CN104120344A - Cold-rolled steel sheet and preparing method thereof - Google Patents
Cold-rolled steel sheet and preparing method thereof Download PDFInfo
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- CN104120344A CN104120344A CN201410336680.4A CN201410336680A CN104120344A CN 104120344 A CN104120344 A CN 104120344A CN 201410336680 A CN201410336680 A CN 201410336680A CN 104120344 A CN104120344 A CN 104120344A
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Abstract
The invention discloses a cold-rolled steel sheet and a preparing method of the cold-rolled steel sheet. The method comprises the steps that hot rolling, reeling, cold rolling, annealing, finishing, straightening and withdrawal are sequentially carried out on a sheet blank, wherein after hot rolling and before reeling, a middle sheet blank obtained after hot rolling is cooled to be at the reeling temperature at the cooling speed of 15 DEG C/s to 25 DEG C/s; the reeling temperature is 730 DEG C to 755 DEG C; the cold rolling reduction rate is 65 percent to 85 percent; the annealing is in a continuous annealing mode, and in the annealing process, the middle sheet blank obtained after cold rolling passes through a heating segment, a soaking segment, a primary cooling segment, a low-temperature retaining segment, an overaging segment and a secondary cooling segment in sequence. According to the method, the cold-rolled steel sheet which has the yield strength ranging from 130 MPa to 170 Mpa and is excellent in forming performance can be provided.
Description
Technical field
The present invention relates to a kind of cold-rolled steel sheet and preparation method thereof.
Development along with automobile industry, market improves constantly the requirement of automotive sheet, in order to meet the forming requirements of market deep-drawing, particularly for example,, in order to meet the requirement of automobile, the whole impact briquetting component of motorcycle field (being plate in automobile front wall), need a kind of steel plate that there is certain yield strength and there is good impact briquetting performance.
At present, as the method for the special ultra-deep punching cold-rolling steel sheet of preparation, CN101514392A discloses the continuous annealing process of a kind of deep-draw and extra-deep drawing sheet steel.This technique comprises: steel plate through cleaning, enters continuous annealing furnace before annealing, and speed 150～350m/min adopts nitrogen hydrogen mixeding gas ejection surface of steel plate, to steel plate protect, anti-oxidation, make steel billet temperature be heated to 120～180 ℃ simultaneously; Again, to steel plate heating, make its temperature reach 750～780 ℃, and be incubated 40～70s; Then steel plate is cooled to 400～460 ℃, and is incubated 60～300s and carries out overaging processing, be cooled to subsequently normal temperature.Owing to adopting overaging annealing process, the carbide in steel is fully separated out, guaranteed household electrical appliances steel plate and auto sheet punching performance and super deep drawability.But the impact briquetting performance of the steel plate obtaining by this technique also needs further raising.
Summary of the invention
The object of the present invention is to provide a kind of yield strength within the scope of 130-170MPa, and the good cold-rolled steel sheet of forming property and preparation method thereof.
The present inventor finds by deep research: by controlling the operations such as slab moiety, hot rolling, cold rolling, annealing, particularly in hot rolling to the temperature of each processing section being controlled in the control of the control of speed of cooling, draft in cold rolling, continuous annealing process, refinement is also stablized ferrite crystalline size, thereby can obtain a kind of yield strength within the scope of 130-170MPa, and the cold-rolled steel sheet that forming property is good, has completed the present invention thus.
