CN106834964B - 一种低碳高强度含Cr纳米级贝氏体钢及其制备方法 - Google Patents
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- 229910052758 niobium Inorganic materials 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
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- 229910001566 austenite Inorganic materials 0.000 description 5
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 238000009776 industrial production Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
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- 229910045601 alloy Inorganic materials 0.000 description 2
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- 229910052796 boron Inorganic materials 0.000 description 2
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- C—CHEMISTRY; METALLURGY
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- 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
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Abstract
本发明涉及一种低碳高强度含Cr纳米级贝氏体钢及其制备方法。其技术方案是:将钢坯轧制成板材,将所述板材以5~10℃/s的升温速度加热至980~1020℃,保温10~20min,水冷至410~430℃,再空冷至340~360℃,保温10~20min,然后水冷至室温,制得低碳高强度含Cr纳米级贝氏体钢。所述钢坯化学成分及含量:C为0.23~0.25wt%,Si为1.70~1.93wt%,Mn为1.98~2.02wt%,Mo为0.227~0.230wt%,Cr为0.98~1.02wt%,P<0.008wt%,S<0.002 wt%,N<0.004wt%,其余为Fe及不可避免的杂质。本发明具有成本低廉、周期短和工艺简单的特点,所制备的低碳高强度含Cr纳米级贝氏体钢机械性能优良,广泛应用于工程机械、海洋设施、桥梁、汽车、造船、压力容器等领域。
Description
技术领域
本发明属于低碳高强度贝氏体钢技术领域。尤其涉及一种低碳高强度含Cr纳米级贝氏体钢及其制备方法。
背景技术
低碳高强度贝氏体钢主要应用于工程机械、海洋设施、桥梁、汽车、造船和压力容器等领域,随着科技和经济的发展,对其强度和韧性要求日益提高。现有的低碳贝氏体钢大多添加大量合金元素,如Nb、Ti、Co、Al等,其中有些合金元素价格昂贵,增加了生产成本;此外,现有低碳贝氏体钢的生产工艺大多采用弛豫析出相变技术,或者长时间的控轧控冷等温处理工艺,这些技术虽然可以获得高强度高韧性的低碳贝氏体钢,但工艺比较复杂,生产周期长,降低了生产节奏。
“高性能低碳贝氏体结构钢及其生产方法”(CN200610134087.7)专利技术,其化学成分(wt%)为:C=0.04~0.07%,Si=0.20~0.50%,Mn=1.50~1.80%,Nb=0.03~0.06%,Ti=0.005~0.030%,Cr=0.25~0.50%,Cu=0.30~0.60%,Ni=0.20~0.50%, Als=0.010~0.070%,余量为Fe。其抗拉强度达到590MPa级别,且低温冲击韧性良好。合金元素添加种类复杂,生产采用TMCP+RPC工艺,即热机械控制工艺+弛豫析出控制相变技术,并在冷后回火,生产工艺复杂,生产周期长,而且生产成本提高。
