CN102653839A - Low-temperature continuous-annealing interstitial-free atom cold-rolled steel plate and production method thereof - Google Patents
Low-temperature continuous-annealing interstitial-free atom cold-rolled steel plate and production method thereof Download PDFInfo
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Abstract
The invention relates to a low-temperature continuous-annealing interstitial-free atom cold-rolled steel plate and a production method thereof and belongs to the technical field of iron-based alloys. The production method of the cold-rolled steel plate comprises the following steps of: controlling the components of the cold-rolled steel plate in percentage by mass: 0.0005-0.0025% of C, less than or equal to 0.03% of Si, 0.05-0.15% of Mn, less than or equal to 0.015% of P, less than or equal to 0.01% of S, less than or equal to 0.0025% of O, less than or equal to 0.0025% of N, 0.015-0.050% of Al, 0.03-0.07% of Ti, and the balance of Fe and inevitable mixed elements; and meanwhile, controlling the continuous-annealing temperature of the cold-rolled steel plate to be 710-740 DEG C, and controlling the cold-rolling reduction ratio to be not less than 80%. According to the cold-rolled steel plate and the production method thereof, the reasonable chemical components and the suitable control of cold-rolling reduction are adopted, the recrystallization temperature is lowered, full-old-rolled microstructures are formed, and a lower continuous-annealing temperature can be adapted, so that the equipment cost and energy consumption are reduced, the control difficulty of a production process is reduced, the product defects and production accidents are avoided.
Description
Technical field
The present invention relates to a kind of gap-free atom cold-rolled steel sheet, and relate to a kind of working method of this cold-rolled steel sheet, belong to the ferrous alloy technical field.
Background technology
Gapless atomic steel is called IF steel (abbreviation of Interstitial-Free Steel) again.Because therefore atom very close to each other has excellent deep drawability and non-ageing, in industries such as automobile, household electrical appliances, five metals, has obtained in a large number, has used widely.Gap-free atom cold-rolled steel sheet particularly, after cold rolling through the anneal more than the recrystallization temperature after, can access good microcosmic texture, have excellent more drawing performance.For the annealing way of gap-free atom cold-rolled steel sheet two kinds of bell-type annealing technology and continuous annealing processes are arranged.Compare with bell-type annealing technology, continuous annealing has 1) mechanical property is even on band steel length and the width; 2) the belt steel flating degree is high, and plate shape is good; 3) annealing process does not have bonding phenomenon, and strip surface quality is good.Therefore, continuous annealing process is produced the gap-free atom cold-rolled steel sheet and has been obtained application widely.
But know that according to the applicant the existing recrystallization temperature of gap-free atom cold-rolled steel sheet when continuous annealing is higher, therefore need higher continuous annealing temperature (general >=780 ℃).In actual production, on the one hand, need be used for the annealed continuous annealing furnace and have higher temperature capability like this, thus construction, maintenance cost and the energy consumption of increase lehre; On the other hand,, the tension force of band steel, difficulty smooth and steady running control are increased, and formed product defects such as muscle, rib typesetting and printing easily even caused industrial accident such as broken belt because annealing temperature is high.
Summary of the invention
The technical problem that the present invention solves is: propose a kind of low recrystallization temperature that when continuous annealing, has, promptly can carry out the gap-free atom cold-rolled steel sheet of the good drawing performance of having of continuous annealing at a lower temperature; Thereby reduce equipment cost and energy consumption, reduce the controlling of production process difficulty, avoid product defects and industrial accident.
