CN116904873A - 经热轧的钢板及其制造方法 - Google Patents
经热轧的钢板及其制造方法 Download PDFInfo
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- CN116904873A CN116904873A CN202311104095.7A CN202311104095A CN116904873A CN 116904873 A CN116904873 A CN 116904873A CN 202311104095 A CN202311104095 A CN 202311104095A CN 116904873 A CN116904873 A CN 116904873A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 110
- 239000010959 steel Substances 0.000 title claims abstract description 110
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 23
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 15
- 239000011572 manganese Substances 0.000 claims abstract description 15
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 15
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 13
- 239000010955 niobium Substances 0.000 claims abstract description 13
- 230000001186 cumulative effect Effects 0.000 claims abstract description 12
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 12
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 12
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 11
- 239000011733 molybdenum Substances 0.000 claims abstract description 11
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000010703 silicon Substances 0.000 claims abstract description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011651 chromium Substances 0.000 claims abstract description 9
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 9
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000000717 retained effect Effects 0.000 claims abstract description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 239000011593 sulfur Substances 0.000 claims abstract description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 239000011574 phosphorus Substances 0.000 claims abstract description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052796 boron Inorganic materials 0.000 claims abstract description 5
- 239000011575 calcium Substances 0.000 claims abstract description 5
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 239000011777 magnesium Substances 0.000 claims abstract description 5
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000010936 titanium Substances 0.000 claims abstract description 4
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 22
- 238000012545 processing Methods 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 8
- 238000001816 cooling Methods 0.000 description 30
- 238000000034 method Methods 0.000 description 17
- 238000005098 hot rolling Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000009749 continuous casting Methods 0.000 description 4
- 150000004767 nitrides Chemical class 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000003303 reheating Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000011265 semifinished product Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 description 1
- 241000282376 Panthera tigris Species 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- UNASZPQZIFZUSI-UHFFFAOYSA-N methylidyneniobium Chemical compound [Nb]#C UNASZPQZIFZUSI-UHFFFAOYSA-N 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910001568 polygonal ferrite Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- -1 vanadium form nitrides Chemical class 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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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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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
- 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
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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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- C21D8/02—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
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- C21D2211/00—Microstructure comprising significant phases
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Abstract
一种经热轧的钢板,以重量百分比表示,其组成包含以下元素:0.11%≤碳≤0.16%,1%≤锰≤2%,0.1%≤硅≤0.7%,0.02%≤铝≤0.1%,0.15%≤钼≤0.4%,0.15%≤钒≤0.4%,0.002%≤磷≤0.02%,0%≤硫≤0.005%,0%≤氮≤0.01%,并且可以包含以下任选元素中的一者或更多者:0%≤铬≤0.5%,0%≤铌≤0.05%,0.0001%≤钙≤0.005%,0%≤硼≤0.001%,0%≤镁≤0.0010%,0%≤钛≤0.01%,其中0.3%≤Mo+V+Nb≤0.6%,剩余部分组成由铁和不可避免的杂质构成,钢板的显微组织以面积分数计包含:70%至90%的贝氏体、10%至25%的铁素体,其中贝氏体和铁素体的累积量为至少90%,以及残余奥氏体和马氏体的累积量为0%至10%。