“一种高性能低碳贝氏体钢及生产方法”(CN102071362)专利技术,其化学成分(wt%)为:C=0.03~0.10%,Si=0.05~0.5%,Mn=1.0~2.0%,Cr=0.1~0.5%,Mo=0.1~0.5%,Nb=0.01~0.10%,Ti=0.005~0.10%,Al=0.02~0.06%,余量为Fe。其碳含量较低,所以抗拉强度只能达到725MPa级别,添加了Nb、Ti、Al等合金元素,增加了成本;其冶炼过程需要采用Ca处理,轧制过程采用TMCP两阶段控轧工艺,而且连铸坯堆冷时间超过48小时,生产工艺较为复杂,生产周期长,不利于工业化生产。
“一种含有先共析铁素体的纳米贝氏体钢及其制备方法”(CN 104962824)专利技术,其成分(wt%)为:C=0.68~1.08%,Si=1.9~3.0%,Mn=1.8~3.5%,Cr=1.5~3.1%,Co=1.2~2.8%,P≤0.015%,和S≤0.015%,余量为Fe和伴随的杂质。虽然抗拉强度达到1789MPa,总延伸率为13.8%,但是碳质量百分比高达0.68%,加工成型后机械加工困难,焊接性能很差;而且添加了大量贵重的合金元素Cr和Co,增加了其成本;此外其热处理工艺要在贝氏体转变温度下进行低温变形15%,变形完成后还得进行等温相变3h,工艺复杂且周期较长,不利于工业生产。
“一种低碳纳米贝氏体钢及其制备方法”(CN 104962806)专利技术,其成分(wt%)为:C=0.2~0.49%,Si=1.0~2.1%,Mn=1.5~3.5%,Mo=0.5~1.2%,Al=2.0~4.0%,P≤0.01%,和S≤0.01%,余量为Fe和伴随的杂质。虽然钢的抗拉强度达到了1700MPa,延伸率为13%以上,但是添加了大量贵重的合金元素Mo,增加了成本,此外热处理工艺中采用奥氏体热轧和淬火等温变形0.5-2.5h等两步轧制工艺,工艺复杂,在工业生产中很难实现,不利于大量生产。
由上述分析可以看出:现有的低碳贝氏体钢大多添加了多种合金元素,不仅增加了生产成本,而且生产工艺比较复杂、生产周期长和不适于大规模工业化生产。
发明内容
本发明旨在克服上述技术缺陷,目的是提供一种工艺简单、生产成本低和生产周期短的低碳高强度含Cr纳米级贝氏体钢的制备方法。用该方法制备的低碳高强度含Cr纳米级贝氏体钢机械性能优良。
为实现上述目的,本发明采用的技术方案是:将钢坯轧制成板材,将所述板材以5~10℃/s的升温速度加热至980~1020℃,保温10~20min,水冷至410~430℃,再空冷至340~360℃,保温10~20min,然后水冷至室温,制得低碳高强度含Cr纳米级贝氏体钢。
所述钢坯的化学成分及其含量是:C为0.23~0.25wt%,Si为1.70~1.93wt%,Mn为1.98~2.02wt%,Mo为0.227~0.230wt%,Cr为0.98~1.02wt%,P<0.008wt%,S<0.002 wt%,N<0.004wt%,其余为Fe及不可避免的杂质。
由于采用上述技术方案,本发明与现有技术相比具有如下积极效果:
本发明以价格低廉的C、Si、Mn元素为主,不需要添加Nb、Ti、Ni和B等贵重合金元素,故成本低廉;本发明向低碳钢中添加适量Cr提高钢的淬透性,避免高温铁素体的转变,促进更多过冷奥氏体向贝氏体转变;控制贝氏体转变在低温下进行,短周期内获得几乎全部的纳米级板条贝氏体组织,提高制品的强度及韧性。
本发明制备的低碳高强度含Cr纳米级贝氏体钢显微组织主要为纳米级板条贝氏体+少量马氏体+残余奥氏体。纳米级板条贝氏体组织既具有较高的强度,又有良好的塑性,对提升板材的性能有利。而且大量Si元素的加入抑制碳化物的形成,使延伸性能进一步提高,冲击韧性大大增强。利用向低碳钢中添加适量Cr可以在等温处理过程中促进更多纳米级板条贝氏体的形成,最终得到屈服强度为896~958MPa、抗拉强度为1250~1350MPa和延伸率为13.1~15.3%的低碳高强度含Cr纳米级贝氏体钢。
