CN106755867B - A kind of hot dip galvanized dual phase steel surface treatment method - Google Patents
A kind of hot dip galvanized dual phase steel surface treatment method Download PDFInfo
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- CN106755867B CN106755867B CN201611093104.7A CN201611093104A CN106755867B CN 106755867 B CN106755867 B CN 106755867B CN 201611093104 A CN201611093104 A CN 201611093104A CN 106755867 B CN106755867 B CN 106755867B
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- Prior art keywords
- dual phase
- phase steel
- steel plate
- dip galvanized
- hot dip
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- 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
- C21D8/0236—Cold rolling
-
- 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
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
Abstract
The invention discloses a kind of hot dip galvanized dual phase steel surface treatment methods, belong to dual phase steel rolling technical field.For the hot dip galvanized dual phase steel surface treatment method the following steps are included: heating to dual phase steel plate, heating cycle is low temperature fast firing；Roughing and finish rolling are carried out to the dual phase steel plate after heating；Cold rolling is carried out to the dual phase steel plate after finish rolling, cold rolling reduction ratio is 50-60%.Hot dip galvanized dual phase steel surface treatment method of the present invention, which can control cold rolling plate surface superficial layer and roll, to be split and the formation of surface layer burr, to control multiple spot plating leakage, the zinc layers unevenness that the substrate with surface layer crackle and burr generates in hot galvanizing process, the generation of macroscopical mountain peak line is reduced.
Description
Technical field
The present invention relates to dual phase steel rolling technical field, in particular to a kind of hot dip galvanized dual phase steel surface treatment method.
Background technique
Dual phase steel is strong in the ferrite that tough martensite is introduced into high ductility using composite material concept as design concept
Change, the double steel steel of this special organization decided because it has low yield tensile ratio, higher work hardening capacity and good plasticity,
The development for meeting automotive material lightweight high-performance safety environment protecting energy saving simultaneously, is widely used in automobile structure and reinforcer.
With the development of Automobile Plate, high-strength steel is also gradually applied to the part of viewing position, therefore high-strength steel is in addition to needing to meet safety
Outside property demand, surface quality also faces increasingly higher demands.Comprehensively consider intensity and bending performance, ingredient introduces when designing
The alloys such as Nb devise the dual phase steel galvanized sheet for meeting the 600MPa rank of properties.But take place frequently mountain peak in process of production
Shape chromatic aberration defect while influencing beauty, also results in influence to the subsequent use of client.There are decarburization, crackle through analytic substrate surface layer
And crackle raise after burr, be that these defects of substrate result in that plating leakage, zinc layers are uneven, and macroscopic view forms mountain peak line color difference and lacks
It falls into.
Traditional hot dip galvanized dual phase steel design, the influence of the elements to hot galvanizing process platability such as general only consideration Si, and
The optimization of zincincation.In actual production process, lower Si element, reasonable zincincation still cannot obtain good table
Face, mountain peak line defect have seriously affected the surface quality of hot dip galvanized dual phase steel.
Summary of the invention
The present invention provides a kind of hot dip galvanized dual phase steel surface treatment method, solve or part solve in the prior art compared with
Low Si element, reasonable zincincation cannot obtain good surface, after substrate surface layer has decarburization, crackle and crackle to raise
Burr, be that these defects of substrate result in the technical issues of plating leakage, zinc layers are uneven, and macroscopic view forms mountain peak line chromatic aberration defect.
In order to solve the above technical problems, the present invention provides a kind of elimination sides of hot dip galvanized dual phase steel surface mountain peak line defect
Method, the hot dip galvanized dual phase steel for being 600MPa or more for intensity rank；It the treating method comprises following steps: to dual phase sheet steel
Material is heated, and the heating cycle is low temperature fast firing；Roughing and finish rolling are carried out to the dual phase steel plate after heating；
Cold rolling is carried out to the dual phase steel plate after finish rolling, the cold rolling reduction ratio is 50-60%.
Further, it is 180- that the heating cycle, which is total heating time that low temperature fast firing includes: the dual phase steel plate,
230min。
Further, it is 35- that the heating cycle, which is the soaking zone time that low temperature fast firing includes: the dual phase steel plate,
45min。
Further, it is 1180- that the heating cycle, which is the tapping temperature that low temperature fast firing includes: the dual phase steel plate,
1220℃。
Further, the dual phase steel slab after described pair of heating carries out the essence that finish rolling includes: the dual phase steel plate
Rolling inlet temperature is 990-1020 DEG C.
