CN106191663A - A kind of yield strength is ferrum zinc coating steel plate and the production method of 280MPa level - Google Patents
A kind of yield strength is ferrum zinc coating steel plate and the production method of 280MPa level Download PDFInfo
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- CN106191663A CN106191663A CN201610728429.1A CN201610728429A CN106191663A CN 106191663 A CN106191663 A CN 106191663A CN 201610728429 A CN201610728429 A CN 201610728429A CN 106191663 A CN106191663 A CN 106191663A
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- zinc
- steel plate
- ferrum
- coating
- temperature
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 47
- 239000010959 steel Substances 0.000 title claims abstract description 47
- 239000011701 zinc Substances 0.000 title claims abstract description 46
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 46
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 239000011248 coating agent Substances 0.000 title claims abstract description 37
- 238000000576 coating method Methods 0.000 title claims abstract description 37
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title abstract description 26
- 238000004519 manufacturing process Methods 0.000 title abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000009792 diffusion process Methods 0.000 claims abstract description 17
- 238000005246 galvanizing Methods 0.000 claims abstract description 5
- 238000009413 insulation Methods 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 238000005097 cold rolling Methods 0.000 claims abstract description 4
- 239000000470 constituent Substances 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 238000010304 firing Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 abstract description 12
- 238000006253 efflorescence Methods 0.000 abstract description 6
- 206010037844 rash Diseases 0.000 abstract description 6
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract description 3
- 238000005275 alloying Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000004411 aluminium Substances 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229910021328 Fe2Al5 Inorganic materials 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013068 control sample Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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- Coating With Molten Metal (AREA)
Abstract
A kind of yield strength is the ferrum zinc coating steel plate of 280MPa level, and its chemical constituent and wt% be: C:0.06～0.07%, Si:0.065～0. 08%, Mn:0.41～0.5%, P≤0.02%, S≤0.015%, Als:0.015～0.05%.Production stage: carry out continuous hot galvanizing to through cold rolling steel plate；Zinc-iron DIFFUSION TREATMENT heating furnace delivered under taking Insulation by steel plate；Steel plate after zinc-plated is carried out the zinc-iron DIFFUSION TREATMENT of low temperature after first high temperature.Naturally cool to room temperature stand-by.On the premise of the present invention can use mechanics ensureing steel plate, can also make galvanneal coating surface texture fine and close, without obvious micro-crack defect, coating surface zinc-iron crystal grain is tiny and size distribution is uniform, coating is firmly combined with steel substrate, and coating is difficult to efflorescence and obscission occur when stamping.
Description
Technical field
The present invention relates to a kind of galvanized steel plain sheet and production method thereof, specifically belonging to a kind of yield strength is 280MPa level
Ferrum-zinc coating steel plate and production method, and it is applicable to the thickness of steel plate at 0.7-1.2mm.
Background technology
Zinc-iron plating steel plate (GA) has excellent corrosion resistance, coating, weldability and anti-chad impact performance, extensively
General it is applied to car panel.But, the most easily occur that cadmia zinc gray, coating cross section iron content and phase structure are divided at its coating surface
Cloth is uneven, coming off and the deficiency such as efflorescence of coating easily occurs, thus give punching parts surface quality and produce mould during punch forming
Tool brings adverse effect.
Through patent retrieval, find the production method of a kind of Zn-Fe alloying plate of think gauge without efflorescence, by thickness be 1.6～
2.0mm strip steel is annealed on tinuous production, zinc-plated, alloying, smooth, cutting step obtain Zn-Fe alloying plate；It is special
Levying and be, in described zinc-plated step, control zinc liquid temperature is at 460 ± 5 DEG C, and zinc liquid aluminium content is 0.12～0.14wt%.
Compared with the present patent application, the zinc liquid aluminium content of the application is at 0.074-0.12wt%, hence it is evident that less than the document
0.12～0.14wt%.If zinc liquid aluminium content is higher, then aluminum-ferrum the inhibition layer formed in zinc liquid is to ferrum expansion in coating zinc
The suppression resistance dissipated can be bigger, is unfavorable for the diffusion of ferrum.Thus, the characteristic of bi-material is different, its zinc liquid zinc required
Content is the most different.