That is, 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, polishing and straightening, wherein,
After described hot rolling and before described batching, with the speed of cooling of 15-25 ℃/s, the intermediate slab obtaining is cooled to the temperature of batching after hot rolling;
Described temperature of batching is 730-755 ℃;
Described cold rolling draft is 65-85%;
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 successively, soaking zone, a cooling section, low temperature keeps section, overaging section and secondary cooling section, the described intermediate slab obtaining after cold rolling is in described heating zone, described soaking zone, a described cooling section, described low temperature keeps section, terminal temperature in described overaging section and described secondary cooling section is respectively 740-780 ℃, 800-850 ℃, 150-220 ℃, 200-340 ℃, 200-290 ℃, below 100 ℃, the residence time is respectively 30-80s, 30-60s, 260-440s, 60-100s, 240-300s, 120-180s,
Consisting of of described slab: C:0.001-0.005 % by weight, Si :≤0.03 % by weight, Mn:0.1-0.3 % by weight, P:0.005-0.015 % by weight, S:0.005-0.015 % by weight, Ti:0.035-0.075 % by weight, Nb:0.005-0.03 % by weight, Al:0.01-0.08 % by weight, surplus is Fe and inevitable impurity.
The present invention also provides the cold-rolled steel sheet of being prepared by aforesaid method.
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 140-170MPa, tensile strength R
mfor 260-300MPa, elongation after fracture A
80>=44%, plastic strain ratio r
90>=2.5, work hardening exponent n
90>=0.25, be a kind of steel plate that is specially adapted to automobile, the whole impact briquetting component of motorcycle field (being for example plate in automobile front wall), there are good market outlook.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
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 of the embodiment of the present invention 1 preparation.
Fig. 2 is the microstructure picture of the cold-rolled steel sheet of the embodiment of the present invention 2 preparations.
Fig. 3 is the microstructure picture of the cold-rolled steel sheet of the embodiment of the present invention 3 preparations.
Fig. 4 is the microstructure picture of the cold-rolled steel sheet of comparative example 1 preparation of the present invention.
Fig. 5 is the microstructure picture of the cold-rolled steel sheet of comparative example 2 preparations of the present invention.
Fig. 6 is the microstructure picture of the cold-rolled steel sheet of comparative example 3 preparations of the present invention.
Fig. 7 is the microstructure picture of the cold-rolled steel sheet of comparative example 4 preparations of the present invention.
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, polishing and straightening, wherein, after described hot rolling and before described batching, with the speed of cooling of 15-25 ℃/s, the intermediate slab obtaining is cooled to the temperature of batching after hot rolling, described temperature of batching is 730-755 ℃, described cold rolling draft is 65-85%, 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 successively, soaking zone, a cooling section, low temperature keeps section, overaging section and secondary cooling section, the described intermediate slab obtaining after cold rolling is in described heating zone, described soaking zone, a described cooling section, described low temperature keeps section, terminal temperature in described overaging section and described secondary cooling section is respectively 740-780 ℃, 800-850 ℃, 150-220 ℃, 200-340 ℃, 200-290 ℃, below 100 ℃, the residence time is respectively 30-80s, 30-60s, 260-440s, 60-100s, 240-300s, 120-180s, consisting of of described slab: C:0.001-0.005 % by weight, Si :≤0.03 % by weight, Mn:0.1-0.3 % by weight, P:0.005-0.015 % by weight, S:0.005-0.015 % by weight, Ti:0.035-0.075 % by weight, Nb:0.005-0.03 % by weight, Al:0.01-0.08 % by weight, surplus is Fe and inevitable impurity.
In the present invention, although just can obtain the cold-rolled steel sheet of better intensity and better forming property when the composition of slab is in above-mentioned scope, but in order to obtain the performance of the cold-rolled steel sheet that enhancing obtains, under preferable case, consisting of of described slab: C:0.002-0.004 % by weight, Si:0.01-0.03 % by weight, Mn:0.1-0.25 % by weight, P:0.005-0.013 % by weight, S:0.008-0.015 % by weight, Ti:0.05-0.065 % by weight, Nb:0.01-0.03 % by weight, Al:0.04-0.07 % by weight, surplus is Fe and inevitable impurity.The moiety of described slab is in above-mentioned scope time, can through hot rolling of the present invention, batch, after cold rolling, annealing, polishing and straightening technique, will make the better cold-rolled steel sheet of intensity and forming property.
