CN105274301B - A kind of production method of yield strength >=220MPa galvanneal steel plates - Google Patents
A kind of production method of yield strength >=220MPa galvanneal steel plates Download PDFInfo
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- CN105274301B CN105274301B CN201510764471.4A CN201510764471A CN105274301B CN 105274301 B CN105274301 B CN 105274301B CN 201510764471 A CN201510764471 A CN 201510764471A CN 105274301 B CN105274301 B CN 105274301B
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Abstract
A kind of production method of yield strength >=220MPa galvanneal steel plates：Through desulfurizing iron, converter smelting and it is casting continuously to form base；Carry out hot rolling；Batch；It is cold-rolled to required thickness；Continuous hot galvanizing；Quick cooling；Cooled down after Zn-Fe alloying using aerosol；Finishing；Apply oil processing；Sampling, performance test and subsequent handling processing.The present invention is ensureing that yield strength is 220MPa~260MPa, tensile strength is 300 MPa~380MPa, on the premise of elongation >=43%, zn-fe alloy coating surface microstructure is tiny, size distribution uniformly, coating surface hole occupied area ratio≤5%, surface it is non-microcracked, coating is less prone to dusting and obscission when stamping, i.e. the curved test gradings of 90 ° of V are up to 2 grades.
Description
Technical field
The present invention relates to a kind of production method of galvanized steel plain sheet, specifically belongs to a kind of yield strength >=220MPa iron zinc and closes
The production method of gold plate steel plate.
Background technology
Zn-fe alloy coating steel plate due to excellent corrosion resistance, coating, weldability and anti-chad impact performance,
It is widely used in car panel.However, current zinc-iron alloy surface plating structure is since compactness is poor, coating surface group
Knit thick, grain size skewness and there is obvious micro-crack on surface, when stamping, coming off for coating easily occur
With dusting, so as to cause punching parts surface quality undesirable, it is impossible to meet user's needs.
Through preliminary search：Open report《A kind of high-strength galvannealed sheet of steels excellent in powdering resistance》, its
Formed using following：At least there is Fe-Zn alloy layers in the one side of former material steel plate, from the surface of the coating to plating layer depth
Direction is spent with more than 300 thickness, and there are the region of Al (atom %)/Zn (atom %) >=0.10, and disclosure is as needed, passes through
Specific former material steel plate chemical composition composition and tissue so that processability it is also preferred that alloy galvanized steel plate[1].Close
The aurification zinc plated plate plated layer mechanism study that comes off analyzes the microcosmos structure characteristic of alloying hot dip galvanized sheet coating, based on coating material first
Expect brittleness multilayer feature, analyze the stress-strain state of coating under the conditions of complex deformation, by the failure criteria of laminate and
Fragile material strain energy density S factors failure criteria is applied to coating material, proposes that monolayer material is destroyed and is mutually tied with crack propagation
Conjunction is the main reason for coating material comes off[9].To solve the platability of high-strength steel proof strength at the same time, this paper presents one kind
New dual phase steel hot dip galvanizing process, i.e.,：Feeding → uncoiling cleaning → two-phase section annealing → slow cooling and water quenching → pickling → reheating
→ zinc-plated (and/or alloying) → cooling is → smooth → is post-processed and batched, wherein, quickly cooled down using water quenching and first complete horse
Family name's body phase transformation, carries out pickling, on the one hand removes surface of steel plate iron scale, on the other hand can wash away surface enrichment afterwards
Then the alloying elements such as Mn, Si are heated to 460 DEG C or so galvanizings and/or alloying annealing to improve platability.Due to adopting
With galvanizing after phase transformation, which, which is changed into through hardening sex chromosome mosaicism when improving Galvanized Dual Phase Steel annealing cooling, improves dual phase steel again
The temper resistance problem of martensitic structure during heating galvanizing[12].Antimony in galvanizing bath has been inquired into using zinc-plated simulator（Sb）Contain
Amount, the influence of steel surface roughness and cooldown rate to metallic zinc Coating.Steel surface roughness is divided into phase
To coarse and two kinds of relative smooth, the scope of cooldown rate is 0.1-10K/s, and the scope of Sb is 0-0.1wt% in galvanizing bath.It is logical
Often, with the increase of Sb contents in galvanizing bath, crystallite dimension gradually increases in coating, and in the direction parallel to surface of steel plate
Upper formation { 0002 } crystal face.Increase steel surface roughness can reduce coating crystallite dimension and promote to form more unordered coating
Crystal structure, when Sb contents are 0.1wt% in galvanizing bath, when cooldown rate is 10K/s, steel surface roughness is to crystallite dimension
Influence not notable.Increase cooldown rate is conducive to reduce coating crystallite dimension, and promotes the growth in { 0002 } direction[19].This article
The influence for being the zinc-plated postcooling speed of research to steel surface roughness is offered, its maximum cooling velocity is only 10K/s, to coating knot
Structure compactness improves limited.Another document discloses《A kind of method for manufacturing high strength galvanized steel plate》, it includes hot rolling shape
Into a steel plate；During continuous annealing, steel plate is heated between 750 DEG C to 900 DEG C.500 DEG C to A1 transition temperatures it
Between average heating rate at least 10 °C/s；Keep this temperature at least 10s；Steel plate is cold from 750 DEG C with the cooldown rate of 10 °C/s
But arrive（- 100 DEG C of Ms points）Arrive（- 200 DEG C of Ms points）；Steel plate recrystallization temperature is 350 DEG C to 600 DEG C；This temperature 10s is kept to arrive
600s；By galvanized steel.The document is influence of the zinc-plated postcooling speed of research to steel surface roughness, its cooling velocity is most
It is only 10K/s greatly, coating structure compactness is improved limited.
