CN115505854A - 一种镀锌退火钢板 - Google Patents
一种镀锌退火钢板 Download PDFInfo
- Publication number
- CN115505854A CN115505854A CN202211242054.XA CN202211242054A CN115505854A CN 115505854 A CN115505854 A CN 115505854A CN 202211242054 A CN202211242054 A CN 202211242054A CN 115505854 A CN115505854 A CN 115505854A
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- Prior art keywords
- steel sheet
- temperature
- equal
- steel
- galvannealed
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 181
- 239000010959 steel Substances 0.000 title claims abstract description 181
- 238000000034 method Methods 0.000 claims abstract description 60
- 238000005275 alloying Methods 0.000 claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
- 238000001953 recrystallisation Methods 0.000 claims abstract description 16
- 238000005246 galvanizing Methods 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 37
- 239000011701 zinc Substances 0.000 claims description 30
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000007747 plating Methods 0.000 claims description 27
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 26
- 229910052725 zinc Inorganic materials 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 20
- 238000011282 treatment Methods 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 16
- 238000000576 coating method Methods 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 14
- 238000002791 soaking Methods 0.000 claims description 13
- 239000011261 inert gas Substances 0.000 claims description 12
- 229910001566 austenite Inorganic materials 0.000 claims description 11
- 229910004283 SiO 4 Inorganic materials 0.000 claims description 10
- 229910000734 martensite Inorganic materials 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims description 6
- 229910001563 bainite Inorganic materials 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052797 bismuth Inorganic materials 0.000 claims description 4
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 238000000137 annealing Methods 0.000 abstract description 28
- 239000010410 layer Substances 0.000 description 25
- 239000011572 manganese Substances 0.000 description 18
- AMWRITDGCCNYAT-UHFFFAOYSA-L manganese oxide Inorganic materials [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 10
