CN116391057A - 鲜映性优异的高强度镀锌基钢板及其制造方法 - Google Patents
鲜映性优异的高强度镀锌基钢板及其制造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 58
- 239000010959 steel Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title abstract description 12
- 230000008569 process Effects 0.000 title description 8
- 229910001335 Galvanized steel Inorganic materials 0.000 claims abstract description 29
- 239000008397 galvanized steel Substances 0.000 claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 11
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 10
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 7
- 239000000956 alloy Substances 0.000 claims abstract description 7
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000010960 cold rolled steel Substances 0.000 claims description 14
- 238000005275 alloying Methods 0.000 claims description 12
- 238000000137 annealing Methods 0.000 claims description 9
- 238000005098 hot rolling Methods 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 8
- 238000005097 cold rolling Methods 0.000 claims description 7
- 238000005246 galvanizing Methods 0.000 claims description 4
- 238000005554 pickling Methods 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011701 zinc Substances 0.000 abstract description 2
- 229910052725 zinc Inorganic materials 0.000 abstract description 2
- 239000010955 niobium Substances 0.000 description 18
- 239000010936 titanium Substances 0.000 description 17
- 239000006104 solid solution Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 10
- 239000011572 manganese Substances 0.000 description 7
- 229910052719 titanium Inorganic materials 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000001953 recrystallisation Methods 0.000 description 6
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000009864 tensile test Methods 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
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- 238000005204 segregation Methods 0.000 description 3
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
