing-up section, cooling section, overaging section and cooling twice section is respectively 740 890 DEG C, 220 260 DEG C, 270 300 DEG C, less than 100 DEG C, and the time of staying is respectively 20 80s, 20 50s, 240 480s, 50 100s；Described smooth smooth elongation percentage is 0.2 0.6%.Cold-rolled steel sheet prepared by the preparation method of the present invention, has excellent market prospect.
Description
Technical field
The present invention relates to a kind of cold-rolled steel sheet and preparation method thereof.
Background technology
In recent years, along with the aggravation of the domestic hot-dip galvanizing sheet steel market competition, become to better adapt to market
Changing, improve product competitiveness, building materials Continuous Hot Dip Galvanizing is transform as zinc-plated and even moves back by many enterprises
Dual purpose unit.In order to meet the Production requirement of cold-reduced sheet, the method for transformation is generally moving back at galvanizing unit
The back face aperture of stove, increases the overaging section and cooling twice section run parallel with galvanizing bath.But mesh
The technique that the improved continuous annealing unit of front use carries out annealing easily produces band defect at belt steel surface.
Summary of the invention
It is an object of the invention to provide preparation method and the system thereof of a kind of new special ultra-deep punching cold-rolling steel sheet
The standby special ultra-deep punching cold-rolling steel sheet obtained, the special ultra-deep punching cold-rolling steel sheet obtained by the method is on surface not
Produce band defect, and excellent in mechanical performance.
To achieve these goals, the present invention provides the preparation method of a kind of cold-rolled steel sheet, and the method includes:
Slab is sequentially passed through hot rolling, batch, cold rolling, annealing and smooth, wherein, the temperature of described hot rolling is
1100-1300 DEG C, the finishing temperature of described hot rolling is 900-1000 DEG C, the centre obtained after described hot rolling
Slab thickness is 2.8-4.5mm；After hot rolling and before batching, the intermediate plate that will obtain after hot rolling
Base is cooled to 700-850 DEG C, and the cooldown rate of described cooling is 55-75 DEG C/s；The described temperature batched is
730-770℃；Described cold rolling reduction ratio is 70-90%；The mode of described annealing is continuous annealing,
During described annealing, cold rolling after the intermediate slab that obtains sequentially pass through bringing-up section, cooling section,
Overaging section and cooling twice section, described cold rolling after the intermediate slab that obtains described bringing-up section, described one
Outlet temperature in secondary cooling section, described overaging section and described cooling twice section be respectively 740-890 DEG C,
220-260 DEG C, 270-300 DEG C, less than 100 DEG C, the time of staying be respectively 20-80s, 20-50s, 240-480s,
50-100s；Described smooth smooth elongation percentage is 0.2-0.6%.
The present invention also provides for cold-rolled steel sheet prepared by above-mentioned preparation method.
Using cold-rolled steel sheet prepared by the preparation method of the present invention, its finished product mechanical property reaches yield strength
ReLFor 130-140MPa；Tensile strength R of described cold-rolled steel sheetmFor 285-294MPa, elongation of having no progeny
Rate A80>=44.0%, plastic strain ratio r90>=2.5, work hardening index n90>=0.25, there is excellent city
Field prospect.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with
Detailed description below is used for explaining the present invention together, but is not intended that limitation of the present invention.?
In accompanying drawing:
Fig. 1 is the microstructure picture of the cold-rolled steel sheet of the embodiment of the present invention 1 preparation.
Detailed description of the invention
Hereinafter the detailed description of the invention of the present invention is described in detail.It should be appreciated that this place is retouched
The detailed description of the invention stated is merely to illustrate and explains the present invention, is not limited to the present invention.
The present invention provides the preparation method of a kind of cold-rolled steel sheet, and the method includes: slab is sequentially passed through heat
Roll, batch, cold rolling, annealing and smooth, wherein, the temperature of described hot rolling is 1100-1300 DEG C, institute
The finishing temperature stating hot rolling is 900-1000 DEG C, and the intermediate slab thickness obtained after described hot rolling is
2.8-4.5mm；After hot rolling and before batching, the intermediate slab obtained after hot rolling is cooled to
700-850 DEG C, the cooldown rate of described cooling is 55-75 DEG C/s；The described temperature batched is 730-770 DEG C；
Described cold rolling reduction ratio is 70-90%；The mode of described annealing is continuous annealing, in described annealing
During, cold rolling after the intermediate slab that obtains sequentially pass through bringing-up section, cooling section, overaging section and
Cooling twice section, described cold rolling after the intermediate slab that obtains described bringing-up section, a described cooling section,
Outlet temperature in described overaging section and described cooling twice section be respectively 740-890 DEG C, 220-260 DEG C,
270-300 DEG C, less than 100 DEG C, the time of staying is respectively 20-80s, 20-50s, 240-480s, 50-100s；
Described smooth smooth elongation percentage is 0.2-0.6%.
