CN114525452B - 屈服强度700Mpa级热镀锌低合金高强钢及制备方法 - Google Patents
屈服强度700Mpa级热镀锌低合金高强钢及制备方法 Download PDFInfo
- Publication number
- CN114525452B CN114525452B CN202210118791.2A CN202210118791A CN114525452B CN 114525452 B CN114525452 B CN 114525452B CN 202210118791 A CN202210118791 A CN 202210118791A CN 114525452 B CN114525452 B CN 114525452B
- Authority
- CN
- China
- Prior art keywords
- percent
- hot
- equal
- alloy high
- dip galvanized
- 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
Images
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
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
-
- 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
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- 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
- C21D2211/003—Cementite
-
- 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
- C21D2211/009—Pearlite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
本发明公开了一种屈服强度700Mpa级热镀锌低合金高强钢及制备方法,钢板的化学成分及重量百分数为:C:0.07~0.12%;Si:0.2~0.5%;Mn:1.1~1.5%;Nb:0.02~0.06%;Ti:0.06~0.12%;P≤0.020%;S≤0.012%;Als:0.02~0.06%;N≤0.006%,其余为Fe及不可避免杂质。制备方法包括冶炼、热轧、冷轧、热镀锌工序。本发明通过低碳及Nb、Ti微合金化成分的合理设计,匹配热轧轧制、冷轧压下率、热浸镀连续退火工艺和投用一定量的光整机延伸,强化钢板析出强化作用,获得组织均匀、机械性能稳定、冷弯性能良好、高耐腐蚀性的热镀锌低合金高强钢。
Description
技术领域
本发明属于汽车用热镀锌高强钢制造技术领域,具体涉及一种屈服强度700Mpa级热镀锌低合金高强钢及制备方法。
背景技术
随着汽车行业的高速发展,对车身安全性、节能减排、耐抗腐能力提升等方面的追求已成为必然趋势,高强钢在汽车的使用量迅速提高。镀锌低合金高强钢具有较高的强度、良好的成型性、焊接性能和耐腐蚀能力,主要应用车身结构件和加强件。
目前,镀锌低合金高强钢研究与应用的屈服强度级别大多在500MPa以下,屈服强度700MPa级镀锌低合金高强钢尚未有研究,随着车身高强钢应用比例不断提高,500MPa级以下低合金高强钢已不能满足车身轻量化、安全性的迫切需求。
公开号为CN111074165的中国专利公开了一种700MPa级高强汽车钢热轧酸洗板及其生产方法,该发明属于热轧酸洗产品,成品较厚(2~16mm),700MPa级力学性能指标为抗拉强度,因酸洗产品未经冷轧镀锌工序表面涂渡处理,厚规格尺寸精度控制难度大,存在表面质量差、耐腐蚀能力低、尺寸精度较差,不能满足汽车轻量化、高耐腐蚀性要求。
公开号为CN103014539的中国专利;公开了一种屈服强度700MPa级高强度高韧性钢板及其制造方法,该发明属于热轧中厚钢板,钢板组织为回火马氏体和碳化物,非低合金高强钢系列产品钢种,中厚钢板产品不用于车身零件成型,不能满足汽车车身轻量化要求。
因此,开发一种屈服强度700MPa级热镀锌低合金高强钢对推动汽车工业的发展具有重要的意义。
发明内容
本发明要解决的技术问题是提供一种屈服强度700MPa级热镀锌低合金高强钢及制备方法。本发明通过低碳及Nb、Ti微合金化的化学成分设计,匹配合理的生产工艺,强化钢板析出强化作用,获得组织均匀、机械性能稳定、冷弯性能良好、高耐腐蚀性的热镀锌低合金高强钢。