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- 230000003746 surface roughness Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001887 electron backscatter diffraction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000011733 molybdenum Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
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- 230000003014 reinforcing effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- B32B15/00—Layered products comprising a layer of metal
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- 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
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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Abstract
本发明提供一种鲜映性优异的高强度镀锌基钢板及其制造方法。本发明的高强度镀锌基钢板中,以质量%计,包含:C:0.003‑0.005%、Si:0.05%以下、Mn:0.4‑1.0%、P:0.04‑0.06%、S:0.01%以下、N:0.005%以下、S.Al:0.1%以下、Mo:0.05‑0.08%、Ti:0.005‑0.03%、Nb:0.02‑0.035%、Cu:0.06‑0.1%、B:0.0015%以下、余量的Fe和不可避免的杂质,并且C、Ti和Nb满足关系式1,以面积分数计,合金微细组织中的铁素体为95%以上,所述铁素体的晶粒平均尺寸为15μm以下,在1mm×1mm的面积中,5μm以下的超细晶粒具有7‑10%的比例,并且由关系式2定义的△Wsa为0.1以下。
Description
技术领域
本发明涉及一种鲜映性优异且用于汽车轻量化的高强度超低碳钢镀覆钢板及其制造方法,更详细地,涉及一种优选可以用作汽车外板材料的高强度镀锌基钢板及其制造方法。
背景技术
制造商对引擎盖(hood)和车门等汽车的外部面板用涂漆钢部件有严格的要求。这些要求之一涉及涂漆部件的涂漆外观。具有非常优异的涂漆外观的外部面板,即面板反射光而不失真,从而具有产生清晰的反射图像的如镜子的表面时,评价很高。涂漆外观受涂漆的质量和(涂布的)基板的表面的影响。该表面由各种尺寸和规模的平面内结构组成。更小的结构通过表面粗糙度(surface roughness)确认,而更大的结构通过所谓的表面波纹度(surface waviness)确认。
本领域技术人员已知,更大的表面结构,例如,表面波纹度是通过不同的涂漆层来传导。因此,在外部涂漆层的表面仍然存在一定程度的(涂布的)基板表面的波纹度。此外,近年来,汽车制造商欲通过在涂装工艺中省略中涂来节省能源和降低成本,因此汽车表面波纹度变得越来越重要。重要的是认识到,需要在应用压制或成型后测量表面波纹度。
本领域技术人员已知,成型的部分的表面波纹度是未变形的部分,例如平坦的部分的表面波纹度和通过成型步骤引入的波纹度增加的结果。成型部分的波纹度和非变形部分的波纹度之差由Δ波纹度(delta Waviness)表示,例如由ΔWsa表示。
(现有技术文献)
(专利文献1)韩国专利申请号2013-0160369号
发明内容
要解决的技术问题
本发明的目的在于提供一种高强度热浸镀锌钢板及其制造方法,其中,通过在应用于需要成型性的汽车外板的超低碳钢中添加P、Nb和Ti来控制粒度(grain size)分布,从而所述高强度热浸镀锌钢板具有优异的鲜映性。
另外,本发明的技术问题并不限定于上述内容。可以从本说明书的全部内容理解本发明的技术问题,本发明所属技术领域的技术人员在理解本发明的附加的技术问题方面没有任何困难。
技术方案
