CN104233067A - Hot-dip galvanized steel sheet with high work hardening index for automobiles and production method of hot-dip galvanized steel sheet - Google Patents
Hot-dip galvanized steel sheet with high work hardening index for automobiles and production method of hot-dip galvanized steel sheet Download PDFInfo
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- CN104233067A CN104233067A CN201410466697.1A CN201410466697A CN104233067A CN 104233067 A CN104233067 A CN 104233067A CN 201410466697 A CN201410466697 A CN 201410466697A CN 104233067 A CN104233067 A CN 104233067A
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Abstract
The invention discloses a hot-dip galvanized steel sheet with a high work hardening index for automobiles and a production method of the hot-dip galvanized steel sheet. The hot-dip galvanized steel sheet comprises the following chemical components in percentage by mass: not less than 0.003% and not more than 0.005% of C, not more than 0.1% of Mn, not more than 0.01% of Si, not more than 0.02% of P, not less than 2.67 of S/C, not more than 0.015% of S, not less than 0.02% and not more than 0.07% of Alt, not more than 0.004% of N, not less than 0.02% and not more than 0.06% of Ti-4C-1.5S-3.42N, not more than 0.02% of Cu+Cr+Ni, and the balance of Fe and microelements. According to the steel sheet, the sulphur content in the steel-making process is adjusted by composition proportion, production is carried out on the basis of optimization of a hot rolling process, and the hot-dip galvanized steel sheet has relatively high work hardening index n90 value, and can meet the production requirements of drawing and bulging automobile sheets.
Description
Technical field
The application relates to metal material processing field, particularly relates to a kind of automobile high work hardening exponent hot-dip galvanizing sheet steel and production method thereof.
Background technology
Gap-free atom automobile is with high work hardening exponent hot-dip galvanizing sheet steel (DX54D+Z), continuous annealing process is now adopted to produce in a large number, it is used for automotive industry, comprising the part of many drawing-swollen type shaping (abbreviation draws and is expanded into shape), as: door inner panel, beater or beat-up, floor side member etc., by the requirement of CB/T 2518-2008 to similar steel grade, its chemical composition mass percent is: C≤0.12%, Mn≤0.60%, Si≤0.50%, P≤0.10%, S≤0.045%, Ti≤0.30%, surplus is Fe.GB CB/T 2518-2008 requires 120MPa≤Rel≤220MPa to its yield strength, and tensile strength requires 260MPa≤Rm≤350MPa, and elongation after fracture requires A80 >=36%, n90 >=0.18, r90 >=1.6.Be C≤0.12% to its component requirements in Europe superscript EN10346-2009, Mn≤0.60%, S≤0.50%, P≤0.10%, Ti≤0.30%, its performance requriements is yield strength 120MPa≤Rel≤220MPa, tensile strength 260MPa≤Rm≤350MPa, elongation after fracture requires A80 >=36%, n90 >=0.17, r90 >=1.6.For this steel grade, usually produce the Rel obtained within the scope of 140-200MPa, A80 >=41%, n90 is within the scope of 0.19-0.23, and r90 within the scope of 2.2-2.7, and draws when being expanded into shape and often requires Rel≤180MPa, A80 >=43%, n90 >=0.23, r90 >=2.0.Therefore at present the work hardening exponent n90 value of this steel grade is on the low side, more difficultly satisfiedly draws the requirement being expanded into shape.
Summary of the invention
The invention provides a kind of automobile high work hardening exponent hot-dip galvanizing sheet steel and production method thereof, it is on the low side by high work hardening exponent hot-dip galvanizing sheet steel work hardening exponent n90 value that object is to overcome existing gap-free atom automobile, is unfavorable for carrying out drawing the problem being expanded into shape.
