CN115066507B - 高强度冷轧且镀锌扩散退火钢板及其制造方法 - Google Patents
高强度冷轧且镀锌扩散退火钢板及其制造方法 Download PDFInfo
- Publication number
- CN115066507B CN115066507B CN202180013081.7A CN202180013081A CN115066507B CN 115066507 B CN115066507 B CN 115066507B CN 202180013081 A CN202180013081 A CN 202180013081A CN 115066507 B CN115066507 B CN 115066507B
- Authority
- CN
- China
- Prior art keywords
- steel sheet
- temperature
- cold rolled
- galvanised
- seconds
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 84
- 239000010959 steel Substances 0.000 title claims abstract description 84
- 238000009792 diffusion process Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 21
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 20
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000002791 soaking Methods 0.000 claims description 27
- 238000000137 annealing Methods 0.000 claims description 22
- 229910001566 austenite Inorganic materials 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 239000011701 zinc Substances 0.000 claims description 9
- 239000010960 cold rolled steel Substances 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- 238000005097 cold rolling Methods 0.000 claims description 5
- 238000005098 hot rolling Methods 0.000 claims description 5
- 239000011265 semifinished product Substances 0.000 claims description 5
- 238000003303 reheating Methods 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 2
- 238000005554 pickling Methods 0.000 claims 2
- 238000005266 casting Methods 0.000 claims 1
- 238000007654 immersion Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 238000003618 dip coating Methods 0.000 description 6
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- 239000011733 molybdenum Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005244 galvannealing Methods 0.000 description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 229910052796 boron Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 238000007792 addition Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 238000010191 image analysis Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 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