In the present invention, consider the over-all properties of purity of steel and product, the carbon content in described slab need to be controlled in above-mentioned scope, if carbon (C) content surpasses 0.005 % by weight, and the Plasticity Decreasing of steel plate, forming property worsens; Moreover the content of silicon (Si) need to be controlled at lower scope; Manganese (Mn) can increase the intensity of described slab, and can be combined into MnS with sulphur (S), prevents the thermal crack causing because of FeS simultaneously, but Mn too high levels, the welding property that can affect steel, therefore, need to be controlled at the content of Mn in above-mentioned scope.In addition, phosphorus (P), as strengthening element, need to be added in above-mentioned scope.Consider the economy of steel making working procedure and the effect that calcium is processed, S is controlled in the scope of 0.005-0.015 % by weight.Aluminium (Al) mainly adds as deoxidant element, realize complete deoxidation, its content requirement is more than 0.01 % by weight, but too high aluminium will affect welding property and the coating adhesion and uneconomical of steel, therefore, Al content is chosen as 0.01-0.08 % by weight and is advisable.The main fixed interval (FI) of niobium (Nb) C atom, titanium (Ti) is mainly fixed interval (FI) N atom, and interstitial atom is removed, and obtains pure ferrite matrix.
Described slab can adopt the known method of preparing continuously cast bloom of this area to be prepared, for example can be by obtaining 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 as described slab of the present invention.The condition of its concrete preparation is well known in the art.
In addition, in the present invention, the thickness of described slab can be 190-205mm left and right.
According to the present invention, described hot rolling comprises roughing and finish rolling.The start rolling temperature of described roughing can be 1190-1225 ℃, is preferably 1195-1215 ℃; The finishing temperature of described roughing can be 1160-1190 ℃, is preferably 1165-1185 ℃.In addition, the thickness of the intermediate slab after described roughing can be 33-37mm, is preferably 34-36.5mm.
In addition, the start rolling temperature of described finish rolling can be 1135-1165 ℃, is preferably 1140-1165 ℃; The finishing temperature of described finish rolling can be 900-920 ℃, is preferably 905-920 ℃; The thickness of the intermediate slab after described finish rolling can be 3-5mm, is preferably 3-4.5mm.In order to reach the needed start rolling temperature of roughing of hot rolling, can before roughing, first continuously cast bloom be heated in heater to required start rolling temperature when being heated to continuously cast bloom and carrying out roughing.The thickness of the intermediate slab obtaining after described hot rolling is the thickness of the intermediate slab after the described finish rolling here, and after referring to after described hot rolling that finish rolling completes.
According to the present invention, intermediate slab after adopting slower speed of cooling to hot rolling after described hot rolling and before described batching is carried out cooling, under preferable case, after described hot rolling and before described batching, with the speed of cooling of 18-23 ℃/s, the intermediate slab obtaining is cooled to the temperature of batching after hot rolling.
According to the present invention, under preferable case, the water cooling of described cooling employing laminar flow.
According to the present invention, under preferable case, described in the temperature of batching be 740-755 ℃.
According to the present invention, under preferable case, described cold rolling draft is 70-80%.
According to the present invention, under preferable case, the described intermediate slab obtaining after cold rolling keeps terminal temperature in section, described overaging section and described secondary cooling section to be respectively 750-770 ℃, 820-838 ℃, 200-220 ℃, 285-315 ℃, 260-290 ℃, 80-90 ℃ at described heating zone, described soaking zone, a described cooling section, described low temperature, and the residence time is respectively 45-65s, 40-50s, 300-325s, 75-90s, 275-285s, 145-160s.
At this, the terminal temperature of described heating zone refers to temperature when the described intermediate slab obtaining after cold rolling enters described soaking zone through described heating zone; The terminal temperature of described soaking zone refers to temperature when the described intermediate slab obtaining after cold rolling enters a described cooling section through described soaking zone; The terminal temperature of a described cooling section refers to that the described intermediate slab obtaining after cold rolling enters through a described cooling section temperature that described low temperature keeps section; Described low temperature keeps the terminal temperature of section to refer to temperature when the described intermediate slab obtaining after cold rolling keeps section to enter described overaging section through described low temperature; 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 the present invention, preferably adopt the heating means of flame (anaerobic heating).
