CN114058978A - 具有低温韧性的x80管线钢 - Google Patents

具有低温韧性的x80管线钢 Download PDF

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CN114058978A
CN114058978A CN202111328598.3A CN202111328598A CN114058978A CN 114058978 A CN114058978 A CN 114058978A CN 202111328598 A CN202111328598 A CN 202111328598A CN 114058978 A CN114058978 A CN 114058978A
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pipeline steel
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CN114058978B (zh
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庞贵良
张伟卫
谢萍
王磊
高琦
尚臣
贾海东
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Pipe Network Group Xinjiang United Pipeline Co ltd
China Oil and Gas Pipeline Network Corp
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    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
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    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
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    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
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Abstract

本发明涉及管线钢技术领域,是一种具有低温韧性的X80管线钢,该具有低温韧性的X80管线钢,其化学成分包括C,Mn,S,P,Si,Nb,Ti,Mo,Cu,Ni,Cr,限制元素B,Ca,N,O,其余为铁和不可避免杂质,按照下述步骤得到:将管线钢连铸坯经过加热、粗轧、精轧、快速冷却和卷取后得到具有低温韧性的X80管线钢。本发明优化了管线钢的化学成分、结合了控轧和控冷工艺,充分发挥细晶强化的作用,大幅度的提高了X80管线钢的低温韧性,拓宽了X80管线钢的应用领域。