- 238000005275 alloying Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- -1 molybdenum Chemical compound 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- 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
-
- 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
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
本发明涉及冷轧且镀锌扩散退火钢板,所述钢板具有按重量百分比计包含以下的组成:C 0.15%至0.25%、Mn 2.4%至3.5%、Si 0.30%至0.90%、Cr 0.30%至0.70%、Mo 0.05%至0.35%、Al 0.001%至0.09%、Ti 0.01至0.06、B 0.0010%至0.0040%、Nb 0.01%至0.05%、P≤0.020%、S≤0.010%和N≤0.008%,所述组成的剩余部分为铁和由熔炼引起的不可避免的杂质,以及所述钢板具有以表面分数计由80%至90%的马氏体、余量为铁素体和贝氏体组成的显微组织。
Description
本发明涉及高强度冷轧且镀锌扩散退火钢板并且涉及获得这样的钢板的方法。
降低车辆的重量以减少CO2排放是汽车工业中的主要挑战。这种重量节约必须与安全要求相结合。为了满足这些要求,对抗拉强度高于1450MPa的极高强度钢的需求增加导致了炼钢工业持续开发新的牌号。
这些钢通常涂覆有金属涂层,从而改善这样的耐腐蚀性的特性。所述金属涂层可以通过在钢板退火之后进行热浸镀锌来沉积。为了获得改善的点焊性,热浸涂覆可以后接合金化处理以获得镀锌扩散退火钢板,使得钢板的铁朝着锌涂层扩散以在钢板上获得锌-铁合金。
公开WO2019188190涉及抗拉强度高于1470MPa的高强度镀锌或镀锌扩散退火钢板。为了获得这样的抗拉强度水平,钢板的碳含量为0.200重量%至0.280重量%,这可能降低钢板的可焊性。此外,避免了铁素体和贝氏体(其二者之和与珠光体的总量小于2%)的形成以确保良好的抗拉强度水平。为此,必须在高于Ac3的温度下进行冷轧之后的均热步骤。
公开WO2016199922涉及抗拉强度高于1470MPa的高强度镀锌扩散退火钢板。0.25%至0.70%的高量的碳允许获得这种高的抗拉强度水平。但是钢板的可焊性可能降低。在合金化步骤之后,必须以受控的方式将钢板冷却以在冷却结束时获得多于10%的残余奥氏体。在该冷却步骤之后,使镀锌扩散退火钢板经受回火的步骤以获得回火马氏体,从而促进贝氏体转变并且导致碳富集到残余奥氏体中,以获得期望的最终显微组织:10%至60%的残余奥氏体、少于5%的高温回火马氏体、少于5%的低温回火马氏体、少于10%的新鲜马氏体、少于15%的铁素体、少于10%的珠光体,余量为贝氏体。这些受控的冷却和回火步骤使制造过程复杂。
因此,本发明的目的是解决上述问题并且提供抗拉强度大于或等于1450MPa并且在常规工艺路线上可容易地加工的镀锌扩散退火钢板。
在本发明的一个优选实施方案中,屈服强度YS大于或等于1050MPa。
现在将在不引入限制的情况下通过实施例来详细地描述并且举例说明本发明。
下文中,Ac3表示高于其,显微组织完全为奥氏体的温度;Ac1表示高于其,奥氏体开始形成的温度。
现在将描述根据本发明的钢的组成,含量以重量百分比表示。
碳含量为0.15%至0.25%以确保令人满意的强度。如果碳含量过高,则钢板的可焊性不足。低于0.15%的碳含量水平使得不能实现足够的抗拉强度。
锰含量为2.4%至3.5%以确保令人满意的强度并且限制贝氏体转变。高于3.5%的添加,中心偏析的风险增加,从而损害延性。为了提供钢板的强度和淬透性以及为了使奥氏体稳定,至少2.4%的锰的量是强制性的。优选地,锰含量为2.5%至3.2%。
根据本发明,硅含量为0.30%至0.90%。硅为参与固溶体中的硬化的元素。至少0.30%的硅添加使得可以获得足够的铁素体和贝氏体的硬化。高于0.90%,在表面处形成硅氧化物,这损坏钢的可涂覆性。此外,硅可能损坏可焊性。在一个优选的实施方案中,硅含量为0.30%至0.70%。在另一个优选的实施方案中,硅含量为0.30%至0.50%。
根据本发明,铬含量为0.30%至0.70%。铬为参与固溶体中的硬化的元素。低于0.30%的铬含量水平使得不能实现足够的抗拉强度。铬含量必须小于或等于0.70%以获得令人满意的断裂伸长率并且限制成本。
根据本发明,钼含量为0.05%至0.35%。至少0.05%的钼添加改善钢的淬透性并且限制在热浸涂覆之前和期间的贝氏体转变。高于0.35%,钼的添加成本高并且考虑到所需的特性为无效的。优选地,钼含量为0.05%至0.20%。
根据本发明,铝含量为0.001%至0.09%,因为其为使精炼期间以液相形式的钢脱氧的非常有效的元素。铝含量低于0.09%以避免在临界均热之后的冷却期间的氧化问题和铁素体形成。优选地,铝量为0.001%至0.06%。
