CN104060067A - Cold-rolled steel plate and preparation method thereof - Google Patents

Cold-rolled steel plate and preparation method thereof Download PDF

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Publication number
CN104060067A
CN104060067A CN201310226100.1A CN201310226100A CN104060067A CN 104060067 A CN104060067 A CN 104060067A CN 201310226100 A CN201310226100 A CN 201310226100A CN 104060067 A CN104060067 A CN 104060067A
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cold
rolling
hot rolling
cooling
preparation
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CN201310226100.1A
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CN104060067B (en
Inventor
王敏莉
郑之旺
张功庭
张�林
梁英
刘勇
王平利
王海云
谢勇
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Abstract

The invention provides a cold-rolled steel plate and a preparation method thereof. The method includes the steps: a plate blank is successively subjected to hot rolling, coiling, cold rolling, annealing and temper rolling, wherein the hot rolling temperature is 1100-1300 DEG C, the final rolling temperature of the hot rolling is 900-1000 DEG C, and the thickness of an intermediate plate blank obtained after the hot rolling is 2.8-4.5 mm; the intermediate plate blank obtained after the hot rolling is cooled to 700-850 DEG C, and the cooling rate of the cooling is 55-75 DEG C/s; the coiling temperature is 730-770 DEG C; the reduction rate of the cold rolling is 70-90%; in the annealing process, an intermediate plate blank obtained after the cold rolling successively passes through a heating section, a first cooling section, an overaging section and a secondary cooling section, the final temperatures of the intermediate plate blank obtained after the cold rolling in the heating section, the first cooling section, the overaging section and the secondary cooling section are respectively 740-890 DEG C, 220-260 DEG C, 270-300 DEG C and below 100 DEG C, and the residence time is respectively 20-80 s, 20-50 s, 240-480 s and 50-100 s; and the temper rolling extension rate of the temper rolling is 0.2-0.6%. The cold-rolled steel plate prepared by the preparation method has excellent market prospects.

Description

A kind of cold-rolled steel sheet and preparation method thereof
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 domestic hot-dip galvanizing sheet steel market competition, for adaptation to market variations better, improve product competitiveness, many enterprises transform building materials zinc-plated as and connect and move back dual-purpose unit by Continuous Hot Dip Galvanizing.In order to meet the Production requirement of cold-reduced sheet, the method for transformation is generally the opening below at the annealing furnace of zinc-plated unit, increases the overaging section and the secondary cooling section that run parallel with zinc bath.But use at present improved company to move back the technique that unit anneals and easily produce band defect at belt steel surface.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of new special ultra-deep punching cold-rolling steel sheet and the special ultra-deep punching cold-rolling steel sheet preparing thereof, the special ultra-deep punching cold-rolling steel sheet obtaining by the method does not produce band defect on surface, and mechanical property excellence.
To achieve these goals, the invention provides a kind of preparation method of cold-rolled steel sheet, the method comprises: by slab successively 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, and the intermediate slab thickness obtaining after described hot rolling is 2.8-4.5mm; After hot rolling and before batching, the intermediate slab obtaining after hot rolling is cooled to 700-850 DEG C, described cooling rate of cooling is 55-75 DEG C/s; Described temperature of batching is 730-770 DEG C; Described cold rolling draft is 70-90%; The mode of described annealing is continuous annealing, in the process of described annealing, the intermediate slab obtaining after cold rolling is passed through heating zone, cooling section, overaging section and a secondary cooling section successively, the terminal temperature of the described intermediate slab obtaining after cold rolling in described heating zone, a described cooling section, described overaging section and described secondary cooling section be respectively 740-890 DEG C, 220-260 DEG C, 270-300 DEG C, below 100 DEG C, the residence time is respectively 20-80s, 20-50s, 240-480s, 50-100s; Described smooth smooth unit elongation is 0.2-0.6%.
The cold-rolled steel sheet that the present invention also provides above-mentioned preparation method to prepare.