本发明的一个方面涉及一种表面鲜映性优异的高强度热浸镀锌钢板,以质量%计,所述钢板包含:C:0.003-0.005%、Si:0.05%以下、Mn:0.4-1.0%、P:0.04-0.06%、S:0.01%以下、N:0.005%以下、S.Al:0.1%以下、Mo:0.05-0.08%、Ti:0.005-0.03%、Nb:0.02-0.035%、Cu:0.06-0.1%、B:0.0015%以下、余量的Fe和不可避免的杂质,并且C、Ti和Nb满足以下关系式1,以面积分数计,合金微细组织中的铁素体为95%以上,所述铁素体的晶粒平均尺寸为15μm以下,在1mm×1mm的面积中,5μm以下的超细晶粒具有7-10%的比例,并且由以下关系式2定义的△Wsa为0.1以下。
[关系式1]
0.03≤[(Nb(48/93))+(Ti(93/48))+(C(12/48))]≤0.04
[关系式2]
△Wsa=5%变形后的钢板的表面波纹度-变形前的钢板的表面波纹度
所述热浸镀锌钢板的拉伸强度可以为390-430MPa,伸长率可以为32%以上。
此外,本发明的另一个方面涉及一种制造表面鲜映性优异的高强度热浸镀锌钢板的方法,所述方法包括以下工艺:
将满足上述组成成分的钢坯加热至1100-1300℃;
将加热的所述钢坯进行热轧,以使精轧温度为920-970℃,然后在600-650℃的温度下进行收卷以制造热轧钢板;
将收卷的所述热轧钢板进行酸洗后以70-83%的压下率进行冷轧以获得冷轧钢板;
在760-830℃的温度范围内,将所述冷轧钢板进行退火,然后进行热浸镀锌;以及
在500-560℃的温度范围内,将热浸镀锌的钢板进行合金化热处理。
可以利用具有1.0-1.6μm的粗糙度(Ra)的平整轧辊,对合金化热处理的热浸镀锌钢板进行0.6-1.2%的平整轧制。
有益效果
具有如上所述的组成的本发明的热浸镀锌钢板具有优异的鲜映性和高强度,因此可以稳定地用作汽车外板用钢板。因此,可以将含有P的高强度冷轧钢板在汽车车身中的应用范围扩大到迄今为止尚未应用的部分,例如侧围外板(side outer)等,从而可以进一步促进汽车车身的轻量化。
最佳实施方式
以下,对本发明进行说明。
本发明人为了解决上述现有技术的问题而深入研究的结果,确认了在钢中添加作为强碳氮化物形成元素的钛(Ti)和/或铌(Nb)等,通过使碳(C)、氮(N)、硫(S)等固溶元素最小化来确保成型性,同时添加P和Mo等,从而可以制造一种拉伸强度为390MPa级以上的表面质量优异的车外板用高成型高强度钢板,从而完成了本发明。通常,作为汽车外板用钢板,必须具有高张力的同时满足深冲性等冲压成型性。因此,作为本发明的合金化热浸镀锌钢板的基材,使用将超低碳钢作为基础成分并添加作为强化元素的Mn、P等的高张力钢板,以提高加工性。
因此,根据这种观点制造的本发明的表面鲜映性优异的高强度热浸镀锌钢板中,以质量%计,包含:C:0.003-0.005%、Si:0.05%以下、Mn:0.4-1.0%、P:0.04-0.06%、S:0.01%以下、N:0.005%以下、S.Al:0.1%以下、Mo:0.05-0.08%、Ti:0.005-0.03%、Nb:0.02-0.035%、Cu:0.06-0.1%、B:0.0015%以下、余量的Fe和不可避免的杂质,并且C、Ti和Nb满足所述关系式1,以面积分数计,合金微细组织中的铁素体为95%以上,所述铁素体的晶粒平均尺寸为15μm以下,在1mm×1mm的面积中,5μm以下的超细晶粒具有7-10%的比例,并且由关系式2定义的△Wsa为0.1以下。
首先,对构成本发明的热浸镀锌钢板的基材的冷轧钢板的合金成分及其含量的限制理由进行说明。另外,除非另有规定,否则其中的“%”表示“重量%”。
碳(C):0.003-0.005%
C是间隙固溶元素,在冷轧和退火过程中对钢板的织构的形成有很大的影响,为此需要添加至少0.003%以上的C。但是,当钢中的固溶碳量增加时,具有有利于拉拔加工的{111}γ-纤维织构的晶粒的生长受到抑制,并促进具有{110}和{100}织构的晶粒的生长,因此退火板的拉拔性降低。进而,当所述C的含量超过0.005%时,使C析出为碳化物所需的Ti和Nb的含量增加,从而在经济性方面不利,而且形成珠光体等,因此成型性可能会降低。因此,在本发明中,所述C的含量优选限制在0.003-0.005%的范围。
硅(Si):0.05%以下(0%除外)
Si是有助于通过固溶强化来提高强度的元素。当所述Si的含量超过0.05%时,引发表面氧化皮缺陷,从而存在镀覆表面特性降低的问题,因此在本发明中优选将所述Si的含量控制在0.05%以下。
锰(Mn):0.4-1.0%
Mn是固溶强化元素,不仅有助于提高强度,而且起到将钢中的S析出为MnS的作用。当所述Mn的含量小于0.4%时,强度可能降低,另一方面,当所述Mn的含量超过1.0%时,可能会发生氧化物引起的表面问题,因此所述Mn的含量优选限制在0.4-1.0%。
