CN106222541B - Iron-zinc coating steel plate and the production method that a kind of yield strength is 250MPa grades - Google Patents
Iron-zinc coating steel plate and the production method that a kind of yield strength is 250MPa grades Download PDFInfo
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- CN106222541B CN106222541B CN201610735299.4A CN201610735299A CN106222541B CN 106222541 B CN106222541 B CN 106222541B CN 201610735299 A CN201610735299 A CN 201610735299A CN 106222541 B CN106222541 B CN 106222541B
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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
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- 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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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- 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
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Thermal Sciences (AREA)
- Coating With Molten Metal (AREA)
Abstract
A kind of yield strength is 250MPa grades of iron zinc coating steel plate, and chemical constituent and wt% are：C:0.041~0.06%, Si：0.01~0.03%, Mn：0.34~0.50%, P≤0.02%, S≤0.015%, Als：0.015~0.05%, N≤0.005%.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 for use.The present invention can be under the premise of ensureing steel plate using mechanics, can also make galvanneal coating surface texture it is fine and close, without apparent 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 methods, and it is 250MPa 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 it is susceptible to 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 in the continuous production line, 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 0.077-0.12wt%, 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 inhibition resistance meeting bigger, is unfavorable for the diffusion of iron.Thus, the characteristic of two kinds of materials is different, it is required that 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 of production are higher, operation and control difficulty bigger, corresponding purposes and characteristic
It is different.
Therefore, the key indexes such as the manufacturing condition described in this document and material thickness specification are different from the present invention, and two
Person does not have comparativity.
A kind of alloying technology temperature, temperature data 450,480,510,540 is also found in patent retrieval（℃）, 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 variation.
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, the formula of settling at one go can be used and add
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, equipment investment and later stage may be used
Maintenance cost will be much lower.Obviously, using the mode of heating of from low to high, technology content higher, production cost is lower.
Invention content
The invention reside in the shortcomings of the prior art is overcome, a kind of premise that mechanics can be used in guarantee steel plate is provided
Under, moreover it is possible to make galvanneal coating surface texture it is fine and close, without apparent 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 250MPa grades.
Realize the measure of above-mentioned purpose：
A kind of yield strength is 250MPa grades of iron-zinc coating steel plate, and chemical constituent and weight percent content are：C:
0.041~0.06%, Si：0.01~0.03%, Mn：0.34~0.50%, P≤0.02%, S≤0.015%, Als：0.015~
0.05%, N≤0.005%, remaining is Fe and inevitable impurity.
Produce a kind of galvanized method for iron-zinc coating steel plate that yield strength is 250MPa grades, step：
1）Continuous hot galvanizing is carried out to the steel plate through cold rolling, and zinc pot temperature is controlled 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 0.077-0.120% in control zinc liquid；
2）After zinc-plated, steel plate is sent in the case where taking Insulation to zinc-iron DIFFUSION TREATMENT heating furnace, holding temperature exists
480-505℃；
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 heating speed not
525 DEG C are reduced to less than being heated to 555 DEG C under conditions of 210 DEG C/s, then by heating temperature；
4）Cooled to room temperature and for use 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 reinforcing is with obvious effects, cost of material is low.Content requirement is controlled in 0.041-
0.06%, if beyond this range, 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
0.34-0.50%, if beyond this range, 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 control is in 0.01-0.03%, such as
Fruit has surpassed this range, then 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 the temperature by strip itself steadily to provide zinc pot heat, is 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 in 0.077-0.120%, and effect has two：One is in zinc liquid
Middle formation Fe2Al5Middle layer or filter layer, the Fe atoms in base steel is avoided largely to be diffused into zinc liquid, mitigate Fe too high levels
Influence to 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,
The filter layer of formation will be partially thick, and iron atom is difficult to suitable into zinc-iron plating, it is impossible to form effective zinc-iron plating.When
So, as in zinc liquid aluminium content be less than 0.077%, then Fe2Al5Middle layer or filter layer it is too thin, appropriate filtering iron atom is not achieved
Effect.