钛以0.01%至0.06%的量添加以提供析出强化并且保护硼免于形成BN。根据本发明,硼含量为0.0010%至0.0040%。与钼一样,硼改善钢的淬透性。硼含量低于0.0040%以避免在连铸期间使板坯断裂的风险。铌添加0.01%至0.05%以使热轧期间的奥氏体晶粒细化并且提供析出强化。
所述钢的组成的剩余部分为铁和由熔炼引起的杂质。在该方面,P、S和N至少被认为是残余元素,其为不可避免的杂质。它们的含量对于S小于0.010%,对于P小于0.020%,以及对于N小于0.008%。
现在将描述根据本发明的冷轧且镀锌扩散退火钢板的显微组织。
在冷轧之后,将经冷轧的钢板加热至均热温度T均热并且在所述温度下保持保持时间t均热,选择二者以在该临界均热结束时获得具有由85%至95%的奥氏体和5%至15%的铁素体组成的显微组织的钢板。
在热浸涂覆期间,在临界均热之后的冷却之后,奥氏体的一部分转变成贝氏体。
在镀锌扩散退火步骤之后的室温下的冷却步骤期间,奥氏体转变成马氏体。冷轧且镀锌扩散退火钢板具有以表面分数计由80%至90%的马氏体、余量为铁素体和贝氏体组成的最终显微组织。
这些80%至90%的马氏体确保良好的抗拉强度水平。该马氏体包含自动回火马氏体和新鲜马氏体。铁素体和贝氏体的总和为10%至20%以确保镀锌扩散退火步骤成功。
在本发明的一个优选实施方案中,铁素体大于或等于5%。在本发明的另一个优选实施方案中,贝氏体大于或等于5%。
根据本发明的冷轧且镀锌扩散退火钢板的抗拉强度TS大于或等于1450MPa。在本发明的一个优选实施方案中,屈服强度YS大于或等于1050MPa。TS和YS根据ISO标准ISO6892-1测量。
根据本发明的钢板可以通过任何适当的制造方法来生产并且本领域技术人员可以限定一种。然而,优选使用包括以下步骤的根据本发明的方法:
提供具有上述钢组成的半成品,其能够被进一步热轧。将半成品加热至1150℃至1300℃的温度,从而使得可以在最终热轧温度FRT为850℃至950℃的情况下容易进行热轧。然后将经热轧的钢冷却并且在250℃至650℃的温度T卷取下进行卷取。
在卷取之后,对板进行酸洗以除去氧化。
将钢板退火至500℃至650℃的退火温度TA并且在所述温度TA下保持保持时间tA以改善可冷轧性。
在退火之后,可以对板进行酸洗以除去氧化。
然后以20%至80%的压下率将钢板冷轧以获得厚度可以为例如0.7mm至3mm或者甚至更好在0.8mm至2mm的范围内的经冷轧的钢板。冷轧压下率优选为20%至80%。低于20%,不利于随后热处理期间的再结晶,这可能损害冷轧且镀锌扩散退火钢板的延性。高于80%,冷轧期间变形所需的力将过高。
然后将经冷轧的钢板再加热至Ac1至Ac3的均热温度T均热并且在所述温度T均热下保持30秒至200秒的保持时间t均热,从而在该临界均热结束时获得包含85%至95%的奥氏体和5%至15%的铁素体的显微组织。
然后将经冷轧的钢板冷却至440℃至480℃的温度以使所述板在将通过在450℃至480℃的温度TZn下的锌浴中进行连续浸渍而被涂覆之前达到接近于涂覆浴的温度。然后将经热浸涂覆的钢板再加热至510℃至550℃的镀锌扩散退火温度TGA,并且在所述温度TGA下保持10秒至30秒的保持时间tGA。
然后将钢板冷却至室温以获得冷轧且镀锌扩散退火钢板。
在本发明的一个优选实施方案中,经热轧的钢板的退火步骤通过在500℃至650℃的热处理温度TA下在惰性气氛中分批并且在所述TA温度下保持1800秒至36000秒的保持时间tA来进行。
在本发明的另一个优选实施方案中,经热轧的钢板的退火步骤通过在550℃至650℃的热处理温度TA下进行连续退火并且在所述TA温度下保持30秒至100秒的保持时间tA来进行。
现在将通过决不是限制性的以下实施例来举例说明本发明。
实施例
将其组成汇总在表1中的2个牌号铸造成半成品并且按照表2中汇总的过程参数加工成钢板。
表1-组成
所测试的组成汇总在下表中,其中元素含量以重量百分比表示。
钢A为根据本发明的。钢B为在本发明之外的。
下划线值:不对应于本发明
对于给定的钢,通过膨胀法测试和金相法分析来测量Ac1和Ac3。
表2-过程参数
将铸造的钢半成品再加热至1200℃,在910℃的精轧温度FRT的情况下进行热轧,在550℃的温度T卷取下进行卷取。将一些钢板首先退火至600℃的温度TA,并且在所述TA温度下保持保持时间tA,然后酸洗。然后以45%的压下率将钢板冷轧。将经冷轧的钢板再加热至均热温度T均热并且在所述温度下保持t均热的时间,并且通过在460℃的温度TZn下的锌浴中进行热浸涂覆来对其进行涂覆,然后在510℃至550℃的镀锌扩散退火温度TGA的情况下进行镀锌扩散退火并且在所述温度下保持20秒的tGA时间。施加以下特定条件:
下划线值:不对应于本发明
在均热之后分析经冷轧的钢板并且相应的显微组织成分汇总在表3中。
表3:均热之后的经冷轧的钢板的显微组织
试验品 | 奥氏体(%) | 铁素体(%) |
1 | 94 | 6 |