- 239000011651 chromium Substances 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 230000002829 reductive effect Effects 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 238000005097 cold rolling Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005244 galvannealing Methods 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 238000005554 pickling Methods 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000010955 niobium Substances 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 229910052814 silicon oxide Inorganic materials 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- BIIBYWQGRFWQKM-JVVROLKMSA-N (2S)-N-[4-(cyclopropylamino)-3,4-dioxo-1-[(3S)-2-oxopyrrolidin-3-yl]butan-2-yl]-2-[[(E)-3-(2,4-dichlorophenyl)prop-2-enoyl]amino]-4,4-dimethylpentanamide Chemical compound CC(C)(C)C[C@@H](C(NC(C[C@H](CCN1)C1=O)C(C(NC1CC1)=O)=O)=O)NC(/C=C/C(C=CC(Cl)=C1)=C1Cl)=O BIIBYWQGRFWQKM-JVVROLKMSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910006639 Si—Mn Inorganic materials 0.000 description 1
- 229910001035 Soft ferrite Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- PPNAOCWZXJOHFK-UHFFFAOYSA-N manganese(2+);oxygen(2-) Chemical class [O-2].[Mn+2] PPNAOCWZXJOHFK-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000682 scanning probe acoustic microscopy Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical class [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
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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
- 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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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- C—CHEMISTRY; METALLURGY
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
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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
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- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
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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
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- 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
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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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- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
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- C21D9/573—Continuous furnaces for strip or wire with cooling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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Abstract
本发明涉及用于制造镀锌退火钢板的方法,所述方法包括提供特定钢板、再结晶退火、热浸镀锌和合金化处理;所述镀锌退火钢板;和所述镀锌退火钢板的用途。