The cold-rolled steel sheet that adopts preparation method of the present invention to prepare, its finished product mechanical property reaches yield strength R eLfor 130-140MPa; The tensile strength R of described cold-rolled steel sheet mfor 285-294MPa, elongation after fracture A 80>=44.0%, plastic strain ratio r 90>=2.5, work hardening exponent n 90>=0.25, there are good market outlook.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
Brief description of the drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the microstructure picture of the cold-rolled steel sheet prepared of the embodiment of the present invention 1.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
The invention provides a kind of preparation method of cold-rolled steel sheet, the method comprises: by slab successively 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, and the intermediate slab thickness obtaining after described hot rolling is 2.8-4.5mm; After hot rolling and before batching, the intermediate slab obtaining after hot rolling is cooled to 700-850 DEG C, described cooling rate of cooling is 55-75 DEG C/s; Described temperature of batching is 730-770 DEG C; Described cold rolling draft is 70-90%; The mode of described annealing is continuous annealing, in the process of described annealing, the intermediate slab obtaining after cold rolling is passed through heating zone, cooling section, overaging section and a secondary cooling section successively, the terminal temperature of the described intermediate slab obtaining after cold rolling in described heating zone, a described cooling section, described overaging section and described secondary cooling section be respectively 740-890 DEG C, 220-260 DEG C, 270-300 DEG C, below 100 DEG C, the residence time is respectively 20-80s, 20-50s, 240-480s, 50-100s; Described smooth smooth unit elongation is 0.2-0.6%.
In the present invention, described slab can be selected according to need of production, and for example described slab can be continuously cast bloom.Under preferable case, the weight percent of the moiety 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 continuously cast bloom can adopt the known method of this area to be prepared, for example can be by obtaining described continuously cast bloom after blast furnace ironmaking, hot metal pretreatment, converter smelting, steel ladle deoxidation, alloying furnace rear refining, LF electrically heated, RH vacuum-treat and sheet billet continuous casting.The condition of its concrete preparation is well known in the art.
According to the present invention, under preferable case, the condition of described hot rolling comprises: the temperature of described hot rolling is 1140-1200 DEG C, and finishing temperature is 900-940 DEG C, and the intermediate slab thickness obtaining after described hot rolling is 3-4mm.
According to the present invention, under preferable case, the intermediate slab obtaining after hot rolling is cooled to 760-790 DEG C, described cooling rate of cooling is 55-70 DEG C/s.
According to the present invention, under preferable case, by after cooling the intermediate slab obtaining after hot rolling and before batching, also comprise the intermediate slab obtaining after cooling is carried out to air cooling 10-20s, be preferably 12-15s.Described air cooling refer to coil of strip on roller-way, move but do not carry out any additional medium carry out cooling, such as laminar flow water etc.
According to the present invention, under preferable case, described in the temperature of batching be 740-765 DEG C.
According to the present invention, under preferable case, described cold rolling draft is 75-85%.
According to the present invention, under preferable case, the terminal temperature of the described intermediate slab obtaining after cold rolling in described heating zone, a described cooling section, described overaging section and described secondary cooling section is respectively below 840-870 DEG C, 235-250 DEG C, 275-290 DEG C, 87-95 DEG C, and the residence time is respectively 45-56s, 33-38s, 310-350s, 63-75s.
At this, the terminal temperature of described heating zone refers to temperature when the described intermediate slab obtaining after cold rolling enters a described cooling section through described heating zone; The terminal temperature of a described cooling section refers to temperature when the described intermediate slab obtaining after cold rolling enters described overaging section through a described cooling section; The terminal temperature of described overaging section refers to temperature when the described intermediate slab obtaining after cold rolling enters described secondary cooling section through described overaging section; The terminal temperature of described secondary cooling section refers to temperature when the described intermediate slab obtaining after cold rolling enters next step and processes through secondary cooling section.
According to the present invention, the type of heating of described heating zone can various heating means known in the field, for example, can adopt the heating means with electrically heated radiator tube.