为解决上述技术问题,本发明所采取的技术方案是:一种屈服强度700Mpa级热镀锌低合金高强钢,所述镀锌钢板的化学成分及质量百分数为:C:0.07~0.12%;Si:0.2~0.5%;Mn:1.1~1.5%;Nb:0.02~0.06%;Ti:0.06~0.12%;P≤0.020%;S≤0.012%;Als:0.02~0.06%;N≤0.006%,其余为Fe及不可避免杂质。
进一步的,所述镀锌钢板合金元素的总加入质量不超过2.4%。
进一步的,所述镀锌钢板厚度0.6~2.5mm。
进一步的,所述镀锌钢板的显微组织为铁素体+珠光体+渗碳体,其中铁素体比例60~70%。
进一步的,所述镀锌钢板屈服强度Rp0.2:700~800MPa,抗拉强度Rm≥750MPa,断后延伸率A80≥12%,180°0t折弯不开裂,t为镀锌钢板厚度。
本发明成分设计是在C、Si、Mn固溶强化元素的基础上,通过添加具有细晶强化和析出强化作用的微合金元素Nb、Ti,以及能起到脱氧和细化晶粒的Als元素,严格控制P、S、N杂质元素含量,并设计合理的关键生产工艺,实现钢的细晶强化、析出强化和相变强化,从而获得具有较高屈服强度性能优良的热镀锌低合金高强钢。
以下是本发明所涉及主要成分的作用及其限定说明:
C:碳是钢铁材料中有效的固溶强化元素,增加C含量能大幅提高钢的强度,但C含量过高时,钢的塑性下降、焊接性能恶化,C含量过低时,材料强度难以保证。本发明C含量限定在0.07~0.12%。
Si:硅能固溶于铁素体和奥氏体中提高钢的强度,其作用仅次于C、P,可以抑制铁素体中碳化物的析出,使固溶C原子充分向奥氏体中富集,提高材料稳定性。然而Si含量过高时,易在加热炉内形成难以去除的氧化铁皮,退火过程中易导致表面元素富集,影响镀后表面质量。本发明Si含量限定在0.2~0.5%。
Mn:锰是良好的脱氧剂和脱硫剂,也是钢中常用的固溶强化元素,Mn易与S形成高熔点MnS,削弱由于FeS引起的热脆现场,改善加工性能。Mn同时也是奥氏体的稳定元素,可有效抑制奥氏体再结晶,Mn与C结合形成多种碳化物起到沉淀强化的作用,溶于基体增强固溶强化效果,但Mn元素过高,易在退火过程中形成大量锰化物,导致镀层质量下降。本发明中Mn含量限定在1.1~1.5%。
Nb:铌对相变转化行为、铁素体形核有重要作用,在钢种起到细化晶粒和析出强化的作用,本发明中Nb含量限定在0.02~0.06%。
Ti:钛是强化元素,在钢种起细晶强化和析出强化作用,同时Ti也是强固N元素,可有效抑制高温加热、轧制中奥氏体晶粒长大,本发明Ti含量限定在0.06~0.12%。
P:在钢中为杂质元素,要求≤0.020%。
S:在钢中为杂质元素,要求≤0.012%。
Als:在钢中起到脱氧和细化晶粒作用,本发明Als含量限定在0.02~0.06%。
N:在钢中为杂质元素,要求≤0.006%。
本发明还提供上述屈服强度700Mpa级热镀锌低合金高强钢的制备方法,所述制备方法包括冶炼、热轧、冷轧、热镀锌工序;所述热轧工序,将板坯加热至1200~1250℃,精轧开轧温度1000~1100℃,终轧温度控制在870~910℃,轧后通过层流冷却系统冷却至520~570℃卷取。
进一步的,所述热镀锌工序,退火方式采用连续退火,控制退火均热温度为750~780℃,缓冷温度650~700℃,锌液温度为455~465℃,光整机延伸率0.2~0.4%。
进一步的,所述板坯化学成分及重量百分数为:C:0.07~0.12%;Si:0.2~0.5%;Mn:1.1~1.5%;Nb:0.02~0.06%;Ti:0.06~0.12%;P≤0.020%;S≤0.012%;Als:0.02~0.06%;N≤0.006%,其余为Fe及不可避免杂质。
进一步的,所述冶炼工序,采用转炉冶炼,LF+RH双联,连铸后获得板坯。
进一步的,所述冷轧工序,压下率控制在45~70%。
本发明生产工艺中,热轧工序,使用所述热轧卷取温度,可保证Nb、Ti复合低合金高强钢中碳、氮化物能够以较大的过冷度析出,保证析出物呈弥散状分布,达到保证成品屈服与抗拉强度的目的。热镀锌工序,镀锌连续退火炉均热温度控制为750~780℃,可有效消除冷态纤维状组织,防止晶粒粗化,使组织成分均匀化;控制缓冷温度为650~700℃,使奥氏体发生铁素体相变,使C向奥氏体内集中,提升淬透性,控制带钢入锌锅温度450~460℃,锌液温度为455~465℃,奥氏体经适当的冷速发生珠光体转变,光整延伸率0.2~0.4%,确保一定的变形程度后消除屈服平台,提升屈服强度,改善加工性能。
