CN106191663B - Iron-zinc coating steel plate and the production method that a kind of yield strength is 280MPa grades - Google Patents
Iron-zinc coating steel plate and the production method that a kind of yield strength is 280MPa grades Download PDFInfo
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- CN106191663B CN106191663B CN201610728429.1A CN201610728429A CN106191663B CN 106191663 B CN106191663 B CN 106191663B CN 201610728429 A CN201610728429 A CN 201610728429A CN 106191663 B CN106191663 B CN 106191663B
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- zinc
- steel plate
- iron
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- coating
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 239000011248 coating agent Substances 0.000 title claims abstract description 34
- 238000000576 coating method Methods 0.000 title claims abstract description 34
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 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
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 37
- 239000011701 zinc Substances 0.000 claims description 37
- 229910052725 zinc Inorganic materials 0.000 claims description 37
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 31
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 16
- 239000004411 aluminium Substances 0.000 claims description 9
- 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 6
- 238000010304 firing Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 238000010410 dusting Methods 0.000 abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 11
- 238000005275 alloying Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000007747 plating Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 229910021328 Fe2Al5 Inorganic materials 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004140 cleaning Methods 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
- 238000006073 displacement reaction Methods 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
- 230000008092 positive effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 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
Landscapes
- Coating With Molten Metal (AREA)
Abstract
A kind of yield strength is 280MPa grades of iron zinc coating steel plate, its chemical constituent and wt% are：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：Continuous hot galvanizing is carried out to the steel plate through cold rolling；Steel plate is sent in the case where taking Insulation to zinc-iron DIFFUSION TREATMENT heating furnace；The zinc-iron DIFFUSION TREATMENT of low temperature after first high temperature is carried out to the steel plate after zinc-plated.Cooled to room temperature is simultaneously stand-by.On the premise of the present invention can use mechanics ensureing steel plate, can also make galvanneal coating surface texture it is 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 less prone to dusting and obscission when stamping.
Description
Technical field
The present invention relates to a kind of galvanized steel plain sheet and its production method, and it is 280MPa grades to specifically belong to a kind of yield strength
Iron-zinc coating steel plate and production method, and it is suitable for the thickness of steel plate in 0.7-1.2mm.
Background technology
Zinc-iron plating steel plate（GA）Performance is impacted with excellent corrosion resistance, coating, weldability and anti-chad, extensively
It is general to be applied to car panel.However, but easily there is cadmia zinc gray, plating layer cross section iron content and phase structure point in its coating surface
Cloth is uneven, and the coming off and the deficiencies of dusting of coating easily occurs in when punch forming, so as to punching parts surface quality and production mould
Tool brings adverse effect.
Through patent retrieval, find a kind of production method of no dusting think gauge Zn-Fe alloying plate, by thickness for 1.6~
2.0mm strips are annealed on tinuous production, zinc-plated, alloying, smooth, cutting step obtain Zn-Fe alloying plate；It is special
Sign is, in the zinc-plated step, control zinc liquid temperature is at 460 ± 5 DEG C, and zinc liquid aluminium content is in 0.12~0.14wt%.
Compared with the present patent application, the zinc liquid aluminium content of the application is in 0.074-0.12wt%, hence it is evident that less than the document
0.12~0.14wt%.If zinc liquid aluminium content is higher, aluminium-expansion of the iron inhibition layer to iron into coating zinc for being formed in zinc liquid
Scattered suppression resistance meeting bigger, is unfavorable for the diffusion of iron.Thus, the characteristic of two kinds of materials is different, its desired zinc liquid zinc
Content is also different.
In addition, the belt steel thickness specification of this patent is in 0.7-1.2mm, it is also thick significantly lower than 1.6~2.0mm in document
Degree.Obviously, strip is thinner, and the process specifications that it is produced are higher, operation control difficulty bigger, corresponding purposes and characteristic
It is different.
Therefore, the key index such as the manufacturing condition described in this document and material thickness specification is different from the present invention, and two
Person does not have comparativity.
A kind of alloying technology temperature is also found in patent retrieval, its temperature data is 450,480,510,540（℃）, but
It adds mode of heating to be all the constant type temperature heating used, that is, temperature settles at one go when heating, and centre is without segmentation or change.