It addition, the belt steel thickness specification of this patent is at 0.7-1.2mm, also thick significantly lower than 1.6～2.0mm in document
Degree.Obviously, strip steel is the thinnest, and its process specifications produced is the highest, and it is bigger that operation controls difficulty, and corresponding purposes and characteristic are also
Different.
Therefore, the manufacturing condition described in this document is different from the present invention with key indexs such as material thickness specifications, and two
Person does not has comparability.
Patent retrieval is also found that a kind of alloying technology temperature, its temperature data is 450,480,510,540(DEG C), but
It adds mode of heating is all the constant type temperature heating used, and i.e. during heating, temperature settles at one go, and centre does not has segmentation or change.
Generally, mode of heating is divided into three kinds, including low-head heating after constant type heating, the lowest rear high formula zone heating, first height.And this is specially
Profit uses low-head mode of heating after first height, significantly different with the mode of heating described in document.The heating of Alloying Treatment
Mode is relevant with the equipment of production or material behavior.If using fully closed alloying furnace, then the formula of settling at one go can be used to add
Hot mode, but the input of this equipment is the highest, equipment complexity, safeguards and the cost of accessory is the highest.But, if to heating side
Formula is optimized, mode of heating low after i.e. using first height, then can use semi-enclosed alloying furnace, its equipment investment and later stage
Maintenance cost will be much lower.Obviously, mode of heating low after using first height, its technology content is higher, and production cost is lower.
Summary of the invention
The invention reside in the deficiency overcoming prior art to exist, it is provided that a kind of premise that can use mechanics at guarantee steel plate
Under, moreover it is possible to make galvanneal coating surface texture fine and close, without obvious micro-crack defect, coating surface zinc-ferrum crystal grain tiny and size
Being evenly distributed, coating is firmly combined with steel substrate, and coating is difficult to surrender efflorescence occur with obscission when stamping
Intensity is ferrum-zinc coating steel plate and the production method of 280MPa level.
Realize the measure of above-mentioned purpose:
A kind of yield strength is the ferrum-zinc coating steel plate of 280MPa level, and its chemical constituent and weight percent content be: C:
0.06～0.07%, Si:0.065～0. 08%, Mn:0.41～0.5%, P≤0.02%, S≤0.015%, Als:0.015～
0.05%, remaining for Fe and inevitable impurity.
Producing the galvanized method of ferrum-zinc coating steel plate that a kind of yield strength is 280MPa level, it is: its step:
1) carrying out continuous hot galvanizing to through cold rolling steel plate, and control zinc pot temperature and control at 455 ~ 465 DEG C, strip steel enters zinc pot temperature
Degree controls at 460 ~ 490 DEG C；In control zinc liquid, aluminum weight percent content is at 0.074-0.120%；
2) after zinc-plated end, steel plate being delivered under taking Insulation zinc-ferrum DIFFUSION TREATMENT heating furnace, holding temperature is at 480-
510℃；
3) zinc-ferrum DIFFUSION TREATMENT of low temperature after the steel plate after zinc-plated being carried out first high temperature: first steel plate is not less than in firing rate
It is heated to 560 DEG C under conditions of 220 DEG C/s, then heating-up temperature is reduced to 530 DEG C；
4) room temperature stand-by is naturally cooled to after zinc-ferrum DIFFUSION TREATMENT.
The effect of the main intensified element such as C, Mn, Si and mechanism in the present invention:
C is gap intensified element, is characterized in strengthening effect obvious, and cost of material is low.Content requirement controls at 0.06-0.07%,
If beyond this scope, then the intensity of material is the most on the low side or higher.
Mn is displacement intensified element, is characterized in strengthening slightly below C element, and cost is higher than C element.Content requirement controls
0. 41-0.50%, if beyond this scope, then the intensity of material can be on the low side or higher.
The strengthening effect of Si and cost of material are all between C and Mn element.Content requirement controls at 0.065-0.080%,
If having surpassed this scope, then the intensity of material is the most on the low side or higher.
Why cold-reduced sheet is carried out, in continuous hot galvanizing and zinc-ferrum DIFFUSION TREATMENT, being controlled by zinc pot temperature by the present invention
460 ± 5 DEG C, strip steel enters zinc pot temperature and controls at 460 ~ 490 DEG C, will enter zinc pot temperature higher than zinc pot temperature less than 30 by strip steel
DEG C, it is that the temperature by strip steel self steadily provides zinc pot heat, to open to make up naturally declining of zinc pot temperature
Galvanic electricity heater heats.Increase heat because starting zinc pot electric heater, zinc liquid temperature larger fluctuation can be caused, cause the zinc the bottom of a pan
Portion's cadmia floats, and pollutes steel sheet zinc coating surface, forms coating surface cadmia or zinc gray.Here it is the surface of steel plate of the present invention is without zinc
The key point of slag.