Description

具有低温韧性的X80管线钢
技术领域
本发明涉及管线钢技术领域,是一种具有低温韧性的X80管线钢。
背景技术
近年来能源结构的变化以及对能源需求的增长,极大地促进了长距离输送管线的发展。为提高输送效率,降低工程投资,长距离石油天然气输送管线用钢不断向高钢级、大口径方向发展。但是一些管线工程建设不得不穿过一些严寒地区,严酷的低温施工和服役条件增加了该地区服役管道低温脆性失效的风险。几年前西气东输轮南首站低温液气分离器脆性断裂,造成了严重后果;格拉成品油管道因冻胀和融沉造成多次“露管”现象和30余次泄漏事件,造成巨大经济损失。因此,低温环境用高钢级管线用钢亟待开发。
基于现有的成熟技术,从考虑输送管道的运营稳定性、安全性、高效性和经济性出发,应该发展一种低温环境下具有高韧性的管线钢。由于特宽厚钢板,受原始板坯厚度限制,轧制压缩比不足,最终钢板产品在冲击韧性,落锤DWTT(落锤撕裂试验)性能,强度性能匹配等方面存在困难,在此基础上保持钢管优良的低温韧性是个巨大的挑战。
发明内容
本发明提供了一种具有低温韧性的X80管线钢,克服了上述现有技术之不足,其能有效解决现有X80管线钢低温下韧性不足,不能满足低温管道的需求。
本发明的技术方案是通过以下措施来实现的:一种具有低温韧性的X80管线钢,化学成分按重量百分比计包括C为0.05%至0.07%,Mn为1.60%至1.85%,S为≤0.002%,P为≤0.01%,Si为0.1%至0.3%,Nb为0.04%至0.08%,Ti为0.01%至0.03%,Mo为0.20%至0.35%,Cu为0.10%至0.25%,Ni为0.30%至0.80%,Cr为0.15%至0.35%,B为≤0.0005%,Ca为≤0.009%,N为≤0.008%,O为≤0.005%,其余为铁和不可避免杂质。
下面是对上述发明技术方案的进一步优化或/和改进:
上述具有低温韧性的X80管线钢,按照下述步骤得到:将管线钢连铸坯经过加热、粗轧、精轧、快速冷却和卷取后得到具有低温韧性的X80管线钢。
上述管线钢连铸坯厚度为300mm至500mm,加热温度为1160℃至1200℃。
上述粗轧的道次变形率为15%至30%。
上述精轧总压下率不低于65%。
上述快速冷却是在冷却速度为15℃/s至30℃/s条件下,将钢板冷却至450℃至550℃。
上述具有低温韧性的X80管线钢的屈服强度不低于555MPa,抗拉强度不低于625MPa,-45℃时的夏比冲击功值不低于300J,DWTT剪切面积不低于85%。
现有X80管线钢的Ni含量一般在0.3%以下,最高不会超过0.5%,现有技术主要是在合金成分和生产工艺上进行微调,以满足管线钢的强韧性要求和可焊接性要求。现有技术虽然通过物理冶金的方式解决了普通管线钢的焊接性和强韧性问题,但在低温环境中韧性急剧恶化,不能完全满足低温管道的需要。
本发明通过适当提高Ni的含量,细化晶粒,促进并行过程中的交叉滑移,降低变形时位错塞积的效力;通过对管线钢连铸坯进行加热,控制原始奥氏体晶粒的尺寸,防止粗化;通过粗轧工艺,强化高温奥氏体再结晶区的变形,充分细化奥氏体晶粒;再利用加速冷却工艺,充分发挥水冷作用,细化相变组织,得到均匀细化的针状铁素体组织,改善管线钢的落锤性能和夏比冲击性能,进而提高其低温韧性。
本发明优化了管线钢的化学成分、结合了控轧和控冷工艺,充分发挥细晶强化的作用,大幅度的提高了X80管线钢的低温韧性,拓宽了X80管线钢的应用领域。本发明无需对现有冶金设备,轧钢设备和冷却设备进行更新,也不需新添加附加设备,可直接进行工业化生产。
具体实施方式
本发明不受下述实施例的限制,可根据本发明的技术方案与实际情况来确定具体的实施方式。本发明中所提到各种化学试剂和化学用品如无特殊说明,均为现有技术中公知公用的化学试剂和化学用品;本发明中的百分数如没有特殊说明,均为质量百分数。
下面结合实施例对本发明作进一步描述:
实施例1:该具有低温韧性的X80管线钢,化学成分按重量百分比计包括C为0.05%至0.07%,Mn为1.60%至1.85%,S为≤0.002%,P为≤0.01%,Si为0.1%至0.3%,Nb为0.04%至0.08%,Ti为0.01%至0.03%, Mo为0.20%至0.35%,Cu为0.10%至0.25%,Ni为0.30%至0.80%,Cr为0.15%至0.35%,B为≤0.0005%,Ca为≤0.009%,N为≤0.008%,O为≤0.005%,其余为铁和不可避免杂质。
下面是对上述发明技术方案的进一步优化或/和改进:
实施例2:作为上述实施例的优化,具有低温韧性的X80管线钢,按照下述步骤得到:将管线钢连铸坯经过加热、粗轧、精轧、快速冷却和卷取后得到具有低温韧性的X80管线钢。
实施例3:作为上述实施例的优化,管线钢连铸坯厚度为300mm至500mm,加热温度为1160℃至1200℃。
实施例4:作为上述实施例的优化,粗轧的道次变形率为15%至30%。在粗轧阶段加大道次变形率,保证道次变形率在15%至30%之间,使奥氏体晶粒更好地发生动态再结晶,细化奥氏体晶粒。
实施例5:作为上述实施例的优化,精轧总压下率不低于65%。进一步细化晶粒,提高韧性。
实施例6:作为上述实施例的优化,快速冷却是在冷却速度为15℃/s至30℃/s条件下,将钢板冷却至450℃至550℃。充分发挥水冷作用,细化相变组织,改善钢板落锤性能和夏比冲击性能。
实施例7:该具有低温韧性的X80管线钢,化学成分按重量百分比计包括C为0.07%,Mn为1.85%,S=0.002%,P=0.01%,Si为0.3%,Nb为0.08%,Ti为0.03%, Mo为0.35%,Cu为0.25%,Ni为0.80%,Cr为0.35%,B为≤0.0005%,Ca为≤0.009%,N为≤0.008%,O为≤0.005%,其余为铁和不可避免杂质,其按照下述步骤得到:将厚度为为500mm的管线钢连铸坯经过加热、粗轧、精轧、快速冷却和卷取后得到具有低温韧性的X80管线钢,其中,粗轧的道次变形率为30%,精轧总压下率为65%,快速冷却是在冷却速度为30℃/s条件下,将钢板冷却至550℃。
实施例8:该具有低温韧性的X80管线钢,化学成分按重量百分比计包括C为0.05%,Mn为1.60%,S=0.002%,P=0.01%,Si为0.1%,Nb为0.04%,Ti为0.01%, Mo为0.20%,Cu为0.10%,Ni为0.30%,Cr为0.15%,B为≤0.0005%,Ca为≤0.009%,N为≤0.008%,O为≤0.005%,其余为铁和不可避免杂质,其按照下述步骤得到:将厚度为为300mm的管线钢连铸坯经过加热、粗轧、精轧、快速冷却和卷取后得到具有低温韧性的X80管线钢,其中,粗轧的道次变形率为15%,精轧总压下率为65%,快速冷却是在冷却速度为15℃/s条件下,将钢板冷却至450℃。
实施例9:该具有低温韧性的X80管线钢,化学成分按重量百分比计包括C为0.06%,Mn为1.7%,S=0.002%,P=0.01%,Si为0.2%,Nb为0.06%,Ti为0.02%, Mo为0.3%,Cu为0.2%,Ni为0.5%,Cr为0.2%,B为≤0.0005%,Ca为≤0.009%,N为≤0.008%,O为≤0.005%,其余为铁和不可避免杂质,其按照下述步骤得到:将厚度为为400mm的管线钢连铸坯经过加热、粗轧、精轧、快速冷却和卷取后得到具有低温韧性的X80管线钢,其中,粗轧的道次变形率为20%,精轧总压下率不低于65%,快速冷却是在冷却速度为20℃/s条件下,将钢板冷却至500℃。
实施例10:将本发明实施例7至实施例9制备的具有低温韧性的X80管线钢进行力学性能的考察,力学性能参照Q/SY GD 0503.3-2016《中俄东线天然气管道工程技术规范第3部分:X80级直缝埋弧焊管用热轧钢板技术条件》和GB/T 9711-2017《石油天然气工业管线输送系统用钢管》中的检测方法进行检测。检测结果如表1所示,由表1可知,本发明实施例7至实施例9制备的具有低温韧性的X80管线钢的屈服强度不低于555MPa,抗拉强度不低于625MPa,在-45℃时的夏比冲击功值不低于300J,在-45℃时的DWTT剪切面积不低于85%;现有X80管线钢屈服强度不低于555MPa,抗拉强度不低于625MPa,在-20℃时的夏比冲击功值为245J,DWTT在-15℃时的剪切面积为85%。与现有X80管线钢相比,现有X80管线钢能在-15℃下具有较高的夏比冲击功值和DWTT剪切面积,而本发明能在-45℃更低的温度下仍具有较高的夏比冲击功值和DWTT剪切面积,表明本发明具有较好的低温韧性,且其屈服强度和抗拉强度指标与现有X80管线钢水平保持一致。
综上所述,本发明优化了管线钢的化学成分、结合了控轧和控冷工艺,充分发挥细晶强化的作用,大幅度的提高了现有X80管线钢的低温韧性,拓宽了X80管线钢的应用领域。
以上技术特征构成了本发明的实施例,其具有较强的适应性和实施效果,可根据实际需要增减非必要的技术特征,来满足不同情况的需求。
Figure 861935DEST_PATH_IMAGE002