According to the present invention, the type of cooling of a described cooling section can be various method of cooling known in the field, for example can be with mobile cooling gas, as jet cooling with blower fan.Cooling gas used can be usually used in jet cooling gas for this area, for example, the mixed gas of nitrogen and hydrogen, wherein the volume percent of hydrogen is 2～8%.
According to the present invention, the type of cooling of described secondary cooling section can be various method of cooling known in the field, for example above-mentioned jet cooling.
According to the present invention, the method for the temperature of described control overaging section can be conventional temperature control method, is in the scope of 270-300 DEG C as long as described overaging section makes the temperature of slab.For example the method for the temperature of described control overaging section is for heating overaging section with electrically heated radiator tube.
According to the present invention, under preferable case, described smooth smooth unit elongation is 0.3-0.4%.
The cold-rolled steel sheet that the present invention also provides above-mentioned preparation method to prepare.
The yield strength R of cold-rolled steel sheet provided by the invention eLfor 130-140MPa.
Other mechanical property of cold-rolled steel sheet provided by the invention can comprise: tensile strength R mfor 285-294MPa, elongation after fracture A 80>=44.0%, plastic strain ratio r 90>=2.5, work hardening exponent n 90>=0.25.
The microstructure of cold-rolled steel sheet provided by the invention can be 100% ferritic structure, and ferrite grain size can be 8 grades, and ferrite grain size can 17.5-19 μ m.
Below will describe the present invention by embodiment.
The slab adopting in following examples is that the continuously cast bloom of hot-dip galvanizing sheet steel is (after blast furnace ironmaking, hot metal pretreatment, converter smelting, steel ladle deoxidation, alloying furnace rear refining, LF electrically heated, RH vacuum-treat and 1350 sheet billet continuous castings, the specification obtaining is the continuously cast bloom of 200mm × 1000mm × 10000mm), its moiety (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 inevitable impurity.
In following examples, the measuring method of the mechanical property of cold-rolled steel sheet is: yield strength ReL, tensile strength Rm, elongation after fracture A 80testing method carry out according to GBT228-2002 metallic substance tensile testing at ambient temperature; Plastic strain ratio r 90testing method carry out according to the measuring method of GBT5027-2007 metal sheet and strip plastic strain ratio (r value); Work hardening exponent n 90testing method carry out according to GBT5028-2008 metal sheet and strip tension strain hardenability value (n value) test method.
The continuous annealing unit using in following examples comprises heating zone, cooling section, overaging section and a secondary cooling section successively.Described heating zone heats by the straight fire of coal gas and electrically heated radiator tube; A described cooling section by jet carry out cooling; Described overaging section is by carrying out temperature control with electrically heated radiator tube; Described secondary cooling section by jet carry out cooling.
Embodiment 1
The present embodiment is for illustrating the preparation method of cold-rolled steel sheet provided by the invention.
Slab is rolled at 1199 DEG C to the intermediate slab that 4.0mm is thick, the finishing temperature of hot rolling is 915 DEG C; Be cooled to 790 DEG C with the cooling rate of 55 DEG C/s subsequently, then air cooling operation 14s; Enter reeling machine again and batch rolling, coiling temperature is 740 DEG C; Then after being cooled to room temperature (25 DEG C), use chlorohydric acid pickling, on cold continuous rolling, roll into the cold-reduced sheet of 0.8mm with 80% draft; Then on continuous annealing unit, anneal, wherein, in the process of annealing, the cold-reduced sheet obtaining after cold rolling passes through heating zone, cooling section, overaging section and a secondary cooling section successively, and the terminal temperature of the described intermediate slab obtaining after cold rolling in described heating zone, a described cooling section, described overaging section and described secondary cooling section is respectively 856 DEG C, 235 DEG C, 275 DEG C, 87 DEG C, and the residence time is respectively 56s, 38s, 350s, 70s; Then be cooled to and carry out after room temperature (25 DEG C) smoothly, smooth unit elongation is 0.4%.The cold-rolled steel sheet finally making does not have band defect on surface, its mechanical property is yield strength R eLfor 130MPa, tensile strength R mfor 285MPa, elongation after fracture A 80be 49.0%, plastic strain ratio r 90be 2.9, work hardening exponent n 90be 0.28.