Description
本发明专利申请是申请日为2018年10月19日、申请号为201880071328.9、发明名称为“一种镀锌退火钢板”的发明专利申请的分案申请。
本发明涉及用于制造镀锌退火钢板的方法和镀锌退火钢板。本发明特别适用于汽车工业。
为了减轻车辆的重量,已知使用高强度钢来制造机动车辆。例如,为了制造结构零部件,必须改善这种钢的机械特性。已知添加合金元素以改善钢的机械特性。因此,生产并使用具有高机械特性的高强度钢或超高强度钢,包括TRIP(相变诱发塑性)钢、DP(双相)钢、HSLA(高强度低合金)、TRIPLEX、DUPLEX。
通常,DP钢具有铁素体-马氏体显微组织。这产生由包含马氏体岛作为第二相(马氏体使拉伸强度提高)的软铁素体基体组成的显微组织。除钢的化学组成之外,DP钢的整体性能还受相的体积分数和形态(晶粒尺寸、外观、比例等)等控制。DP钢具有高极限拉伸强度(UTS,通过马氏体实现)、以及低初始屈服应力(由铁素体相提供)和高早期应变硬化。这些特性使DP钢成为与汽车相关的板材成型操作的理想材料。
它们的优点是:低屈服强度、低屈服与拉伸强度比、高初始应变硬化率、良好的均匀伸长、高应变率敏感性和良好的抗疲劳性。
通常,这些钢涂覆有改善诸如耐蚀性、可磷化性等特性的金属镀层。金属镀层可以在钢板的退火之后通过热浸镀锌来沉积。有时,接着进行合金化处理,使得钢板中的铁向锌镀层扩散,以在钢板上获得锌-铁合金,称为镀锌退火钢板。该镀锌退火钢板具有良好的焊接性能。
然而,特别是对于DP钢,在连续退火线中进行的退火期间,对氧具有更高亲合性(与铁相比)的合金元素例如锰(Mn)、铝(Al)、硅(Si)或铬(Cr)等氧化并导致在表面形成氧化物。这些氧化物为例如锰氧化物(MnO)或硅氧化物(SiO2),其可以以连续膜或非连续膜的形式存在于钢板表面上。它们妨碍待施加的金属镀层的适当附着,并且可能产生最终产品上没有镀层的区域或者与镀层分层相关的问题。
对DP钢进行镀锌扩散退火是一项艰巨的任务,因为在退火期间形成在钢板上的氧化物可能干扰Fe-Zn的形成。实际上,形成的氧化物可能延迟镀锌扩散退火,原因是铁扩散受到干扰。镀锌扩散退火取决于氧化物在钢板表面处、钢板中的分布;氧化物的形态;以及有时所形成的氧化物的性质等。
专利申请EP2415896公开了一种用于制造高强度镀锌退火钢板的方法,所述钢板包括设置在钢板上的单位面积的质量为20g/m2至120g/m2锌镀层,基于质量,所述钢板含有0.01%至0.18%的C、0.02%至2.0%的Si、1.0%至3.0%的Mn、0.001%至1.0%的Al、0.005%至0.060%的P和0.01%或更少的S,剩余部分为Fe和不可避免的杂质,所述方法包括在连续的镀锌线中对钢板进行退火和镀锌。在加热过程中,在氛围气体露点温度为-5℃或更高的情况下,执行炉温为A℃至B℃的温度区域,其中600≤A≤780且800≤B≤900。对退火炉中除A℃至B℃的区域之外的氛围气体的露点温度没有特别限制,并且优选在-50℃至-10℃的范围内。还公开了一种方法,该方法还包括通过在镀锌之后将钢板加热到450℃至600℃的温度对钢板进行合金化,使得镀锌层中的Fe含量在7重量%至15重量%的范围内。
通过上述方法获得的镀锌退火钢板具有这样的结构或显微组织,其中在紧挨镀锌层的下部且距基础钢板表面100μm以内的钢板表面部分中,以每单位面积0.010g/m2至0.50g/m2形成选自Fe、Si、Mn、Al、P、B、Nb、Ti、Cr、Mo、Cu和Ni中的至少一者或更多者的氧化物,并且在从镀层向下10μm以内的区域中并且距晶界1μm以内存在的基础金属晶粒中析出结晶的Si氧化物、结晶的Mn氧化物或结晶的Si-Mn复合氧化物。
然而,通过使用上述方法,存在在钢板表面形成重要的外部氧化物(如FeO)的层的风险。在这种情况下,难以减少全部的外部氧化物,从而导致润湿性差并且锌在钢表面上的镀层附着性差,并且在合金化处理期间,存在铁向锌镀层中的扩散被大大延迟的风险。因此,在这种情况下,不希望进行合金化处理以获得镀锌退火钢板。
专利申请JP2008156734公开了一种用于制造高强度热浸镀锌退火钢板的方法,该方法包括:
-对由权利要求1或2中所述的组分构成的钢进行热轧、酸洗和冷轧,并对所得钢板进行热浸镀锌处理以制造热浸镀锌退火钢板,其中
-在热轧中,将板坯加热温度设定为1150℃至1300℃,将终轧温度设定为850℃至950℃,将卷取温度设定为400℃至600℃;
-在酸洗中,将浴温度设定为10℃或更高且低于100℃,并且将盐酸的浓度设定为1%至20%;以及
在热浸镀锌处理中,将由升温过程至600℃或更高、经由退火温度、到冷却过程至450℃的热处理炉中的氛围气体中的氢浓度设定为2%至20%,将氛围气体的露点设定为-60℃至-10℃,将冷轧钢板在760℃至860℃的退火温度下保持10秒至500秒,然后以1℃/秒至30℃/秒的平均冷却速率冷却。该方法还可以包括在450℃至600℃的温度范围内进行10秒至120秒的合金化处理以获得镀锌退火钢板。
提到了在钢板的内部,在晶粒边界和晶粒中形成了基于Si和基于Mn的氧化物。
然而,在实施例中,未提及合金化处理时间。并且,由于氧化物靠近钢板表面,因此具有以下风险:这样的氧化物的存在在钢板中形成不连续的氧化物膜,从而抑制铁向锌镀层的扩散。因此,存在使合金化处理延迟的风险。
专利申请JP2000212648公开了一种用于生产具有优异的加工性和镀层粘附性的高强度热浸镀锌退火钢板的一步法,该方法包括以下步骤:
-对包含0.10重量%或更少的P的钢坯进行热轧,然后进行酸洗,或对钢板进行冷轧;
-在以下氛围气体中进行加热:其中加热温度T为750℃或更高且1000℃或更低并且满足下式(2),氛围气体气体的露点t满足下式(3),并且氛围气体气体的氢浓度为1体积%至100体积%;然后进行热浸镀锌:
0.85≤{[P(重量%)+(2/3)]*1150}/{T(℃)}≤1.15 (2);
0.35≤{[P(重量%)+(2/3)]*(-30)}/{t(℃)}≤1.8 (3)。
该方法还公开了进一步的合金化处理以获得镀锌退火钢板。
其中进行一步热处理法的JP2000212648的所有实施例(实施例18至26)包括热还原处理,其中加热温度T为810℃至850℃,且露点为非常干燥(≤-35℃)或非常潮湿(≥35℃),允许实现镀层附着。在750℃至1000℃的热还原处理之后进行合金化处理。
JP2000212648的一步法的唯一比较例(比较例10)是用Si和Cr的量非常少的钢板进行的。在这种情况下,一步热处理法包括热还原处理,其中加热温度T为820℃且露点为0℃。随后在480℃下进行合金化处理。然而,基于P的氧化物没有被还原,导致合金化之后不良的镀层附着性和不良的外观。
专利申请JP2011117040公开了一种合金化热浸镀锌退火钢板,其包括:钢板基材,该钢板基材的化学组成按质量%计包含0.01%至0.25%的C、0.3%至2.0%的Si、0.030%至3.0%的Mn、0.050%或更少的P、0.010%或更少的S、0.0060%或更少的N、和0.5%或更少的溶胶Al,余量为Fe和杂质;以及在所述钢板基材的表面上的镀层,该镀层按质量%计包含8.0%至15%的Fe和0.15%至0.50%的Al,其中所述钢板还包含Si、Mn或Al的单一氧化物;含有这些中的两种或更多种的氧化物;或者含有这些中的两种或更多种与Fe的复合氧化物,其中单一氧化物、氧化物或复合氧化物存在于钢板基材中距镀层与钢板基材之间的界面的2μm深度以内,并且单一氧化物、氧化物或复合氧化物的最大晶粒直径为0.10μm或更小。
还公开了一种用于制造合金化热浸镀锌退火钢板的方法,该方法包括:
-热轧步骤,对钢坯进行热轧并在650℃或更低的卷取温度下对获得的热轧钢板进行卷取,所述钢坯的化学组成按质量%计包含:0.01%至0.25%的C、0.3%至2.0%的Si、0.030%至3.0%的Mn、0.050%或更少的P、0.010%或更少的S、0.0060%或更少的N、和0.5%或更少的溶胶Al;
-酸洗步骤,对热轧钢板进行酸洗;
-冷轧步骤,对酸洗步骤中经酸洗的热轧钢板进行冷轧,厚度减小50%或更多;以及
-热浸镀锌步骤,在冷轧步骤后对冷轧钢板依次进行以下处理:在连续热浸镀锌线中的还原退火炉中,在700℃或更高的温度范围内,在氢浓度为1体积%至30体积%且露点为-30℃至10℃的氮-氢氛围气体中进行退火以还原钢板表面;热浸镀锌;以及
-合金化处理。
尽管如此,在退火期间仍可能形成大量性质完全不同的氧化物,包括:Si、Mn或Al的单一氧化物,包含这些中的两种或更多种的氧化物,或者包含这些中的两种或更多种与Fe的复合氧化物。这些氧化物性质,尤其是包含铝和含有这些中的两种或更多种与Fe的复合氧化物的氧化物可能以连续层的形式形成,从而降低镀层附着性并延迟镀锌扩散退火。
专利申请JP2011153367公开了一种用于生产镀锌扩散退火钢的方法,该方法包括对钢板进行退火、热浸镀锌和合金化处理,所述钢板以质量%计包含C:0.03%至0.20%、Mn:0.03%至3.0%、Si:0.1%至2.5%、S:0.01%或更少、P:0.1%或更少、溶胶Al:1.0%或更少、N:0.01%或更少、以及Bi:0.0001%至0.05%,在退火中加热高至再结晶温度时,在至少650℃至再结晶温度的范围内加热期间在退火炉中在露点为-25℃至0℃的情况下进行退火至再结晶温度。
然而,钢中铋的存在可能降低钢的机械特性。此外,存在高强度钢和超高强度钢的镀层附着性降低和延迟镀锌扩散退火的风险。
此外,如专利申请JP2011153367的图1所示,该方法通过用露点为-60℃的N2-10体积%H2气体对炉进行吹扫开始。在加热开始时,将气体变为预定的高露点气体。实际上,当板温度达到650℃时,再次用具有预定露点例如-10℃的高露点气体吹扫炉。此后,当板温度达到等于或高于再结晶温度的860℃时,在浸入镀浴的板的温度达到460℃之前,将气体再次转换为初始低露点气体,即-60℃。
因此,该方法需要三次吹扫:
一次为开始该方法时,用露点为-60℃的气体,
一次为退火期间,当钢板温度达到650℃时,用露点为-10℃的气体,
另一次为退火期间,当钢板温度达到850℃时,用具有-60℃的低露点的气体,
这种方法很难在工业规模上,特别是在连续退火线中进行管理。
因此,除了再结晶退火法外,化学组成和钢显微组织、再结晶退火期间形成的氧化物性质和氧化物配分也是改善DP钢的镀锌扩散退火动力学应考虑的重要特性。
因此,需要找到一种方法来改善高强度钢和超高强度钢,特别是包含一定量合金元素的DP钢的润湿性和镀层附着性。
因此,本发明的目的是提供一种具有包含合金元素的化学组成的镀锌退火钢板,其中减少了合金化处理时间从而允许实现工业实施。另一个目的是获得具有高品质(即,铁在钢中的扩散充分进行)的镀锌退火钢板。最后,目的是提供一种易于实施的制造所述镀锌退火钢板的方法。
该目的通过提供根据权利要求1所述的方法来实现。该方法还可以包括根据权利要求2至13所述的任何特征。
另一个目的通过提供根据权利要求14所述的镀锌退火钢板来实现。该镀锌退火钢板还可以包括根据权利要求15至17所述的任何特征。
最后,目的通过提供根据权利要求18所述的镀锌退火钢板的用途来实现。
通过以下对本发明的详细描述,本发明的其他特征和优点将变得明显。
为了说明本发明,将特别地参考以下附图描述非限制性实例的多种实施方案和试验:
图1示出了专利申请JP2011153367中公开的现有技术的一种方法。
图2示出了根据本发明的方法的一个实例。
将定义以下术语:
-“体积%”意指体积百分比,
-“重量%”意指重量百分比。
本发明涉及一种用于制造镀锌退火钢板的方法,该方法包括:
A.提供钢板,所述钢板按重量百分比计具有以下化学组成:
0.05≤C≤0.20%.
1.5≤Mn≤3.0%.
0.10≤Si≤0.45%,
0.10≤Cr≤0.60%,
Al≤0.20%,
V<0.005%
以及在完全任选的基础上,诸如以下的一种或更多种元素:
P<0.04%,
Nb≤0.05%,
B≤0.003%,
Mo≤0.20%.
Ni≤0.1%.
Ti≤0.06%,
S≤0.01%
Cu≤0.1%,
Co≤0.1%.
N≤0.01%,
所述组成的剩余部分由铁和由加工产生的不可避免的杂质构成;
B.在包括加热段、均热段、冷却段、任选地均衡段的全辐射管式炉中对所述钢板进行再结晶退火,所述再结晶退火包括以下子步骤:
i.在具有氛围气体A1的加热段中将所述钢板从环境温度加热到700℃至900℃的温度T1,所述氛围气体A1包含0.1体积%至15体积%的H2和惰性气体,其露点DP1为-18℃至+8℃,
ii.在具有氛围气体A2的均热段中将钢板从T1均热到700℃至900℃的温度T2,所述氛围气体A2与A1相同且具有等于DP1的露点DP2,
iii.在具有氛围气体A3的冷却段中将钢板从T2冷却到400℃至700℃的T3,所述氛围气体A3包含1体积%至30体积%的H2和惰性气体,其露点DP3低于或等于-30℃,
iv.任选地,在具有氛围气体A4的均衡段中将钢板从温度T3均衡到400℃至700℃的温度T4,所述氛围气体A4包含1体积%至30体积%的H2和惰性气体,其露点DP4低于或等于-30℃;
以及
C.在锌浴中对经退火的钢板进行热浸镀锌;以及
D.在460℃至600℃的温度T5下在1秒至45秒的时间t5期间进行合金化处理。
不希望受任何理论的束缚,似乎根据本发明的方法允许高度改善具有特定化学组成的钢板的润湿性和镀层附着性。另外,利用根据本发明的方法,可以以减少的时间进行合金化处理。实际上,与诸如JP2011153367公开的方法(图1)的现有技术方法相反,并且如图2所示,发明人发现,根据本发明的再结晶退火在全辐射管式炉(RTF)中进行,在所述全辐射管式炉中加热段和均热段具有DP为-18℃至+8℃的相同氛围气体,这种氛围气体包含0.1体积%至15体积%的H2允许生产具有特定氧化物配分(允许实现高润湿性并且具有高品质)的镀锌退火钢板。特别地,在再结晶退火期间在钢板表面和内部形成包括MnO、FeO和Mn2SiO4的氧化物,这允许实现高润湿性和镀层附着性。优选地,这些外部氧化物以结节的形式存在于板表面。因此,在合金化处理期间,钢中的铁可以容易地以减少的时间向镀层中扩散。
如果不根据本发明对上述特定钢板进行再结晶退火,特别是如果加热段和均热段不具有相同的氛围气体,并且如果露点低于-18℃,则存在这样的风险:形成诸如MnO、FeO和Mn2SiO4的氧化物,这些氧化物主要或仅在外部。此外,还存在这些氧化物在钢板表面形成厚的连续层的风险,这会显著降低钢板的润湿性。在这种情况下,不希望进行合金化处理以获得镀锌退火钢板。
此外,如果加热段和均热段不具有相同的氛围气体,并且如果露点高于8℃,则存在形成诸如MnO和FeO的外部氧化物以及诸如Mn2SiO4的内部氧化物的风险。特别地,存在在钢板表面以连续层的形式形成MnO和主要为FeO的风险,从而使钢板的润湿性降低。在这种情况下,不希望进行合金化处理以获得镀锌退火钢板。
关于钢的化学组成,碳量为0.05%至0.20重量%。如果碳含量低于0.050%,则存在拉伸强度不足的风险。此外,如果钢显微组织包含残余奥氏体,则可能无法获得实现足够的伸长率所必需的稳定性。在一个优选实施方案中,碳含量在0.05%至0.15%的范围内。
锰为固溶硬化元素,其有助于获得高拉伸强度。当Mn含量为至少1.5重量%时,获得这种效果。然而,高于3.0%,Mn的添加可能促成形成具有过于明显的偏析带的结构,这可能不利地影响焊缝的机械特性。优选地,锰含量在1.5%至2.9%的范围内以实现这些效果。这使得可以获得令人满意的机械强度而不增加钢的工业制造难度并且不增加焊缝的淬透性。
硅必须为0.1%至0.45%,优选0.1%至0.30%,更优选0.1%至0.25%,以获得所需的机械特性和可焊性的组合:由于硅在渗碳体中溶解度低,并且由于该元素使奥氏体中碳的活性增加的事实,硅减少了在板的冷轧之后退火期间碳化物的析出。似乎是如果Si的量高于0.45%,则在钢板表面处形成其他氧化物,降低润湿性和镀层附着性。
铝必须低于或等于0.20重量%,优选低于0.18重量%。对于残余奥氏体的稳定化,铝的影响与硅的比较相似。然而,铝含量高于0.20重量%将使Ac3温度(即在退火步骤期间钢中完全转变为奥氏体的温度)升高,因此将使工业过程更昂贵。
铬使得可以在退火循环期间在保持在最高温度之后的冷却步骤中延迟先共析铁素体的形成,使得可以实现更高的强度水平。因此,出于成本和防止过度硬化的原因,铬含量为0.10重量%至0.60重量%,优选0.10重量%至0.50重量%。
钒在本发明的范围中也起重要作用。根据本发明,V的量低于0.005%,并且优选0.0001%≤V≤0.005%。优选地,V形成实现硬化和强化的析出物。
钢可以任选地包含实现析出硬化的元素如P、Nb、B、Mo、Ni、Ti、S、Cu、Co、N。
P和S被认为是炼钢产生的残留元素。P可以以<0.04重量%的量存在。S可以以低于或等于0.01重量%的量存在。
钛和铌也是可以任选地用于通过形成析出物来实现硬化和强化的元素。然而,当Nb量大于0.05%和/或Ti含量大于0.06%时,存在过度析出可能导致韧性降低的风险,这必须避免。
钢还可以任选地以低于或等于0.003%的量包含硼。通过在晶界处偏析,B使晶界能降低,并因此有益于提高抗液态金属脆化性。
量低于或等于0.2%的钼对于提高淬透性和使残余奥氏体稳定是有效的,因为该元素使奥氏体的分解延迟。
钢可以任选地包含镍,其量低于或等于0.1%以改善韧性。
铜可以以低于或等于0.1%的含量存在,以通过铜金属的析出使钢硬化。