磷(P):0.04-0.06%
P的固溶效果最优异,并且是在不显著损害拉拔性的情况下确保钢的强度的最有效的元素。当所述P的含量小于0.04%时,不能确保所期望的强度,另一方面,当所述P的含量超过0.06%时,可能会发生P偏析引起的二次脆性和表面条纹缺陷,因此所述P的含量优选限制在0.04-0.06%的范围。
钼(Mo):0.05-0.08%
Mo是与P(磷)的亲和力高的元素,起到抑制P偏析的作用。为了在超低碳钢中确保高强度,不可避免地需要使用P,通过添加适量的Mo,可以部分有助于改善P偏析引起的表面缺陷。当所述Mo的含量小于0.05%时,对期望的表面的改善效果不明显,当所述Mo的含量超过0.08%时,价格变贵,导致成本竞争力降低,因此所述Mo的含量优选限制在0.05-0.08%的范围。
硫(S):0.01%以下、氮(N):0.005%以下
S和N是存在于钢中的杂质,不可避免地被添加,为了确保优异的焊接特性,优选将S和N的含量控制地尽可能低。在本发明中,所述S的含量优选控制在0.01%以下,所述N的含量优选控制在0.005%以下。
铝(Al):0.1%以下(0%除外)
Al通过析出AlN来有助于提高钢的拉拔性和延展性。但是,当所述Al的含量超过0.1%时,由于在炼钢操作时形成过多的Al夹杂物,存在发生钢板内部缺陷的问题,因此所述Al的含量优选控制在0.1%以下。
钛(Ti):0.005-0.03%
Ti是在热轧过程中通过与固溶碳和固溶氮反应而析出Ti基碳氮化物,从而大大有助于提高钢板的拉拔性的元素。当所述Ti的含量小于0.005%时,无法使碳氮化物充分析出,因此拉拔性变差,另一方面,当所述Ti的含量超过0.03%时,炼钢操作时难以控制夹杂物,从而可能会发生夹杂物性缺陷,因此所述Ti的含量优选限制在0.005-0.03%的范围。
铌(Nb):0.02-0.035%
Nb是随着热轧时由于溶质拖曳(solute drag)和析出物钉扎(pinning)效应而使得奥氏体区未再结晶区扩大至高温,可以通过轧制和冷却的过程形成非常微细的晶粒(grain)的最有效的元素。当所述Nb的含量小于0.02%时,钢中的奥氏体未再结晶温度区域范围变窄,粒度微细化效果不明显。另一方面,当所述Nb的含量超过0.035%时,高温强度增加,存在难以热轧的问题,因此所述Nb的含量优选限制在0.02-0.035%的范围。
硼(B):0.003%以下(0%除外)
B是为了防止在钢中添加P而引起的二次加工脆性而添加的元素,但当所述B的含量超过0.003%时,伴随钢板的延展性的降低,因此所述B的含量优选限制在0.003%以下。
铜(Cu):0.04-0.1%
Cu是通过炼钢调整钢组成时难以去除的元素,含有微量(例如0.04%以上),但当Cu的含量超过0.1%时,在热浸镀锌钢板中容易产生痕迹,并且导致晶界脆化或成本增加,因此Cu的含量优选限制在0.04-0.1%的范围。
关系式1
在本发明中,需要控制C、Ti和Nb的含量,以使由以下关系式1定义的值满足0.03至0.04。本发明中设定这种关系式1的理由在于,很好地利用Ti、Nb的固溶状态的溶质拖曳和析出状态的钉扎效应的粒度微细化和均匀化对涂装后的鲜映性产生最大的影响。
当以下关系式1中定义的值小于0.03时,无法使粒度充分微细,从而变形后的表面变形量不恒定,无法获得优异的鲜映性,另一方面,当以下关系式1中定义的值超过0.04时,Nb等的添加量相对增加,在成本方面不利,并且强度高于预期,在确保伸长率方面存在问题。
[关系式1]
0.03≤[(Nb(48/93))+(Ti(93/48))+(C(12/48))]≤0.04
此外,包含余量的Fe和不可避免的杂质。并不排除添加除上述组成之外的有效的成分。
本发明是C的含量为0.005%以下的超低碳钢基材的热浸镀锌钢板,因此微细组织由铁素体单相组织组成。但是,所述铁素体单相组织还可以包含不可避免地形成的其它组织,因此以面积分数计,本发明的合金微细组织中的铁素体为95%以上,并且少量的珠光体等可以作为残余成分残留。
此外,本发明的作为热浸镀锌钢板的基材的冷轧钢板的微细组织晶粒的平均粒度优选为15μm以下。当所述平均粒度超过15μm以下时,由于成型时表面变形不均匀,存在难以确保期望的鲜映性的问题。更优选地,所述基材微细组织的平均晶体粒度控制在小于10μm。
此外,在本发明的基材冷轧钢板中,在1mm×1mm的面积中,5μm以下的超细晶粒优选具有7-10%的比例。通过具有这种比例,可以获得由以下关系式2定义的△Wsa为0.1以下的表面鲜映性优异的热浸镀锌钢板。当所述比例小于7%时,粒度相对大,成型后(5%变形后)的表面变形量增加,因此无法确保期望的鲜映性,当所述比例超过10%时,强度变得过高,在确保32%以上的伸长率的方面存在问题。