The microstructure picture of cold-rolled steel sheet prepared by the present embodiment is shown in Fig. 1.Its microstructure is 100% ferritic structure, 8.0 grades of ferrite grain sizes, ferrite grain size 18.9 μ m left and right.
Embodiment 2
The present embodiment is for illustrating the preparation method of cold-rolled steel sheet provided by the invention.
Slab is rolled at 1140 DEG C to the intermediate slab that 4.0mm is thick, the finishing temperature of hot rolling is 936 DEG C; Be cooled to 760 DEG C with the cooling rate of 60 DEG C/s subsequently, then air cooling operation 12s; Enter reeling machine again and batch rolling, coiling temperature is 765 DEG C; Then after being cooled to room temperature (25 DEG C), use chlorohydric acid pickling, on cold continuous rolling, roll into the cold-reduced sheet of 0.6mm with 85% draft; Then on continuous annealing unit, anneal, wherein, in the process of annealing, the cold-reduced sheet obtaining after cold rolling passes through heating zone, cooling section, overaging section and a secondary cooling section successively, and the terminal temperature of the described intermediate slab obtaining after cold rolling in described heating zone, a described cooling section, described overaging section and described secondary cooling section is respectively 843 DEG C, 249 DEG C, 281 DEG C, 95 DEG C, and the residence time is respectively 50s, 35s, 330s, 63s; Then be cooled to and carry out after room temperature (25 DEG C) smoothly, smooth unit elongation is 0.3%.The cold-rolled steel sheet finally making does not have band defect on surface, its mechanical property is yield strength R eLfor 135MPa, tensile strength R mfor 290MPa, elongation after fracture A 80be 48.5%, plastic strain ratio r 90be 2.8, work hardening exponent n 90be 0.27.Its microstructure is 100% ferritic structure, 8.0 grades of ferrite grain sizes, ferrite grain size 18.0um left and right.
Embodiment 3
The present embodiment is for illustrating the preparation method of cold-rolled steel sheet provided by the invention.
Slab is rolled at 1160 DEG C to the intermediate slab that 3.0mm is thick, the finishing temperature of hot rolling is 903 DEG C; Be cooled to 775 DEG C with the cooling rate of 67 DEG C/s subsequently, then air cooling operation 15s; Enter reeling machine again and batch rolling, coiling temperature is 757 DEG C; Then after being cooled to room temperature (25 DEG C), use chlorohydric acid pickling, on cold continuous rolling, roll into the cold-reduced sheet of 0.8mm with 73% draft; Then on continuous annealing unit, anneal, wherein, in the process of annealing, the cold-reduced sheet obtaining after cold rolling passes through heating zone, cooling section, overaging section and a secondary cooling section successively, and the terminal temperature of the described intermediate slab obtaining after cold rolling in described heating zone, a described cooling section, described overaging section and described secondary cooling section is respectively 868 DEG C, 240 DEG C, 290 DEG C, 91 DEG C, and the residence time is respectively 45s, 33s, 310s, 75s; Then be cooled to and carry out after room temperature (25 DEG C) smoothly, smooth unit elongation is 0.38%.The cold-rolled steel sheet finally making does not have band defect on surface, its mechanical property is yield strength R eLfor 140MPa, tensile strength R mfor 294MPa, elongation after fracture A 80be 48.0%, plastic strain ratio r 90be 2.8, work hardening exponent n 90be 0.28.Its microstructure is 100% ferritic structure, 8.0 grades of ferrite grain sizes, ferrite grain size 17.5um left and right.