For solving the problems of the technologies described above, the invention provides a kind of automobile high work hardening exponent hot-dip galvanizing sheet steel and production method thereof, described hot-dip galvanizing sheet steel chemical composition mass percent is: 0.003%≤C≤0.005%, Mn≤0.1%, Si≤0.01%, P≤0.02%, S/C >=2.67, S≤0.015%, 0.02%≤Alt≤0.07%, N≤0.004%, 0.02%≤Ti-4C-1.5S-3.42N≤0.06%, Cu+Cr+Ni≤0.02%, surplus is Fe and trace element.
Preferably, the automobile production method of high work hardening exponent hot-dip galvanizing sheet steel comprises:
Molten iron is obtained slab by smelting;
Heated by slab, Heating temperature is 1100 DEG C ~ 1200 DEG C;
Slab after heating obtains hot-rolled sheet, total reduction >=0.5 of last three passages of finish rolling through roughing and finish rolling.
Cooled by described hot-rolled sheet, be curled into hot rolled coil after cooling, coiling temperature is 740 DEG C ± 20 DEG C;
By described hot rolled coil by the chill volume of cold rolling acquisition;
By described chill volume through continuous annealing with zinc-platedly obtain described hot-dip galvanizing sheet steel.
By one or more technical scheme of the present invention, the present invention has following beneficial effect or advantage:
A kind of automobile provided by the invention high work hardening exponent hot-dip galvanizing sheet steel and production method thereof, chemical composition mass percent is: 0.003%≤C≤0.005%, Mn≤0.1%, Si≤0.01%, P≤0.02%, S/C >=2.67, S≤0.015%, 0.02%≤Alt≤0.07%, N≤0.004%, 0.02%≤Ti-4C-1.5S-3.42N≤0.06%, Cu+Cr+Ni≤0.02%, surplus is Fe and trace element.This steel plate is mainly by composition proportion, and the sulphur content of adjustment steelmaking process, the basis be optimized produces, have the advantages that work hardening exponent n90 value is higher, can meet the need of production drawing and be expanded into shape auto sheet hot rolling technology.
Accompanying drawing explanation
Fig. 1 is the in-fighting peak value figure of the automobile solid solution carbon in high work hardening exponent hot-dip galvanizing sheet steel related in the embodiment of the present invention;
Fig. 2 be in the embodiment of the present invention superfluous titanium on the impact of hot rolled coil grain-size;
Fig. 3 is the automobile TiC solubility product graphic representation in ferrite in high work hardening exponent hot-dip galvanizing sheet steel in the embodiment of the present invention;
Fig. 4 is by precipitate photo that transmission electron microscope records in the embodiment of the present invention;
Fig. 5 is the metallographic structure photo in the embodiment of the present invention.
Embodiment
In order to make the application the technical staff in the technical field more clearly understand the application, below in conjunction with accompanying drawing, by specific embodiment, technical scheme is described in detail.
In general, automobile depends on its precipitate quantity, precipitate kind and grain-size with the work hardening exponent of high work hardening exponent hot-dip galvanizing sheet steel.Granular Second Phase Precipitation thing is separated out more abundant at intra-die, and grain fineness number size is larger, and work hardening exponent value is larger.
The present invention mainly introduces automobile high work hardening exponent hot-dip galvanizing sheet steel and production method thereof, by to the optimization design of automobile with high work hardening exponent hot-dip galvanizing sheet steel composition, adjustment and optimization hot-rolled process parameter, successfully produce the high work hardening exponent hot-dip galvanizing sheet steel of automobile.The automobile provided by the invention chemical composition mass percent of high work hardening exponent hot-dip galvanizing sheet steel is: 0.003%≤C≤0.005%, Mn≤0.1%, Si≤0.01%, P≤0.02%, S/C >=2.67, S≤0.015%, 0.02%≤Alt≤0.07%, N≤0.004%, 0.02%≤Ti-4C-1.5S-3.42N≤0.06%, Cu+Cr+Ni≤0.02%, surplus is Fe and trace element.