采用上述技术方案所产生的有益效果在于:1、本发明提供了一种屈服强度700MPa级热镀锌低合金高强及制备方法,屈服强度Rp0.2:700MPa~800MPa,抗拉强度Rm≥750MPa,断后延伸率A80≥12%,180°0t折弯不开裂。2、本发明通过低碳及Nb、Ti微合金化成分的合理设计,匹配热轧轧制、冷轧压下率、热浸镀连续退火工艺和投用一定量的光整机延伸,强化钢板析出强化作用,获得组织均匀、机械性能稳定、冷弯性能良好的0.6~2.5mm厚的热镀锌低合金高强钢,可满足汽车工业轻量化、安全性、高耐腐蚀性的发展需求,可广泛应用于车身加强件和结构件。
附图说明
图1为实施例1所生产的镀锌钢板金相组织(1000×);
图2为实施例2所生产的镀锌钢板金相组织(1000×);
图3为实施例3所生产的镀锌钢板金相组织(1000×);
图4为实施例4所生产的镀锌钢板金相组织(1000×);
图5为实施例5所生产的镀锌钢板金相组织(1000×)。
具体实施方式
下面结合具体实施例1~5对本发明进一步详细地说明。
实施例1~5
本发明屈服强度700Mpa级热镀锌低合金高强钢的制备方法包括冶炼、热轧、冷轧、热镀锌工序;具体操作步骤如下:
(1)冶炼:通过转炉冶炼得到符合要求的炼钢成分,钢水经LF+RH双联处理后连续浇铸得到板坯,实施例1~5板坯化学成分如表1所示(镀锌钢板的化学成分相同)。
表1 实施例1~5板坯化学成分质量百分含量(wt%)
注:表1中成分余量为Fe及不可避免杂质。
(2)热轧:将连铸板坯送加热炉加热至1200~1250℃,精轧开轧温度1000~1100℃,终轧温度控制在870~910℃,轧后通过层流冷却系统冷却至520~570℃卷取。使用所述热轧卷取温度,可保证Nb、Ti复合低合金高强钢中碳、氮化物能够以较大的过冷度析出,保证析出物呈弥散状分布,达到保证成品屈服与抗拉强度的目的,实施例1~5热轧工艺参数见表2。
表2 实施例1~5热轧工艺控制参数及冷轧压下率
(3)酸轧:将热轧钢卷在酸洗冷轧机组进行酸洗轧制,冷轧压下率为45~70%,实施例1~5冷轧压下率见表2。
(4)热镀锌:将经过冷轧后的轧硬状态的钢带进行脱脂清洗,然后在退火炉内在线连续退火处理,控制均热温度为750~780℃,控制缓冷温度为650~700℃,带钢速度为60~100m/min,钢带入锌锅温度450~460℃,锌液温度为455~465℃,光整延伸率0.2~0.4%,锌锅锌液温度波动控制≤±5℃,锌锅铝含量0.18~0.28%。
镀锌连续退火炉均热温度控制为750~780℃,可有效消除冷态纤维状组织,防止晶粒粗化,使组织成分均匀化;控制缓冷温度为650~700℃,使奥氏体发生铁素体相变,使C向奥氏体内集中,提升淬透性,控制带钢入锌锅温度450~460℃,奥氏体经适当的冷速发生珠光体转变,光整延伸率0.2~0.4%,确保一定的变形程度后消除屈服平台,提升屈服强度,改善加工性能。实施例1~5镀锌工艺参数见表3。
表3 实施例1~5镀锌工艺控制参数
将本发明实施例1~5得到的冷轧镀锌钢板按照《GB/T 228.1-2010 金属材料拉伸试验第1部分:室温试验方法》进行拉伸试验。实施例1~5得到的热镀锌低合金高强钢的横向80标距力学性能见表4。
表4 实施例1~5镀锌低合金高强钢的力学性能、厚度及铁素体比例
从拉伸检测结果结果来看,采用本发明技术方案得到的700Mpa级热镀锌低合金高强钢屈服强度700~800Mpa,抗拉强度≥750Mpa,断后伸长率A80≥12%。且钢板180°0t 折弯不开裂,t为钢板厚度。
实施例1~5制备的700Mpa级热镀锌低合金高强钢钢板金相组织见图1~图5,从金相组织可看出根据本发明生产的镀锌钢板显微组织为铁素体+珠光体+渗碳体,组织均匀。
以上实施例仅用以说明而非限制本发明的技术方案,尽管参照上述实施例对本发明进行了详细说明,本领域的普通技术人员应当理解:依然可以对本发明进行修改或者等同替换,而不脱离本发明的精神和范围的任何修改或局部替换,其均应涵盖在本发明的权利要求范围当中。
Claims (8)
1.屈服强度700Mpa级热镀锌低合金高强钢,其特征在于,所述镀锌钢板的化学成分及质量百分数为:C:0.07~0.12%;Si:0.2~0.5%;Mn:1.1~1.5%;Nb:0.02~0.06%;Ti:0.06~0.12%;P≤0.020%;S≤0.012%;Als:0.02~0.06%;N≤0.006%,其余为Fe及不可避免杂质;
所述镀锌钢板屈服强度Rp0.2:700~800MPa,抗拉强度Rm≥750MPa,断后延伸率A80≥12%,180°0t折弯不开裂,t为镀锌钢板厚度。
