CN111676350A - 对钢板进行退火的方法 - Google Patents
对钢板进行退火的方法 Download PDFInfo
- Publication number
- CN111676350A CN111676350A CN202010441076.3A CN202010441076A CN111676350A CN 111676350 A CN111676350 A CN 111676350A CN 202010441076 A CN202010441076 A CN 202010441076A CN 111676350 A CN111676350 A CN 111676350A
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- steel sheet
- annealing
- heating zone
- steel
- zone
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 51
- 239000010959 steel Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000000137 annealing Methods 0.000 title claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000001590 oxidative effect Effects 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims abstract description 8
- 239000002344 surface layer Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 29
- 230000003647 oxidation Effects 0.000 claims description 13
- 238000007254 oxidation reaction Methods 0.000 claims description 13
- 238000002791 soaking Methods 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 5
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 3
- 229910001335 Galvanized steel Inorganic materials 0.000 claims 2
- 239000008397 galvanized steel Substances 0.000 claims 2
- 239000003054 catalyst Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 description 8
- 238000005275 alloying Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000005244 galvannealing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- -1 Aluminium Chromium (III) Molybdenum Chemical compound 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- GDJWXDKMRWCHJH-UHFFFAOYSA-N [Si+4].[O-2].[Mn+2].[O-2].[O-2] Chemical compound [Si+4].[O-2].[Mn+2].[O-2].[O-2] GDJWXDKMRWCHJH-UHFFFAOYSA-N 0.000 description 1
- HEURJNZZLSFTDP-UHFFFAOYSA-N [Ti+4].[Nb+5] Chemical compound [Ti+4].[Nb+5] HEURJNZZLSFTDP-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000001912 gas jet deposition Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C—CHEMISTRY; METALLURGY
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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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- 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
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- C22C—ALLOYS
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- 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
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
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- 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
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- 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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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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- 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
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- C23C2/29—Cooling or quenching
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- 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