[关系式2]
△Wsa=5%变形后的钢板的表面波纹度-变形前的钢板的表面波纹度
接着,对本发明的制造表面鲜映性优异的高强度热浸镀锌钢板的方法进行说明。
本发明的制造高强度热浸镀锌钢板的方法包括以下工艺:将满足上述组成成分的钢坯加热至1100-1300℃;将加热的所述钢坯进行热轧,以使精轧温度为920-970℃,然后在600-650℃的温度下进行收卷以制造热轧钢板;将收卷的所述热轧钢板进行酸洗后以70-83%的压下率进行冷轧以获得冷轧钢板;在760-830℃的温度范围内,将所述冷轧钢板进行退火,然后进行热浸镀锌;以及在500-560℃的温度范围内,将热浸镀锌的钢板进行合金化热处理。
首先,在本发明中,在1100-1300℃的温度范围内,将具有如上所述的组成成分的钢坯进行加热。当所述加热温度低于1100℃时,由于FM区间的轧制负荷,在生产中可能会出现问题,当所述加热温度超过1300℃时,可能会引起发生表面氧化皮缺陷的问题。
接着,在本发明中,将加热的所述钢坯进行热轧,以使精轧温度为920-970℃,然后在600-650℃的温度下进行收卷以制造热轧钢板。
在本发明中,优选将所述精轧温度限制在920-970℃。当所述精轧温度低于920℃时,在表面部形成粗大晶粒,因此可能会发生材质不均匀的问题,当所述精轧温度超过970℃时,粒度不够微细,最终可能会发生材质不足的问题。
此外,在本发明中,优选将所述收卷温度控制在600-650℃的范围。当所述收卷温度低于600℃时,不形成Ti(Nb)C等析出物,固溶Ti、Nb增加,在退火工艺的加热时微细地析出为TiC、Ti(Nb)C,或者以Ti、Nb固溶状态存在,造成抑制再结晶和晶粒生长的影响,从而在确保期望实现的强度和伸长率方面可能存在问题,当所述收卷温度超过630℃时,由于形成二次氧化皮,可能会发生表面差的问题。
并且,在本发明中,在经过用于去除收卷的所述热轧钢板的表面氧化皮的酸洗工艺后,以70-83%的压下率进行冷轧以制造冷轧钢板。当所述冷轧压下率小于70%时,{111}织构无法充分生长,因此存在成型性变差的问题,另一方面,当所述冷轧压下率超过83%时,现场制造时轧辊负荷非常大,导致形状变差,因此存在问题。因此,所述压下率优选限制在70-83%,更优选限制在74-80%。
随后,使如上所述制造的冷轧钢板经过退火工艺并进行热浸镀锌或合金化热浸镀锌。
将冷轧钢板进行退火时,在760-830℃的温度范围内,在再结晶温度以上的温度下进行退火。通过在再结晶温度以上的温度下进行退火,可以去除由于轧制发生的变形,并使其软化,从而可以提高加工性。
退火的所述冷轧钢板可以在连续的热浸镀锌线中直接进行热浸镀锌。
并且,在本发明中,可以对制造的所述热浸镀锌钢板进行合金化热处理。合金化热处理是在进行热浸镀锌后在500-560℃的范围内进行。当所述合金化热处理温度低于500℃时,无法进行充分的合金化,另一方面,当所述合金化热处理温度超过560℃时,合金化过度地进行,镀层脆化,因此可能会引发由于冲压等加工而导致镀层剥离等问题。
此时,在本发明中,根据需要,可以利用具有1.0-1.6μm的粗糙度(Ra)的平整轧辊,对合金化热处理的热浸镀锌钢板进行0.6-1.2%的平整轧制。
具体实施方式
以下,通过实施例对本发明进行详细的说明。
(实施例)
将具有下表1中记载的合金组成的厚度为250mm的钢坯进行再加热至1250℃,然后在如下表2所示的条件下进行热轧、冷轧、连续退火和合金化热浸镀锌,从而制造热浸镀锌钢板。
并且,对于制造的各热浸镀锌钢板,测量拉伸特性、作为深冲加工的指标的r值(兰克福特值)、粒度和分布比,并研究△Wsa。以下,对其测量方法进行说明。
通过拉伸试验测量YS、TS、T-El。其中,YS、TS、T-El分别表示屈服强度、拉伸强度、断裂伸长率,拉伸试验中使用根据JIS5号标准取的试片。这些测量的结果,将拉伸强度为390-430MPa且伸长率为32%以上的情况视为合格。
另外,对于作为深冲加工的指标的r值的评价,从合金化热浸镀锌钢板在轧制方向的平行方向、45°方向、垂直方向的3个方向取JIS5号拉伸试片,并测量各试片的r值。例如,对于r值的测量,测量在上述拉伸试验中进行15%左右的拉伸变形时的板厚度的变化值和板宽度的变化值,并计算板宽度的变化值与板厚度的变化值的比例。并且,将轧制方向的平行方向的r值设为r0、45°方向的r值设为r45、垂直方向的r值设为r90时,通过以下数学式A计算各方向的r值。此外,在本实施例中,将r值为1.2以上的情况视为合格。
[数学式A]
A=r0+2*r45+r90/4
并且,对于粒度及其分布,通过EBSD测量并利用TSL OIM分析软件进行评价。
