CN113528931B - 一种钢带及其生产方法 - Google Patents

一种钢带及其生产方法 Download PDF

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CN113528931B
CN113528931B CN202110579383.2A CN202110579383A CN113528931B CN 113528931 B CN113528931 B CN 113528931B CN 202110579383 A CN202110579383 A CN 202110579383A CN 113528931 B CN113528931 B CN 113528931B
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ferrite
pearlite
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CN113528931A (zh
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马光宗
孙璐
马德刚
李建英
王淑华
武冠华
张献
王耐
纪明龙
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Tangshan Steel Group High Strength Automobile Plate Co ltd
Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
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Tangshan Iron and Steel Group Co Ltd
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    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • 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
    • 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
    • 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
    • C21D2211/009—Pearlite

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Abstract

一种钢带，其化学成分及其质量百分含量为：C 0.06～0.10%，Si 0.30～0.50%，Mn 1.00～1.50%，P≤0.025%，S≤0.010%，Als 0.020～0.050%，N≤0.0040%，余量为Fe和不可避免的杂质元素，钢带心部为纤维状贝氏体组织，表层为铁素体和珠光体。本发明钢板在保留心部高位错密度的纤维状组织的同时，通过部分再结晶退火处理，促使表层组织发生再结晶退火，获得细小均匀的铁素体和珠光体组织，实现表层软化的目的。

Description

一种钢带及其生产方法
技术领域
本发明属于钢带生产技术领域，具体涉及一种钢带及其生产方法。
背景技术
汽车冷轧高强钢为保证材料具有良好的强度，通常的做法是添加足够的C、Mn、Nb、Ti、Mo等合金元素中的一个或几个，通过细晶强化、析出强化、相变强化作用实现较高的强度和良好的塑性。为保证晶粒细化、第二相析出、马氏体组织形成等强化因子发挥作用，必须保证有较多的合金加入量，才能实现。对合金元素含量的要求，造成了生产成本的大幅升高。
发明内容
本发明解决的技术问题是，提供一种钢带及其生产方法，钢带生产成本较低，同时具有良好的折弯性能。
为解决以上技术问题，本发明的技术方案是：一种钢带，其化学成分及其质量百分含量为：C 0.06～0.10%，Si 0.30～0.50%，Mn 1.00～1.50%，P≤0.025%，S≤0.010%，Als0.020～0.050%， N≤0.0040%，余量为Fe和不可避免的杂质元素，钢带心部组织为纤维状贝氏体B，表层为铁素体F和珠光体P，双侧表层铁素体F和珠光体P组织总深度占钢带厚度的34%-70%。
进一步的，所述钢带，其化学成分以质量百分含量计还含有 Nb：0.020~0.060%、V：0.01~0.06%、Ti：0.01~0.06%中的任意一种或一种以上。
进一步的，钢带单侧表层铁素体F和珠光体P组织深度占钢带厚度的15%～40%。
上述钢带的生产方法，钢带连续退火过程包括均热段、缓冷段、快冷段、时效段，其特征在于，钢带均热温度640～710℃，快冷开始温度550～600℃，快冷终止温度390～420℃，时效终止温度350～370℃。
进一步的，钢带冷轧过程总压下量≥55%。
采用上述技术方案所产生的有益效果在于：本发明钢板在保留心部高位错密度的纤维状贝氏体组织的同时，通过部分再结晶退火处理，促使表层组织发生再结晶退火，获得细小均匀的铁素体和珠光体组织，实现表层软化的目的。纤维状组织保证了材料具有足够的强度，表层形成的再结晶组织保证了材料具有的良好的塑性，显著提高材料的折弯性能，保证180°弯曲试验d=0a条件下无开裂，最终获得具有良好折弯性能的冷轧高强钢带。
附图说明
图1是钢带整个连续退火过程的工艺示意图。
图2是制成的钢带的显微组织照片的一例，图中标示数据表示钢带单侧表层铁素体和珠光体深度占钢带厚度的15％－40％。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
实施例1－10
将表1所示成分的钢液制成板坯，板坯进行热轧、冷轧，得到厚度为0.5～1.5mm的钢带，然后在表2所示工艺条件下进行连续退火。冷轧过程压下率、轧制制成的钢带厚度规格同样列于表2。
表1
Figure DEST_PATH_IMAGE002
表2
Figure DEST_PATH_IMAGE004
对实施例1－10连续退火护的钢带取样进行力学性能检验，检验结果列于表3，在光学显微镜下对钢带显微组织进行观察，钢带双侧表层F＋P组织总深度、其中一侧表层F＋P组织深度见表3。
表3
Figure DEST_PATH_IMAGE006
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 (3)

1. 一种钢带，其化学成分及其质量百分含量为：C 0.06～0.10%，Si 0.30～0.50%，Mn1.00～1.50%，P≤0.025%，S≤0.010%，Als 0.020～0.050%， N≤0.0040%，以及Nb：0.020~0.060%、V：0.01~0.06%、Ti：0.01~0.06%中的任意一种或两种以上，余量为Fe和不可避免的杂质元素，其特征在于，钢带心部组织为纤维状贝氏体B，表层为铁素体F和珠光体P，双侧表层铁素体F和珠光体P组织总深度占钢带厚度的34%～70%，钢带单侧表层铁素体F和珠光体P组织深度占钢带厚度的15%～40%。
2.根据权利要求1所述的一种钢带的生产方法，钢带连续退火过程包括均热段、缓冷段、快冷段、时效段，其特征在于：所述连续退火为部分再结晶退火；钢带均热温度640～710℃，快冷开始温度550～600℃，快冷终止温度390～420℃，时效终止温度350～370℃。
3.根据权利要求2所述的一种钢带的生产方法，其特征在于，钢带冷轧过程总压下量≥55%。
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CN102199726A (zh) * 2011-05-17 2011-09-28 马鞍山钢铁股份有限公司 热水器内胆用高强度冷轧钢板及其连续退火工艺
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CN112080692A (zh) * 2020-08-26 2020-12-15 包头钢铁（集团）有限责任公司 一种280MPa级冷轧低屈强比冲压汽车结构用钢及其生产方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102199726A (zh) * 2011-05-17 2011-09-28 马鞍山钢铁股份有限公司 热水器内胆用高强度冷轧钢板及其连续退火工艺
CN110551880A (zh) * 2019-10-24 2019-12-10 成都先进金属材料产业技术研究院有限公司 小规格22Si2MnCrNi2MoA钢轧材软化热处理工艺
CN112080692A (zh) * 2020-08-26 2020-12-15 包头钢铁（集团）有限责任公司 一种280MPa级冷轧低屈强比冲压汽车结构用钢及其生产方法

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