2.根据权利要求1所述的屈服强度700Mpa级热镀锌低合金高强钢,其特征在于,所述镀锌钢板合金元素的总加入质量不超过2.4%。
3.根据权利要求1或2所述的屈服强度700Mpa级热镀锌低合金高强钢,其特征在于,所述镀锌钢板厚度0.6~2.5mm。
4.根据权利要求1或2所述的屈服强度700Mpa级热镀锌低合金高强钢,其特征在于,所述镀锌钢板的显微组织为铁素体+珠光体+渗碳体,其中铁素体比例60~70%。
5.基于权利要求1-4任意一项所述的屈服强度700Mpa级热镀锌低合金高强钢的制备方法,其特征在于,所述制备方法包括冶炼、热轧、冷轧、热镀锌工序;所述热轧工序,将板坯加热至1200~1250℃,精轧开轧温度1000~1100℃,终轧温度控制在870~910℃,轧后通过层流冷却系统冷却至520~570℃卷取;
所述热镀锌工序,退火方式采用连续退火,控制退火均热温度为750~780℃,缓冷温度650~700℃,锌液温度为455~465℃,光整机延伸率0.2~0.4%。
6.根据权利要求5所述的屈服强度700Mpa级热镀锌低合金高强钢的制备方法,其特征在于,所述板坯化学成分及重量百分数为:C:0.07~0.12%;Si:0.2~0.5%;Mn:1.1~1.5%;Nb:0.02~0.06%;Ti:0.06~0.12%;P≤0.020%;S≤0.012%;Als:0.02~0.06%;N≤0.006%,其余为Fe及不可避免杂质。
7.根据权利要求5所述的屈服强度700Mpa级热镀锌低合金高强钢的制备方法,其特征在于,所述冶炼工序,采用转炉冶炼,LF+RH双联,连铸后获得板坯。
8.根据权利要求5所述的屈服强度700Mpa级热镀锌低合金高强钢的制备方法,其特征在于,所述冷轧工序,压下率控制在45~70%。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202210118791.2A CN114525452B (zh) | 2022-02-08 | 2022-02-08 | 屈服强度700Mpa级热镀锌低合金高强钢及制备方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202210118791.2A CN114525452B (zh) | 2022-02-08 | 2022-02-08 | 屈服强度700Mpa级热镀锌低合金高强钢及制备方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN114525452A CN114525452A (zh) | 2022-05-24 |
CN114525452B true CN114525452B (zh) | 2023-04-28 |
Family
ID=81622445
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202210118791.2A Active CN114525452B (zh) | 2022-02-08 | 2022-02-08 | 屈服强度700Mpa级热镀锌低合金高强钢及制备方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN114525452B (zh) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115261738B (zh) * | 2022-07-28 | 2023-08-15 | 马鞍山钢铁股份有限公司 | 一种镀层粘附性优良的560MPa级镀锌高强钢板及其生产方法 |
CN115198202B (zh) * | 2022-09-19 | 2022-12-27 | 苏州创镕新材料科技有限公司 | 车用油箱托架的700MPa级高强减薄材料及其制备方法 |
CN116103580A (zh) * | 2022-12-30 | 2023-05-12 | 鞍钢蒂森克虏伯汽车钢有限公司 | 高加工硬化率的420MPa级低合金高强钢及制造方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3812279B2 (ja) * | 2000-04-21 | 2006-08-23 | Jfeスチール株式会社 | 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 |
JP4959161B2 (ja) * | 2005-09-05 | 2012-06-20 | 新日本製鐵株式会社 | 耐食性と伸びと穴拡げ性に優れた溶融亜鉛めっき鋼板および合金化溶融亜鉛めっき鋼板 |