Description
本发明专利申请是申请日为2019年9月2日、申请号为201980062055.6、发明名称为“经热轧的钢板及其制造方法”的发明专利申请的分案申请。
本发明涉及适合用作汽车用钢板的经热轧的钢板。
汽车部件需要满足两个不一致的需求,即,易于成形且具有强度,但是近年来,考虑到全球环境问题,还给予汽车以改善燃料消耗的第三个要求。因此,现在汽车部件必须由具有高可成形性的材料制成,以符合复杂汽车组件的易于装配的标准,并且同时必须针对车辆耐撞性和耐久性而改善强度同时减小车辆的重量以改善燃料效率。
因此,进行了大量的研究和开发努力以通过增加材料的强度来减少汽车中使用的材料的量。相反地,钢板强度的增加使可成形性降低,并因此必须开发具有高强度和高可成形性二者的材料。
高强度和高可成形性钢板领域中的早期研究和开发已经产生了数种用于生产高强度和高可成形性钢板的方法,本文中列举其中的一些方法以用于对本发明的明确理解:
EP 1138796要求保护一种特别适用于汽车部件生产的具有非常高的弹性限度和机械抗性的经热轧的钢,其特征在于按重量计的以下组成:0.08%<碳<0.16%,1%<锰<2%,0.02%<铝<0.1%,硅<0.5%,磷<0.03%,硫<0.01%,钒<0.3%,铬<1%,氮<0.015%,钼<0.6%。但是EP1138796的钢没有表现出具有对于制造汽车部件至关重要的扩孔率。
EP2171112是涉及经热轧的钢板的发明,所述经热轧的钢板具有高于800MPa的抗性和高于10%的断裂延伸率,并且按重量计,具有以下组成:0.050%≤C≤0.090%,1%<Mn≤2%,0.015%≤Al≤0.050%,0.1%≤Si≤0.3%,0.10%≤Mo≤0.40%,S≤0.010%,P≤0.025%,0.003%≤N≤0.009%,0.12%≤V≤0.22%,Ti≤0.005%,Nb≤0.020%和任选地Cr≤0.45%,余量由铁和因生产产生的不可避免的杂质组成,其中板或部件的显微组织以表面分数计包含至少80%的上贝氏体,任选的余量由下贝氏体、马氏体和残余奥氏体组成,马氏体和残余奥氏体含量之和低于5%。但是该发明也不能表现出汽车部件所需的扩孔率。
本发明的目的是通过使得可获得同时具有以下特性的经热轧的钢板来解决这些问题:
-大于或等于940MPa并且优选大于960MPa的抗拉强度,
-大于或等于8%并且优选大于9%的总延伸率,
-大于或等于40%并且优选大于45%的扩孔率。
在一个优选的实施方案中,根据本发明的钢板还可以呈现出750MPa或更大的屈服强度。
在一个优选的实施方案中,根据本发明的钢板还可以呈现出0.5或更大的屈服强度与抗拉强度比。
优选地,这样的钢还可以具有良好的成形适用性(特别是对于轧制)以及良好的可焊性和可涂覆性。
本发明的另一个目的还在于使得可获得与常规工业应用相容同时对制造参数变化稳健的用于制造这些板的方法。
本发明的经热轧的钢板可以任选地涂覆有锌或锌合金以改善其耐腐蚀性。
碳以0.11%至0.16%存在于钢中。碳是通过控制铁素体形成来增加钢板的强度所必需的元素,碳还通过形成碳化钒或碳化铌通过析出强化而赋予钢以强度,因此,碳在增加强度方面起关键作用。但是,小于0.11%的碳含量将不能赋予本发明的钢以抗拉强度。另一方面,在超过0.16%的碳含量下,钢表现出差的可点焊性,这限制其应用于汽车部件。用于本发明的优选含量可以保持在0.11%至0.15%。
本发明的钢的锰含量为1%至2%。该元素是γ相生成元素(gammagenous)并且还影响Bs和Ms温度,因此在控制铁素体形成方面起重要作用。添加锰的目的本质上是赋予钢以淬透性。发现至少1重量%的量的锰用以向钢板提供强度和淬透性。但是,当锰含量大于2%时,其产生不利的影响,例如在热轧之后在冷却期间,其阻碍奥氏体的转变。此外,大于1.8%的锰含量,其促进中心偏析,因此使本发明的钢的可成形性降低并且还使可焊性劣化。用于本发明的优选含量可以保持在1.3%至1.8%。
本发明的钢的硅含量为0.1%至0.7%。硅是固溶体增强剂(solid solutionstrengthener),特别是对于显微组织铁素体和贝氏体。此外,较高的硅含量可以阻碍渗碳体的析出。然而,不相称的硅含量导致诸如表面缺陷(例如虎皮条(tiger strip))的问题,这不利地影响本发明的钢的可涂覆性。因此,将浓度控制在0.7%的上限内。用于本发明的优选含量可以保持在0.2%至0.6%。
铝是以0.02%至0.1%存在于本发明的钢中的元素。铝是α相生成元素(alphagenous element),并赋予本发明的钢以延展性。钢中的铝具有与氮结合以形成氮化铝的倾向,因此从本发明的观点来看,必须将铝含量保持尽可能低,优选为0.02%至0.06%。
钼是构成本发明的钢的0.15%至0.4%的必需元素,钼增加了本发明的钢的淬透性,并在热轧之后在冷却期间影响奥氏体向铁素体和贝氏体的转变。然而,钼的添加过度使合金元素的添加成本增加,使得出于经济原因将其含量限制于0.4%。钼的优选限度为0.15%至0.3%。