In the present invention, described slab can select according to producing needs, and the most described slab is permissible
For continuous casting billet.Under preferable case, the percentage by weight of the constituent of described slab is: C:
0.003-0.006%, Si :≤0.05%, Mn:0.10-0.30%, P :≤0.015%, S :≤0.015%,
Ti:0.02-0.07%, Nb:0.01-0.05%, N≤0.005%, Al:0.010-0.080%, surplus is
Fe and inevitable impurity.
Described continuous casting billet can use the known method of this area to be prepared, such as, can pass through blast furnace
Ironmaking, molten iron pretreatment, converter smelting, steel ladle deoxidation, alloying furnace rear refining, LF electrical heating,
Described continuous casting billet is obtained after RH application of vacuum and sheet billet continuous casting.Its condition specifically prepared is this area
Well known to.
In the case of according to the invention it is preferred to, the condition of described hot rolling includes: the temperature of described hot rolling is
1140-1200 DEG C, finishing temperature is 900-940 DEG C, and the intermediate slab thickness obtained after described hot rolling is
3-4mm。
In the case of according to the invention it is preferred to, the intermediate slab obtained after hot rolling is cooled to 760-790 DEG C,
The cooldown rate of described cooling is 55-70 DEG C/s.
In the case of according to the invention it is preferred to, after the intermediate slab cooling obtained after by hot rolling and at volume
Before taking, also include the intermediate slab obtained after cooling is carried out air cooling 10-20s, preferably 12-15s.
Described air cooling refers to coil of strip and runs on roller-way but do not carry out any additional medium and cool down, such as
Laminar flow of water etc..
In the case of according to the invention it is preferred to, described in the temperature batched be 740-765 DEG C.
In the case of according to the invention it is preferred to, described cold rolling reduction ratio is 75-85%.
In the case of according to the invention it is preferred to, described cold rolling after the intermediate slab that obtains described bringing-up section,
Outlet temperature in a described cooling section, described overaging section and described cooling twice section is respectively
840-870 DEG C, 235-250 DEG C, 275-290 DEG C, less than 87-95 DEG C, the time of staying be respectively 45-56s,
33-38s、310-350s、63-75s。
Here, the outlet temperature of described bringing-up section refer to described cold rolling after the intermediate slab that obtains through described
Bringing-up section enters temperature during a described cooling section；The outlet temperature of a described cooling section refers to described
The intermediate slab obtained after cold rolling enters the temperature of described overaging section through a described cooling section；Institute
State the outlet temperature of overaging section refer to described cold rolling after the intermediate slab that obtains through described overaging section
Enter temperature during described cooling twice section；The outlet temperature of described cooling twice section refer to described cold rolling after
The intermediate slab obtained enters temperature when next step processes through cooling twice section.
According to the present invention, the mode of heating of described bringing-up section can be with various heating sides known in the field
Method, such as, can use the heating means of electricity consumption heating radiation pipe.
According to the present invention, what the type of cooling of a described cooling section can be well known in the art is various cold
But method, such as can be with the cooling gas of flowing, as cooled down by blower fan jet.Cooling gas used can
Think commonly used in the art in the gas of jet cooling, such as, nitrogen and the mixed gas of hydrogen, Qi Zhongqing
The percent by volume of gas is 2～8%.
According to the present invention, what the type of cooling of described cooling twice section can be well known in the art is various cold
But method, the most above-mentioned jet cools down.
According to the present invention, the method for the temperature of described control overaging section can be conventional temperature control method,
As long as described overaging section makes in the range of the temperature of slab is 270-300 DEG C.The most described control
The method of the temperature of overaging section processed is that overaging section is heated by electricity consumption heating radiation pipe.