2 | 94 | 6 |
3 | 100 | 0 |
4 | 100 | 0 |
5 | 90 | 10 |
下划线值:不对应于本发明
为了量化均热结束时的该显微组织,在均热之后将钢板淬火以使100%的奥氏体转变成马氏体,奥氏体在室温下是不稳定的。马氏体量由此对应于均热结束时的奥氏体量。然后通过图像分析来量化马氏体和铁素体量。
然后分析冷轧且镀锌扩散退火钢板并且相应的显微组织成分和特性分别汇总在表4和表5中。
表4:冷轧且镀锌扩散退火钢板的显微组织
下划线值:不对应于本发明
通过以下方法确定表面分数:从冷轧且镀锌扩散退火钢板中切割试样,抛光并用试剂(硝酸乙醇溶液,Nital)进行蚀刻以露出显微组织。用通过光学显微镜的图像分析来进行各组成的表面分数的确定:马氏体具有比铁素体和贝氏体更暗的对比度。通过测量均热之后淬火的样品的马氏体分数与镀锌扩散退火之后冷却的样品的马氏体分数的差来量化贝氏体。由于该贝氏体内部的碳化物,因此识别贝氏体。
表5:冷轧且镀锌扩散退火钢板的特性
试验品 | TS(MPa) | YS(MPa) | GA成功 |
1 | 1522 | 1095 | 是 |
2 | 1634 | 1055 | 是 |
3 | 1519 | 1163 | 否 |
4 | 1611 | 1096 | 否 |
5 | 1363 | 954 | 是 |
下划线值:不足的TS或YS,或者镀锌扩散退火步骤失败。
通过测量涂层中的铁的量来检查镀锌扩散退火步骤的成功。如果涂层中的铁含量为7%至12%,则所述钢是镀锌扩散退火的。
实施例表明根据本发明的钢板即实施例1和2由于其特定组成和显微组织而成为表现出所有目标机械特性和镀锌扩散退火成功的唯一钢板。由于80%至90%的马氏体,因此确保了机械特性。由于总计10%至20%的铁素体和贝氏体的存在,因此确保了镀锌扩散退火步骤。
在试验品3和4中,在高于温度T均热下将钢A加热,从而在均热结束时确保85%至95%的奥氏体和5%至15%的铁素体,因此形成过多奥氏体和不足的铁素体。这导致在热浸涂覆结束时形成总和少于10%的铁素体和贝氏体,这阻碍了镀锌扩散退火步骤。
在试验品5中,作为使贝氏体转变延迟的硬化元素的钼的缺少,导致在热浸涂覆结束时形成总和为25%的铁素体和贝氏体。然后,在最后的冷却步骤期间形成的马氏体少于80%,这导致了低的机械特性值。
Claims (7)
1.一种冷轧且镀锌扩散退火钢板,所述钢板具有以重量%计包含以下的化学组成:
C:0.15-0.25%
Mn:2.4-3.5%
Si:0.30-0.90%
Cr:0.30-0.70%
Mo:0.05-0.35%
Al:0.001-0.09%
Ti:0.01-0.06%
B:0.0010-0.0040%
Nb 0.01-0.05%
P≤0.020%
S≤0.010%
N≤0.008%
所述组成的剩余部分为铁和由熔炼引起的不可避免的杂质,所述钢板具有以表面分数计由以下组成的显微组织:
-80%至90%的马氏体,
-余量为铁素体和贝氏体,
其中抗拉强度大于或等于1450MPa。
2.根据权利要求1所述的冷轧且镀锌扩散退火钢板,其中所述铁素体大于或等于5%。
3.根据权利要求1所述的冷轧且镀锌扩散退火钢板,其中所述贝氏体大于或等于5%。
4.根据权利要求1至3中任一项所述的冷轧且镀锌扩散退火钢板,其中硅含量为0.30%至0.70%。
5.一种用于制造冷轧且镀锌扩散退火钢板的方法,包括以下顺序步骤:
-对钢进行铸造以获得半成品,所述半成品具有根据权利要求1所述的组成,
-将板坯再加热至1150℃至1300℃的温度T再加热,
-在850℃至950℃的终轧温度的情况下将经再加热的板坯热轧,从而获得经热轧的钢板,然后
-将所述钢板冷却至250℃至650℃的卷取温度T卷取,然后
-将所述钢板在所述温度T卷取下进行卷取,从而获得经卷取的钢板,然后
-对所述钢板进行酸洗
-将所述钢板退火至500℃至650℃的退火温度TA并且将所述钢板在所述温度TA下保持保持时间tA
-任选地对所述钢板进行酸洗
-以20%至80%的压下率将所述经热轧的钢板冷轧以获得经冷轧的钢板,
-将所述经冷轧的钢板加热至Ac1至Ac3的均热温度T均热并且将所述钢板在所述温度T均热下保持30秒至200秒的保持时间t均热以获得85%至95%的奥氏体和5%至15%的铁素体,
-将所述钢板冷却至440℃至480℃的温度,
-通过在450℃至480℃的温度TZn下的锌浴中进行连续浸渍来对所述钢板进行涂覆,
-将所述钢板再加热至510℃至550℃的镀锌扩散退火温度TGA,并且将所述钢板在所述温度TGA下保持10秒至30秒的保持时间tGA
-将经再加热的钢板冷却至室温以获得冷轧且镀锌扩散退火钢板。
6.根据权利要求5所述的用于制造冷轧且镀锌扩散退火钢板的方法,其中所述经热轧的钢板的所述退火通过在500℃至650℃的热处理温度TA下在惰性气氛中分批进行,在所述退火温度下的持续时间tA为1800秒至36000秒。