钒是构成本发明的钢的0.15%至0.4%的必需元素。钒通过形成碳化物、氮化物或碳-氮化物而在增强钢的强度方面是有效的,并且由于经济原因,上限为0.4%。这些碳化物、氮化物或碳-氮化物在第二步冷却和第三步冷却期间形成。钒的优选限度为0.15%至0.3%。
本发明的钢的磷成分为0.002%至0.02%。磷特别是由于其在晶界处偏析或者与锰共偏析的倾向而使可点焊性和热延展性降低。由于这些原因,将其含量限制于0.02%并且优选低于0.015%。
硫不是必需元素,但是可以作为杂质包含在钢中,并且从本发明的观点出发,硫含量优选尽可能低,但是从制造成本的观点出发,硫含量为0.005%或更小。此外,如果钢中存在较高的硫,则其尤其与锰结合以形成硫化物并且降低其对本发明的钢的有益影响,因此优选低于0.003%。
将氮限制于0.01%以避免材料的老化,氮与钒和铌形成通过析出强化而赋予本发明的钢以强度的氮化物,但是只要氮的存在大于0.01%,其就可以形成对本发明有害的大量的氮化铝,因此氮的优选上限为0.005%。
铬对于本发明是任选元素。可以存在于本发明的钢中的铬含量为0%至0.5%。铬是向钢提供淬透性的元素,但高于0.5%的较高的铬含量导致类似于锰的中心共偏析。
铌对于本发明是任选元素。铌含量可以以0%至0.05%存在于本发明的钢中并添加在本发明的钢中以形成碳化物或碳-氮化物以通过析出强化来赋予本发明的钢以强度。
本发明的钢中的钙含量为0.0001%至0.005%。钙作为任选元素尤其是在夹杂物处理期间添加到本发明的钢中,从而阻碍了硫的有害效果。
0.3≤Mo+V+Nb≤0.6
钼、钒和铌的累积存在保持在0.3%至0.6%以赋予本发明的钢以强度和扩孔率,因为铌和钒二者均形成氮化物、碳氮化物或碳化物,而钼确保形成足够的铁素体,因此,该式通过确保析出物的形成来支持本发明以在抗拉强度之间达到平衡,并通过确保足够的铁素体来赋予扩孔率。
其他元素例如硼或镁可以按以下重量比例单独添加或者组合添加:硼≤0.001%,镁≤0.0010%。直至所示的最大含量水平,这些元素使得可以使晶粒在凝固期间细化。
钛是剩余元素,并且可以以多至0.01%存在。
钢的组成的剩余部分由铁和因加工产生的不可避免的杂质组成。
钢板的显微组织包含:
对于本发明的钢,按面积分数计,贝氏体构成显微组织的70%至90%。贝氏体作为基体构成钢的初相,并且累积地由上贝氏体和下贝氏体组成。为了确保940MPa并且优选960MPa或更大的抗拉强度,需要具有70%的贝氏体。贝氏体在第三步冷却期间开始形成,并且形成直至卷取。
对于本发明的钢,按面积分数计,铁素体构成显微组织的10%至25%。铁素体累积地包括多边形铁素体和针状铁素体。铁素体赋予本发明的钢以延伸率以及可成形性。为了确保8%并且优选9%或更大的延伸率,需要具有10%的铁素体。铁素体在热轧之后在冷却期间形成在本发明的钢中。但是只要铁素体含量以大于25%存在于本发明的钢中,就无法实现抗拉强度。
贝氏体和铁素体的累积量大于90%,以确保强度与可成形性之间的平衡。由于贝氏体和铁素体的存在确保可成形性,贝氏体和铁素体的累积存在赋予940MPa的抗拉强度。
对于本发明的钢,马氏体和残余奥氏体是任选成分,并且按面积分数计,可以累积地以0%至10%存在并且以痕量发现。用于本发明的马氏体包括新鲜马氏体和回火马氏体二者。马氏体赋予本发明的钢以强度。当马氏体超过10%时,其赋予过度的强度但是使屈服强度超出可接受的上限。在一个优选的实施方案中,马氏体和残余奥氏体的累积量为2%至10%。
除上述显微组织之外,经热轧的钢板的显微组织不含诸如珠光体和渗碳体的显微组织组分,但是可以以痕量发现。
根据本发明的钢板可以通过任何合适的方法来生产。优选的方法包括提供具有根据本发明的化学组成的钢的半成品铸件。可以将铸件制成锭或者连续地制成薄板坯或薄带材的形式,即,厚度范围从对于板坯的约220mm至对于薄带材的数十毫米。
例如,具有上述化学组成的板坯通过连铸来制造,其中板坯在连铸过程期间任选地经历直接轻压下以避免中心偏析并确保局部碳与标称碳之比保持低于1.10。通过连铸过程提供的板坯可以在连铸之后在高温下直接使用,或者可以首先冷却至室温然后再加热以进行热轧。
经历热轧的板坯的温度优选为至少1200℃并且必须低于1300℃。在板坯的温度低于1200℃的情况下,在轧机上施加过大的负荷。因此,优选地,板坯的温度足够高使得热轧可以在100%奥氏体范围内完成,必须避免在高于1275℃的温度下再加热,因为这导致生产率下降并且在工业上也是昂贵的。因此,优选的再加热温度为1200℃至1275℃。
本发明的热轧终止温度为850℃至975℃,优选为880℃至930℃。
然后在三步冷却过程中将以这种方式获得的经热轧的带冷却,其中第一步冷却在热轧终止之后立即开始,在第一步中,将经热轧的带以40℃/秒至150℃/秒的冷却速率从热轧终止冷却至650℃至720℃的温度范围。在一个优选的实施方案中,第一步冷却的冷却速率为40℃/秒至120℃/秒。
