CN106636921A - Iron-zinc plated steel plate with yield strength of 420MPa grade and production method - Google Patents

Iron-zinc plated steel plate with yield strength of 420MPa grade and production method Download PDF

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Publication number
CN106636921A
CN106636921A CN201611177985.0A CN201611177985A CN106636921A CN 106636921 A CN106636921 A CN 106636921A CN 201611177985 A CN201611177985 A CN 201611177985A CN 106636921 A CN106636921 A CN 106636921A
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CN
China
Prior art keywords
steel plate
percent
zinc
iron
yield strength
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Pending
Application number
CN201611177985.0A
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Chinese (zh)
Inventor
陈宇
杜小峰
彭涛
方芳
胡宽辉
潘利波
李立军
张彦文
王立辉
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Corp
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Filing date
Publication date
Application filed by Wuhan Iron and Steel Corp filed Critical Wuhan Iron and Steel Corp
Priority to CN201611177985.0A priority Critical patent/CN106636921A/en
Publication of CN106636921A publication Critical patent/CN106636921A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • 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
    • 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

Abstract

The invention provides an iron-zinc plated steel plate with the yield strength of 420MPa grade. The iron-zinc plated steel plate is prepared from the following chemical components in percentage by weight: 0.10 percent to 0.11 percent of C, less than or equal to 0.06 percent of Si, 0.71 percent to 0.92 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.012 percent of S, 0.02 percent to 0.05 percent of Al and 0.03 percent to 0.04 percent of Nb. A production method comprises the following steps: cooling a hotly rolled steel plate; carrying out continuous hot dip galvanizing; conveying the steel plate into a zinc-iron dispersion treatment heating furnace for conventionally heating under a heat preservation measure; naturally cooling to room temperature for later use. According to the iron-zinc plated steel plate provided by the invention, the utilization mechanics and utilization performance of the steel plate can be guaranteed; a plated layer is firmly combined with a steel substrate; the defect problems that the steel plate is plated in an uncoated manner, caused by a Si element and the like can also be avoided under the condition that the plated layer does not easily have pulverization and falling-off phenomena in a punching and forming process.