In order to solve the problems of the technologies described above, one of technical scheme that the present invention proposes is: a kind of low temperature continuous annealing gap-free atom cold-rolled steel sheet, and the temperature of said cold-rolled steel sheet when continuous annealing is 710-740 ℃; Composition that said cold-rolled steel sheet contains and mass percentage content are: C:0.0005～0.0025%, Si≤0.03%, Mn:0.05-0.2%; P≤0.015%, S≤0.01%, 0≤0.0025%; N≤0.0025%; Al:0.015～0.050%, Ti:0.03 ∽ 0.07%, all the other are Fe and inevitable tramp element; The ratio X of the mass percentage content of said Ti composition and C composition, N composition and S composition satisfies following formula,
In order to solve the problems of the technologies described above, two of the technical scheme that the present invention proposes is: a kind of working method of low temperature continuous annealing gap-free atom cold-rolled steel sheet comprises steel making working procedure, hot-rolled process, cold rolling process and continuous annealing operation; The composition and the mass percentage content that it is characterized in that the said cold-rolled steel sheet of control in the said steel making working procedure are: C:0.0005～0.0025%, Si≤0.03%, Mn:0.05-0.2%; P≤0.015%, S≤0.01%, 0≤0.0025%; N≤0.0025%; Al:0.015～0.050%, Ti:0.03 ∽ 0.07%, all the other are Fe and inevitable tramp element; In the said hot-rolled process, the Heating temperature of control continuous casting steel billet is 1080～1160 ℃, and in the said continuous annealing operation, controlled temperature is 710-740 ℃; In the said cold rolling process, control draft>=80%.
The improvement of one of technique scheme is: the continuous casting steel billet Heating temperature of said cold-rolled steel sheet when hot rolling is 1080～1160 ℃, draft >=80% of said cold-rolled steel sheet when cold rolling.
The further improvement of one of technique scheme is: said ratio X is 1.5～2.0.
The further improvement of one of technique scheme is: intermediate blank after the roughing of said cold-rolled steel sheet when hot rolling through the Coil Box rolling after again uncoiling get into 7 passage finish rolling; The finish rolling start rolling temperature of said cold-rolled steel sheet when hot rolling is 960 ℃～1020 ℃; The finish rolling end temp of said cold-rolled steel sheet when hot rolling is 900 ℃～950 ℃, and coiling temperature is 600 ℃～700 ℃ after the finish rolling of said cold-rolled steel sheet when hot rolling; The soaking zone time of said cold-rolled steel sheet when continuous annealing is 60～160s.
Further improving again of one of technique scheme is: the smooth unit elongation of said cold-rolled steel sheet when smooth is 0.3～1.2%.
Two improvement of technique scheme is: in the said hot-rolled process; The intermediate blank of control after the roughing through the Coil Box rolling after again uncoiling get into 7 passage finish rolling; Control finish rolling start rolling temperature is 960 ℃～1020 ℃; Control finish rolling end temp is 900 ℃～950 ℃, and coiling temperature is 600 ℃～700 ℃ after the control finish rolling; In the said continuous annealing operation, the time of control soaking zone is 60～160s.
Two further improvement of technique scheme is: also comprise the smooth operation in annealing back; In the said smooth operation, controlling smooth unit elongation is 0.3～1.2%.
The perfect of technique scheme is: the mass percentage content of said C composition is 0.008～0.0015%, and the mass percentage content of said Mn composition is 0.08～0.15%, and said draft is 85%～90%; Said finish rolling end temp is 920 ℃, and coiling temperature is 680 ℃ after the said finish rolling, and said draft is 85%～90%.
The theoretical foundation of the chemical constitution in the invention described above technical scheme is:
[carbon]: reduce C content, help the gap-free atom cold-rolled steel sheet and obtain good punching performance, can under lower annealing temperature, obtain low ys and high uniform elongation simultaneously.Because the punching performance of solid solution C heavy damage gapless atomic steel along with the increase of C content, helps { the 111} texture density reduction of punching press after the recrystallization annealing; On the other hand along with the increase of C content; Then can form more carbide with adding Ti atom, make under the identical annealing temperature, the intensity of steel plate increases; Therefore the low yield strength in order needing to obtain needs to increase annealing temperature.Be difficult in industrial production realize that can obviously increase steel-making cost, it is 0.0005～0.0025% that technical scheme of the present invention is set the C content range but cross low C content, preferable range is 0.008～0.0015%.
[silicon]: Si is the unavoidable impurities element in the gap-free atom cold-rolled steel sheet, the plasticity and the forming property of Si content heavy damage cold-rolled steel sheet.But the Si content requirement is crossed the low cost that then can improve the steel-making refining procedure.Technical scheme of the present invention is set Si content≤0.03%.
[manganese]: Mn mainly exists with solid solution condition in the gap-free atom cold-rolled steel sheet, improves armor plate strength, and is unfavorable to the formability index r value of deep drawing steel.Because the Mn element has the solution strengthening effect, if Mn content is high, then can not under lower annealing temperature, obtain lower ys.But low excessively Mn content can increase the hot short risk of steel plate.It is 0.05%～0.2% that technical scheme of the present invention is set the Mn content range, and preferable range is 0.08～0.15%.