7.根据权利要求5所述的用于制造冷轧且镀锌扩散退火钢板的方法,其中所述经热轧的钢板的所述退火通过在550℃至650℃的热处理温度TA下进行连续退火来进行,在所述退火温度下的持续时间tA为30秒至100秒。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IB2020/051750 WO2021176249A1 (en) | 2020-03-02 | 2020-03-02 | High strength cold rolled and galvannealed steel sheet and manufacturing process thereof |
IBPCT/IB2020/051750 | 2020-03-02 | ||
PCT/IB2021/050994 WO2021176285A1 (en) | 2020-03-02 | 2021-02-08 | High strength cold rolled and galvannealed steel sheet and manufacturing process thereof |
Publications (2)
Publication Number | Publication Date |
---|---|
CN115066507A CN115066507A (zh) | 2022-09-16 |
CN115066507B true CN115066507B (zh) | 2023-12-22 |
Family
ID=69770986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202180013081.7A Active CN115066507B (zh) | 2020-03-02 | 2021-02-08 | 高强度冷轧且镀锌扩散退火钢板及其制造方法 |
Country Status (10)
Country | Link |
---|---|
US (1) | US20230141248A1 (zh) |
EP (1) | EP4114994B1 (zh) |
JP (1) | JP2023508240A (zh) |
KR (1) | KR20220128659A (zh) |
CN (1) | CN115066507B (zh) |
BR (1) | BR112022014638A2 (zh) |
CA (1) | CA3167692A1 (zh) |
MX (1) | MX2022010798A (zh) |
WO (2) | WO2021176249A1 (zh) |
ZA (1) | ZA202207671B (zh) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023073411A1 (en) * | 2021-10-29 | 2023-05-04 | Arcelormittal | Cold rolled and heat treated steel sheet and a method of manufacturing thereof |
CN117004878A (zh) * | 2022-04-29 | 2023-11-07 | 宝山钢铁股份有限公司 | 一种抗拉强度在1450MPa以上的超高强度冷轧钢带及其制造方法 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106471147A (zh) * | 2014-06-06 | 2017-03-01 | 安赛乐米塔尔公司 | 高强度多相钢、生产方法和用途 |
CN106661653A (zh) * | 2014-07-03 | 2017-05-10 | 安赛乐米塔尔公司 | 用于制造高强度钢板的方法和获得的板 |
CN107580634A (zh) * | 2015-05-06 | 2018-01-12 | 蒂森克虏伯钢铁欧洲股份公司 | 扁钢产品及其生产方法 |
CN108431241A (zh) * | 2015-12-21 | 2018-08-21 | 安赛乐米塔尔公司 | 用于生产具有改进的延展性和可成形性的高强度经涂覆钢板的方法和获得的经涂覆钢板 |
CN108463340A (zh) * | 2016-01-18 | 2018-08-28 | 安赛乐米塔尔公司 | 具有优异的可成形性的高强度钢板及其制造方法 |
CN110088320A (zh) * | 2016-12-21 | 2019-08-02 | 安赛乐米塔尔公司 | 具有优异的可成形性的经回火和涂覆的钢板及其制造方法 |
CN110643800A (zh) * | 2019-10-22 | 2020-01-03 | 马鞍山钢铁股份有限公司 | 一种1200MPa级热轧高强双相钢板及其制造方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5862651B2 (ja) * | 2013-12-18 | 2016-02-16 | Jfeスチール株式会社 | 耐衝撃性および曲げ加工性に優れた高強度溶融亜鉛めっき鋼板およびその製造方法 |