Why aluminum content in zinc liquid is controlled at 0.074-0.12% by the present invention, and effect has two: the first is in zinc liquid
Form Fe2Al5Intermediate layer or filter course, it is to avoid the Fe atom in base steel is diffused in zinc liquid in a large number, alleviates Fe too high levels pair
The impact of zinc liquid degree of purity, thus improve the cleaning quality of coating surface.Its two be as in zinc liquid aluminum content higher than 0.12%, shape
The filter course become will be partially thick, and iron atom is difficult to appropriate entrance zinc-iron plating, and can not form effective zinc-iron plating.When
So, as in zinc liquid, aluminum content is less than 0.074%, then Fe2Al5Intermediate layer or filter course are the thinnest, do not reach appropriate filtration iron atom
Effect.
Why the present invention, when zinc-ferrum DIFFUSION TREATMENT, takes the heat treated mode of low temperature after first high temperature, is i.e. first adding
Thermal velocity is first to heat to 560 DEG C being not less than 220 DEG C/s condition, then by greenhouse cooling to 530 DEG C, is that making up stack effect produces
The deficiency that raw temperature is uneven.Use this kind of zinc-ferrum DIFFUSION TREATMENT mode of heating, can improve further coating cross section iron content and
Uniformity.
The present invention is why when zinc-ferrum DIFFUSION TREATMENT, to the galvanized steel plain sheet between zinc pot and zinc-ferrum DIFFUSION TREATMENT stove
Taking Insulation at 480-510 DEG C, be owing to there being set a distance in both operations, strip steel is exposed two is temperature in atmosphere
Decline, the most then the iron atom in strip steel can be made can not to spread in coating because temperature is low, cause iron content distribution in coating
Uneven.Which solve iron atom to spread at normal temperatures, cause the problem pockety of iron content in coating.
Compared with prior art, the present invention can be on the premise of ensureing steel plate use mechanics, moreover it is possible to makes alloying for the present invention
Coating surface compact structure, tiny without obvious micro-crack defect, coating surface zinc-ferrum crystal grain and size distribution uniform, coating with
Steel substrate is firmly combined with, and coating is difficult to efflorescence and obscission occur when stamping.
Accompanying drawing explanation
The product coating surface morphology figure that accompanying drawing 1 produces for the present invention.
Detailed description of the invention
Below the present invention is described in detail:
Table 1 is the chemical composition value list of various embodiments of the present invention and comparative example；
Table 2 is the main technologic parameters value list of various embodiments of the present invention and comparative example；
Table 3 is various embodiments of the present invention and the tensile property of comparative example and quality of coating situation list.
Various embodiments of the present invention are all produced by following technique:
1) carrying out continuous hot galvanizing to through cold rolling steel plate, and control zinc pot temperature and control at 455 ~ 465 DEG C, strip steel enters zinc pot temperature
Degree controls at 460 ~ 490 DEG C；In control zinc liquid, aluminum weight percent content is at 0.074-0.120%；
2) after zinc-plated end, steel plate being delivered under taking Insulation zinc-ferrum DIFFUSION TREATMENT heating furnace, holding temperature is at 480-
510℃；
3) zinc-ferrum DIFFUSION TREATMENT of low temperature after the steel plate after zinc-plated being carried out first high temperature: first steel plate is not less than in firing rate
It is heated to 560 DEG C under conditions of 220 DEG C/s, then heating-up temperature is reduced to 530 DEG C；
4) room temperature stand-by is naturally cooled to after zinc-ferrum DIFFUSION TREATMENT.