[phosphorus]: P can improve the recrystallization temperature of gapless atomic steel, and the annealing temperature of steel requirement is raise, and therefore needs the lower P content of control.Because P gathers at crystal boundary easily partially, can increase the secondary processing brittleness phenomenon of gap-free atom cold-rolled steel sheet simultaneously.Technical scheme of the present invention is set P content P≤0.015%.
[sulphur]: falling S can increase solid solution carbon amount, reduces the grain growth resistance, improves the punching performance of product.S can also consume Ti element useful in the steel with the formation sulfide (TiS, Ti 4C2 S2) in the gapless atomic steel.Therefore gapless atomic steel needs lower S content, but low excessively S content can increase the cost of steel desulfurization.Technical scheme of the present invention is set S content≤0.010%.
[oxygen]: O is the element that can not avoid fully in the steelmaking process, has stronger avidity with other many elements, is easy to form various inclusiones, and is unfavorable to the performance of steel.In addition, the O too high levels can cause the rapid reduction and tangible aging phenomenon of gap-free atom cold-rolling steel-plate punch performance equally.Technical scheme of the present invention is set O content≤0.0025%.
[nitrogen]: N is deleterious impurity element in the gap-free atom cold-rolled steel sheet, and the intensity of steel is raise, and unit elongation descends, and also is unfavorable under the low-temperature annealing temperature, obtaining favourable punching performance.N also is the element that forms timeliness simultaneously, therefore requires to reduce N content.Technical scheme of the present invention is set N content≤0.0025%.
[aluminium]: Al adds in the gapless atomic steel as reductor in steelmaking process, and while Al can also fix a part in steel N atom pairs guarantees that the aging resistance of steel plate is favourable.When Al content in the steel could guarantee the effect of deoxidation greater than 0.015% the time.But when Al measures when too high, can increase cost of alloy, also can form the oxide compound Al of too much deoxidation products Al in addition
2O
3Be mingled with.It is 0.015～0.05% that technical scheme of the present invention is set the Al content range.
[titanium]: Ti is strong carboritride forming element, adds after the Ti and C, N atom are completely fixed and really realize no gap solid solution atom existence in the steel.Ti in the IF steel also will form sulfide (TiS, Ti 4C2 S2) with S except combining with C, N.But Ti content can not be too high, and too high Ti content can be increased sharply the recrystallization temperature of gap-free atom cold-rolled steel sheet, thereby need higher annealing temperature.It is 0.03～0.07% that technical scheme of the present invention is set Ti content.Also set the condition that ratio should satisfy between Ti and C, N, the O content simultaneously, purpose is for the Ti that guarantees to add can enough combine C, N atom, and suitable residual content is arranged.
Technology theory in the invention described above technical scheme is according to being:
One, hot rolling technology
1, continuous casting steel billet Heating temperature
AlN and Ti (C, N) second dissolving of particle mutually will take place in the heat-processed at the gapless atomic steel continuous casting steel billet.If Heating temperature is above 1160 ℃; Then the second phase particle takes place to separate out precipitate more tiny, disperse again in the hot rolling reeling process after the dissolving; Then suppressed to grow up at recrystallize cold rolling, annealing back crystal grain subsequently; The recrystallization temperature of steel plate is raise, can not adapt to low annealing temperature.But Heating temperature can not be too low, if Heating temperature is low excessively, because the natural temperature drop in the course of hot rolling can't guarantee the higher finishing temperature that the present invention requires.
2, Coil Box
Coil Box is after the main effect of the course of hot rolling of gap-free atom cold-rolled steel sheet is to batch through Coil Box; The temperature that makes intermediate blank volume is homogenizing more; Can reach the effect of two aspects like this: temperature is more even on the length direction of band steel, make the band steel toe, in, the property retention of tail is consistent; Reduce the temperature drop of strip edge portion, because the Ar3 transformation temperature of gap-free atom cold-rolled steel sheet is high, under the common rolling state, strip edge portion temperature drop is big, and it is rolling to get into two-phase region easily, makes the final poor performance of CRS edges of boards portion.
3, finish rolling start rolling temperature
Three iron scales of the too high easy formation of finish rolling start rolling temperature, gapless atomic steel is very soft, and three times iron scale is pressed into surface of steel plate easily, in acid cleaning process subsequently, can form pit, influences the surface of cold-rolled steel plate quality.Final rolling temperature is crossed to hang down and then can not be guaranteed the finish rolling end temp.Therefore to set the finish rolling start rolling temperature be 960 ℃～1020 ℃ in the present invention.
4, finish rolling end temp
The hot rolling finish to gauge of gap-free atom cold-rolled steel sheet need be rolling in the austenitic area, and finishing temperature will be higher than the Ar3 transformation temperature, and from refine austenite grain fineness number and the angle that promotes the precipitate alligatoring, finishing temperature can not be too high.It is 900 ℃～950 ℃ that technical scheme therefore of the present invention is set the finish rolling end temp, is preferably 920 ℃.
4, coiling temperature after the finish rolling
Along with the rising of coiling temperature, the recrystallization temperature of gap-free atom cold-rolled steel sheet descends, and press formability index r value improves.The present invention is in order to reduce the recrystallization temperature of gap-free atom cold-rolled steel sheet, sets that coiling temperature is 600 ℃～700 ℃ after the lower finish rolling, is preferably 680 ℃.When selecting 680 ℃, can make the abundant alligatoring of precipitate, be unlikely to make the iron scale of belt steel surface to have a strong impact on acid cleaning process subsequently again.
Two, cold-rolling process
1, cold rolling draft
The r value of gap-free atom cold-rolled steel sheet increases and dull increasing with cold rolling draft, particularly when lesser temps is annealed.This is because increase cold rolling draft, makes the more deformation energy of storage in the steel plate, increases the recrystallize motivating force, reduce recrystallization temperature and can make in the cold rolling texture 111} component increases, thus make the annealing back 111) texture strengthens.The gap-free atom cold-rolled steel sheet can obtain good drawing performance at cold rolling draft >=80%, but mill load increases obviously when draft surpasses 90%, and cold-rolled process stability is bad, causes the broken belt accident easily; The preferred cold rolling draft of the present invention is 85%～90%.
2, the continuous annealing time
The gap-free atom annealing process is the process of a deformed grains recovery and recrystallization, and the time that on kinetics, needs guarantees.Too short like the time, can not carry out sufficient recovery and recrystallization, can not get good drawing performance.Like overlong time, influence production efficiency on the one hand, because the C atom is spread to intracrystalline by crystal boundary, reduced the grain-boundary strength of gap-free atom cold-rolled steel sheet on the other hand, make the gap-free atom steel plate have secondary punching press fragility, use properties worsens.
3, smooth unit elongation
Need carry out smooth after the annealing of gap-free atom cold-rolled steel sheet to reach the surfaceness and control steel-plate shape that needs.Therefore need a minimum smooth unit elongation, unit elongation can not be too high, surpasses 1.2% and can cause that the steel plate ys is too high, and cause the reduction of punching performance.
In a word; Low temperature continuous annealing gap-free atom cold-rolled steel sheet of the present invention and technical characterstic and beneficial effect that working method had are: 1) through control C content and reasonable Ti element and the control unavoidable impurities element of adding; The micro components that is not had gap solid solution atom fully is for establishing the composition basis than obtaining good impact briquetting performance under the low temperature thermal oxidation; 2) through the control of suitable cold roling reduction, store enough energy of deformation, reduce recrystallization temperature and form sufficient cold rolling heterogeneous microstructure; 3) through rational slab heating temperature, batch case technology, finish rolling end temp, coiling temperature control AlN and Ti (C, N) the second phase particle dissolving, separate out and alligatoring; And guarantee band steel length direction and width temperature homogeneity, reduce the recrystallization temperature of steel plate and obtain good hot rolling heterogeneous microstructure; Therefore can adapt to lower continuous annealing temperature (710～740 ℃), thereby reduce equipment cost and energy consumption, reduce the controlling of production process difficulty, avoid product defects and industrial accident.
Description of drawings
Below in conjunction with accompanying drawing low temperature continuous annealing gap-free atom cold-rolled steel sheet of the present invention and working method thereof are described further.
Fig. 1 is the curve that the hardness of the low temperature continuous annealing gap-free atom cold-rolled steel sheet of specific embodiment of the invention embodiment one changes with the annealing soaking time.
Fig. 2 is the metallographic structure figure of the low temperature continuous annealing gap-free atom cold-rolled steel sheet of specific embodiment of the invention embodiment one.
Embodiment
The low temperature continuous annealing gap-free atom cold-rolled steel sheet of this embodiment is divided into four embodiment by its composition and content different, and composition and mass percentage content that the cold-rolled steel sheet of four embodiment contains are as shown in table 1:
Composition and mass percentage content during the steel-making of table 1 cold-rolled steel sheet
The working method of the cold-rolled steel sheet of four embodiment of this embodiment comprises steel making working procedure, hot-rolled process, cold rolling process and continuous annealing operation.
Steel making working procedure comprises: adopt molten iron pre-desulfurization; The converter top bottom blowing; The LF stove heats up and guarantees bottom blowing Ar churning time greater than 5 minutes, and the RH stove carries out vacuum circulation degassing to be handled, and guarantees that the pure degassing time of RH was greater than 15 minutes; Adopt low-carbon steel protecting slag then, whole process is blown the Ar protection and is cast into continuous casting steel billet.
Hot-rolled process comprises: continuous casting steel billet is behind the process furnace reheat; Rolling on the Continuous Heat tandem rolling mill, table 2 is seen in hot-rolled process parameter control, through roughing milling train and finish rolling tandem rolling unit rolling after; Carry out the laminar flow cooling; Batch then, produce qualified hot-rolled sheet coil, product thickness is 2.0-5.0mm.
In hot-rolled process, as shown in table 2 for the processing parameter of controlling hot rolling separately of the cold-rolled steel sheet of above-mentioned four embodiment:
Table 2 hot-rolled process parameter
| The hot rolling parameter | The slab heating | Finish rolling begins | Finish rolling finishes | Coiling temperature | Product thickness |
| Temperature/℃ | Temperature/℃ | Temperature/℃ | /℃ | /mm | |
| Set | 1080-1160 | 960-1020 | 900-950 | 600-700 | 2.0-5.0 |
| Embodiment one | 1100 | 1020 | 920 | 680 | 5.0 |
| Embodiment two | 1130 | 980 | 930 | 700 | 3.5 |
| Embodiment three | 1160 | 1000 | 900 | 600 | 2.0 |
| Embodiment four | 1080 | 960 | 950 | 640 | 4.5 |
Cold rolling process comprises: above-mentioned hot rolled interstitial-free hot-rolled steel is rolled up uncoiling again after overpickling is fallen scale on surface; On the cold continuous rolling or on the reciprocating type single stand mill through after repeatedly cold rolling; And will pass through after cold rolling roll steel band behind the hard state through continuous annealing after smooth; Table 3 is seen in cold-rolling process parameter control, obtains the finished product cold-rolled steel sheet that thickness is 0.2～1.0mm through the steel band that rolls behind the hard state after cold rolling through after the continuous annealing.Cold rolling draft sets >=80%, is preferably 85%～90%.
Annealing operation comprises: steel band is 710～740 ℃ in the annealing region of the soaking zone of continuous annealing furnace, and the band steel is 60～160s in the time of soaking zone, and flattening process is adopted in the annealing back, and smooth unit elongation is 0.3～1.2%, and table 3 is seen in parameter and annealing control.
Cold rolling and the parameter and annealing of table 3
The mechanical property detected result of the cold-rolled steel sheet of above-mentioned four embodiment and the grading of micro-grain fineness number are as shown in table 4:
Table 4 mechanical property measuring result
Appoint the hardness of cold-rolled steel sheet in annealing operation of getting above-mentioned four embodiment (like embodiment two) as shown in Figure 1 with the curve that the annealing soaking time changes; Simultaneously this cold-rolled steel sheet is done metallurgical analysis, as shown in Figure 2.Can find out that from table 4 and Fig. 1, Fig. 2 the cold-rolled steel sheet of above-mentioned four embodiment all has good drawing performance, the microstructure grain size number reaches I6.5～I8.0 level.