In general, mode of heating is divided into three kinds, including constant type heating, first low rear high formula heat stepwise, the heating of from low to high formula.And this is specially
Profit is significantly different with the mode of heating described in document using from low to high formula mode of heating.The heating of Alloying Treatment
Mode is related with production equipment or material property.If using fully closed alloying furnace, can be added using formula is settled at one go
Hot mode, but the input of this equipment is very high, and equipment is complicated, safeguards and the cost of accessory is also very high.But if to heating side
Formula optimizes, i.e., using the mode of heating of from low to high, semi-enclosed alloying furnace may be used, its equipment investment and later stage
Maintenance cost will be much lower.Obviously, it is lower using the mode of heating of from low to high, its technology content higher, production cost.
The content of the invention
The invention reside in overcome the shortcomings of the prior art, there is provided a kind of to ensure premise of the steel plate using mechanics
Under, moreover it is possible to make galvanneal coating surface texture it is fine and close, without obvious micro-crack defect, coating surface zinc-iron crystal grain is tiny and size
It is evenly distributed, coating is firmly combined with steel substrate, and coating is less prone to dusting and the surrender of obscission when stamping
Iron-zinc coating steel plate and the production method that intensity is 280MPa grades.
Realize the measure of above-mentioned purpose：
A kind of yield strength is 280MPa grades of iron-zinc coating steel plate, its chemical constituent and weight percent content are：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 is Fe and inevitable impurity.
A kind of galvanized method for iron-zinc coating steel plate that yield strength is 280MPa grades is produced, it is：Its step：
1）Continuous hot galvanizing is carried out to the steel plate through cold rolling, and controls zinc pot temperature to control at 455 ~ 465 DEG C, strip enters zinc
Pot temperature is controlled at 460 ~ 490 DEG C；Aluminium weight percent content is in 0.074-0.120% in control zinc liquid；
2）After zinc-plated, steel plate is sent to zinc-iron DIFFUSION TREATMENT heating furnace, holding temperature in the case where taking Insulation and is existed
480-510℃；
3）Zinc-iron DIFFUSION TREATMENT of low temperature after first high temperature is carried out to the steel plate after zinc-plated：First by steel plate in firing rate not
530 DEG C are reduced to less than being heated to 560 DEG C under conditions of 220 DEG C/s, then by heating-up temperature；
4）Cooled to room temperature and stand-by after zinc-iron 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, its main feature is that strengthening positive effect, cost of material is low.Content requirement is controlled in 0.06-
0.07%, if exceeding this scope, the intensity of material is easily relatively low or higher.
Mn is displacement intensified element, is slightly below C element its main feature is that strengthening, cost is higher than C element.Content requirement control exists
0. 41-0.50%, if exceeding this scope, the intensity of material can be relatively low or higher.
The reinforcing effect and cost of material of Si is between C and Mn elements.Content requirement is controlled in 0.065-0.080%,
If having surpassed this scope, the intensity of material is easily relatively low or higher.
Why the present invention is carried out in continuous hot galvanizing and zinc-iron DIFFUSION TREATMENT cold-reduced sheet, and zinc pot temperature control is existed
460 ± 5 DEG C, strip enters zinc pot temperature control at 460 ~ 490 DEG C, i.e., strip is entered zinc pot temperature is no more than 30 higher than zinc pot temperature
DEG C, it is steadily to provide zinc pot heat by the temperature of strip itself, to be opened with making up the natural decline of zinc pot temperature
Dynamic electric heater heats.Increase heat because starting zinc pot electric heater, zinc liquid temperature larger fluctuation can be caused, cause zinc pot bottom
Portion's cadmia floats, and pollution steel sheet zinc coating surface, forms coating surface cadmia or zinc gray.Surface of steel plate here it is the present invention is without zinc
The key point of slag.
Why the present invention controls the aluminium content in zinc liquid has two in 0.074-0.12%, effect：One is in zinc liquid
Form Fe2Al5Intermediate layer or filter layer, avoid the Fe atoms in base steel from being largely diffused into zinc liquid, mitigate Fe too high levels pair
The influence of zinc liquid degree of purity, so as to improve the cleaning quality of coating surface.The second is aluminium content is higher than 0.12% in such as zinc liquid, shape
Into filter layer will be partially thick, iron atom be difficult to it is suitable enter zinc-iron plating, and cannot zinc-iron plating formed with effect.When
So, as in zinc liquid aluminium content be less than 0.074%, then Fe2Al5Intermediate layer or filter layer are too thin, do not reach appropriate filtering iron atom
Effect.
Why the present invention takes the heating mode of low temperature after first high temperature in zinc-iron DIFFUSION TREATMENT, i.e., is first adding
Thermal velocity is being first to heat to 560 DEG C not less than 220 DEG C/s conditions, then by greenhouse cooling to 530 DEG C, is to make up stack effect production
The deficiency of raw temperature inequality.Using such a zinc-iron DIFFUSION TREATMENT mode of heating, can further improve plating layer cross section iron content and
Uniformity.