此后,第二步冷却从650℃至725℃的温度范围开始,持续1秒至10秒,优选2秒至9秒的时间段,并且第二步在620℃至690℃下停止。在该步骤期间,冷却通过空气冷却来进行,并且根据待制造的钢的可预见的铁素体显微组织来确定时限,进一步地,在该步骤期间,形成铁素体显微组织,微合金元素例如钒和/或铌形成氮化物、碳化物和碳-氮化物以赋予钢以强度。
然后,第三步冷却以大于20℃/秒的冷却速率从620℃至690℃的温度范围开始到450℃至550℃的卷取温度范围。在该冷却步骤中,贝氏体转变开始,并且该贝氏体转变持续进行,直至经卷取的经热轧的带在冷却的同时超过Ms温度,此后贝氏体转变停止。在一个优选的实施方案中,卷取温度范围为470℃至530℃。
此后,将经热轧的带在450℃至550℃,优选470℃至530℃的温度范围卷取。然后,将经卷取的经热轧的带冷却至室温以获得经热轧的钢板。
实施例
本文中呈现的以下测试、实施例、图形示例和表本质上是非限制性的,并且必须仅出于说明的目的而被考虑,并且将显示本发明的有利特征。
表1中汇总了由具有不同组成的钢制成的钢板,其中分别根据如表2记明的工艺参数生产钢板。此后,表3汇总了在试验期间获得的钢板的显微组织,表4汇总了获得的特性的评估结果。
表3
表3例示了在用于确定本发明的钢和参照钢二者的显微组织的不同显微镜例如扫描电子显微镜上根据标准进行的测试的结果。
本文中记明了结果:
试验 | 铁素体(%) | 贝氏体(%) | RA+马氏体(%) | 贝氏体+铁素体 |
I1 | 17 | 80 | 3 | 97 |
I2 | 12 | 80 | 8 | 92 |
I3 | 20 | 71 | 9 | 91 |
I4 | 12 | 82 | 6 | 94 |
I5 | 18 | 75 | 7 | 93 |
I6 | 12 | 80 | 8 | 92 |
R1 | 29 | 67 | 4 | 96 |
R2 | 35 | 58 | 7 | 93 |
R3 | 50 | 40 | 10 | 90 |
R4 | 40 | 38 | 22 | 78 |
R5 | 15 | 67 | 18 | 82 |
I=根据本发明;R=参照;带下划线的值:未根据本发明
表4
表4例示了本发明的钢和参照钢二者的机械特性。为了确定抗拉强度、屈服强度和总延伸率,根据JIS Z2241标准进行抗拉测试。
汇总了根据标准进行的各机械测试的结果。
表4
试验 | 抗位强度(MPa) | 屈服强度(MPa) | 总延伸率(%) | 扩孔率(%) |
I1 | 977 | 846 | 13 | 45 |
I2 | 1002 | 884 | 10 | 58 |
I3 | 1011 | 882 | 9.5 | 42 |
I4 | 983 | 857 | 12 | 51 |
I5 | 994 | 868 | 11.5 | 42 |
I6 | 998 | 866 | 11 | 54 |
R1 | 920 | 832 | 10 | 48 |
R2 | 912 | 823 | 14 | 35 |
R3 | 889 | 809 | 14 | 68 |
R4 | 860 | 675 | 13 | 46 |
R5 | 1026 | 824 | 10 | 26 |
I=根据本发明;R=参照;带下划线的值:未根据本发明
根据本公开的实施例,还公开了以下附记:
附记1.一种经热轧的钢板,以重量百分比表示,其组成包含以下元素:
0.11%≤碳≤0.16%
1%≤锰≤2%
0.1%≤硅≤0.7%
0.02%≤铝≤0.1%
0.15%≤钼≤0.4%
0.15%≤钒≤0.4%
0.002%≤磷≤0.02%
0%≤硫≤0.005%
0%≤氮≤0.01%
并且可选地包含以下元素中的一种或更多种:
0%≤铬≤0.5%
0%≤铌≤0.05%
0.0001%≤钙≤0.005%
0%≤硼≤0.001%
0%≤镁≤0.0010%
0%≤钛≤0.01%
其中0.3%≤Mo+V+Nb≤0.6%
剩余部分组成由铁和因加工产生的不可避免的杂质构成,所述钢板的显微组织以面积分数计包含:70%至90%的贝氏体、10%至25%的铁素体,其中贝氏体和铁素体的累积量为至少90%,以及残余奥氏体和马氏体的累积量为0%至10%。
附记2.根据附记1所述的经热轧的钢板,其中所述组成包含0.2%至0.6%的硅。
附记3.根据附记1或2所述的经热轧的钢板,其中所述组成包含0.11%至0.15%的碳。
附记4.根据附记3所述的经热轧的钢板,其中所述组成包含0.15%至0.3%的钒。
附记5.根据附记1至4中任一项所述的经热轧的钢板,其中所述组成包含1.3%至1.8%的锰。
附记6.根据附记1至5中任一项所述的经热轧的钢板,其中所述组成包含0.15%至0.3%的钼。
附记7.根据附记1至6中任一项所述的经热轧的钢板,其中所述组成包含0.02%至0.06%的铝。
附记8.根据附记1至7中任一项所述的经热轧的钢板,其中残余奥氏体和马氏体的累积量为2%至10%。
附记9.根据附记1至8中任一项所述的经热轧的钢板,其中所述钢板具有950MPa或更大的抗拉强度和40%或更大的扩孔率。
附记10.根据附记9所述的经热轧的钢板,其中所述钢板具有960MPa或更大的抗拉强度和8%或更大的总延伸率。