Low temperature continuous annealing gap-free atom cold-rolled steel sheet of the present invention and working method thereof are not limited to the described concrete technical scheme of the foregoing description, and the technical scheme that all employings are equal to replacement formation is the protection domain that the present invention requires.
Claims (10)
1. a low temperature continuous annealing gap-free atom cold-rolled steel sheet is characterized in that the temperature of said cold-rolled steel sheet when continuous annealing is 710-740 ℃; Composition that said cold-rolled steel sheet contains and mass percentage content are: C:0.0005～0.0025%, Si≤0.03%, Mn:0.05-0.2%; P≤0.015%, S≤0.01%, O≤0.0025%; N≤0.0025%; Al:0.015～0.050%, Ti:0.03 ∽ 0.07%, all the other are Fe and inevitable tramp element; The ratio X of the mass percentage content of said Ti composition and C composition, N composition and S composition satisfies following formula,
2. according to the said cold-rolled steel sheet of claim 1, it is characterized in that the continuous casting steel billet Heating temperature of said cold-rolled steel sheet when hot rolling is 1080～1160 ℃, draft >=80% of said cold-rolled steel sheet when cold rolling.
3. according to the said cold-rolled steel sheet of claim 2, it is characterized in that said ratio X is 1.5～2.0.
4. according to the said cold-rolled steel sheet of claim 3; It is characterized in that: intermediate blank after the roughing of said cold-rolled steel sheet when hot rolling through the Coil Box rolling after again uncoiling get into 7 passage finish rolling; The finish rolling start rolling temperature of said cold-rolled steel sheet when hot rolling is 960 ℃～1020 ℃; The finish rolling end temp of said cold-rolled steel sheet when hot rolling is 900 ℃～950 ℃, and coiling temperature is 600 ℃～700 ℃ after the finish rolling of said cold-rolled steel sheet when hot rolling; The soaking zone time of said cold-rolled steel sheet when continuous annealing is 60～160s.
5. according to the said cold-rolled steel sheet of claim 4, it is characterized in that the smooth unit elongation of said cold-rolled steel sheet when smooth is 0.3～1.2%.
6. according to the arbitrary said cold-rolled steel sheet of claim 1-5, the mass percentage content that it is characterized in that said C composition is 0.008～0.0015%, and the mass percentage content of said Mn composition is 0.08～0.15%; Said finish rolling end temp is 920 ℃, and coiling temperature is 680 ℃ after the said finish rolling, and said draft is 85%～90%.
7. the working method of a low temperature continuous annealing gap-free atom cold-rolled steel sheet comprises steel making working procedure, hot-rolled process, cold rolling process and continuous annealing operation, it is characterized in that the composition and the mass percentage content of the said cold-rolled steel sheet of control in the said steel making working procedure is: C:0.0005～0.0025%; Si≤0.03%, Mn:0.05-0.2%, P≤0.015%; S≤0.01%; O≤0.0025%, N≤0.0025%, Al:0.015～0.050%; Ti:0.03 ∽ 0.07%, all the other are Fe and inevitable tramp element; In the said hot-rolled process, the Heating temperature of control continuous casting steel billet is 1080～1160 ℃, and in the said continuous annealing operation, controlled temperature is 710-740 ℃; In the said cold rolling process, control draft>=80%.
8. according to the said working method of claim 7; It is characterized in that in the said hot-rolled process; The intermediate blank of control after the roughing through the Coil Box rolling after again uncoiling get into 7 passage finish rolling; Control finish rolling start rolling temperature is 960 ℃～1020 ℃, and control finish rolling end temp is 900 ℃～950 ℃, and coiling temperature is 600 ℃～700 ℃ after the control finish rolling; In the said continuous annealing operation, the time of control soaking zone is 60～160s.
9. said according to Claim 8 working method is characterized in that also comprising the smooth operation in annealing back; In the said smooth operation, controlling smooth unit elongation is 0.3～1.2%.
10. according to claim 7,8 or 9 described working methods, the mass percentage content that it is characterized in that said C composition is 0.008～0.0015%, and the mass percentage content of said Mn composition is 0.08～0.15%; Said finish rolling end temp is 920 ℃, and coiling temperature is 680 ℃ after the said finish rolling, and said draft is 85%～90%;
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