In the case of according to the invention it is preferred to, described smooth smooth elongation percentage is 0.3-0.4%.
The present invention also provides for cold-rolled steel sheet prepared by above-mentioned preparation method.
Yield strength R of the cold-rolled steel sheet that the present invention provideseLFor 130-140MPa.
Other mechanical property of the cold-rolled steel sheet that the present invention provides may include that tensile strength RmFor
285-294MPa, elongation after fracture A80>=44.0%, plastic strain ratio r90>=2.5, work hardening index
n90≥0.25。
The microscopic structure of the cold-rolled steel sheet that the present invention provides can be the ferritic structure of 100%, ferrite
Grain size can be 8 grades, and ferrite grain size can be with 17.5-19 μm.
Hereinafter will be described the present invention by embodiment.
The continuous casting billet that slab is hot-dip galvanizing sheet steel used in following example is (by blast furnace ironmaking, molten iron
At pretreatment, converter smelting, steel ladle deoxidation, alloying furnace rear refining, LF electrical heating, RH vacuum
After reason and 1350 sheet billet continuous castings, the specification obtained is the continuous casting of 200mm × 1000mm × 10000mm
Base), its constituent (by weight percentage) is: C:0.004%, Si:0.020%, Mn:0.18%,
P:0.001%, S:0.012%, Als:0.040%, Ti:0.025%, Nb:0.035%, surplus is
Fe and inevitably impurity.
In following example, the assay method of the mechanical property of cold-rolled steel sheet is: yield strength ReL, tension
Intensity Rm, elongation after fracture A80Method of testing according to GBT228-2002 metal material room temperature tensile
Test method is carried out；Plastic strain ratio r90Method of testing thin according to GBT5027-2007 metal material
The assay method of plate and strip plastic strain ratio (r value) is carried out；Work hardening index n90Method of testing
Carry out according to GBT5028-2008 sheet metal and strip elongation strain hardenability value (n value) test method.
Continuous annealing unit used in following example includes bringing-up section, cooling section, a mistake successively
Aging section and cooling twice section.Described bringing-up section is heated by coal gas directly fire and electrical heating radial canal；
A described cooling section is cooled down by jet；Described overaging section is carried out by electricity consumption heating radiation pipe
Temperature control；Described cooling twice section is cooled down by jet.
Embodiment 1
The preparation method of the cold-rolled steel sheet that the present embodiment provides for the present invention is described.
Slab is rolled at 1199 DEG C the thick intermediate slab of 4.0mm, and the finishing temperature of hot rolling is
915℃；Being cooled to 790 DEG C with the cooling rate of 55 DEG C/s subsequently, then air cooling runs 14s；Enter back into and batch
Machine batches rolling, and coiling temperature is 740 DEG C；It is then cooled to room temperature (25 DEG C) and uses chlorohydric acid pickling afterwards,
Cold continuous rolling rolls into the cold-reduced sheet of 0.8mm with the reduction ratio of 80%；Then at continuous annealing unit
Upper annealing, wherein, during annealing, cold rolling after the cold-reduced sheet that obtains sequentially pass through bringing-up section, one
Secondary cooling section, overaging section and cooling twice section, and described cold rolling after the intermediate slab that obtains add described
Outlet temperature in hot arc, a described cooling section, described overaging section and described cooling twice section is respectively
Being 856 DEG C, 235 DEG C, 275 DEG C, 87 DEG C, the time of staying is respectively 56s, 38s, 350s, 70s；So
After be cooled to room temperature (25 DEG C) after carry out smooth, smooth elongation percentage is 0.4%.Finally prepare is cold rolling
Steel plate does not has band defect on surface, and its mechanical property is yield strength ReLFor 130MPa, tension is strong
Degree RmFor 285MPa, elongation after fracture A80It is 49.0%, plastic strain ratio r90Being 2.9, processing is hard
Change index n90It is 0.28.
The microstructure picture of cold-rolled steel sheet prepared by the present embodiment is shown in Fig. 1.Its microscopic structure is 100%
Ferritic structure, ferrite grain size 8.0 grades, about ferrite grain size 18.9 μm.
Embodiment 2
The preparation method of the cold-rolled steel sheet that the present embodiment provides for the present invention is described.