Composition Design principle of the present invention is as follows:
C: because carbon exists with interstitial atom and cementite form in ferrite, there is strong strengthening effect in steel, be unfavorable for viscous deformation.In order to reduce the yield strength of the high work hardening exponent hot-dip galvanizing sheet steel of automobile and improve unit elongation, carbon content must strictly be controlled.If but carbon content is too low, be then unfavorable for Second Phase Precipitation thing TiC and Ti forming more disperse in IF steel
4c
2s
2, be unfavorable for improving work hardening exponent.Therefore in the present invention, the mass percent of C is controlled 0.003% ~ 0.005%.The in-fighting peak value of the solid solution carbon utilizing Internal Friction Meter to measure as shown in Figure 1.
P, Mn and Si: phosphorus, manganese and silicon are all the strengthening elements in steel, are generally solid-solubilized in ferrite, unfavorable to punching performance, and the too high meeting of P content causes the FeTiP of needle-like to separate out, unfavorable to raising work hardening exponent.Therefore the mass percent of Si controls below 0.01% by the present invention, and the mass percent of Mn controls below 0.1%, and the mass percent of P controls below 0.02%.
S: sulphur is the harmful element in steel, brittle rupture is brought out in the too high meeting of content, and therefore its mass percent in steel of general requirement is lower than 0.015%.If but S content is too low, then cannot form enough Ti in the hot rolling
4c
2s
2precipitate, be unfavorable for improving work hardening exponent, therefore require that the atomic ratio of S and C is greater than 1, amounting to into mass percent than is then 2.67≤S/C.Solid solution carbon in steel matrix and the stability contorting of sulphur content are the stable guarantee that provides the foundation of precipitate.
Alt: aluminium is the reductor in steel-making, if content is lower than 0.02%, cannot remove the oxide compound in steel completely, as SiO
2and MnO, cause processing characteristics significantly to reduce.If more than 0.07%, substantially saturated.
N: nitrogen is substantially identical with the effect of carbon, has strong strengthening effect, therefore needs the pole low-level being controlled by its content can reach at state-of-the art, requires≤0.004% in the present invention.
Superfluous titanium Ti-4C-1.5S-3.42N: titanium has important effect in gapless atomic steel, can carbon, nitrogen and sulphur in steel be combined formation second phase particles as TiC and separate out in crystal grain in steel-making and course of hot rolling, thorough elimination carbon, nitrogen and sulphur are to the disadvantageous effect of steel plate punched performance, and therefore the superfluous titanium (Ti-4C-1.5S-3.42N) of general requirement can not be too low.Meanwhile, superfluous titanium (i.e. Ti-4C-1.5S-3.42N) content has larger impact to hot rolling grain-size, and as shown in Figure 2, and larger hot rolling grain-size is conducive to improving work hardening exponent.Therefore in the present invention, the mass percent of superfluous titanium (Ti-4C-1.5S-3.42N) is controlled at 0.02%-0.06%.
Ni, Cu, Cr: these three kinds of elements all belong to the impurity element that steelmaking process Raw is brought into, do not have specific requirement in general production.Usually be solid-solubilized in ferrite and play certain strengthening effect.In order to reduce impurity element to the impact of automobile by high work hardening exponent hot-dip galvanizing sheet steel yield strength, needing to make regulation to the three kinds of constituent content upper limits of this in raw material, requiring Cu+Cr+Ni≤0.02% in the present invention.
The automobile comprising mentioned component provided by the invention specifically comprises following step by the production method of high work hardening exponent hot-dip galvanizing sheet steel:
Molten iron is obtained slab by smelting;
Heated by slab, Heating temperature is 1100 DEG C ~ 1200 DEG C;
Slab after heating obtains hot-rolled sheet, total reduction >=0.5 of last three passages of finish rolling through roughing and finish rolling.
Then cooled by hot-rolled sheet, be curled into hot rolled coil after cooling, coiling temperature is 740 DEG C ± 20 DEG C;
By hot rolled coil by the chill volume of cold rolling acquisition;
By chill volume through continuous annealing with zinc-platedly obtain the high work hardening exponent hot-dip galvanizing sheet steel of automobile.