The present invention is why in zinc-iron DIFFUSION TREATMENT, to the galvanized steel plain sheet between zinc pot and zinc-iron DIFFUSION TREATMENT stove
The Insulation at 480-510 DEG C is taken, is due to have set a distance in both processes, exposed strip two is in atmosphere temperature
Decline, so the iron atom in strip can then cannot spread because temperature is low into coating, cause iron content in coating to be distributed
It is uneven.Which solving iron atom cannot spread, cause the problem of iron content skewness in coating at normal temperatures.
Compared with prior art, the present invention on the premise of the present invention can use mechanics ensureing steel plate, moreover it is possible to make alloying
Coating surface compact structure, without obvious micro-crack defect, coating surface zinc-iron crystal grain is tiny and size distribution is uniform, coating with
Steel substrate is firmly combined with, and coating is less prone to dusting and obscission when stamping.
Brief description of the drawings
Attached drawing 1 is product coating surface morphology figure produced by the invention.
Embodiment
The present invention is described in detail below：
Table 1 is various embodiments of the present invention and the chemical composition comparative example of comparative example；
Table 2 is various embodiments of the present invention and the main technologic parameters comparative example of comparative example；
Table 3 is tensile property and the quality of coating situation list of various embodiments of the present invention and comparative example.
Various embodiments of the present invention press following technique productions：
1）Continuous hot galvanizing is carried out to the steel plate through cold rolling, and controls zinc pot temperature to control at 455 ~ 465 DEG C, strip enters zinc
Pot temperature is controlled at 460 ~ 490 DEG C；Aluminium weight percent content is in 0.074-0.120% in control zinc liquid；
2）After zinc-plated, steel plate is sent to zinc-iron DIFFUSION TREATMENT heating furnace, holding temperature in the case where taking Insulation and is existed
480-510℃；
3）Zinc-iron DIFFUSION TREATMENT of low temperature after first high temperature is carried out to the steel plate after zinc-plated：First by steel plate in firing rate not
530 DEG C are reduced to less than being heated to 560 DEG C under conditions of 220 DEG C/s, then by heating-up temperature；
4）Cooled to room temperature and stand-by after zinc-iron DIFFUSION TREATMENT.
The chemical composition comparative example of each case study on implementation of the present invention of table 1 and comparative example（wt.%）
The main technologic parameters comparative example of 2 various embodiments of the present invention of table and comparative example
Tensile property and the quality of coating situation list of each case study on implementation of the present invention of table 3 and comparative example
From table 3 it can be seen that the steel plate thickness of institute's case study on implementation is in 0.7-1.2mm, corresponding excellent in mechanical performance, surrender
Intensity, tensile strength and elongation percentage are satisfied by corresponding requirements, wherein, yield strength distribution is in 300-315（MPa）, elongation percentage exists
35.5-38（%）, plating layer cross section iron content is 9.8~10.4（%）, the curved test anti-grinded hardness index of 60 ° of V is at 1 grade, hence it is evident that is better than
Conventional 2 grades.Product does not occur dusting and obscission in stamping process.And the iron content of comparative sample is 8.1-8.2
（%）, it is larger with the gap of desired value 10.0%；The anti-powdering index of phase also only has 2 grades, hence it is evident that less than 1 grade of index of the present invention.
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.
Claims (1)
1. the galvanized method for iron-zinc coating steel plate that a kind of yield strength of production is 280MPa grades, yield strength is 280MPa grades
Iron-zinc coating steel plate 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 is Fe and inevitable impurity；It is walked
Suddenly：
1）Continuous hot galvanizing is carried out to the steel plate through cold rolling, and controls zinc pot temperature to control at 455 ~ 465 DEG C, strip enters zinc pot temperature
Degree control is at 481 ~ 490 DEG C；Aluminium weight percent content is in 0.074-0.120% in control zinc liquid；
2）After zinc-plated, steel plate is sent to zinc-iron DIFFUSION TREATMENT heating furnace in the case where taking Insulation, holding temperature is in 480-
510℃；
3）Zinc-iron DIFFUSION TREATMENT of low temperature after first high temperature is carried out to the steel plate after zinc-plated：First steel plate is not less than in firing rate
560 DEG C are heated under conditions of 220 DEG C/s, then heating-up temperature is reduced to 530 DEG C；
4）Cooled to room temperature and stand-by after zinc-iron 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 CN106191663A (en) | 2016-12-07 |
| CN106191663B true 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 |
|---|---|
| CN106191663A (en) | 2016-12-07 |
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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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