Slab is rolled at 1140 DEG C the thick intermediate slab of 4.0mm, and the finishing temperature of hot rolling is
936℃；Being cooled to 760 DEG C with the cooling rate of 60 DEG C/s subsequently, then air cooling runs 12s；Enter back into and batch
Machine batches rolling, and coiling temperature is 765 DEG C；It is then cooled to room temperature (25 DEG C) and uses chlorohydric acid pickling afterwards,
Cold continuous rolling rolls into the cold-reduced sheet of 0.6mm with the reduction ratio of 85%；Then at continuous annealing unit
Upper annealing, wherein, during annealing, cold rolling after the cold-reduced sheet that obtains sequentially pass through bringing-up section, one
Secondary cooling section, overaging section and cooling twice section, and described cold rolling after the intermediate slab that obtains add described
Outlet temperature in hot arc, a described cooling section, described overaging section and described cooling twice section is respectively
Being 843 DEG C, 249 DEG C, 281 DEG C, 95 DEG C, the time of staying is respectively 50s, 35s, 330s, 63s；So
After be cooled to room temperature (25 DEG C) after carry out smooth, smooth elongation percentage is 0.3%.Finally prepare is cold rolling
Steel plate does not has band defect on surface, and its mechanical property is yield strength ReLFor 135MPa, tension is strong
Degree RmFor 290MPa, elongation after fracture A80It is 48.5%, plastic strain ratio r90Being 2.8, processing is hard
Change index n90It is 0.27.Its microscopic structure is the ferritic structure of 100%, ferrite grain size 8.0 grades,
Ferrite grain size about 18.0um.
Embodiment 3
The preparation method of the cold-rolled steel sheet that the present embodiment provides for the present invention is described.
Slab is rolled at 1160 DEG C the thick intermediate slab of 3.0mm, and the finishing temperature of hot rolling is
903℃；Being cooled to 775 DEG C with the cooling rate of 67 DEG C/s subsequently, then air cooling runs 15s；Enter back into and batch
Machine batches rolling, and coiling temperature is 757 DEG C；It is then cooled to room temperature (25 DEG C) and uses chlorohydric acid pickling afterwards,
Cold continuous rolling rolls into the cold-reduced sheet of 0.8mm with the reduction ratio of 73%；Then at continuous annealing unit
Upper annealing, wherein, during annealing, cold rolling after the cold-reduced sheet that obtains sequentially pass through bringing-up section, one
Secondary cooling section, overaging section and cooling twice section, and described cold rolling after the intermediate slab that obtains add described
Outlet temperature in hot arc, a described cooling section, described overaging section and described cooling twice section is respectively
Being 868 DEG C, 240 DEG C, 290 DEG C, 91 DEG C, the time of staying is respectively 45s, 33s, 310s, 75s；So
After be cooled to room temperature (25 DEG C) after carry out smooth, smooth elongation percentage is 0.38%.Finally prepare is cold rolling
Steel plate does not has band defect on surface, and its mechanical property is yield strength ReLFor 140MPa, tension is strong
Degree RmFor 294MPa, elongation after fracture A80It is 48.0%, plastic strain ratio r90Being 2.8, processing is hard
Change index n90It is 0.28.Its microscopic structure is the ferritic structure of 100%, ferrite grain size 8.0 grades,
Ferrite grain size about 17.5um.