优选地,钢的化学成组成不包含铋(Bi)。实际上,不希望受任何理论的束缚,认为如果钢板包含Bi,则润湿性降低,并因此镀层附着性降低。
优选地,在步骤B.i)和B.ii)中,A1包含1体积%至10体积%的H2,并且更优选地,A1包含2体积%至8体积%之间的H2,A2与A1相同。
有利地,在步骤B.i)和B.ii)中,DP1为-15℃至+5℃,并且更优选地,DP1为-10℃至+5℃,DP2等于DP1。
在一个优选实施方案中,在步骤B.i)中,将钢板从环境温度加热到T1,加热速率大于1℃/秒,例如为2℃/秒至5℃/秒。
优选地,在步骤B.i)中,在时间t1期间进行加热,t1为1秒至500秒,并且有利地1秒至300秒。
有利地,在步骤B.ii)中,在时间t2期间进行均热,t2为1秒至500秒,并且有利地1秒至300秒。
优选地,在步骤B.ii)中,T2等于T1。在这种情况下,在步骤B.i)和B.ii)中,T1和T2为750℃至850℃,T2等于T1。在另一个实施方案中,取决于钢板的化学组成和显微组织,T2可以低于或高于T1。在这种情况下,在步骤B.i)和B.ii)中,T1和T2彼此独立地为750℃至850℃。
优选地,在步骤B.iii)中,A3包含1重量%至20重量%的H2,并且更优选地,1重量%至10重量%的H2。
优选地,在步骤B.iii)中,DP3低于或等于-35℃。
在一个优选实施方案中,在步骤B.iii)中,在1秒至50秒的时间t3期间进行冷却。
有利地,在步骤B.iii)中,冷却速率大于10℃/秒,并且优选为15℃/秒至40℃/秒。
有利地,在步骤B.iv)中,A4包含1重量%至20重量%,并且更优选1重量%至10重量%的H2。
优选地,在步骤B.iv)中,DP4低于或等于-35℃。
在一个优选实施方案中,在步骤B.iv)中,在时间t4期间进行均衡,t4为1秒至100秒,例如20秒至60秒。
有利地,在步骤B.iii)和B.iv)中,A3与A4相同,DP4等于DP3。
优选地,在步骤B.iv)中,T4等于T3。在这种情况下,在步骤B.iii)和B.iv)中,T3和T4为400℃至550℃或550℃至700℃,T4等于T3。在另一个实施方案中,取决于钢板的化学组成和显微组织,T4可以低于或高于T3。在这种情况下,在步骤B.iii)和B.iv)中,T3和T4彼此独立地为400℃至550℃或550℃至700℃。
优选地,在步骤B.i)至B.iv)中,惰性气体选自:N2、Ar、He和Xe。
优选地,在步骤C)中,锌基镀层包含0.01重量%至0.4重量%的Al,余量为Zn。
有利地,在步骤D)中,T5为470℃至570℃,更优选470℃至530℃。
优选地,在步骤D)中,t5为1秒至35秒,例如1秒至20秒。
在一个优选实施方案中,合金化处理在包含空气的氛围气体A5中进行。
本发明还涉及一种镀锌退火钢板,其中通过使铁从钢板扩散而使锌镀层合金化,使得锌镀层包含:5重量%至15重量%的Fe;包括FeO、Mn2SiO4和MnO的氧化物;余量为锌,钢板包含在钢板中的包括FeO、Mn2SiO4和MnO的内部氧化物。优选地,存在于锌镀层或镀铝层中的包括FeO、Mn2SiO4和MnO的内部氧化物为结节的形式。
优选地,镀层的厚度为1μm至15μm。
优选地,钢显微组织包含贝氏体、马氏体、铁素体和任选地奥氏体。在一个优选实施方案中,钢显微组织包含1%至45%的马氏体、1%至60%的贝氏体,余量为奥氏体。在另一个优选实施方案中,钢显微组织包含1%至25%的新鲜马氏体、1%至10%的铁素体、35%至95%的马氏体和下贝氏体、和少于10%的奥氏体。
在一个优选实施方案中,钢板的表面为脱碳的。优选地,距钢板表面的脱碳深度为多至100μm,优选地多至80μm。在这种情况下,不希望受任何理论的束缚,认为由于钢板中的碳量降低,钢板具有更好的抗LME性。实际上,碳似乎是对液态金属脆化(liquid metalembrittlement)LME高度敏感的元素。此外,更好的可弯曲性和更好的碰撞性能。
最后,本发明涉及镀锌退火钢板用于制造机动车辆零部件的用途。
现在将在仅用于提供信息而进行的试验中说明本发明。它们是非限制性的。
实施例
在该实施例中,使用按重量百分比计具有以下组成的DP钢。
C | Mn | Si | Cr | Al | Mo | Ti | P | S | Cu | Ni | Nb | V | B | N |
0.072 | 2.52 | 0.255 | 0.30 | 0.15 | 0.1 | 0.017 | 0.013 | 0.001 | 0.015 | 0.021 | 0.025 | 0.004 | 0.0020 | 0.006 |
根据表1的条件,对为DP钢的所有试样在全RTF炉中从环境温度开始进行退火。
然后,对所有试样在含有0.117%的铝的锌浴中进行热浸涂。
在镀层沉积之后,通过肉眼、扫描电子显微镜和俄歇光谱对试样进行分析。对于润湿性,0意指镀层连续沉积,1意指镀层不连续沉积。当润湿性为0,即非常好时,对试样进行合金化以获得镀锌退火钢板。当润湿性为1,即非常差时,由于在钢板表面上存在大量不期望的氧化物,镀层的品质非常差,因此不需要合金化。
结果显示在下表1中。
根据本发明的试验4至7以及实施例11和12示出了良好的润湿性。然而,对于试验4至7,与试验11和12相比,合金化时间显著减少。此外,对于根据本发明的实施例,镀层的表面外观明显良好。
根据本发明的实施例,还提供了以下附记:
1.一种用于制造镀锌退火钢板的方法,包括:
A.提供钢板,所述钢板按重量百分比计具有以下化学组成:
0.05≤C≤0.20%,
1.5≤Mn≤3.0%,
0.10≤Si≤0.45%,
0.10≤Cr≤0.60%,
Al≤0.20%,
V<0.005%
以及可选择地包含的以下一种或更多种元素:
P<0.04%,
Nb≤0.05%,
B≤0.003%.