According to the present invention, the type of heating of described soaking 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, by the intermediate blank of a described cooling section, enter into this low temperature and keep, in section, the temperature with lower is carried out to heat temperature raising, type of heating can various heating means known in the field, for example, can adopt the heating means of use electrically heated radiator tube.
According to the present invention, the method for the temperature of described control overaging section can be conventional temperature control method, and for example the method for the temperature of described control overaging section is for to heat overaging section with electrically heated radiator tube and/or to adopt gas blower to lower the temperature.
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 unit elongation of described polishing is 0.2-0.8%, and under preferable case, the unit elongation of described polishing is 0.3-0.7%, more preferably 0.45-0.55%.
According to the present invention, the unit elongation of described straightening is 0.1-0.7%, and under preferable case, the unit elongation of described straightening is 0.1-0.5%, more preferably 0.25-0.35%.
According to the present invention, by making the unit elongation of described polishing and the unit elongation of described straightening in above-mentioned scope, can there is the plate surface quality of assurance and the good effect of plate shape.
The cold-rolled steel sheet that the present invention also provides above-mentioned preparation method to prepare.
Cold-rolled steel sheet provided by the invention has good mechanical property, the yield strength R of described cold-rolled steel sheet
eLfor 140-170MPa, be preferably 150-170MPa; Tensile strength R
mfor 260-300MPa, be preferably 280-300MPa; Elongation after fracture A
80>=44%, be preferably 44-48%; Plastic strain ratio r
90>=2.5, be preferably 2.5-2.9; Work hardening exponent n
90>=0.25, be preferably 0.25-0.29.
The microstructure of cold-rolled steel sheet provided by the invention is ferritic structure, and ferrite grain size is more than 8.0 grades, is preferably 8.0-9.5 level, and ferrite grain size is 16-23 μ m.
By method of the present invention, can control the yield strength R of gained cold-rolled steel sheet
eLwithin the scope of 140-170MPa and tensile strength R
mwithin the scope of 260-300MPa, there is good forming property (elongation after fracture A simultaneously
80>=44%, plastic strain ratio r
90>=2.5, work hardening exponent n
90>=0.25), be a kind of steel plate that is specially adapted to automobile, the whole impact briquetting component of motorcycle field (being for example plate in automobile front wall), there are good market outlook.
Below will describe the present invention by embodiment.
In following examples and comparative example, the measuring method of the mechanical property of cold-rolled steel sheet is: yield strength R
eL, tensile strength R
m, elongation after fracture A
80testing method according to GBT228-2002 metallic substance tensile test at room temperature method, carry out; Plastic strain ratio r
90testing method according to the measuring method of GBT5027-2007 metal sheet and strip plastic strain ratio (r value), carry out; Work hardening exponent n
90testing method according to GBT5028-2008 metal sheet and strip tension strain hardenability value (n value) test method, carry out.
The continuous annealing unit using in following examples and comparative example comprises that heating zone, soaking zone, cooling section, a low temperature keep section, overaging section and secondary cooling section successively.Described heating zone is that non-oxidation furnace (NOF) heats by the straight fire of coal gas, and described soaking zone heats by electrically heated radiator tube; A described cooling section by jet carry out cooling; Described low temperature keeps section to heat by electrically heated radiator tube; Described overaging section is by carrying out temperature control with electrically heated radiator tube and gas blower; Described secondary cooling section by jet carry out cooling.
In following examples and comparative example, in process for cooling, the cooling type of cooling is laminar flow water cooling.
Embodiment 1-3
The present embodiment is used for illustrating cold-rolled steel sheet of the present invention and preparation method thereof.