Description

A kind of yield strength is the iron-zinc coating steel plate and production method of 420MPa levels
Technical field
The present invention relates to a kind of yield strength of matrix material is that 420MPa levels, coating surface are clean without cadmia zinc gray, plating The zinc that layer cross section iron content and phase structure are evenly distributed-iron plating steel plate and its production method, the thickness specification of steel plate is in 0.7- 1.2mm, can meet the demand of lightweight automotive sheet.
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, easily occurs coming off and the deficiency such as efflorescence for coating during punch forming, so as to give punching parts surface quality and production mould Tool brings adverse effect.
Jing patent retrievals, find a kind of production method without efflorescence think gauge Zn-Fe alloying plate, by thickness be 1.6～ 2.0mm strips are annealed on tinuous production, zinc-plated, alloying, smooth, cutting step obtain Zn-Fe alloying plate；It is special Levy and be, in the zinc-plated step, at 460 ± 5 DEG C, zinc liquid aluminium content is in 0.12～0.14wt% for control zinc liquid temperature.
Compared with the present patent application, the zinc liquid aluminium content of the application is in 0.055-0.12wt%, hence it is evident that less than the document 0.12～0.14wt%.If zinc liquid aluminium content is higher, the aluminium-iron inhibition layer formed in zinc liquid is to iron to the expansion in coating zinc Scattered suppression resistance can be bigger, is unfavorable for the diffusion of iron.Thus, the characteristic of bi-material is different, its desired zinc liquid aluminium Content is also different.
In addition, the belt steel thickness specification of this patent is in 0.7-1.2mm, also significantly lower than document in 1.6～2.0mm it is thick Degree.Obviously, strip is thinner, and the process specifications of its production are higher, and operational control difficulty is bigger, corresponding purposes and characteristic It is different.
The key index such as manufacturing condition therefore, described in this document and material thickness specification is different from the present invention, and two Person does not have comparativity.
Patent retrieval is also found that a kind of alloying technology temperature, and its temperature data is 450,480,510,540（℃）, but It is all the constant type temperature heating for adopting that it adds mode of heating, that is, temperature is settled at one go when heating, and centre is without segmentation or changes. Generally, mode of heating is divided into low-head heating after three kinds, including constant type heating, first low rear high formula heat stepwise, 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 production equipment or material behavior.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 is optimized, i.e., using mode of heating low after first height, then can use semi-enclosed alloying furnace, its equipment investment and later stage Maintenance cost will be much lower.Obviously, using mode of heating low after first height, its technology content is higher, and production cost is lower.
This patent adopt the ultrafast cold means of hot rolling, the strength of materials is improved by fetrite grain refinement, to reduce steel in The addition of intensified element Mn, so as to reduce the cost of material；Equally, the effect of refined crystalline strengthening is also eliminated in steel and should added Intensified element silicon, and then avoid silicon to coating surface produce produce defect.
The content of the invention
The invention reside in overcome the shortcomings of that original technology is present, by manganese content in reduction steel and cancellation element silicon, there is provided One kind can use mechanics and performance steel plate is ensured, moreover it is possible to the problems such as surface of steel plate dew for solving Si elements and causing is plated.
Realize the measure of above-mentioned purpose：
A kind of yield strength is the iron-zinc coating steel plate of 420MPa levels, and its chemical constituent and weight percent content are：C: 0.10～0.11%, Si：≤ 0.06%, Mn：0.71～0.92%, P≤0.02%, S≤0.012%, Al：0.02～0.05%, Nb： 0.03 ~ 0.04%, it is remaining for Fe and inevitable impurity.
The method for producing iron-zinc coating steel plate that a kind of yield strength is 420MPa levels, it is characterised in that：Its step：
1）470 DEG C are cooled under 380 DEG C/s of cooling velocity to the steel plate after hot rolling, it is subsequently cold rolling；
2）Continuous hot galvanizing is carried out, and controls zinc pot temperature control at 460 ± 3 DEG C, strip enters zinc pot temperature and controls in 460-485 ℃；Aluminium weight percent content is 0.055 ~ 0.065% in control zinc liquid；
3）After zinc-plated end, steel plate is delivered into zinc-iron DIFFUSION TREATMENT heating furnace conventional heating in the case where Insulation is taken, do not surpassed Cross under conditions of 3s and be heated to 550 DEG C；Holding temperature is controlled at 485 ~ 530 DEG C；
4）Naturally cool to room temperature and stand-by..
Effect and the mechanism of each main intensified element and technique in the present invention：
C is gap intensified element, is characterized in strengthening effect substantially, and cost of material is low.Content requirement is controlled in 0.10-0.11%, If exceeding this scope, the intensity of material is easily low or higher.
Mn is displacement intensified element, is characterized in that reinforcing is slightly below C element, and cost is higher than C element.Content requirement control exists 0.71-0.92%, if exceeding this scope, the intensity of material can be low or higher.
Si, is controlled by the present invention as unfavorable element, this is because aborning it has furthermore been found that working as silicon Content can cause surface of steel plate coating to produce the problems such as revealing plating as effective element, and during higher than 0.06%.