Chemical composition value list (wt.%) of each case study on implementation of table 1 present invention and comparative example
The main technologic parameters value list of table 2 various embodiments of the present invention and comparative example
The each case study on implementation of table 3 present invention and the tensile property of comparative example and quality of coating situation list
From table 3 it can be seen that the steel plate thickness of institute's case study on implementation is at 0.7-1.2mm, corresponding excellent in mechanical performance, surrender is strong
Degree, tensile strength and elongation percentage are satisfied by corresponding requirements, and wherein, yield strength distribution is at 300-315(MPa), elongation percentage exists
35.5-38(%), coating cross section iron content is 9.8～10.4(%), 60 ° of V curved test anti-grinded hardness index are all at 1 grade, hence it is evident that be better than
Conventional 2 grades.Product does not occurs efflorescence and obscission in stamping process.And the iron content of control sample is 8.1-8.2
(%), bigger with the gap of desired value 10.0%；The anti-powdering index of phase also only 2 grades, hence it is evident that less than 1 grade of index of the present invention.
This detailed description of the invention is only and most preferably enumerates, the not restricted enforcement to technical solution of the present invention.
Claims (2)
1. yield strength is ferrum-zinc coating steel plate of 280MPa level, and its chemical constituent and weight percent content be: C:
0.06～0.07%, Si:0.065～0. 08%, Mn:0.41～0.5%, P≤0.02%, S≤0.015%, Als:0.015～
0.05%, remaining for Fe and inevitable impurity.
2. produce the galvanized method of ferrum-zinc coating steel plate that a kind of yield strength as claimed in claim 1 is 280MPa level, its
It is characterised by: its step:
1) carrying out continuous hot galvanizing to through cold rolling steel plate, and control zinc pot temperature and control at 455 ~ 465 DEG C, strip steel enters zinc pot temperature
Degree controls at 460 ~ 490 DEG C；In control zinc liquid, aluminum weight percent content is at 0.074-0.120%；
2) after zinc-plated end, steel plate being delivered under taking Insulation zinc-ferrum DIFFUSION TREATMENT heating furnace, holding temperature is at 480-
510℃；
3) zinc-ferrum DIFFUSION TREATMENT of low temperature after the steel plate after zinc-plated being carried out first high temperature: first steel plate is not less than in firing rate
It is heated to 560 DEG C under conditions of 220 DEG C/s, then heating-up temperature is reduced to 530 DEG C；
4) room temperature stand-by is naturally cooled to after zinc-ferrum DIFFUSION TREATMENT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610728429.1A CN106191663B (en) | 2016-08-26 | 2016-08-26 | Iron-zinc coating steel plate and the production method that a kind of yield strength is 280MPa grades |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610728429.1A CN106191663B (en) | 2016-08-26 | 2016-08-26 | Iron-zinc coating steel plate and the production method that a kind of yield strength is 280MPa grades |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106191663A true CN106191663A (en) | 2016-12-07 |
| CN106191663B CN106191663B (en) | 2018-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610728429.1A Active CN106191663B (en) | 2016-08-26 | 2016-08-26 | Iron-zinc coating steel plate and the production method that a kind of yield strength is 280MPa grades |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796949A (en) * | 2012-07-31 | 2012-11-28 | 马钢(集团)控股有限公司 | Hot galvanizing steel plate with yield strength more than or equal to 550MPa, and manufacturing method thereof |
| CN104988389A (en) * | 2015-07-30 | 2015-10-21 | 武汉钢铁(集团)公司 | Automobile alloyed hot-dip galvanized steel with tensile strength of 340 MPa grade and production method thereof |
| EP2942419A1 (en) * | 2013-03-05 | 2015-11-11 | JFE Steel Corporation | High-strength hot-dip galvanized steel sheet and process for manufacturing same |
-
2016
- 2016-08-26 CN CN201610728429.1A patent/CN106191663B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796949A (en) * | 2012-07-31 | 2012-11-28 | 马钢(集团)控股有限公司 | Hot galvanizing steel plate with yield strength more than or equal to 550MPa, and manufacturing method thereof |
| EP2942419A1 (en) * | 2013-03-05 | 2015-11-11 | JFE Steel Corporation | High-strength hot-dip galvanized steel sheet and process for manufacturing same |
| CN104988389A (en) * | 2015-07-30 | 2015-10-21 | 武汉钢铁(集团)公司 | Automobile alloyed hot-dip galvanized steel with tensile strength of 340 MPa grade and production method thereof |
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| Publication number | Publication date |
|---|---|
| CN106191663B (en) | 2018-05-01 |
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Effective date of registration: 20170728 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Applicant after: Wuhan iron and Steel Company Limited Address before: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Applicant before: WUHAN IRON AND STEEL CORPORATION |
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