Converter smelting, through LF stove Ca process, RH decarburization and continuous casting obtain continuously cast bloom of the present invention (thickness is 200mm), its moiety is in Table 1.This continuous casting steel billet is heated to the start rolling temperature of roughing and enters reversible roughing unit in process furnace, intermediate blank after roughing enters Coil Box, make to be with steel toe, tail transposing, then carry out finish rolling, after finish rolling and according to the speed of cooling of appointment, be cooled to coiling temperature, to send into reeling machine, batch (hot rolling technology, process for cooling and batch according to the condition in table 2 and carry out).Then be cooled to after room temperature (25 ℃), according to the cold rolling and continuous annealing process shown in table 3, slab is carried out to cold rolling and anneal again, the slab being about to after batching rolls into the cold-reduced sheet of appointed thickness on cold-rolling mill with the cold rolling draft of appointment, and then the unit speed of controlling continuous annealing machine is annealed to this cold-rolled steel sheet, heating zone (NOF) is passed through in described continuous annealing successively, soaking zone (RTH), a cooling section (GJS), low temperature keeps section (LTH), overaging section section (OAS) and secondary cooling section (FCS), then after being cooled to room temperature, according to the technique in table 3, carry out polishing and straightening again.The mechanical property of the cold-rolled steel sheet finally obtaining and the data of microstructure are in Table 4, and Fig. 1-3 are shown in respectively by the photo of its microstructure.
Comparative example 1
According to the method described in embodiment 1, described different, converter smelting, through LF stove Ca process, RH decarburization is different with the moiety of the continuously cast bloom that continuous casting obtains, be shown in Table 1, the performance test results that obtains steel plate is shown in Table 4, and Fig. 4 is shown in by the photo of its microstructure.
Comparative example 2
According to the method described in embodiment 1, difference is, the speed of cooling of taking in process for cooling is 30 ℃/s, and the performance test results that obtains steel plate is shown in Table 4, and Fig. 5 is shown in by the photo of its microstructure.
Comparative example 3
According to the method described in embodiment 1, difference is, the cold rolling draft of taking in cold-rolling process is 65%, and the thickness rolling into is 1.5mm,, the performance test results that obtains steel plate is shown in Table 4, and Fig. 6 is shown in by the photo of its microstructure.
Comparative example 4
According to the method described in embodiment 1, difference is, the control difference of continuous annealing process is as shown in table 3, and the performance test results that obtains steel plate is shown in Table 4, and Fig. 7 is shown in by the photo of its microstructure.
Table 1
Note: surplus is iron and inevitable impurity
Table 2
Table 3
Table 4
Note :-
* 1represent that tension specimen testing process sample is disconnected in advance, cannot measure n value and r value;-
* 2represent to be organized as not perfect recrystallization tissue, cannot measure grain fineness number and grain-size.
By the data in table 1-4, can find out, adopt preparation method of the present invention, can obtain yield strength R
eLfor 140-170MPa, tensile strength R
mfor 260-300MPa, elongation after fracture A
80>=44%, plastic strain ratio r
90>=2.5, work hardening exponent n
90>=0.25, and the ferritic structure that microstructure is 100%, ferrite grain size is more than 8.0 grades, ferrite grain size be 16-23 μ m the cold-rolled steel sheet that forming property is good and plastic strain ratio is high, be particularly suitable for the preparation of the whole impact briquetting component of automobile, motorcycle field.On the other hand, although comparative example 4 has obtained higher intensity, its forming property is obviously poor, is difficult to use in the preparation of automobile, the whole impact briquetting component of motorcycle field; Although comparative example 1-3 has obtained the intensity suitable with the embodiment of the present application 1-3, its forming property is also obviously poor, is difficult to use in the preparation of automobile, the whole impact briquetting component of motorcycle field.