Why the present invention takes the heat treatment 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 555 DEG C, then by greenhouse cooling to 525 DEG C not less than 210 DEG C/s conditions, is to make up stack effect production
The deficiency of raw temperature unevenness.Using such 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 480-505 DEG C is taken, is due to there is set a distance in the two process, strip is exposed in air second is that temperature
Decline, then the iron atom in strip can in this way cannot spread due to temperature is low into coating, iron content in coating is caused to be distributed
It is uneven.It cannot be spread at normal temperatures which solve iron atom, cause the problem of iron content is unevenly distributed in coating.
Compared with prior art, the present invention the present invention can be under the premise of ensureing steel plate using mechanics, moreover it is possible to make alloying
Coating surface compact structure, without apparent 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.
Description of the drawings
Attached drawing 1 is product coating surface morphology figure produced by the invention.
Specific 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 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 press following technique productions：
1）Continuous hot galvanizing is carried out to the steel plate through cold rolling, and zinc pot temperature is controlled 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 0.077-0.120% in control zinc liquid；
2）After zinc-plated, steel plate is sent in the case where taking Insulation to zinc-iron DIFFUSION TREATMENT heating furnace, holding temperature exists
480-505℃；
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 heating speed not
525 DEG C are reduced to less than being heated to 555 DEG C under conditions of 210 DEG C/s, then by heating temperature；
4）Cooled to room temperature and for use after zinc-iron DIFFUSION TREATMENT.
The chemical composition comparative example of each case study on implementation of 1 present invention of table and comparative example（wt.%）
The main technologic parameters comparative example of 2 various embodiments of the present invention of table and comparative example
Each case study on implementation of 3 present invention of table 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 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 260-275（MPa）, elongation percentage exists
41-42（%）, plating layer cross section iron content is 9.7~10.3（%）, the curved test anti-grinded hardness index of 60 ° of V is at 1 grade, hence it is evident that better than normal
2 grades of rule.Product does not occur dusting and obscission in stamping process.And the iron content of comparative sample is 8.3-8.5
（%）, 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. a kind of yield strength is the galvanized method of 250MPa grades of iron-zinc coating steel plate, it is characterised in that：Its step：
The yield strength is 250MPa grades of iron-zinc coating steel plate, and chemical constituent and weight percent content are：C:
0.041~0.06%, Si：0.01~0. 03%, Mn：0.37~0.5%, P≤0.02%, S≤0.015%, Als：0.015~
0.05%, N≤0.005%, remaining is Fe and inevitable impurity；
1）Continuous hot galvanizing is carried out to the steel plate through cold rolling, and zinc pot temperature is controlled to control at 455 ~ 465 DEG C, strip enters zinc pot temperature
Degree control is at 460 ~ 490 DEG C；Aluminium weight percent content is in 0.077-0.120% in control zinc liquid；
2）After zinc-plated, steel plate is sent in the case where taking Insulation to zinc-iron DIFFUSION TREATMENT heating furnace, holding temperature is in 480-
496℃；
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 heating speed
555 DEG C are heated under conditions of 210 DEG C/s, then heating temperature is reduced to 525 DEG C；
4）Cooled to room temperature and for use after zinc-iron DIFFUSION TREATMENT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610735299.4A CN106222541B (en) | 2016-08-26 | 2016-08-26 | Iron-zinc coating steel plate and the production method that a kind of yield strength is 250MPa grades |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610735299.4A CN106222541B (en) | 2016-08-26 | 2016-08-26 | Iron-zinc coating steel plate and the production method that a kind of yield strength is 250MPa grades |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106222541A CN106222541A (en) | 2016-12-14 |
| CN106222541B true CN106222541B (en) | 2018-06-08 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213017A (en) * | 2014-08-29 | 2014-12-17 | 武汉钢铁(集团)公司 | Galvanized steel sheet and production process 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 CN201610735299.4A patent/CN106222541B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2942419A1 (en) * | 2013-03-05 | 2015-11-11 | JFE Steel Corporation | High-strength hot-dip galvanized steel sheet and process for manufacturing same |
| CN104213017A (en) * | 2014-08-29 | 2014-12-17 | 武汉钢铁(集团)公司 | Galvanized steel sheet and production process 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 |
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| CN106222541A (en) | 2016-12-14 |
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Effective date of registration: 20170616 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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