Production method principle of the present invention is as follows:
Slab heating temperature: slab heating temperature is adjusted to 1100 DEG C ~ 1200 DEG C by the present invention, and this temperature range makes Ti
4s
2c
2precipitate again can not dissolve in rough rolling process, for the precipitation of TiC provides guarantee.
The total reduction of last three passages of finish rolling: the total reduction of last for finish rolling three passages is adjusted to by the present invention >=and 0.8, this draft can be guaranteed to store enough straiies energy of distortion in the band steel of finish rolling outlet, can excite the precipitation of TiC particle in follow-up coiling process.
Coiling temperature: coiling temperature is adjusted to 720 DEG C ~ 760 DEG C by the present invention, this temperature range makes TiC fully separate out.The solubility product curve of TiC in ferrite as shown in Figure 3.
Utilize a kind of automobile provided by the invention high work hardening exponent hot-dip galvanizing sheet steel and production method thereof, the automobile of acquisition with high work hardening exponent hot-dip galvanizing sheet steel work hardening exponent more than 0.23.
The present invention is by optimizing Composition Design, adjustment and optimization hot-rolled process parameter, successfully produce automobile with high work hardening exponent hot-dip galvanizing sheet steel (DX54D+Z), the high work hardening exponent hot-dip galvanizing sheet steel of the automobile produced has the feature of high work hardening exponent, can bring considerable economic benefit.
Embodiment 1:
According to the high work hardening exponent hot-dip galvanizing sheet steel of automobile that the method provided in the present invention is produced, its chemical composition mass percent is: C:0.005%, Mn:0.1%, Si:0.010%, P:0.02%, S:0.015%, S/C:3, Alt:0.07%, N:0.004%, Ti-4C-1.5S-3.42N:0.06%, Cu+Cr+Ni:0.02%, surplus is Fe and trace element.The production technique of this auto sheet steel is first molten iron is carried out smelting to obtain steel billet, again slab is heated, slab heating temperature is 1200 DEG C, the total reduction of last three passages of finish rolling is 0.5, coiling temperature is 720 DEG C, through cold rolled annealed zinc-plated after last obtain the high work hardening exponent hot-dip galvanizing sheet steel of automobile that specification is 0.5 × 1000mm.Its mechanical property is as shown in table 1.TiC precipitate in band steel after utilizing transmission electron microscope to record annealing as shown in Figure 4.Band crystalline grain of steel after annealing as shown in Figure 5.
Table 1
| Re,MPa | Rm，MPa | A 80，％ | n90 | r90 |
| 154 | 294 | 45 | 0.23 | 2.23 |
| 158 | 299 | 44 | 0.23 | 2.35 |
| 152 | 301 | 43 | 0.23 | 2.54 |
| 149 | 289 | 44 | 0.24 | 2.78 |
Embodiment 2:
According to the high work hardening exponent hot-dip galvanizing sheet steel of automobile that the method provided in the present invention is produced, its chemical composition mass percent is: C:0.003%, Mn:0.05%, Si:0.007%, P:0.01%, S:0.008%, S/C:2.67, Alt:0.04%, N:0.002%, Ti-4C-1.5S-3.42N:0.04%, Cu+Cr+Ni:0.01%, surplus is Fe and trace element.Slab heating temperature is 1100 DEG C, and the total reduction of last three passages of finish rolling is 0.7, and coiling temperature is 740 DEG C, through cold rolled annealed zinc-plated after last obtain the high work hardening exponent hot-dip galvanizing sheet steel of automobile that specification is 0.7 × 1200mm.Its mechanical property is as shown in table 2.