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
- C23C8/12—Oxidising using elemental oxygen or ozone
- C23C8/14—Oxidising of ferrous surfaces
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- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
- C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
- C23C8/18—Oxidising of ferrous surfaces
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
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- 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
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Abstract
本发明涉及一种对钢板进行退火的方法,该方法包括:第一步骤,该第一步骤包括使该钢板的表面完全氧化,从而形成完全氧化的表面层;第二步骤,该第二步骤包括使该钢的在所述完全氧化的层下方延伸的区域中的除了铁之外的元素选择性氧化,从而形成选择性氧化的内部层;以及第三步骤,该第三步骤包括使所述完全氧化的表面层完全还原。
Description
本申请是申请日为2013年12月10日、国家申请号为201380081409.4(PCT/US2013/074182)、名称为“对钢板进行退火的方法”的中国专利申请的分案申请。
技术领域
本发明涉及对钢板进行退火的方法。更具体地,本发明涉及在热浸涂覆之前并且可能地在镀锌层退火处理之前对钢板进行退火的方法。
背景技术
通过增强机械耐受性(mechanical resistance)以及甚至通过降低密度来使车辆越来越轻量化的需求要求高强度钢具有更加完善的合金化理念。诸如铝、锰、硅和铬之类的合金元素是首选,但是由于在退火后在表面上存在合金元素氧化物而导致可涂覆性方面的严重问题。
在加热期间,钢表面暴露于下述气氛:该气氛对铁而言是非氧化性的,但是对于对氧有较高亲和力的合金元素——诸如锰、铝、硅、铬、碳或硼——而言是氧化性的,这将在表面处产生这些元素的氧化物。当钢包含这种可氧化的元素时,这些元素趋于在钢的表面处选择性地氧化,从而削弱后续涂覆的润湿性。
此外,当该涂层是被进一步热处理以进行镀锌层退火处理的热浸涂覆钢板时,这种氧化物的存在可能削弱铁在涂层中的扩散,从而不能在工业生产线的传统的生产线速度下被充分地合金化。
发明内容
本发明提供了一种对钢板进行退火的方法,该方法包括:
-第一步骤,第一步骤包括使该钢板的表面完全氧化,从而形成完全氧化的表面层;
-第二步骤,第二步骤包括使所述钢的在所述完全氧化的层下方延伸的区域中的除了铁之外的元素选择性氧化,从而形成选择性氧化的内部层;以及
-第三步骤,第三步骤包括使所述完全氧化的表面层完全还原。
在第一实施方式中,该方法可以在包括直接火焰加热区、辐射管加热区和辐射管均热区的设备中进行,第一步骤在直接加热区中进行,第二步骤至少在辐射管加热区中进行以及第三步骤至少在辐射管均热区中进行。第一步骤可以通过将直接火焰加热区的气氛调整成大于1的空气/燃气比而进行。
在另一实施方式中,该方法可以在包括辐射管预热区、辐射管加热区和辐射管均热区的设备中进行,第一步骤在辐射管预热区中进行,第二步骤至少在辐射管加热区中进行以及第三步骤至少在辐射管均热区中进行。第一步骤可以在包含按体积计0.1%到10%的量的O2、优选地包含按体积计0.5%到3%的量的O2的氧化室中进行。替代性地或者以结合的方式,该氧化室可以经受水喷射,以使铁氧化。
在另一实施方式中,第二步骤通过根据辐射管加热区的气氛中的H2含量将辐射管加热区中的露点设定成大于临界值而进行。该露点可以通过水汽的喷射来调整。
在另一实施方式中,第三步骤的还原通过利用含按体积计至少2%的H2且其余为N2的气氛来进行。优选的最大H2量为按体积计15%。
根据本发明获得的经退火的钢板能够通过浸入在锌浴中而被热浸涂覆,并且可能地在450℃到580℃的温度下——并且优选地在490℃——被热处理10秒到30秒,以产生所称的镀锌层退火钢板。
对可以根据本发明进行处理的钢的类型没有实际的限制。然而,优选的是,该钢包含按重量计最大4%的锰、按重量计最大3%的硅、按重量计最大3%的铝和按重量计最大1%的铬,以确保钢能够被最佳地涂覆。
在加热期间,钢表面首先暴露于氧化性气氛,这会在表面处形成氧化铁(所称的完全氧化)。该氧化铁防止合金元素在钢表面处被氧化。
该第一步骤可以在用作预热器的直焰炉(direct fire furnace,DFF)中进行。该设备的氧化能力通过将空气/燃气比设定成大于1来调整。
该第一步骤可以替代性地在辐射管式炉(RTF)预热区中进行。特别地,这种RTF预热区可以包括包含氧化性气氛的氧化室。另一替代性方案是将整个预热区设定在以O2和/或H2O作为供氧体的氧化性气氛中。
在产生这种表面氧化层后,进行使除了铁以外的元素选择性氧化的第二步骤。这些元素是钢中包含的能够最容易地氧化的元素,例如锰、硅、铝、硼或铬。该第二步骤通过确保氧气流入到钢板的大部分中来进行,从而引起合金元素的内部选择性氧化。
在本发明的框架中,该氧化可以通过根据RTF加热区的气氛中的H2含量将RTF加热区的露点控制成大于最小值而进行。喷射水汽是可以用于将露点控制到所需值的方法中的一种方法。需注意的是,减小气氛中的H2含量将允许喷射较少的水汽,因为露点也会被降低,但是仍获得了选择性氧化。
在第三步骤中,该完全氧化的层必须被还原,从而确保通过任何种类的涂层——比如磷酸盐、电沉积涂层、包括射流气相沉积涂层(jet vapour deposition coating)的真空涂层、热浸镀锌涂层等——的进一步的涂布性能。这种还原可以在RTF加热区结束时和/或在均热期间和/或在钢板的冷却期间发生。该还原可以利用本领域技术人员已知的传统的还原气氛和方法来进行。
具体实施方式
通过一些非限制性示例的详细公开内容,将能更好地理解本发明。
示例
由具有不同组分——如在表1中汇总——的钢制成的钢板在被冷轧之前以传统的方法生产。钢板随后在包括DFF加热炉、接着是包括两个不同区——即,RTF加热区和RTF均热区——的RTF加热炉的设备中退火。通过设定不同的DFF加热区出口温度以及以不同的速率喷射蒸汽来调整RTF加热区的露点。表2中汇总了退火参数。在均热之后,经退火的钢板通过传统的喷射冷却器进行冷却直到到达480℃的温度为止。
钢板随后被浸入包含按重量计0.130%的铝的锌锅中并且通过在580℃的温度下感应加热10秒而经受镀锌层退火处理。