Mo≤0.20%,
Ni≤0.1%,
Ti≤0.06%.
S≤0.01%
Cu≤0.1%,
Co≤0.1%,
N≤0.01%,
所述组成的剩余部分由铁和由加工产生的不可避免的杂质构成;
B.在包括加热段、均热段、冷却段、可选择地包含的均衡段的全辐射管式炉中对所述钢板进行再结晶退火,所述再结晶退火包括以下子步骤:
i.在具有氛围气体A1的所述加热段中将所述钢板从环境温度加热到700℃至900℃的温度T1,所述氛围气体A1包含0.1体积%至15体积%的H2和惰性气体,该氛围气体的露点DP1为-18℃至+8℃,
ii.在具有氛围气体A2的所述均热段中将所述钢板从T1均热到700℃至900℃的温度T2,所述氛围气体A2与A1相同且具有等于DP1的露点DP2,
iii.在具有氛围气体A3的所述冷却段中将所述钢板从T2冷却到400℃至700℃的T3,所述氛围气体A3包含1体积%至30体积%的H2和惰性气体,其露点DP3低于或等于-30℃,
iv.可选择地包含的子步骤:在具有氛围气体A4的所述均衡段中将所述钢板从温度T3均衡到400℃至700℃的温度T4,所述氛围气体A4包含1体积%至30体积%的H2和惰性气体,其露点DP4低于或等于-30℃;以及
C.在锌浴中对经退火的钢板进行热浸镀锌;以及
D.在460℃至600℃的温度T5下在1秒至45秒的时间t5期间进行合金化处理。
2.根据附记1所述的方法,其中在步骤A)中,所述钢板包含少于0.30重量%的Si。
3.根据附记1或2所述的方法,其中在步骤A)中,所述钢板包含多于0.0001重量%的V。
4.根据附记1至3中任一项所述的方法,其中在步骤B.i)和B.ii)中,A1包含1体积%至10体积%的H2,A2与A1相同。
5.根据附记1至4中任一项所述的方法,其中在步骤B.i)和B.ii)中,DP1为-15℃至+5℃,DP2等于DP1。
6.根据附记1至5中任一项所述的方法,其中在步骤B.ii)中,T2等于T1。
7.根据附记1至6中任一项所述的方法,其中在步骤B.i)和B.ii)中,T1和T2为750℃至850℃。
8.根据附记1至7中任一项所述的方法,其中在步骤B.iii)和可选择地包含的子步骤B.iv)中,A3与A4相同,DP4等于DP3。
9.根据附记1至8中任一项所述的方法,其中在步骤B.i)至B.iii)和可选择地包含的子步骤B.iv)中,所述惰性气体选自:N2、Ar、He和Xe。
10.根据附记1至9中任一项所述的方法,其中锌基镀层包含0.01重量%至0.4重量%的Al,余量为Zn。
11.根据附记1至10中任一项所述的方法,其中在步骤D)中,T5为470℃至570℃。
12.根据附记1至11中任一项所述的方法,其中在步骤D)中,t5为1秒至35秒。
13.根据附记1至12中任一项所述的方法,其中钢的化学组成不包含铋(Bi)。
14.一种由根据附记1至13中任一项所述的方法获得的镀锌退火钢板,其中通过使铁从所述钢板扩散而使锌镀层合金化,使得所述锌镀层包含5重量%至15重量%的Fe;包括FeO、Mn2SiO4和MnO的氧化物;余量为锌,所述钢板包含在所述钢板中的包括FeO、Mn2SiO4和MnO的内部氧化物。
15.根据附记14所述的镀锌退火钢板,其中存在于所述锌镀层中的氧化物为结节状。
16.根据附记15所述的镀锌退火钢板,其中钢显微组织包含贝氏体、马氏体、铁素体和任选地奥氏体。
17.根据附记14至16中任一项所述的镀锌退火钢板,其中所述钢板的表面为脱碳的。
18.根据附记14至17中任一项所述的镀锌退火钢板或由根据附记1至13中任一项所述的方法获得的镀锌退火钢板用于制造机动车辆零部件的用途。
Claims (17)
1.一种用于制造镀锌退火钢板的方法,包括:
A.提供钢板,所述钢板按重量百分比计具有以下化学组成:
0.05≤C≤0.20%,
1.5≤Mn≤3.0%,
0.10≤Si≤0.45%,
0.10≤Cr≤0.60%,
Al≤0.20%,
V<0.005%
以及可选择地包含的以下一种或更多种元素:
P<0.04%,
Nb≤0.05%,
B≤0.003%,
Mo≤0.20%,
Ni≤0.1%,
Ti≤0.06%,
S≤0.01%
Cu≤0.1%.