JP5884714B2 (ja) * | 2012-01-31 | 2016-03-15 | Jfeスチール株式会社 | 溶融亜鉛めっき鋼板およびその製造方法 |
CN110777290B (zh) * | 2019-11-22 | 2021-03-19 | 甘肃酒钢集团宏兴钢铁股份有限公司 | 一种热浸镀锌铝镁高强钢、制备方法及应用 |
CN113403550B (zh) * | 2021-05-21 | 2022-08-16 | 鞍钢股份有限公司 | 高塑性耐疲劳的冷轧热镀锌dh1180钢板及制备方法 |
-
2022
- 2022-02-08 CN CN202210118791.2A patent/CN114525452B/zh active Active
Also Published As
Publication number | Publication date |
---|---|
CN114525452A (zh) | 2022-05-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN109097705B (zh) | 一种800MPa级冷轧热镀锌双相钢及其生产方法 | |
CN111748745B (zh) | 780MPa级具有较高成形性的冷轧热镀锌双相钢及其制造方法 | |
CN112048681B (zh) | 一种980MPa级高成形性冷轧DH钢及其制备方法 | |
CN111979489B (zh) | 一种780MPa级高塑性冷轧DH钢及其制备方法 | |
CN112048680B (zh) | 一种合金化热镀锌dh980钢及其制备方法 | |
CN114525452B (zh) | 屈服强度700Mpa级热镀锌低合金高强钢及制备方法 | |
CN110172640B (zh) | 500MPa级高加工硬化率热镀锌双相钢板及其制备方法 | |
CN104561812A (zh) | 一种1000MPa级高铝热镀锌双相钢及其制备方法 | |
CN113737087B (zh) | 一种超高强双相钢及其制造方法 | |
WO2022206911A1 (zh) | 抗拉强度≥1180MPa的低碳低合金Q&P钢或热镀锌Q&P钢及其制造方法 | |
CN112680655B (zh) | 700MPa级汽车用低合金高强冷轧钢板及制备方法 | |
CN113416889B (zh) | 焊接性能良好超高强热镀锌dh1470钢及制备方法 | |
CN109023055B (zh) | 一种高强度高成形性汽车钢板及其生产工艺 | |
CN111979488A (zh) | 一种780MPa级合金化热镀锌DH钢及其制备方法 | |
CN113584393A (zh) | 一种抗拉强度780MPa级双相钢及其生产方法 | |
CN114686762B (zh) | 布氏硬度500hbw高强度、高韧性热连轧薄钢板的生产方法 | |
US20240167138A1 (en) | Dual-phase steel and hot-dip galvanized dual-phase steel having tensile strength greater than or equal to 980mpa and method for manufacturing same by means of rapid heat treatment | |
CN109097681B (zh) | 一种高强度低夹杂汽车钢板及其连铸过程电磁搅拌工艺 | |
CN112779474A (zh) | 一种锌基镀层2000MPa级热成形带钢及其生产方法 | |
CN115181889B (zh) | 1180MPa级别低碳低合金热镀锌双相钢及快速热处理热镀锌制造方法 | |
CN113061806A (zh) | 一种1180MPa级轻质高强钢及其制备方法 | |
CN113046644A (zh) | 一种980MPa级轻质高强钢及其制备方法 | |
CN110117756A (zh) | 一种Cu合金化深冲双相钢板及其制备方法 | |
CN116043119B (zh) | 易焊接超高扩孔性能800MPa级热镀锌复相钢及制备方法 | |
CN111534747B (zh) | 宽幅550MPa级热轧集装箱用耐候钢及其制造方法 |
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 |