经涂覆的钢板随后被检验,并且估算出涂层的相应的铁含量。估算值的结果也汇总在表2中。
表1-钢组分
等级 | 碳 | 锰 | 硅 | 铝 | 铬 | 钼 | 钛 | 铌 | 硼 |
A | 0.13 | 2.5 | 0.7 | -- | 0.3 | -- | 0.02 | 0.01 | 0.002 |
B | 0.2 | 1.8 | 2.0 | 0.65 | -- | -- | -- | -- | -- |
C | 0.2 | 2.2 | 2.0 | 0.5 | -- | 0.15 | -- | 0.015 | -- |
表2-退火参数-涂层估算值
ne:未估算
试验1呈现出高反射Gl型的未合金化的表面。利用不充足的露点进行的试验2在整个卷材长度上产生了在整个宽度上明显达一定程度的随机而差别化的合金。露点值在试验3期间被进一步增大。这产生了沿整个卷材长度的完全合金化的带材表面。
根据本发明的方法的另一优点是,通过增大RTF加热区的露点以允许将选择性氧化从外部模式相应地转换成内部模式似乎对钢板的脱碳动力学产生了有利的影响。该优点通过监测到RTF加热区的气氛中减小的一氧化碳(CO)含量而被证实。
Claims (12)
1.一种对钢板进行退火的方法,所述方法包括:
-第一步骤,所述第一步骤包括使所述钢板的表面完全氧化,从而形成完全氧化的表面层;
-第二步骤,所述第二步骤包括使所述钢板的在所述完全氧化的层下方延伸的区域中的除了铁之外的元素选择性氧化,从而形成选择性氧化的内部层,其中,所述第二步骤通过确保氧气流入到钢板的大部分中来进行,其中,所述第二步骤至少在辐射管加热区中进行;以及
-第三步骤,所述第三步骤包括使所述完全氧化的表面层完全还原,其中,所述第三步骤至少在辐射管均热区中进行。
2.根据权利要求1所述的对钢板进行退火的方法,其中,所述方法在包括直接火焰加热区、所述辐射管加热区和所述辐射管均热区的设备中进行,所述第一步骤在所述直接火焰加热区中进行。
3.根据权利要求2所述的对钢板进行退火的方法,其中,所述第一步骤通过将所述直接火焰加热区的气氛调整成大于1的空气/燃气比而进行。
4.根据权利要求1所述的对钢板进行退火的方法,其中,所述方法在包括辐射管预热区、所述辐射管加热区和所述辐射管均热区的设备中进行,所述第一步骤在所述辐射管预热区中进行。
5.根据权利要求4所述的对钢板进行退火的方法,其中,所述第一步骤在包含按体积计0.1%到10%的量的O2的氧化室中进行。
6.根据权利要求2至5中的任一项所述的对钢板进行退火的方法,其中,所述第二步骤通过根据所述辐射管加热区的气氛中的H2含量将所述辐射管加热区的露点设定成大于临界值而进行。
7.根据权利要求6所述的对钢板进行退火的方法,其中,所述露点通过水汽的喷射来调整。
8.根据权利要求1至7中的任一项所述的对钢板进行退火的方法,其中,所述第三步骤的还原通过利用含至少2%的H2且其余为N2的气氛来进行。
9.根据权利要求1至8中的任一项所述的对钢板进行退火的方法,其中,所述钢板的钢包含按重量计达4%的锰、按重量计达3%的硅、按重量计达3%的铝和按重量计达1%的铬。
10.一种生产镀锌钢板的方法,其中,根据权利要求1至9中的任一项获得的经退火的钢板通过浸入锌浴中而被热浸涂覆。
11.一种生产镀锌层退火钢板的方法,其中,根据权利要求10获得镀锌钢板在450℃到580℃的温度下被进一步热处理10秒到30秒。
12.根据权利要求11所述的生产镀锌层退火钢板的方法,其中,所述热处理在低于490℃的情况下进行。
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2013
- 2013-12-10 MX MX2016007417A patent/MX2016007417A/es unknown
- 2013-12-10 US US15/102,118 patent/US10570472B2/en active Active
- 2013-12-10 MA MA39029A patent/MA39029B2/fr unknown
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- 2013-12-10 CN CN201380081409.4A patent/CN105874087A/zh active Pending
- 2013-12-10 EP EP23155333.0A patent/EP4215628A1/en active Pending
- 2013-12-10 WO PCT/US2013/074182 patent/WO2015088501A1/en active Application Filing
- 2013-12-10 BR BR112016012236A patent/BR112016012236A2/pt not_active Application Discontinuation
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- 2013-12-10 JP JP2016538063A patent/JP6356808B2/ja active Active
- 2013-12-10 EP EP13899040.3A patent/EP3080312A4/en active Pending
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EP3080312A1 (en) | 2016-10-19 |
US20160304980A1 (en) | 2016-10-20 |
CN105874087A (zh) | 2016-08-17 |
MX2016007417A (es) | 2016-10-03 |
UA118202C2 (uk) | 2018-12-10 |
US10570472B2 (en) | 2020-02-25 |
WO2015088501A1 (en) | 2015-06-18 |
KR20160085830A (ko) | 2016-07-18 |
MA39029A1 (fr) | 2017-02-28 |
CA2931992C (en) | 2019-01-22 |
CA2931992A1 (en) | 2015-06-18 |
ZA201603165B (en) | 2017-07-26 |
MA39029B2 (fr) | 2019-08-30 |
EP3080312A4 (en) | 2017-09-20 |
BR112016012236A2 (pt) | 2017-08-08 |
JP2017508866A (ja) | 2017-03-30 |
RU2647419C2 (ru) | 2018-03-15 |
EP4215628A1 (en) | 2023-07-26 |
JP6356808B2 (ja) | 2018-07-11 |
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