The content of the invention
The present invention is in view of the deficienciess of the prior art, provide a kind of on the premise of ensureing that it uses mechanical property, zinc
Iron-zinc alloy coating surface microstructure is tiny, size distribution uniformly, coating surface hole occupied area ratio≤5%, surface it is non-microcracked,
Coating is less prone to the production of yield strength >=220MPa galvanneal steel plates of dusting and obscission when stamping
Method.
Realize the measure of above-mentioned purpose：
A kind of production method of yield strength >=220MPa galvanneal steel plates, its step：
1）Through desulfurizing iron, converter smelting and it is casting continuously to form base；
2）Carry out hot rolling, and control roughing rolling temperature at 1020~1060 DEG C, control finish rolling finishing temperature 860~
890℃；3）Batched, control coiling temperature is at 650~700 DEG C；
4）Carry out cold rolling and be rolled to required thickness；
5）Continuous hot galvanizing is carried out, and controls unit speed zinc liquid temperature is at 457~463 DEG C in 100~130m/min；
6）Carry out it is zinc-plated after quick cooling：Cooled down in uplink section using aerosol, it is cold under 40~60 DEG C/s of cooling velocity
But to 470~490 DEG C；
7）After Zn-Fe alloying is carried out, cooled down using aerosol, its cooling velocity is controlled in 30~50 DEG C/s；
8）Finishing is carried out, and finishing elongation control is 0.1~0.7%；
9）Carry out painting oil processing, control upper and lower oil surface amount it is each≤35g/m2；
10）Sampling, performance test and subsequent handling processing.
The present invention is surpassed in uplink section after galvanized steel goes out zinc pot using aerosol according to 40~60 DEG C/s of cooling velocity
Quick cooling, the zinc liquid for being to adhere to surface of steel plate quickly solidifies, by increasing nucleation rate, so that it is fully thin to obtain crystal grain
Change, size distribution is uniform, coating structure is fine and close and the initial pure zinc coating tissue of ideal of the surface without obvious micro-crack defect.
Why on the basis of preferable initial pure zinc coating tissue, then cooled down after alloying using aerosol, and according to
30~50 DEG C/s of cooling velocity carries out ultra-rapid cooling, with the length of each zinc-iron alloy mutually at high temperature in alloy layer is prevented
Greatly, finally to obtain, galvanneal coating surface texture is tiny, grain size distribution is uniform, coating structure is fine and close and surface is without obvious
The preferable zn-fe alloy coating tissue of micro-crack defect.
Compared with prior art, the present invention ensureing that yield strength is 220MPa~260MPa, tensile strength is 300 MPa
~380MPa, on the premise of elongation >=43%, zn-fe alloy coating surface microstructure is tiny, size distribution uniformly, coating surface hole
Hole occupied area ratio≤5%, surface are non-microcracked, and coating is less prone to dusting and obscission, i.e. 90 ° of curved surveys of V when stamping
Examination grading is up to 2 grades.
Brief description of the drawings
Attached drawing is zn-fe alloy coating steel plate coating surface topography map in surface of the present invention.
Embodiment
The present invention is described in detail below：
Table 1 is various embodiments of the present invention and the main technologic parameters list of comparative example；
Table 2 is the performance test results list of various embodiments of the present invention and comparative example.
Various embodiments of the present invention follow the steps below production：
1）Through desulfurizing iron, converter smelting and it is casting continuously to form base；
2）Carry out hot rolling, and control roughing rolling temperature at 1020~1060 DEG C, control finish rolling finishing temperature 860~
890℃；3）Batched, control coiling temperature is at 650~700 DEG C；
4）Carry out cold rolling and be rolled to required thickness；
5）Continuous hot galvanizing is carried out, and controls unit speed zinc liquid temperature is at 457~463 DEG C in 100~130m/min；
6）Carry out it is zinc-plated after quick cooling：Cooled down in uplink section using aerosol, it is cold under 40~60 DEG C/s of cooling velocity
But to 470~490 DEG C；
7）After Zn-Fe alloying is carried out, cooled down using aerosol, its cooling velocity is controlled in 30~50 DEG C/s；
8）Finishing is carried out, and finishing elongation control is 0.1~0.7%；
9）Carry out painting oil processing, control upper and lower oil surface amount it is each≤35g/m2；
10）Sampling, performance test and subsequent handling processing.