附记11.一种生产经热轧的经热处理的钢板的方法,其包括以下顺序步骤:
-提供根据附记1至7中任一项所述的钢组成;
-将半成品再加热至1200℃至1300℃的温度;
-在奥氏体范围内对所述半成品进行轧制以获得经热轧的钢带,其中热轧终止温度应为850℃至975℃;
-然后,在三步冷却中将所述经热轧的带冷却,其中:
○第一步冷却,将所述经热轧的钢板以40℃/秒至150℃/秒的冷却速率从850℃至975℃的温度范围开始冷却至650℃至725℃的温度范围;
○第二步冷却,将所述经热轧的钢板从650℃至725℃的温度范围开始冷却至620℃至690℃的温度范围,所述第二步具有1秒至10秒的持续时间并且为空气冷却,第三步冷却,将所述经热轧的钢板以大于20℃/秒的冷却速率从620℃至690℃的温度范围开始冷却至450℃至550℃的温度范围;
-此后在450℃至550℃的温度范围下卷取所述经热轧的钢带;
-将经卷取的经热轧的钢带冷却至室温。
附记12.根据附记11所述的方法,其中半成品的再加热温度为1200℃至1275℃。
附记13.根据附记11或12所述的方法,其中所述热轧终止温度为880℃至930℃。
附记14.根据附记11至13中任一项所述的方法,其中卷取温度范围为470℃至530℃。
附记15.根据附记11至14中任一项所述的方法,其中所述第一步冷却的冷却速率为40℃/秒至120℃/秒。
附记16.根据附记11至15中任一项所述的方法,其中所述第三步冷却的冷却速率大于等于25℃/秒。
附记17.根据附记11至16中任一项所述的方法,其中所述第二步冷却的持续时间为2秒至9秒。
附记18.根据附记1至10中任一项所述的钢板或者根据附记11至17所述的方法生产的钢板用于制造车辆的结构部件或安全部件的用途。
附记19.一种车辆,其包括根据附记18获得的部件。
Claims (12)
1.一种经热轧的钢板,以重量百分比表示,其组成包含以下元素:
0.11%≤碳≤0.16%
1%≤锰≤2%
0.1%≤硅≤0.7%
0.02%≤铝≤0.1%
0.15%≤钼≤0.4%
0.15%≤钒≤0.4%
0.002%≤磷≤0.02%
0%≤硫≤0.005%
0%≤氮≤0.01%
并且可选地包含以下元素中的一种或更多种:
0%≤铬≤0.5%
0%≤铌≤0.05%
0.0001%≤钙≤0.005%
0%≤硼≤0.001%
0%≤镁≤0.0010%
0%≤钛≤0.01%
其中0.3%≤Mo+V+Nb≤0.6%
剩余部分组成由铁和因加工产生的不可避免的杂质构成,所述钢板的显微组织以面积分数计包含:70%至90%的贝氏体、10%至25%的铁素体,其中贝氏体和铁素体的累积量为至少90%,以及残余奥氏体和马氏体的累积量为0%至10%。
2.根据权利要求1所述的经热轧的钢板,其中所述组成包含0.2%至0.6%的硅。
3.根据权利要求1或2所述的经热轧的钢板,其中所述组成包含0.11%至0.15%的碳。
4.根据权利要求3所述的经热轧的钢板,其中所述组成包含0.15%至0.3%的钒。
5.根据权利要求1至4中任一项所述的经热轧的钢板,其中所述组成包含1.3%至1.8%的锰。
6.根据权利要求1至5中任一项所述的经热轧的钢板,其中所述组成包含0.15%至0.3%的钼。
7.根据权利要求1至6中任一项所述的经热轧的钢板,其中所述组成包含0.02%至0.06%的铝。
8.根据权利要求1至7中任一项所述的经热轧的钢板,其中残余奥氏体和马氏体的累积量为2%至10%。
9.根据权利要求1至8中任一项所述的经热轧的钢板,其中所述钢板具有950MPa或更大的抗拉强度和40%或更大的扩孔率。
10.根据权利要求9所述的经热轧的钢板,其中所述钢板具有960MPa或更大的抗拉强度和8%或更大的总延伸率。
11.根据权利要求1至10中任一项所述的钢板用于制造车辆的结构部件或安全部件的用途。
12.一种车辆,其包括根据权利要求11获得的部件。
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PCT/IB2018/057549 WO2020065381A1 (en) | 2018-09-28 | 2018-09-28 | Hot rolled steel sheet and a method of manufacturing thereof |
PCT/IB2019/057381 WO2020065422A1 (en) | 2018-09-28 | 2019-09-02 | Hot rolled and steel sheet and a method of manufacturing thereof |
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JP2000282175A (ja) * | 1999-04-02 | 2000-10-10 | Kawasaki Steel Corp | 加工性に優れた超高強度熱延鋼板およびその製造方法 |
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