US10590503B2 (en) * | 2013-12-18 | 2020-03-17 | Jfe Steel Corporation | High-strength galvanized steel sheet and method for manufacturing the same |
JP6093411B2 (ja) * | 2015-01-09 | 2017-03-08 | 株式会社神戸製鋼所 | めっき性、加工性、および耐遅れ破壊特性に優れた高強度めっき鋼板、並びにその製造方法 |
JP6187710B2 (ja) | 2015-06-11 | 2017-08-30 | 新日鐵住金株式会社 | 合金化溶融亜鉛めっき鋼板およびその製造方法 |
US11319622B2 (en) | 2018-03-26 | 2022-05-03 | Kobe Steel, Ltd. | High-strength steel sheet and high-strength galvanized steel sheet |
-
2020
- 2020-03-02 WO PCT/IB2020/051750 patent/WO2021176249A1/en active Application Filing
-
2021
- 2021-02-08 EP EP21703775.3A patent/EP4114994B1/en active Active
- 2021-02-08 KR KR1020227028588A patent/KR20220128659A/ko unknown
- 2021-02-08 US US17/907,836 patent/US20230141248A1/en active Pending
- 2021-02-08 JP JP2022552553A patent/JP2023508240A/ja active Pending
- 2021-02-08 WO PCT/IB2021/050994 patent/WO2021176285A1/en unknown
- 2021-02-08 BR BR112022014638A patent/BR112022014638A2/pt unknown
- 2021-02-08 MX MX2022010798A patent/MX2022010798A/es unknown
- 2021-02-08 CA CA3167692A patent/CA3167692A1/en active Pending
- 2021-02-08 CN CN202180013081.7A patent/CN115066507B/zh active Active
-
2022
- 2022-07-11 ZA ZA2022/07671A patent/ZA202207671B/en unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106471147A (zh) * | 2014-06-06 | 2017-03-01 | 安赛乐米塔尔公司 | 高强度多相钢、生产方法和用途 |
CN106661653A (zh) * | 2014-07-03 | 2017-05-10 | 安赛乐米塔尔公司 | 用于制造高强度钢板的方法和获得的板 |
CN107580634A (zh) * | 2015-05-06 | 2018-01-12 | 蒂森克虏伯钢铁欧洲股份公司 | 扁钢产品及其生产方法 |
CN108431241A (zh) * | 2015-12-21 | 2018-08-21 | 安赛乐米塔尔公司 | 用于生产具有改进的延展性和可成形性的高强度经涂覆钢板的方法和获得的经涂覆钢板 |
CN108463340A (zh) * | 2016-01-18 | 2018-08-28 | 安赛乐米塔尔公司 | 具有优异的可成形性的高强度钢板及其制造方法 |
CN110088320A (zh) * | 2016-12-21 | 2019-08-02 | 安赛乐米塔尔公司 | 具有优异的可成形性的经回火和涂覆的钢板及其制造方法 |
CN110643800A (zh) * | 2019-10-22 | 2020-01-03 | 马鞍山钢铁股份有限公司 | 一种1200MPa级热轧高强双相钢板及其制造方法 |
Also Published As
Publication number | Publication date |
---|---|
ZA202207671B (en) | 2023-04-26 |
US20230141248A1 (en) | 2023-05-11 |
EP4114994B1 (en) | 2024-03-27 |
WO2021176285A1 (en) | 2021-09-10 |
JP2023508240A (ja) | 2023-03-01 |
BR112022014638A2 (pt) | 2022-09-13 |