Known according to embodiment, to adopt preparation method of the present invention to prepare cold-rolled steel sheet, its finished product mechanical property reaches yield strength R eLfor 130-140MPa, tensile strength R mfor 285-294MPa, elongation after fracture A 80>=44.0%, plastic strain ratio r 90>=2.5, work hardening exponent n 90>=0.25, there are good market outlook.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, also can carry out arbitrary combination between various embodiment of the present invention, as long as it is without prejudice to 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 comprises: by slab successively through hot rolling, batch, cold rolling, annealing and smooth, it is characterized 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, and the intermediate slab thickness obtaining after described hot rolling is 2.8-4.5mm;
After hot rolling and before batching, the intermediate slab obtaining after hot rolling is cooled to 700-850 DEG C, described cooling rate of cooling is 55-75 DEG C/s;
Described temperature of batching is 730-770 DEG C;
Described cold rolling draft is 70-90%;
The mode of described annealing is continuous annealing, in the process of described annealing, the intermediate slab obtaining after cold rolling is passed through heating zone, cooling section, overaging section and a secondary cooling section successively, the terminal temperature of the described intermediate slab obtaining after cold rolling in described heating zone, a described cooling section, described overaging section and described secondary cooling section be respectively 740-890 DEG C, 220-260 DEG C, 270-300 DEG C, below 100 DEG C, the residence time is respectively 20-80s, 20-50s, 240-480s, 50-100s;
Described smooth smooth unit elongation is 0.2-0.6%.
2. preparation method according to claim 1, wherein, the temperature of described hot rolling is 1140-1200 DEG C, and the finishing temperature of described hot rolling is 900-940 DEG C, and the intermediate slab thickness obtaining after described hot rolling is 3-4mm.
3. preparation method according to claim 1, wherein, is cooled to 760-790 DEG C by the intermediate slab obtaining after hot rolling, and described cooling rate of cooling is 55-70 DEG C/s.
4. according to the preparation method described in claim 1 or 3, wherein, described method also comprises: by after cooling the intermediate slab obtaining after hot rolling and before batching, the intermediate slab obtaining after cooling is carried out to air cooling 10-20s.
5. preparation method according to claim 1, wherein, described cold rolling draft is 75-85%.
6. preparation method according to claim 1, wherein, the terminal temperature of the described intermediate slab obtaining after cold rolling in described heating zone, a described cooling section, described overaging section and described secondary cooling section is respectively below 840-870 DEG C, 235-250 DEG C, 275-290 DEG C, 87-95 DEG C, and the residence time is respectively 45-56s, 33-38s, 310-350s, 63-75s.
7. preparation method according to claim 1, wherein, described smooth smooth unit elongation is 0.3-0.4%.
8. the cold-rolled steel sheet of preparing according to the preparation method described in any one in claim 1-7.
9. cold-rolled steel sheet according to claim 8, wherein, the R of described cold-rolled steel sheet eLfor 130-140MPa, tensile strength R mfor 285-294MPa, elongation after fracture A 80>=44.0%, plastic strain ratio r 90>=2.5, work hardening exponent n 90>=0.25.
10. cold-rolled steel sheet according to claim 8 or claim 9, wherein, the ferritic structure that the microstructure of described cold-rolled steel sheet is 100%, ferrite grain size is 8 grades, ferrite grain size is 17.5-19 μ m.
CN201310226100.1A 2013-06-07 2013-06-07 A kind of cold-rolled steel sheet and preparation method thereof Expired - Fee Related CN104060067B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0675207A1 (en) * 1994-03-02 1995-10-04 Nippon Steel Corporation Continuous annealing apparatus of steel strip and tension control system for the same
JP2000328186A (en) * 1999-05-13 2000-11-28 Kobe Steel Ltd High strength hot rolled steel sheet with hyperfine ferritic structure excellent in stretch-flanging property and its production
CN101684532A (en) * 2008-09-27 2010-03-31 鞍钢股份有限公司 Enamel steel for cold rolling water heater and manufacturing method thereof
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0675207A1 (en) * 1994-03-02 1995-10-04 Nippon Steel Corporation Continuous annealing apparatus of steel strip and tension control system for the same
JP2000328186A (en) * 1999-05-13 2000-11-28 Kobe Steel Ltd High strength hot rolled steel sheet with hyperfine ferritic structure excellent in stretch-flanging property and its production
CN101684532A (en) * 2008-09-27 2010-03-31 鞍钢股份有限公司 Enamel steel for cold rolling water heater and manufacturing method thereof
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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