本发明具有成本低廉、周期短和工艺简单的特点,所制备的低碳高强度含Cr纳米级贝氏体钢机械性能优良,广泛应用于工程机械、海洋设施、桥梁、汽车、造船、压力容器等领域。
具体实施方式
下面结合具体实施方式对本发明作进一步描述,并非对本发明保护范围的限制。
实施例1
一种低碳高强度含Cr纳米级贝氏体钢及其制备方法。将钢坯轧制成板材,将所述板材以5~8℃/s的升温速度加热至980~1000℃,保温10~15min,水冷至410~420℃,再空冷至340~350℃,保温10~15min,然后水冷至室温,制得低碳高强度含Cr纳米级贝氏体钢。
所述钢坯的化学成分及其含量是:C为0.23~0.24wt%,Si为1.70~1.83wt%,Mn为1.98~2.00wt%,Mo为0.227~0.229wt%,Cr为0.98~1.00wt%,P<0.008wt%,S<0.002 wt%,N<0.004wt%,其余为Fe及不可避免的杂质。
本实施例所制备的低碳高强度含Cr纳米级贝氏体钢经检测:屈服强度为920~958MPa;抗拉强度为1300~1350MPa;延伸率为13.1~14.4%。
实施例2
一种低碳高强度含Cr纳米级贝氏体钢及其制备方法。将钢坯轧制成板材,将所述板材以7~10℃/s的升温速度加热至1000~1020℃,保温15~20min,水冷至420~430℃,再空冷至350~360℃,保温15~20min,然后水冷至室温,制得低碳高强度含Cr纳米级贝氏体钢。
所述钢坯的化学成分及其含量是:C为0.24~0.25wt%,Si为1.80~1.93wt%,Mn为1.99~2.02wt%,Mo为0.228~0.230wt%,Cr为0.99~1.02wt%,P<0.008wt%,S<0.002 wt%,N<0.004wt%,其余为Fe及不可避免的杂质。
本实施例所制备的低碳高强度含Cr纳米级贝氏体钢经检测:屈服强度为896~924MPa;抗拉强度为1250~1300MPa;延伸率为14.2~15.3%。
本具体实施方式与现有技术相比具有如下积极效果:
本具体实施方式以价格低廉的C、Si、Mn元素为主,不需要添加Nb、Ti、Ni、B等贵重合金元素,故成本低廉;本具体实施方式向低碳钢中添加适量Cr提高钢的淬透性,避免高温铁素体的转变,促进更多过冷奥氏体向贝氏体转变;控制贝氏体转变在低温下进行,短周期内获得几乎全部的纳米级板条贝氏体组织,提高制品的强度及韧性。
本具体实施方式制备的低碳高强度含Cr纳米级贝氏体钢显微组织主要为纳米级板条贝氏体+少量马氏体+残余奥氏体。纳米级板条贝氏体组织既具有较高的强度,又有良好的塑性,对提升板材的性能有利。而且大量Si元素的加入抑制碳化物的形成,使延伸性能进一步提高,冲击韧性大大增强。利用向低碳钢中添加适量Cr可以在等温处理过程中促进更多纳米级板条贝氏体的形成,最终得到屈服强度为896~958MPa、抗拉强度为1250~1350MPa和延伸率为13.1~15.3%的低碳高强度含Cr纳米级贝氏体钢。
本具体实施方式具有成本低廉、周期短和工艺简单的特点,所制备的低碳高强度含Cr纳米级贝氏体钢机械性能优良,广泛应用于工程机械、海洋设施、桥梁、汽车、造船、压力容器等领域。
Claims (2)
1.一种低碳高强度含Cr纳米级贝氏体钢的制备方法,其特征在于将钢坯轧制成板材,将所述板材以5~10℃/s的升温速度加热至980~1020℃,保温10~20min,水冷至410~430℃,再空冷至340~360℃,保温10~20min,然后水冷至室温,制得低碳高强度含Cr纳米级贝氏体钢;
所述钢坯的化学成分及其含量是:C为0.23~0.25wt%,Si为1.70~1.93wt%,Mn为1.98~2.02wt%,Mo为0.227~0.230wt%,Cr为0.98~1.02wt%,P<0.008wt%,S<0.002 wt%,N<0.004wt%,其余为Fe及不可避免的杂质。
2.一种低碳高强度含Cr纳米级贝氏体钢,其特征在于所述低碳高强度含Cr纳米级贝氏体钢为根据权利要求1所述低碳高强度含Cr纳米级贝氏体钢的制备方法所制备的低碳高强度含Cr纳米级贝氏体钢。
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