As deoxidant element in base steel, control range if it exceeds 0.05%, will increase into Al 0.02～0.05% This；If being less than 0.02%, it is insufficient to be susceptible to deoxidation, causes the field trash such as iron oxide in steel.
Nb is micro alloying element, is characterized in being combined with C, N element in steel, forms Nb (CN) Second Phase Precipitation thing, resistance It is only brilliant elongated big, reach the effect of refinement reinforcing and precipitation strength.Content requirement is controlled in 0.03-0.04%, if exceeding this model Enclose, then the intensity of material can be low or higher.
Why the present invention controls strip enters zinc pot temperature at 460-485 DEG C, is due to if above 485 DEG C, easily increasing Plus zinc liquid temperature, cause Zinc bath bottom slag to float；If being less than 460 DEG C, zinc liquid temperature is easily reduced, now the electrical heating of zinc pot bottom Device can work, and can also cause bottom cadmia to float.
Why the present invention carries out finish to gauge to hot rolled plate quickly cools down, and is exactly, by ultrafast refrigeration technique, to obtain tiny iron Ferritic crystal grain, to realize the refined crystalline strengthening of material, so as to replace traditional manganese, silicon solution strengthening, had both reduced cost, also improved Material toughness.Because fine grain is thin strong while material is improved, significantly impact no on the toughness of material；And solid solution is strong Change can reduce the toughness of material.
Why the present invention controls the aluminium content in zinc liquid in 0.055-0.065%, and effect has two：The first is in zinc liquid Middle formation Fe2Al5Intermediate layer or filter layer, it is to avoid the Fe atoms in base steel are diffused into a large number in zinc liquid, mitigate Fe too high levels Impact to zinc liquid degree of purity, so as to improve the cleaning quality of coating surface.Its two be as in zinc liquid aluminium content be higher than 0.065%, The filter layer of formation will be partially thick, and iron atom is difficult to appropriate entrance zinc-iron plating, and can not form effective zinc-iron plating. Certainly, aluminium content is less than 0.055% such as in zinc liquid, then Fe2Al5Intermediate layer or filter layer it is too thin, do not reach that appropriate to filter iron former Sub- effect.
Why the present invention quickly heats up to 550 DEG C within less than the 3s times, it is intended that heat needed for solution traditional approach Time longer problem.If the heat time is long, the height of heating furnace（Alloying furnace is vertical heater）, both increase into This, also occupies more space.
The present invention compared with prior art, can ensure steel plate using mechanics and performance, and coating is combined with steel substrate Firmly, on the premise of coating is less prone to efflorescence and obscission and when stamping, moreover it is possible to avoid Si elements and cause steel The defect problems such as plate dew plating.
Description of the drawings
Fig. 1 is the Cross Section Morphology figure of steel plate coating of the present invention.
Specific embodiment
The present invention is described in detail below：
Table 1 is the chemical composition comparative example of various embodiments of the present invention and comparative example；
Table 2 is the main technologic parameters comparative example of various embodiments of the present invention and comparative example；
Table 3 is tensile property and the quality of coating situation list of various embodiments of the present invention and comparative example.
The each case study on implementation of the present invention specifically follows the steps below production：
1）470 DEG C are cooled under 380 DEG C/s of cooling velocity to the steel plate after hot rolling, it is subsequently cold rolling；
2）Continuous hot galvanizing is carried out, and controls zinc pot temperature control at 460 ± 3 DEG C, strip enters zinc pot temperature and controls in 460-485 ℃；Aluminium weight percent content is 0.055 ~ 0.065% in control zinc liquid；
3）After zinc-plated end, steel plate is delivered into zinc-iron DIFFUSION TREATMENT heating furnace conventional heating in the case where Insulation is taken, do not surpassed Cross under conditions of 3s and be heated to 550 DEG C；Holding temperature is controlled at 485 ~ 530 DEG C；
4）Naturally cool to room temperature and stand-by.
The chemical composition various embodiments of the present invention and the chemical composition of comparative example of the various embodiments of the present invention of table 1 and comparative example Comparative example（wt.%）
The main technologic parameters comparative example of the various embodiments of the present invention of table 2 and comparative example
The tensile property and quality of coating situation list of the various embodiments of the present invention of table 3 and comparative example
From table 3 it can be seen that the corresponding excellent in mechanical performance of steel plate of institute's case study on implementation, yield strength, tensile strength and extension Rate is satisfied by corresponding requirements, wherein, yield strength distribution is in 430-443（MPa）, elongation percentage is in 22-24.5（%）, plate layer cross section Iron content is 9.5～10.0（%）, the curved test anti-grinded hardness index of 60 ° of V is at 1 grade, hence it is evident that better than conventional 2 grades.Product is in shaping During there is not efflorescence and obscission.Replace manganese, silicon solid solution strong in particular by the ultrafast cold fine grain refinement technology of hot rolling Change, the yield strength fluctuation range of material is less, material property is more stable, the former fluctuation range is in 16MPa, hence it is evident that less than the latter 33MPa.
And the iron content of control sample is 8.5-8.7（%）, it is larger with the gap of desired value 10.0%；The anti-powdering index of phase Only 2 grades, hence it is evident that less than 1 grade of index of the present invention.
This specific embodiment is only most preferably enumerated, not to the restricted enforcement of technical solution of the present invention.