The main technologic parameters list of 1 various embodiments of the present invention of table and comparative example
The performance test results list of 2 various embodiments of the present invention of table and comparative example
From table 2 it can be seen that institute's case study on implementation excellent in mechanical performance, yield strength, tensile strength and elongation percentage are satisfied by
Corresponding requirements, especially hole occupied area are than being respectively less than 5%, and the corresponding curved dusting gradings of V are again smaller than 2 grades.But comparative example
Although the 1,2 tensile property all meets index request, its hole occupied area ratio is all higher than 7%, the corresponding curved dusting gradings of V
Again smaller than 3 grades.
It will be seen from figure 1 that zn-fe alloy coating of the yield strength of the ultrafast cold technique productions in more than 220MPa is high
Strong steel plate coating surface texture has obtained sufficient refinement, and grain size is evenly distributed, and coating structure is fine and close, hole institute
Area ratio≤5% is accounted for, without obvious micro-crack defect, coating possesses suitable intensity and plasticity on surface, and finishing rear surface shows
Obvious finishing impression.Based on this, the yield strength of production more than 220MPa zn-fe alloy coating high strength steel plate it is anti-
Powder performance is good, and as shown in table 2, it is 2 grades to implement five cases, 90 ° of curved test results of V, and product is rushed corresponding part
Do not occur obvious dusting and obscission during pressing formation.
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.
Claims (3)
1. a kind of production method of yield strength >=220MPa galvanneal steel plates, its step：
1）Through desulfurizing iron, converter smelting and it is casting continuously to form base；
2）Hot rolling is carried out, and controls roughing rolling temperature at 1045 DEG C, control finish rolling finishing temperature is at 880 DEG C；
3）Batched, control coiling temperature is at 675 DEG C；
4）Carry out cold rolling and be rolled to required thickness；
5）Continuous hot galvanizing is carried out, and controls unit speed zinc liquid temperature is at 460 DEG C in 100~130m/min；
6）Carry out it is zinc-plated after quick cooling：Cooled down in uplink section using aerosol, it is cooled to 470 under 43 DEG C/s of cooling velocity~
490℃；
7）After Zn-Fe alloying is carried out, cooled down using aerosol, its cooling velocity is controlled in 38 DEG C/s；
8）Finishing is carried out, and finishing elongation control is 0.5%；
9）Painting oil processing is carried out, controls upper and lower oil surface amount respectively in 30g/m2；
10）Sampling, performance test and subsequent handling processing.
2. a kind of production method of yield strength >=220MPa galvanneal steel plates, its step：
1）Through desulfurizing iron, converter smelting and it is casting continuously to form base；
2）Hot rolling is carried out, and controls roughing rolling temperature at 1035 DEG C, control finish rolling finishing temperature is at 885 DEG C；
3）Batched, control coiling temperature is at 680 DEG C；
4）Carry out cold rolling and be rolled to required thickness；
5）Continuous hot galvanizing is carried out, and controls unit speed zinc liquid temperature is at 461 DEG C in 100~130m/min；
6）Carry out it is zinc-plated after quick cooling：Cooled down in uplink section using aerosol, it is cooled to 470 under 44 DEG C/s of cooling velocity~
490℃；
7）After Zn-Fe alloying is carried out, cooled down using aerosol, its cooling velocity is controlled in 39 DEG C/s；
8）Finishing is carried out, and finishing elongation control is 0.4%；
9）Painting oil processing is carried out, controls upper and lower oil surface amount respectively in 30g/m2；
10）Sampling, performance test and subsequent handling processing.
3. a kind of production method of yield strength >=220MPa galvanneal steel plates, its step：
1）Through desulfurizing iron, converter smelting and it is casting continuously to form base；
2）Hot rolling is carried out, and controls roughing rolling temperature at 1049 DEG C, control finish rolling finishing temperature is at 880 DEG C；
3）Batched, control coiling temperature is at 675 DEG C；
4）Carry out cold rolling and be rolled to required thickness；
5）Continuous hot galvanizing is carried out, and controls unit speed zinc liquid temperature is at 460 DEG C in 100~130m/min；
6）Carry out it is zinc-plated after quick cooling：Cooled down in uplink section using aerosol, it is cooled to 470 under 48 DEG C/s of cooling velocity~
490℃；
7）After Zn-Fe alloying is carried out, cooled down using aerosol, its cooling velocity is controlled in 39 DEG C/s；
8）Finishing is carried out, and finishing elongation control is 0.4%；
9）Painting oil processing is carried out, controls upper and lower oil surface amount respectively in 33g/m2；
10）Sampling, performance test and subsequent handling processing.
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| CN103882202B (en) * | 2012-12-20 | 2016-03-30 | 上海梅山钢铁股份有限公司 | The manufacture method of the high-strength hot-galvanized steel of a kind of continuous annealing |
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Effective date of registration: 20171107 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Applicant after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Applicant before: Wuhan Iron & Steel (Group) Corp. |
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