Hot dip galvanized dual phase steel surface treatment method provided by the invention heats dual phase steel plate, heating cycle
For low temperature fast firing, superficial oxidation thickness of scale on the one hand can control, prevent iron sheet from remaining Hard Inclusion, on the other hand can control
Superficial decarbonization prevents the coarse matter of surface layer grain soft, carries out roughing and finish rolling to the dual phase steel plate after heating, to double after finish rolling
Phase steel board carries out cold rolling, and cold rolling reduction ratio reduces the accumulation of surface layer strain, it is cold to control hot dip galvanized dual phase steel in 50-60%
It rolls plate surface superficial layer and rolls and split and the formation of surface layer burr, so that substrate of the control with surface layer crackle and burr is in hot galvanizing
The multiple spot plating leakage generated in journey, zinc layers are uneven, reduce the generation of macroscopical mountain peak line.
Detailed description of the invention
Fig. 1 is the flow diagram of hot dip galvanized dual phase steel surface treatment method provided in an embodiment of the present invention.
Specific embodiment
Referring to Fig. 1, a kind of hot dip galvanized dual phase steel surface treatment method provided in an embodiment of the present invention is for intensity rank
The hot dip galvanized dual phase steel of 600MPa or more；It the treating method comprises following steps:
Step 1, the dual phase steel slab is heated, the heating cycle is low temperature fast firing.
Step 2, roughing and finish rolling are carried out to the dual phase steel slab after heating.
Step 3, cold rolling is carried out to the dual phase steel slab after finish rolling, the cold rolling reduction ratio is below 60%.
Technical solution of the present invention is directed to the hot dip galvanized dual phase steel that intensity rank is 600MPa or more, by dual phase sheet steel
Base is heated, and heating cycle is low temperature fast firing, on the one hand be can control superficial oxidation thickness of scale, is prevented iron sheet from remaining
On the other hand Hard Inclusion can control superficial decarbonization, prevent the coarse matter of surface layer grain soft, carry out to the dual phase steel plate after heating
Roughing and finish rolling carry out cold rolling to the dual phase steel plate after finish rolling, and cold rolling reduction ratio reduces the product of surface layer strain in 50-60%
It is tired, it controls hot dip galvanized dual phase steel cold rolling plate surface superficial layer and rolls and split and the formation of surface layer burr, so that control has surface check
The multiple spot plating leakage that the substrate of line and burr generates in hot galvanizing process, zinc layers are uneven, reduce the generation of macroscopical mountain peak line.
Step 1 is discussed in detail.
It is 180-230min that the heating cycle, which is total heating time that low temperature fast firing includes: the dual phase steel slab, institute
The soaking zone time for stating dual phase steel slab is 35-45min, and the tapping temperature of the dual phase steel slab is 1180-1220 DEG C, a side
Face can control superficial oxidation thickness of scale, prevents iron sheet from remaining Hard Inclusion, on the other hand can control superficial decarbonization, prevent table
Layer coarse grains matter is soft, improves surface layer anti-crack ability.
Step 2 is discussed in detail.
Dual phase steel slab progress roughing and finish rolling after described pair of heating include: that the finish rolling of the dual phase steel slab enters
Mouth temperature is 990-1020 DEG C.Early-stage study finds that lower smart de-scaling temperature is conducive to the scale removal effect of dual phase steel, reduces iron
Skin residual, while the superficial decarbonization during high temperature rolling is controlled, reduction, which is rolled, splits risk, passes through the finish rolling to dual phase steel slab
Inlet temperature control can optimize smart scale removal effect and reduce iron sheet residual, reduce operation of rolling superficial decarbonization.
The embodiment of the present invention is introduced in order to become apparent from, is introduced from the application method of the embodiment of the present invention below.
Provide the production instance of 780MPa rank hot dip galvanized dual phase steel.
Firstly, heating to dual phase steel slab, processing low temperature is fast burning heating cycle, on the one hand can control surface layer oxygen
Change thickness of scale, prevent iron sheet from remaining Hard Inclusion, on the other hand can control superficial decarbonization, prevent the coarse matter of surface layer grain soft,
Improve surface layer anti-crack ability.