此外,为了评价变形后的Wsa,在具有直径为75mm的空心冲头(hollow punch)和压边圈的力的冲压机中,将225mm×225mm的坯料进行冲压,以完全抑制压边圈(blankholder)和模具(die)之间的基板的任何物质的移动,从而制造杯子(cup)。对于杯子的变形,冲头拉伸深度优选为约17-18mm,以使底部的厚度变形率为5%+/-0.2%左右。根据下表3,可知为了增加ΔWsa≤0.1的可能性,材料的晶粒尺寸应为15μm以下。
[表1]
*在表1中,所有钢种中的Al和N的含量分别为0.02%和0.0005%的范围,并且余量为Fe和不可避免的杂质。
[表2]
[表3]
如所述表1至表3所示,可以确认钢的组成成分和镀覆钢板的制造工艺条件满足本发明的范围的发明例1至发明例6显示出优异的拉伸特性、r值、超细晶粒比例和△Wsa。
另一方面,比较例1至比较例4是钢的组成成分满足本发明的范围但镀覆钢板的制造工艺不在本发明的范围内的情况。
具体地,在比较例1和比较例3中,在热轧工艺中的精轧出口温度(Finish MillDelivery Temperature,FDT)为Ar3温度以下的情况下操作,表层的粒度增大,导致最终退火组织中的超细晶粒的比例低,因此无法确保期望的△Wsa。
在比较例2中,由于在高达700℃的热轧收卷(CT)温度下操作,粒度粗大化,因此无法确保期望的超细晶粒的分数,并且在比较例4中,在退火温度为再结晶温度以下的情况下操作,因此无法实现充分的再结晶,并且无法确保期望的强度和伸长率。
此外,可知钢的组成成分和镀覆钢板的制造工艺条件均不在本发明的范围内的比较例5至比较例7不满足超细晶粒的比例,并且△Wsa值增大,因此鲜映性差。
另外,比较例8是钢的组成成分中的关系式1不在本发明的范围内的情况,即使是通过本发明的镀覆钢板的制造工艺制造镀覆钢板的情况,最终超细晶粒的分数也不足,因此无法确保期望的△Wsa值。
如上所述,本发明的详细的说明中对本发明的优选的实施例进行了说明,但本领域技术人员可以在不脱离本发明的范畴的情况下进行各种变形。因此,本发明的权利范围并不局限于所说明的实施例,应由权利要求书及其等同物确定。
Claims (4)
1.一种表面鲜映性优异的高强度热浸镀锌钢板,以质量%计,所述钢板包含:C:0.003-0.005%、Si:0.05%以下、Mn:0.4-1.0%、P:0.04-0.06%、S:0.01%以下、N:0.005%以下、S.Al:0.1%以下、Mo:0.05-0.08%、Ti:0.005-0.03%、Nb:0.02-0.035%、Cu:0.06-0.1%、B:0.0015%、余量的Fe和不可避免的杂质,并且C、Ti和Nb满足以下关系式1,
以面积分数计,合金微细组织中的铁素体为95%以上,所述铁素体的晶粒平均尺寸为15μm以下,在1mm×1mm的面积中,5μm以下的超细晶粒具有7-10%的比例,并且由以下关系式2定义的△Wsa为0.1以下,[关系式1]
0.03≤[(Nb(48/93))+(Ti(93/48))+(C(12/48))]≤0.04
[关系式2]
△Wsa=5%变形后的钢板的表面波纹度-变形前的钢板的表面波纹度。
2.根据权利要求1所述的表面鲜映性优异的高强度热浸镀锌钢板,其特征在于,所述钢板的拉伸强度为390-430MPa,伸长率为32%以上。
3.一种制造表面鲜映性优异的高强度热浸镀锌钢板的方法,其包括以下工艺:
将钢坯加热至1100-1300℃,以质量%计,所述钢坯包含:C:0.003-0.005%、Si:0.05%以下、Mn:0.4-1.0%、P:0.04-0.06%、S:0.01%以下、N:0.005%以下、S.Al:0.1%以下、Mo:0.05-0.08%、Ti:0.005-0.03%、Nb:0.02-0.035%、Cu:0.06-0.1%、B:0.0015%以下、余量的Fe和不可避免的杂质,并且C、Ti和Nb满足以下关系式1;
将加热的所述钢坯进行热轧,以使精轧温度为920-970℃,然后在600-650℃的温度下进行收卷以制造热轧钢板;
将收卷的所述热轧钢板进行酸洗后以70-83%的压下率进行冷轧以获得冷轧钢板;
在760-830℃的温度范围内,将所述冷轧钢板进行退火,然后进行热浸镀锌;以及
在500-560℃的温度范围内,将热浸镀锌的钢板进行合金化热处理,[关系式1]
0.03≤[(Nb(48/93))+(Ti(93/48))+(C(12/48))]≤0.04。
4.根据权利要求3所述的制造表面鲜映性优异的高强度热浸镀锌钢板的方法,其特征在于,利用具有1.0-1.6μm的粗糙度Ra的平整轧辊,对合金化热处理的热浸镀锌钢板进行0.6-1.2%的平整轧制处理。
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