Table 2
| Re,MPa | Rm，MPa | A 80，％ | n90 | r90 |
| 143 | 278 | 47 | 0.25 | 2.74 |
| 145 | 277 | 46 | 0.24 | 2.68 |
| 143 | 270 | 45 | 0.24 | 2.59 |
Embodiment 3:
According to the high work hardening exponent hot-dip galvanizing sheet steel of automobile that the method provided in the present invention is produced, its chemical composition mass percent is: C:0.004%, Mn:0.08%, Si:0.008%, P:0.015%, S:0.013%, S/C:3.25, Alt:0.05%, N:0.003%, Ti-4C-1.5S-3.42N:0.02%, Cu+Cr+Ni:0.015%, surplus is Fe and trace element.Slab heating temperature is 1150 DEG C, and the total reduction of last three passages of finish rolling is 0.8, and coiling temperature is 760 DEG C, and steel plate specification is 0.8 × 1450mm.Its mechanical property is as shown in table 3.
Table 3
| Re,MPa | Rm，MPa | A 80，％ | n90 | r90 |
| 150 | 284 | 44.5 | 0.23 | 2.45 |
| 153 | 280 | 44 | 0.24 | 2.58 |
| 143 | 276 | 45.5 | 0.25 | 2.34 |
| 145 | 281 | 45 | 0.25 | 2.49 |
By one or more embodiment of the present invention, the present invention has following beneficial effect or advantage:
A kind of automobile provided by the invention high work hardening exponent hot-dip galvanizing sheet steel and production method thereof, chemical composition mass percent is: 0.003%≤C≤0.005%, Mn≤0.1%, Si≤0.01%, P≤0.02%, S/C >=2.67, S≤0.015%, 0.02%≤Alt≤0.07%, N≤0.004%, 0.02%≤Ti-4C-1.5S-3.42N≤0.06%, Cu+Cr+Ni≤0.02%, surplus is Fe and trace element.This steel plate is mainly by composition proportion, and the sulphur content of adjustment steelmaking process, the basis be optimized produces, have the advantages that work hardening exponent n90 value is higher, can meet the need of production drawing and be expanded into shape auto sheet hot rolling technology.
Although described the preferred embodiment of the application, one of ordinary skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the application's scope.
Obviously, those skilled in the art can carry out various change and modification to the application and not depart from the spirit and scope of the application.Like this, if these amendments of the application and modification belong within the scope of the application's claim and equivalent technologies thereof, then the application is also intended to comprise these change and modification.
Claims (2)
1. automobile high work hardening exponent hot-dip galvanizing sheet steel and a production method thereof, is characterized in that, described hot-dip galvanizing sheet steel chemical composition mass percent is:
0.003%≤C≤0.005%, Mn≤0.1%, Si≤0.01%, P≤0.02%, S/C >=2.67, S≤0.015%, 0.02%≤Alt≤0.07%, N≤0.004%, 0.02%≤Ti-4C-1.5S-3.42N≤0.06%, Cu+Cr+Ni≤0.02%, surplus is Fe and trace element.
2. automobile high work hardening exponent hot-dip galvanizing sheet steel and production method thereof as claimed in claim 1, it is characterized in that, the production method of described hot-dip galvanizing sheet steel comprises:
Molten iron is obtained slab by smelting;
Heated by slab, Heating temperature is 1100 DEG C ~ 1200 DEG C;
Slab after heating obtains hot-rolled sheet, total reduction >=0.5 of last three passages of finish rolling through roughing and finish rolling;
Cooled by described hot-rolled sheet, be curled into hot rolled coil after cooling, coiling temperature is 740 DEG C ± 20 DEG C;
By described hot rolled coil by the chill volume of cold rolling acquisition;
By described chill volume through continuous annealing with zinc-platedly obtain described hot-dip galvanizing sheet steel.
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Cited By (1)
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| JP2009108373A (en) * | 2007-10-30 | 2009-05-21 | Nippon Steel Corp | Steel sheet for galvannealed steel sheet, and galvannealed steel sheet |
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| CN108998742A (en) * | 2018-08-08 | 2018-12-14 | 南京钢铁股份有限公司 | A kind of extremely low yield strength steel plate and its manufacturing method |
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