Claims (9)

1.一种具有低温韧性的X80管线钢,其特征在于化学成分按重量百分比计包括C为0.05%至0.07%,Mn为1.60%至1.85%,S为≤0.002%,P为≤0.01%,Si为0.1%至0.3%,Nb为0.04%至0.08%,Ti为0.01%至0.03%,Mo为0.20%至0.35%,Cu为0.10%至0.25%,Ni为0.30%至0.80%,Cr为0.15%至0.35%,B为≤0.0005%,Ca为≤0.009%,N为≤0.008%,O为≤0.005%,其余为铁和不可避免杂质。
2.根据权利要求1所述的具有低温韧性的X80管线钢,其特征在于按照下述步骤得到:将管线钢连铸坯经过加热、粗轧、精轧、快速冷却和卷取后得到具有低温韧性的X80管线钢。
3.根据权利要求2所述的具有低温韧性的X80管线钢,其特征在于管线钢连铸坯厚度为300mm至500mm,加热温度为1160℃至1200℃。
4.根据权利要求2或3所述的具有低温韧性的X80管线钢,其特征在于粗轧的道次变形率为15%至30%。
5.根据权利要求2或3所述的具有低温韧性的X80管线钢,其特征在于精轧总压下率不低于65%;或/和,快速冷却是在冷却速度为15℃/s至30℃/s条件下,将钢板冷却至450℃至550℃。
6.根据权利要求4所述的具有低温韧性的X80管线钢,其特征在于精轧总压下率不低于65%;或/和,快速冷却是在冷却速度为15℃/s至30℃/s条件下,将钢板冷却至450℃至550℃。
7.根据权利要求2或3或6所述的具有低温韧性的X80管线钢,其特征在于屈服强度不低于555MPa,抗拉强度不低于625MPa,-45℃时的夏比冲击功值不低于300J,DWTT剪切面积不低于85%。
8.根据权利要求4所述的具有低温韧性的X80管线钢,其特征在于屈服强度不低于555MPa,抗拉强度不低于625MPa,-45℃时的夏比冲击功值不低于300J,DWTT剪切面积不低于85%。
9.根据权利要求5所述的具有低温韧性的X80管线钢,其特征在于屈服强度不低于555MPa,抗拉强度不低于625MPa,-45℃时的夏比冲击功值不低于300J,DWTT剪切面积不低于85%。
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