Co≤0.1%,
N≤0.01%,
所述组成的剩余部分由铁和由加工产生的不可避免的杂质构成;
B.在包括加热段、均热段、冷却段、可选择地包含的均衡段的全辐射管式炉中对所述钢板进行再结晶退火,所述再结晶退火包括以下子步骤:
i.在具有氛围气体A1的所述加热段中将所述钢板从环境温度加热到700℃至900℃的温度T1,所述氛围气体A1包含0.1体积%至15体积%的H2和惰性气体,该氛围气体的露点DP1为-18℃至+8℃,
ii.在具有氛围气体A2的所述均热段中将所述钢板从T1均热到700℃至900℃的温度T2,所述氛围气体A2与A1相同且具有等于DP1的露点DP2,
iii.在具有氛围气体A3的所述冷却段中将所述钢板从T2冷却到400℃至700℃的T3,所述氛围气体A3包含1体积%至30体积%的H2和惰性气体,其露点DP3低于或等于-30℃,
iv.可选择地包含的子步骤:在具有氛围气体A4的所述均衡段中将所述钢板从温度T3均衡到400℃至700℃的温度T4,所述氛围气体A4包含1体积%至30体积%的H2和惰性气体,其露点DP4低于或等于-30℃;
在步骤B.i)至B.iii)和可选择地包含的子步骤B.iv)中,所述惰性气体选自:N2、Ar、He和Xe;以及
C.在锌浴中对经退火的钢板进行热浸镀锌;以及
D.在460℃至600℃的温度T5下在1秒至45秒的时间t5期间进行合金化处理。
2.根据权利要求1所述的方法,其中在步骤A)中,所述钢板包含少于0.30重量%的Si。
3.根据权利要求1或2所述的方法,其中在步骤A)中,所述钢板包含多于0.0001重量%的V。
4.根据权利要求1至3中任一项所述的方法,其中在步骤B.i)和B.ii)中,A1包含1体积%至10体积%的H2,A2与A1相同。
5.根据权利要求1至4中任一项所述的方法,其中在步骤B.i)和B.ii)中,DP1为-15℃至+5℃,DP2等于DP1。
6.根据权利要求1至5中任一项所述的方法,其中在步骤B.ii)中,T2等于T1。
7.根据权利要求1至6中任一项所述的方法,其中在步骤B.i)和B.ii)中,T1和T2为750℃至850℃。
8.根据权利要求1至7中任一项所述的方法,其中在步骤B.iii)和可选择地包含的子步骤B.iv)中,A3与A4相同,DP4等于DP3。
9.根据权利要求1至8中任一项所述的方法,其中锌基镀层包含0.01重量%至0.4重量%的Al,余量为Zn。
10.根据权利要求1至9中任一项所述的方法,其中在步骤D)中,T5为470℃至570℃。
11.根据权利要求1至10中任一项所述的方法,其中在步骤D)中,t5为1秒至35秒。
12.根据权利要求1至11中任一项所述的方法,其中钢的化学组成不包含铋(Bi)。
13.一种由根据权利要求1至12中任一项所述的方法获得的镀锌退火钢板,其中通过使铁从所述钢板扩散而使锌镀层合金化,使得所述锌镀层包含5重量%至15重量%的Fe;包括FeO、Mn2SiO4和MnO的氧化物;余量为锌,所述钢板包含在所述钢板中的包括FeO、Mn2SiO4和MnO的内部氧化物。
14.根据权利要求13所述的镀锌退火钢板,其中存在于所述锌镀层中的氧化物为结节状。
15.根据权利要求14所述的镀锌退火钢板,其中钢显微组织包含贝氏体、马氏体、铁素体和任选地奥氏体。
16.根据权利要求13至15中任一项所述的镀锌退火钢板,其中所述钢板的表面为脱碳的。
17.根据权利要求13至16中任一项所述的镀锌退火钢板或由根据权利要求1至12中任一项所述的方法获得的镀锌退火钢板用于制造机动车辆零部件的用途。
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US11884987B2 (en) | 2024-01-30 |
BR112020006550A2 (pt) | 2020-10-13 |
JP2021502482A (ja) | 2021-01-28 |
MX2020004697A (es) | 2020-07-27 |
KR102374496B1 (ko) | 2022-03-15 |
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HUE056729T2 (hu) | 2022-03-28 |
CA3082061C (en) | 2022-05-31 |
BR112020006550B1 (pt) | 2023-02-23 |
CN111315911A (zh) | 2020-06-19 |
EP3707291B1 (en) | 2021-12-01 |
UA125195C2 (uk) | 2022-01-26 |
JP2023027288A (ja) | 2023-03-01 |
ES2902381T3 (es) | 2022-03-28 |
MA50555A (fr) | 2020-09-16 |
CA3082061A1 (en) | 2019-05-16 |
US20240110257A1 (en) | 2024-04-04 |
US20200354807A1 (en) | 2020-11-12 |
KR20200070293A (ko) | 2020-06-17 |
MA50555B1 (fr) | 2021-12-31 |
RU2739097C1 (ru) | 2020-12-21 |
PL3707291T3 (pl) | 2022-03-28 |
WO2019092467A1 (en) | 2019-05-16 |
EP3707291A1 (en) | 2020-09-16 |
WO2019092527A1 (en) | 2019-05-16 |
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