According to embodiment, use cold-rolled steel sheet prepared by the preparation method of the present invention, its finished product mechanics
Performance reaches yield strength ReLFor 130-140MPa, tensile strength RmFor 285-294MPa, have no progeny and stretch
Long rate A80>=44.0%, plastic strain ratio r90>=2.5, work hardening index n90>=0.25, have excellent
Market prospect.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited to above-mentioned reality
Execute the detail in mode, in the technology concept of the present invention, can be to the technical side of the present invention
Case carries out multiple simple variant, and these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technology described in above-mentioned detailed description of the invention is special
Levy, in the case of reconcilable, can be combined by any suitable means, in order to avoid need not
The repetition wanted, various possible compound modes are illustrated by the present invention the most separately.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as its
Without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a preparation method for cold-rolled steel sheet, the method includes: slab sequentially passes through hot rolling, volume
Take, cold rolling, annealing and smooth, it is characterised in that
The temperature of described hot rolling is 1100-1300 DEG C, and the finishing temperature of described hot rolling is 900-1000 DEG C,
The intermediate slab thickness obtained after described hot rolling is 2.8-4.5mm；
After hot rolling and before batching, the intermediate slab obtained after hot rolling is cooled to 700-850 DEG C,
The cooldown rate of described cooling is 55-75 DEG C/s；
The described temperature batched is 730-770 DEG C；
Described cold rolling reduction ratio is 70-90%；
The mode of described annealing is continuous annealing, during described annealing, cold rolling after the centre that obtains
Slab sequentially passes through bringing-up section, cooling section, overaging section and cooling twice section, described cold rolling after
The intermediate slab arrived is cold at described bringing-up section, a described cooling section, described overaging section and described secondary
But the outlet temperature in section is respectively 740-890 DEG C, 220-260 DEG C, 270-300 DEG C, less than 100 DEG C,
The time of staying is respectively 20-80s, 20-50s, 240-480s, 50-100s；
Described smooth smooth elongation percentage is 0.2-0.6%；
The percentage by weight of the constituent of described slab is: C:0.003-0.006%, Si :≤0.05%,
Mn:0.10-0.30%, P :≤0.015%, S :≤0.015%, Ti:0.02-0.07%, Nb:0.01-0.05%,
N≤0.005%, Al:0.010-0.080%, surplus is Fe and inevitable impurity.
Preparation method the most according to claim 1, wherein, the temperature of described hot rolling is
1140-1200 DEG C, the finishing temperature of described hot rolling is 900-940 DEG C, the intermediate plate obtained after described hot rolling
Base thickness is 3-4mm.
Preparation method the most according to claim 1, wherein, the intermediate slab that will obtain after hot rolling
Being cooled to 760-790 DEG C, the cooldown rate of described cooling is 55-70 DEG C/s.
4. according to the preparation method described in claim 1 or 3, wherein, described method also includes:
After the intermediate slab cooling that will obtain after hot rolling and before batching, the intermediate slab that will obtain after cooling
Carry out air cooling 10-20s.
Preparation method the most according to claim 1, wherein, described cold rolling reduction ratio is 75-85%.
Preparation method the most according to claim 1, wherein, described cold rolling after the intermediate plate that obtains
Base end in described bringing-up section, a described cooling section, described overaging section and described cooling twice section
Point temperature is respectively 840-870 DEG C, 235-250 DEG C, 275-290 DEG C, less than 87-95 DEG C, the time of staying
It is respectively 45-56s, 33-38s, 310-350s, 63-75s.
Preparation method the most according to claim 1, wherein, described smooth smooth elongation percentage is
0.3-0.4%.
8. the cold-rolled steel sheet prepared according to the preparation method described in any one in claim 1-7.
Cold-rolled steel sheet the most according to claim 8, wherein, the R of described cold-rolled steel sheeteLFor
130-140MPa, tensile strength RmFor 285-294MPa, elongation after fracture A80>=44.0%, plasticity should
No-load voltage ratio r90>=2.5, work hardening index n90≥0.25。
Cold-rolled steel sheet the most according to claim 8 or claim 9, wherein, described cold-rolled steel sheet micro-
Being organized as the ferritic structure of 100%, ferrite grain size is 8 grades, and ferrite grain size is
17.5-19μm。
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101684532A (en) * | 2008-09-27 | 2010-03-31 | 鞍钢股份有限公司 | Enamel steel for cold-rolled water heater and production method |
| CN101956133A (en) * | 2010-10-29 | 2011-01-26 | 攀钢集团钢铁钒钛股份有限公司 | Low-yield strength anti-ageing continuous annealing cold-roll steel sheet and production method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69431134T2 (en) * | 1994-03-02 | 2002-12-12 | Nippon Steel Corp., Tokio/Tokyo | Device for controlling the strip tension in continuous annealing plants for steel strip |
| JP3725367B2 (en) * | 1999-05-13 | 2005-12-07 | 株式会社神戸製鋼所 | Ultra-fine ferrite structure high-strength hot-rolled steel sheet excellent in stretch flangeability and manufacturing method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101684532A (en) * | 2008-09-27 | 2010-03-31 | 鞍钢股份有限公司 | Enamel steel for cold-rolled water heater and production method |
| CN101956133A (en) * | 2010-10-29 | 2011-01-26 | 攀钢集团钢铁钒钛股份有限公司 | Low-yield strength anti-ageing continuous annealing cold-roll steel sheet and production method thereof |
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