MX2022010798A (es) | 2022-09-27 |
CA3167692A1 (en) | 2021-09-10 |
CN115066507A (zh) | 2022-09-16 |
WO2021176249A1 (en) | 2021-09-10 |
EP4114994A1 (en) | 2023-01-11 |
KR20220128659A (ko) | 2022-09-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5402007B2 (ja) | 加工性に優れた高強度溶融亜鉛めっき鋼板およびその製造方法 | |
JP5332355B2 (ja) | 高強度溶融亜鉛めっき鋼板およびその製造方法 | |
JP3527092B2 (ja) | 加工性の良い高強度合金化溶融亜鉛めっき鋼板とその製造方法 | |
US20090202382A1 (en) | High manganese steel strips with excellent coatability and superior surface property, coated steel strips using steel strips and method for manufacturing the steel strips | |
US10351942B2 (en) | Hot-dip galvannealed hot-rolled steel sheet and process for producing same | |
KR102432167B1 (ko) | 고강도 강 시트의 제조 방법 및 상기 방법에 의해 획득된 시트 | |
KR102548555B1 (ko) | 냉간 압연 및 열 처리된 강판 및 냉간 압연 및 열 처리된 강판의 제조 방법 | |
JPH0693340A (ja) | 伸びフランジ性の優れた高強度合金化溶融亜鉛めっき鋼板の製造方法及び製造設備 | |
US20210025024A1 (en) | High strength hot rolled or cold rolled and annealed steel and method of producing it | |
JP3812279B2 (ja) | 加工性および歪時効硬化特性に優れた高降伏比型高張力溶融亜鉛めっき鋼板およびその製造方法 | |
CN115066507B (zh) | 高强度冷轧且镀锌扩散退火钢板及其制造方法 | |
US20230295762A1 (en) | Hot-pressed member and method for producing the same | |
JP6384623B2 (ja) | 高強度鋼板およびその製造方法 | |
RU2742998C1 (ru) | Сверхпрочная многофазная сталь и способ изготовления стальной полосы из этой многофазной стали | |
JP5853884B2 (ja) | 溶融亜鉛めっき鋼板およびその製造方法 | |
US20230002870A1 (en) | Method of hot press forming a steel article and steel article | |
CN110073023B (zh) | 弯曲性和延伸凸缘性优异的高张力钢及其制造方法 | |
JP2003193189A (ja) | 深絞り性に優れた複合組織型高張力溶融亜鉛めっき鋼板およびその製造方法 | |
JP2002226942A (ja) | 深絞り性に優れた複合組織型高張力溶融亜鉛めっき鋼板およびその製造方法 | |
RU2795257C1 (ru) | Высокопрочный холоднокатаный и отожжённый оцинкованный стальной лист и способ его изготовления | |
JP2000109965A (ja) | 加工性に優れた溶融亜鉛めっき高張力鋼板の製造方法 | |
JPH06145893A (ja) | 延性と耐遅れ破壊特性に優れた高強度溶融亜鉛めっき鋼板およびその製造方法 | |
JP4325233B2 (ja) | 深絞り性と歪時効硬化性に優れた複合組織型高張力冷延鋼板および溶融亜鉛めっき鋼板ならびにそれらの製造方法 | |
WO2023281035A1 (en) | High strength coated dual phase steel strip and method to produce it | |
KR20100066798A (ko) | 신장플랜지성이 우수한 고강도 냉연강판, 용융아연도금강판및 합금화용융아연도금강판 및 그 제조방법 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |