CN108677089A - The preparation method of ultra low carbon steel slab - Google Patents
The preparation method of ultra low carbon steel slab Download PDFInfo
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- CN108677089A CN108677089A CN201810509729.XA CN201810509729A CN108677089A CN 108677089 A CN108677089 A CN 108677089A CN 201810509729 A CN201810509729 A CN 201810509729A CN 108677089 A CN108677089 A CN 108677089A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
The invention discloses a kind of preparation methods of ultra low carbon steel slab, belong to steel products production technical field.The present invention is in order to solve the grading performance control of different number plate ultra low carbon steel slabs in the prior art and with the technical problem of trade mark products of different specifications consistency of performance difference, provide a kind of preparation method of ultra low carbon steel slab, using steel-making → hot rolling → cooling → batch → acid rolls → continuous annealing → flattening process, by to DC03 and DC04 ultra low carbon steel slabs annealing process and flattening process grading control, and carry out annealing temperature and smooth elongation percentage gradient design by thickness specification, properties of product classification is set to become apparent from, it is more preferable with trade mark properties of product consistency, it is suitable for auto parts manufacture fully automatic high-speed punching press requirement, it promotes the use of and has good prospects.
Description
Technical field
The invention belongs to steel products production technical fields, and in particular to a kind of preparation method of ultra low carbon steel slab.
Background technology
With the fast development of Domestic Automotive Industry, the manufacture of white body part is also basic to realize full-automation.Especially
In punch forming part, domestic there are many formed using fully automatic high-speed punch forming.It is right in high speed stamping moulding process
More stringent requirements are proposed for the performance of material, is in particular in：When user material property is accurately controlled propose it is higher
It is required that；Second is that unanimously having requirements at the higher level with trade mark product different size performance.
For ultra low carbon steel slab, due to interstitial atoms such as C, N (usually requiring that C≤50ppm, N≤35ppm) in its ingredient
It is difficult to realize grading control, influence of the technique to end properties is also larger in addition.Therefore, ultra low carbon steel slab performance accurately controls
It is (grading control) and poor with trade mark products of different specifications consistency of performance, as DC03 and DC04 performance standards show two in table 1
Person's performance crossover is apparent, and very wide in range with trade mark performance range.This brings many difficulties to user's reasonable material, while also increasing
Added enterprise due to user's selection is improper and propose quality objection.
1 mechanical property of table
For technical barrier set forth above, current domestic and foreign literature and patent have no related solution.More
It is the optimal selection for the composition design and process choice and annealing process of a certain intensity rank ultra low carbon steel slab.
Invention content
First technical problem to be solved by this invention is to provide a kind of more obvious ultra low carbon steel slab system of grading performance
Preparation Method.
There is provided a kind of preparation sides of ultra low carbon steel slab for technical method used by the present invention solves above-mentioned technical problem
Method, using steel-making → hot rolling → cooling → batch → acid rolls → continuous annealing → flattening process, the chemistry of the ultra low carbon steel slab
Ingredient is by weight percentage：C：≤ 0.0035%, Si：0~0.02%, Mn：0.11~0.15%, Ti：0.050~
0.070%, N：≤ 0.0035%, P≤0.010%, S≤0.012%, Als：0.020~0.050%, remaining is Fe.
Wherein, in the preparation method of ultra low carbon steel slab described above, the trade mark of the ultra low carbon steel slab be DC03 and
DC04。
Wherein, in the preparation method of ultra low carbon steel slab described above, when preparing DC03 and DC04 ultra low carbon steel slabs, control
Finishing temperature and coiling temperature are respectively 910~950 DEG C and 720~760 DEG C in hot continuous rolling process.
Wherein, in the preparation method of ultra low carbon steel slab described above, when preparing DC03 and DC04 ultra low carbon steel slabs, control
It is 60%~85% that acid, which rolls cold rolling reduction ratio in process,.
Wherein, in the preparation method of ultra low carbon steel slab described above, when preparing DC03 and DC04 ultra low carbon steel slabs, cold rolling
Steel plate continuous annealing process section strip steel speed is 80~240m/min.
Wherein, in the preparation method of ultra low carbon steel slab described above, when preparing DC03 ultra low carbon steel slabs, cold-rolled steel sheet connects
Continuous annealing soak section temperature is 780~820 DEG C；When preparing DC04 ultra low carbon steel slabs, cold-rolled steel sheet continuous annealing soaking zone temperature
It is 810~850 DEG C.
Wherein, in the preparation method of ultra low carbon steel slab described above, when preparing DC03 ultra low carbon steel slabs, control is smooth to prolong
It is 0.5%~1.0% to stretch rate；When preparing DC04 ultra low carbon steel slabs, it is 0.3%~0.7% to control smooth elongation percentage.
Second technical problem to be solved by this invention is to provide a kind of yield strength fluctuation of above-mentioned ultra low carbon steel slab
Preparation method within 20MPa carries out annealing section soaking temperature and smooth extension by being directed to same trade mark different-thickness specification
The control of rate gradient is realized.
Wherein, in the preparation method of ultra low carbon steel slab described above, when preparing DC03 and DC04 ultra low carbon steel slabs, acid rolls
Strip different-thickness specification according to the form below carries out annealing process temperature gradient control afterwards：
Wherein, in the preparation method of ultra low carbon steel slab described above, the cooling velocity of slow cooling is 0.6~4 DEG C/s.
Wherein, in the preparation method of ultra low carbon steel slab described above, the cooling velocity of rapid cooling is 30~100 DEG C/s.
Wherein, in the preparation method of ultra low carbon steel slab described above, when preparing DC03 and DC04 ultra low carbon steel slabs, acid rolls
Strip different-thickness specification according to the form below carries out smooth elongation percentage gradient control afterwards：
The beneficial effects of the invention are as follows：
1, the method for the present invention is by DC03 and DC04 ultra low carbon steel slabs annealing process and flattening process grading control, realizing
DC03 and DC04 grading performances, DC03 average yield strengths, tensile strength, A80 elongation after fracture, r90 and n90 are respectively
140~160MPa, 295~305MPa, 41~43%, 2.2~2.4,0.23~0.24, DC04 average yield strengths, tension it is strong
Degree, A80 elongation after fracture, r90 and n90 are respectively 120~140MPa, 285~295MPa, 44~46%, 2.6~2.9,0.25
~0.26；
2, the method for the present invention is by carrying out annealing temperature by thickness specification to DC03 and DC04 ultra low carbon steel slabs and smooth prolonging
Stretch rate gradient design, realize DC03 and DC04 with trade mark properties of product stability contorting, the yield strength of DC03, tensile strength,
A80 elongation after fracture, r90 and n90 fluctuations are respectively 20MPa, 10MPa, 2%, 0.2, the yield strength of 0.01, DC04, tension
Intensity, A80 elongation after fracture, r90 and n90 fluctuations are respectively 20MPa, 10MPa, 2%, 0.3,0.01；
3, the properties of product classification that prepared by the method for the present invention becomes apparent from, more preferable with trade mark properties of product consistency, can more fit
It answers auto parts to manufacture fully automatic high-speed punching press requirement, promotes the use of and have good prospects.
Specific implementation mode
There is provided a kind of preparation sides of ultra low carbon steel slab for technical method used by the present invention solves above-mentioned technical problem
Method, using steel-making → hot rolling → cooling → batch → acid rolls → continuous annealing → flattening process, the chemistry of the ultra low carbon steel slab
Ingredient is by weight percentage：C：≤ 0.0035%, Si：0~0.02%, Mn：0.11~0.15%, Ti：0.050~
0.070%, N：≤ 0.0035%, P≤0.010%, S≤0.012%, Als：0.020~0.050%, remaining is Fe.
The method of the present invention is particularly useful for making the ultra low carbon steel slab that the trade mark is DC03 and DC04.It is super to prepare DC03 and DC04
When low carbon steel plate, the cold-rolled steel sheet hot continuous rolling process of two number plate ultra low carbon steel slabs (hot continuous rolling process include hot rolling → cooling →
Batch) unanimously, finishing temperature and coiling temperature are respectively 910~950 DEG C and 720~760 DEG C；Cold-rolled steel sheet pickling process
Cold-rolling process is consistent in (acid is rolled including pickling and cold rolling), and it is 60%~85% that control acid, which rolls cold rolling reduction ratio in process,.
When the method for the present invention prepares DC03 and DC04 ultra low carbon steel slabs, cold-rolled steel sheet continuous annealing process section strip steel speed is
80~240m/min.
More specifically, hot-rolled process：1220~1240 DEG C of slab tapping temperature, it is heating time, soaking time, total in stove
Time is respectively 100~150min, 50~80min, 150~230min.Through 5 passage roughing, it is rolled into base among 38~42mm.
For intermediate base through 7 rack hot continuous rollings at 3.25~6.0mm, finishing temperature is 910~950 DEG C, using section cooling to 720~
It is coiled after 760 DEG C.
Acid rolls process：Steel tape is formed after weld formation on sour rolling mill head by the sheet steel band of hot rolling, is passed through
Continuous rolling is carried out after crossing aligning, pickling, alkali cleaning, drying, trimming, cold mill complex, which can be used, may be used various conventional cold companies
Milling train group, such as 4-5 Stands Cold Tandem Mill groups, steel plate is reduced to annealing unit raw thickness through sour outgoing gauge, controls cold rolling
Lower rate is 60%~85%.The acid rolls step and may be used that well known to a person skilled in the art methods and techniques.
Continuous annealing and smooth process：Sheet steel band after peracid rolls forms continuously after weld formation in continuous annealing unit entrance
Steel band carries out continuous annealing, the method that cleaning process is known to the skilled person after surface continuous wash, drying.
Annealing operation is continuous annealing mode, and the annealed unit of steel band preheated, recrystallization annealing and soaking, primary cooling, quickly
Cooling, Wetted constructures, the eventually smooth, bundling of cold rear progress.Crucial annealing process and smooth work in continuous annealing and smooth process
Skill parameter is controlled by the parameter request that the method for the present invention provides；The time for controlling the soaking stage is 55~165s, and strip is got over
Thin, the speed of service is faster, and the time used is shorter, and the cooling velocity of slow cooling is 0.6~4 DEG C/s, and the cooling velocity of rapid cooling is 30~
100 DEG C/s, the time in overaging stage is 240~720s.
In order to realize that DC03 and DC04 grading performances become apparent from, when preparing DC03 ultra low carbon steel slabs, cold-rolled steel sheet continuously moves back
Fiery soaking zone temperature is 780~820 DEG C, and it is 0.5%~1.0% to control smooth elongation percentage；It is cold when preparing DC04 ultra low carbon steel slabs
Rolled steel plate continuous annealing soaking zone temperature is 810~850 DEG C, and it is 0.3%~0.7% to control smooth elongation percentage.
In addition to realizing the grading performance between DC03 and DC04, it is also necessary to it realizes with trade mark properties of product consistency, therefore this
Invention has also carried out annealing section soaking temperature to same trade mark different-thickness specification and smooth elongation percentage gradient controls, ultralow to make
The yield strength of carbon steel sheet fluctuates the preparation method within 20MPa.
On the basis of the preparation method of ultra low carbon steel slab described above, when preparing DC03 and DC04 ultra low carbon steel slabs,
To further being controlled for same trade mark different-thickness specification.
Wherein, acid rolls rear strip different-thickness specification by the progress annealing process temperature gradient control of table 2：
2 annealing process temperature gradient of table
Acid rolls rear strip different-thickness specification and carries out smooth elongation percentage gradient control by table 3：
3 smooth elongation percentage gradient of table
The method of the present invention is by DC03 and DC04 ultra low carbon steel slabs annealing process and flattening process grading control, realizing
DC03 and DC04 grading performances, DC03 average yield strengths, tensile strength, A80 elongation after fracture, r90 and n90 are respectively 140
~160MPa, 295~305MPa, 41~43%, 2.2~2.4,0.23~0.24, DC04 average yield strengths, tensile strength,
A80 elongation after fracture, r90 and n90 be respectively 120~140MPa, 285~295MPa, 44~46%, 2.6~2.9,0.25~
0.26；Annealing soak temperature further is carried out by thickness specification to DC03 and DC04 ultra low carbon steel slabs and smooth elongation percentage gradient is set
Meter, realizes DC03 and DC04 with trade mark properties of product stability contorting, and the yield strength of DC03, tensile strength, A80 have no progeny elongation
Rate, r90 and n90 fluctuations respectively 20MPa, 10MPa, 2%, 0.2, the yield strength of 0.01, DC03, tensile strength, A80 have no progeny
Elongation, r90 and n90 fluctuations are respectively 20MPa, 10MPa, 2%, 0.3,0.01；With the same level of conventional continuous annealing process production
Cold rolling ultra low carbon steel slab is compared, and the classification of this technology properties of product becomes apparent from, more preferable with trade mark properties of product consistency, is suitable for
Auto parts manufacture fully automatic high-speed punching press requirement, promote the use of and have good prospects.
Below by embodiment, invention is further described in detail, but does not therefore limit the scope of the present invention
Among the embodiment described range.
Embodiment 1
A, steel-making ingredient (mass percent, %)：C：0.0020、Si：0.01、Mn：0.13、Ti：0.062、N：0.0018、
P：0.008、S：0.005、Als：0.032, remaining is Fe.
B, hot rolling：Slab heating time, soaking time in stove total time are respectively 120min, 60min, 180min, tapping
1227 DEG C of temperature；Through 5 passage roughing, it is rolled into base among 39mm.Intermediate base is through 7 rack hot continuous rollings at 3.75mm, finish to gauge temperature
Degree is 932 DEG C, using section cooling to coiled after 745 DEG C.
C, acid rolls：Routinely technique pickling, using 5 rack cold continuous rollings, cold rolling reduction ratio is 81.3%, and outgoing gauge is
0.7mm。
D, continuous annealing：Strip is after conventional alkali cleaning, scrub, electrolytic cleaned, rinsing, extracting, into continuous annealing furnace, stove
Interior strip speed is 200m/min, soaking 66s after being heated to 786 DEG C, and 668 DEG C of (slow cooling terminal temperature are cooled to 3.6 DEG C/s
Degree) after, be cooled fast to 434 (rapid cooling outlet temperatures) DEG C through 80 DEG C/s, then after 411 DEG C of Wetted constructures 244s water quenching to room
Temperature.Enter planisher after extracting, smooth to use elongation control pattern, average smooth elongation control is 0.55%, finally
In rolls, packaging and storage.
The DC03 finished product mechanical properties of acquisition are shown in Table 4.
Embodiment 2
Preparation method is same as Example 1, the difference is that the molten steel composition that converter smelting obtains is C：0.0032、Si：
0.01、Mn：0.11、Ti：0.068、N：0.0022、P：0.010、S：0.006、Als：0.035, remaining is Fe, (Wt, %).And
The hot rolled steel plate produced with aforementioned molten steel, 1220 DEG C of slab tapping temperature, finishing temperature are 927 DEG C, and coiling temperature is 725 DEG C,
Hot rolled thickness 4.50mm, acid roll thickness 1.0mm；The speed of service is 180m/min in strip steel furnace, and annealing soak temperature is 792 DEG C,
Soaking time is 73s, and slow cooling terminal is 674 DEG C, 408 DEG C of overaging section temperature, smooth elongation percentage 0.78%.
The DC03 finished product mechanical properties of acquisition are shown in Table 4.
Embodiment 3
Preparation method is same as Example 1, the difference is that the molten steel composition that converter smelting obtains is C：0.0017、Si：
0.02、Mn：0.14、Ti：0.062、N：0.0025、P：0.007、S：0.004、Als：0.041, remaining is Fe, (Wt, %).And
The hot rolled steel plate produced with aforementioned molten steel, 1231 DEG C of slab tapping temperature, finishing temperature are 936 DEG C, and coiling temperature is 746 DEG C,
Hot rolled thickness 5.50mm, acid roll thickness 1.5mm；The speed of service is 120m/min in strip steel furnace, and annealing soak temperature is 805 DEG C,
Soaking time is 110s, and slow cooling terminal is 678 DEG C, 416 DEG C of overaging section temperature, smooth elongation percentage 0.84%.
The DC03 finished product mechanical properties of acquisition are shown in Table 4.
Embodiment 4
Preparation method is same as Example 1, the difference is that the molten steel composition that converter smelting obtains is C：0.0032、Si：
0.01、Mn：0.11、Ti：0.067、N：0.0016、P：0.007、S：0.004、Als：0.043, remaining is Fe, (Wt, %).And
The hot rolled steel plate produced with aforementioned molten steel, 1237 DEG C of slab tapping temperature, finishing temperature are 941 DEG C, and coiling temperature is 752 DEG C,
Hot rolled thickness 6.0mm, acid roll thickness 2.0mm；The speed of service is 90m/min in strip steel furnace, and annealing soak temperature is 814 DEG C,
The hot time is 147s, and slow cooling terminal is 680 DEG C, 409 DEG C of overaging section temperature, smooth elongation percentage 0.92%.
The DC03 finished product mechanical properties of acquisition are shown in Table 4.
Embodiment 5
Preparation method is substantially the same manner as Example 1, the difference is that acid rolls thickness 0.7mm, annealing soak temperature is 823 DEG C,
Smooth elongation percentage is 0.38%.The DC04 finished product mechanical properties of acquisition are shown in Table 4.
Embodiment 6
Preparation method is substantially the same manner as Example 2, the difference is that acid rolls thickness 1.0mm, annealing soak temperature is 820 DEG C,
Smooth elongation percentage is 0.53%.The DC04 finished product mechanical properties of acquisition are shown in Table 4.
Embodiment 7
Preparation method is substantially the same manner as Example 3, the difference is that acid rolls thickness 1.5mm, annealing soak temperature is 837 DEG C,
Smooth elongation percentage is 0.55%.The DC04 finished product mechanical properties of acquisition are shown in Table 4.
Embodiment 8
Preparation method is same as Example 4, the difference is that acid rolls thickness 2.0mm, annealing soak temperature is 844 DEG C, smooth
Elongation percentage is 0.63%.The DC04 finished product mechanical properties of acquisition are shown in Table 4.
4 Examples 1 to 8 end properties of table
By Examples 1 to 8 it is found that DC03 the and DC04 ultra low carbon steel slab properties of product classification that the method for the present invention is prepared
It becomes apparent from, it is more preferable with trade mark properties of product consistency, it is suitable for auto parts manufacture fully automatic high-speed punching press requirement, popularization makes
With having good prospects.
Claims (10)
1. the preparation method of ultra low carbon steel slab, using steel-making → hot rolling → cooling → batch → acid rolls → continuous annealing → smooth work
Skill, it is characterised in that：The chemical composition comprises the following components in percentage by weight of the ultra low carbon steel slab is：C：≤ 0.0035%, Si：0~
0.02%, Mn：0.11~0.15%, Ti：0.050~0.070%, N：≤ 0.0035%, P≤0.010%, S≤0.012%,
Als：0.020~0.050%, remaining is Fe.
2. the preparation method of ultra low carbon steel slab according to claim 1, it is characterised in that：The trade mark of the ultra low carbon steel slab
For DC03 and DC04.
3. the preparation method of ultra low carbon steel slab according to claim 2, it is characterised in that：Prepare DC03 and DC04 Ultra-low carbons
When steel plate, it is respectively 910~950 DEG C and 720~760 DEG C to control finishing temperature and coiling temperature in hot continuous rolling process.
4. the preparation method of ultra low carbon steel slab according to claim 2, it is characterised in that：Prepare DC03 and DC04 Ultra-low carbons
When steel plate, it is 60%~85% that control acid, which rolls cold rolling reduction ratio in process,.
5. the preparation method of ultra low carbon steel slab according to claim 2, it is characterised in that：Prepare DC03 and DC04 Ultra-low carbons
When steel plate, cold-rolled steel sheet continuous annealing process section strip steel speed is 80~240m/min.
6. the preparation method of ultra low carbon steel slab according to claim 2, it is characterised in that：Prepare DC03 ultra low carbon steel slabs
When, cold-rolled steel sheet continuous annealing soaking zone temperature is 780~820 DEG C；When preparing DC04 ultra low carbon steel slabs, cold-rolled steel sheet continuously moves back
Fiery soaking zone temperature is 810~850 DEG C.
7. the preparation method of ultra low carbon steel slab according to claim 2, it is characterised in that：Prepare DC03 ultra low carbon steel slabs
When, it is 0.5%~1.0% to control smooth elongation percentage；Prepare DC04 ultra low carbon steel slabs when, control smooth elongation percentage be 0.3%~
0.7%.
8. the preparation method of ultra low carbon steel slab according to claim 6, it is characterised in that：Prepare DC03 and DC04 Ultra-low carbons
When steel plate, acid rolls rear strip different-thickness specification according to the form below and carries out annealing process temperature gradient control：
9. the preparation method of ultra low carbon steel slab according to claim 8, it is characterised in that：The cooling velocity of slow cooling is 0.6
~4 DEG C/s；The cooling velocity of rapid cooling is 30~100 DEG C/s.
10. the preparation method of ultra low carbon steel slab according to claim 7, it is characterised in that：It is ultralow to prepare DC03 and DC04
When carbon steel sheet, acid rolls rear strip different-thickness specification according to the form below and carries out smooth elongation percentage gradient control：
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| CN109988969B (en) * | 2019-04-01 | 2021-09-14 | 山东钢铁集团日照有限公司 | Cold-rolled Q & P1180 steel with different yield ratios and production method thereof |
| CN113667895A (en) * | 2021-08-19 | 2021-11-19 | 安钢集团冷轧有限责任公司 | Method for eliminating tensile strain marks of cold-rolled sheet for stamping |
| CN113667895B (en) * | 2021-08-19 | 2023-01-20 | 安钢集团冷轧有限责任公司 | Method for eliminating tensile strain marks of cold-rolled sheet for stamping |
| CN114525449A (en) * | 2022-01-28 | 2022-05-24 | 包头钢铁（集团）有限责任公司 | DC04 automobile steel plate for cold rolling deep drawing and manufacturing method thereof |
| CN114959419A (en) * | 2022-05-27 | 2022-08-30 | 包头钢铁（集团）有限责任公司 | Production method of low-yield-ratio cold-rolled deep-drawing thick steel strip DC03 |
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Application publication date: 20181019 |