The crucial heating technique parameter of table 1
| Technique | Slab total heating time | The soaking zone time | Tapping temperature |
| Parameter | 200min | 45min | 1218℃ |
Roughing and finish rolling are carried out to the dual phase steel slab after heating, control entry temperature at finishing, the essence of base among dual phase steel
Rolling inlet temperature is 990-1020 DEG C, guarantees each link de-scaling pressure.Entry temperature at finishing control in the actual production process exists
1010 DEG C or so, each link de-scaling pressure control is stablized, and is optimized smart scale removal effect and is reduced iron sheet residual, while controlling high warm-rolling
Superficial decarbonization during system, reduction, which is rolled, splits risk.
In the operation of rolling, surface deformation amount is maximum, and center portion deflection is minimum, and strict control cold rolling reduction ratio can reduce
The accumulation of surface layer strain, reduction, which is rolled, splits risk.Cold rolling is carried out to the dual phase steel slab after finish rolling, cold rolling reduction ratio is in 50-
60%, reduce the accumulation of surface layer strain, reduction, which is rolled, splits risk.
2 cold rolling Soft Reduction Gradient of table
| Cold-strip steel thickness/mm | Hot-strip thickness/mm | Reduction ratio |
| 1.21-1.40 | 3 | 59.7%-53.3% |
| 1.41-1.60 | 3 | 53.0%-46.7% |
| 1.61-1.80 | 3.5 | 54.0%-48.6% |
| 1.81-2.00 | 4 | 54.8%-50.0% |
| 2.01-2.25 | 4.5 | 55.3%-50.0% |
| 2.26-2.50 | 4.75 | 52.4%-47.4% |
Obtained hot dip galvanized dual phase steel cold-reduced sheet controls its surface superficial layer and rolls and splits and the formation of surface layer burr, thus
The multiple spot plating leakage that control generates in hot galvanizing process with the substrate of surface layer crackle and burr, zinc layers are uneven, reduce macroscopical mountain
The generation of peak line.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (1)
1. a kind of hot dip galvanized dual phase steel surface treatment method, the hot dip galvanized dual phase steel for being 600MPa or more for intensity rank；Its
It is characterized in that, the treating method comprises following steps:
Dual phase steel plate is heated, the heating cycle is low temperature fast firing, and the heating cycle is low temperature fast firing packet
Include: total heating time of the dual phase steel plate is 180-230min, and the soaking zone time of the dual phase steel plate is 35-
45min, the heating cycle are that the tapping temperature that low temperature fast firing includes: the dual phase steel plate is 1180-1220 DEG C；
Roughing and finish rolling are carried out to the dual phase steel plate after heating, the dual phase steel slab after described pair of heating carries out essence
Roll include: the dual phase steel plate entry temperature at finishing be 990-1020 DEG C；
Cold rolling is carried out to the dual phase steel plate after finish rolling, the cold rolling reduction ratio is 50-60%.
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| CN201611093104.7A CN106755867B (en) | 2016-12-01 | 2016-12-01 | A kind of hot dip galvanized dual phase steel surface treatment method |
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| CN201611093104.7A CN106755867B (en) | 2016-12-01 | 2016-12-01 | A kind of hot dip galvanized dual phase steel surface treatment method |
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| CN106755867B true CN106755867B (en) | 2019-01-18 |
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| CN109226260B (en) * | 2018-10-10 | 2020-01-07 | 鞍钢股份有限公司 | Method for avoiding ultra-low carbon steel edge burr defect |
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| CN102758131B (en) * | 2012-06-18 | 2014-08-20 | 河北钢铁股份有限公司邯郸分公司 | Production method of 600MPa grade cold rolling dual-phase steel |
| CN103184386B (en) * | 2013-04-12 | 2015-01-21 | 莱芜钢铁集团有限公司 | Method for improving mechanical property of low-carbon silicomanganese series cold rolling dual-phase steel |
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| CN106086638B (en) * | 2016-06-17 | 2018-08-21 | 首钢集团有限公司 | A kind of Galvanized Dual Phase Steel and its production method |
| CN106011643B (en) * | 2016-07-11 | 2018-05-01 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of tensile strength 590MPa grades of cold-rolled biphase steels and preparation method thereof |
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