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 the 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, between various embodiment of the present invention, also can carry out arbitrary combination, 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, polishing and straightening, it is characterized in that,
After described hot rolling and before described batching, with the speed of cooling of 15-25 ℃/s, the intermediate slab obtaining is cooled to the temperature of batching after hot rolling;
Described temperature of batching is 730-755 ℃;
Described cold rolling draft is 65-85%;
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 successively, soaking zone, a cooling section, low temperature keeps section, overaging section and secondary cooling section, the described intermediate slab obtaining after cold rolling is in described heating zone, described soaking zone, a described cooling section, described low temperature keeps section, terminal temperature in described overaging section and described secondary cooling section is respectively 740-780 ℃, 800-850 ℃, 150-220 ℃, 200-340 ℃, 200-290 ℃, below 100 ℃, the residence time is respectively 30-80s, 30-60s, 260-440s, 60-100s, 240-300s, 120-180s,
Consisting of of described slab: C:0.001-0.005 % by weight, Si :≤0.03 % by weight, Mn:0.1-0.3 % by weight, P:0.005-0.015 % by weight, S:0.005-0.015 % by weight, Ti:0.035-0.075 % by weight, Nb:0.005-0.03 % by weight, Al:0.01-0.08 % by weight, surplus is Fe and inevitable impurity.
2. preparation method according to claim 1, wherein, after described hot rolling and before described batching, with the speed of cooling of 18-23 ℃/s by the intermediate slab obtaining after hot rolling to the temperature of batching.
3. preparation method according to claim 1, wherein, described in the temperature of batching be 740-755 ℃.
4. preparation method according to claim 1, wherein, described cold rolling draft is 70-80%.
5. preparation method according to claim 1, wherein, the described intermediate slab obtaining after cold rolling keeps terminal temperature in section, described overaging section and described secondary cooling section to be respectively 750-770 ℃, 820-838 ℃, 200-220 ℃, 285-315 ℃, 260-290 ℃, 80-90 ℃ at described heating zone, described soaking zone, a described cooling section, described low temperature, and the residence time is respectively 45-65s, 40-50s, 300-325s, 75-90s, 275-285s, 145-160s.
6. preparation method according to claim 1, wherein, consisting of of described slab: C:0.002-0.004 % by weight, Si:0.01-0.03 % by weight, Mn:0.1-0.25 % by weight, P:0.005-0.013 % by weight, S:0.008-0.015 % by weight, Ti:0.05-0.065 % by weight, Nb:0.01-0.03 % by weight, Al:0.04-0.07 % by weight, surplus is Fe and inevitable impurity.
7. method according to claim 1, wherein, described hot rolling comprises roughing and finish rolling; The start rolling temperature of described roughing is 1190-1225 ℃, and the finishing temperature of described roughing is 1160-1190 ℃; The start rolling temperature of described finish rolling is 1135-1165 ℃, and the finishing temperature of described finish rolling is 900-920 ℃.
8. preparation method according to claim 1, wherein, the unit elongation of described polishing is 0.2-0.8%; The unit elongation of described straightening is 0.1-0.7%.
9. the cold-rolled steel sheet of preparing according to the preparation method described in any one in claim 1-8.
10. cold-rolled steel sheet according to claim 9, wherein, the yield strength R of described cold-rolled steel sheet
eLfor 140-170MPa, tensile strength R
mfor 260-300MPa, elongation after fracture A
80>=44%, plastic strain ratio r
90>=2.5, work hardening exponent n
90>=0.25.
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| CN102912226A (en) * | 2012-10-17 | 2013-02-06 | 首钢总公司 | Secondary work brittleness resistant DC06 automotive steel and production method thereof |
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| JP2005154906A (en) * | 2000-02-29 | 2005-06-16 | Jfe Steel Kk | High tensile strength cold-rolled steel sheet having excellent strain age hardening property, and its production method |
| US20040168753A1 (en) * | 2000-06-20 | 2004-09-02 | Nkk Corporation | Steel sheet and method for manufacturing the same |
| CN101348883A (en) * | 2008-09-11 | 2009-01-21 | 北京科技大学 | Niobium and titanium composite added ultra-low carbon baking hardening steel plate 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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