Claims (2)

1. a kind of yield strength is the iron-zinc coating steel plate of 420MPa levels, and its chemical constituent and weight percent content are：C: 0.10～0.11%, Si：≤ 0.06%, Mn：0.71～0.92%, P≤0.02%, S≤0.012%, Al：0.02～0.05%, Nb： 0.03 ~ 0.04%, it is remaining for Fe and inevitable impurity.
2. a kind of method of the yield strength as claimed in claim 1 for the iron-zinc coating steel plate of 420MPa levels, its feature are produced It is：Its step：
1）470 DEG C are cooled under 380 DEG C/s of cooling velocity to the steel plate after hot rolling, it is subsequently cold rolling；
2）Continuous hot galvanizing is carried out, and controls zinc pot temperature control at 460 ± 3 DEG C, strip enters zinc pot temperature and controls in 460-485 ℃；Aluminium weight percent content is 0.055 ~ 0.065% in control zinc liquid；
3）After zinc-plated end, steel plate is delivered into zinc-iron DIFFUSION TREATMENT heating furnace conventional heating in the case where Insulation is taken, do not surpassed Cross under conditions of 3s and be heated to 550 DEG C；Holding temperature is controlled at 485 ~ 530 DEG C；
4）Naturally cool to room temperature and stand-by.
CN201611177985.0A 2016-12-19 2016-12-19 Iron-zinc plated steel plate with yield strength of 420MPa grade and production method Pending CN106636921A (en)

Priority Applications (1)

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CN201611177985.0A CN106636921A (en) 2016-12-19 2016-12-19 Iron-zinc plated steel plate with yield strength of 420MPa grade and production method

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CN201611177985.0A CN106636921A (en) 2016-12-19 2016-12-19 Iron-zinc plated steel plate with yield strength of 420MPa grade and production method

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101265550A (en) * 2008-04-30 2008-09-17 武汉钢铁(集团)公司 Cold rolling automobile plate for micro-alloy high-strength steel stamping and producing method thereof
JP2008274397A (en) * 2007-03-30 2008-11-13 Jfe Steel Kk High strength hot-dip galvanized steel sheet
CN101812633A (en) * 2009-02-23 2010-08-25 宝山钢铁股份有限公司 Steel used for hot galvanizing structural component with high yield ratio and manufacturing method thereof
WO2013047755A1 (en) * 2011-09-30 2013-04-04 新日鐵住金株式会社 High-strength hot-dip galvanized steel plate having excellent impact resistance and method for producing same, and high-strength alloyed hot-dip galvanized steel sheet and method for producing same
JP2015054990A (en) * 2013-09-12 2015-03-23 Ｊｆｅスチール株式会社 Galvanized steel plate and alloyed galvanized steel plate with superior appearance and plating adhesion, and methods of manufacturing the same
CN105256230A (en) * 2015-11-25 2016-01-20 武汉钢铁(集团)公司 450Mpa-grade thick gauge hot-dip galvanized steel and production method thereof
CN106086633A (en) * 2016-08-26 2016-11-09 武汉钢铁股份有限公司 A kind of yield strength is ferrum zinc coating steel plate and the production method of 210MPa level

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008274397A (en) * 2007-03-30 2008-11-13 Jfe Steel Kk High strength hot-dip galvanized steel sheet
CN101265550A (en) * 2008-04-30 2008-09-17 武汉钢铁(集团)公司 Cold rolling automobile plate for micro-alloy high-strength steel stamping and producing method thereof
CN101812633A (en) * 2009-02-23 2010-08-25 宝山钢铁股份有限公司 Steel used for hot galvanizing structural component with high yield ratio and manufacturing method thereof
WO2013047755A1 (en) * 2011-09-30 2013-04-04 新日鐵住金株式会社 High-strength hot-dip galvanized steel plate having excellent impact resistance and method for producing same, and high-strength alloyed hot-dip galvanized steel sheet and method for producing same
JP2015054990A (en) * 2013-09-12 2015-03-23 Ｊｆｅスチール株式会社 Galvanized steel plate and alloyed galvanized steel plate with superior appearance and plating adhesion, and methods of manufacturing the same
CN105256230A (en) * 2015-11-25 2016-01-20 武汉钢铁(集团)公司 450Mpa-grade thick gauge hot-dip galvanized steel and production method thereof
CN106086633A (en) * 2016-08-26 2016-11-09 武汉钢铁股份有限公司 A kind of yield strength is ferrum zinc coating steel plate and the production method of 210MPa level

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