CN114855060A - 一种管线钢x80及其生产方法 - Google Patents
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Abstract
本发明公开了一种管线钢X80及其生产方法,工艺流程包括转炉冶炼、精炼、连铸、加热轧制、冷却、检查入库,其特征在于:钢的化学组成质量百分比为碳=0.035~0.045,硅=0.10~0.20,锰=1.63~1.68,磷≤0.012,硫≤0.0015,铌=0.052~0.056,钛=0.012~0.018,铝≤0.015,镍=0.10~0.13,铬=0.15~0.20,钼=0.10~0.12,铜=0.12~0.15,其余为Fe与不可避免的杂质。本发明方法生产的钢具有强度高、韧性好、优良的低温韧性、优良的加工性能及优良的焊接性能,钢的屈服强度550~650Mpa,抗拉强度≥625Mpa,屈强比≤0.85,低温冲击韧性‑40℃,Akv≥210J,止裂落锤温度-30℃,韧性面积≥88%。
Description
技术领域
本发明属于冶金技术领域,涉及一种具有良好低温韧性的管线钢X80及其生产方法。
背景技术
随着能源结构的变化以及对能源需求的增长,能源的开采也逐渐由内陆向海洋、极地延伸,这就极大地促进了长距离输送管线的发展。海洋、极地自然条件较为恶劣,洋流、冻土、地震、低温大大提升了材料被破坏的风险。为了提高输送效率,降低工程成本,促使长距离石油天然气输送管线用钢向高钢级、大直径、大壁厚、低温韧性方向发展,产生了对高强度低温韧性钢的需求。高强度低温韧性钢是一个高技术含量、高附加值的新钢种,它除有较高的屈服强度、抗拉强度外,还有良好的延伸性能、冷弯性能、焊接性能和低温止裂性能,主要应用在天然气与石油输送行业,以适应更为复杂的服役环境,有效抵抗滑坡、地震、断层、低温环境带来的材料的破坏,提高钢材使用寿命,增加工程安全系数,也节约资源。
发明内容
本发明旨在提供提供一种高强度低温韧性好的石油天然气管线用钢X80及其生产方法,具有强度高、韧性好、优良的低温韧性、优秀的加工性能及优良的焊接性能,钢的屈服强度550~650Mpa,抗拉强度≥625Mpa,屈强比≤0.85,板厚低温冲击韧性-40℃,Akv≥210J,止裂落锤温度-30℃,韧性面积≥88%。
本发明通过下述技术方案予以实现:
一种管线钢X80及其生产方法,工艺流程包括转炉冶炼、精炼、连铸、加热轧制、冷却、检查入库,钢的化学组成质量百分比为碳=0.035~0.045,硅=0.10~0.20,锰=1.63~1.68,磷≤0.012,硫≤0.0015,铌=0.052~0.056,钛=0.012~0.018,铝≤0.015,镍=0.10~0.13,铬=0.15~0.20,钼=0.10~0.12,铜=0.12~0.15,其余为Fe与不可避免的杂质;关键工艺步骤包括:
(1)转炉:转炉控制氧≥400ppm,碳氧积=0.0023%,采用滑板装置,炉后加入石灰与改质剂进行渣处理,无铝脱氧;炉后采用大氩气搅拌4~8min进行充分碳氧反应,终点碳含量≤0.035%;
(2)精炼:加入石灰与精炼渣料脱氧、硫,精炼渣碱度CaO/SiO2≤4.5~6.0,全程控制钢水中铝含量,减少Al2O3夹杂物的生成;控制钢水中夹杂物,真空在0.5tor的工作真空度条件下保持真空时间18分钟以上;对钢水进行脱氮、氢、氧处理,氧含量≤15ppm;
(3)连铸:全程低过热度保护浇铸,控制过热度8~12℃,二次冷却采用动态配比水的方法,动态轻压下技术减轻铸坯中心偏析与疏松,铸坯出二冷火焰切割后采用铸坯淬火装置激冷至≤600℃,铸坯下线进保温装置缓冷至≤350℃装炉轧制;
(4)轧制:加热温度1150~1180℃,加热时间280~320min,待温坯厚度>3h,开轧温度840~930℃,终轧温度770~810℃,采用在线淬火,开始冷却温度780~820℃,终冷温度240~320℃,冷却速率25~35℃/s。
本发明的原理:
关于步骤(1),利用大氧气射流搅拌熔池,造高碱度渣,使得出钢氧含量≥400ppm,碳氧积=0.0023%,P≤0.010%,采用滑板挡渣出钢,减少高氧化渣的混出,不脱氧合金化,保持钢水的高氧含量,炉后大氩气搅拌4~8min,使得碳氧反应进一步发生,生产成CO2排出,进一步降低钢水的碳含量,减少碳化物的析出,消除异常组织的产生,稳定控制碳含量≤0.035%,采用非铝元素脱氧合金化,减少夹杂物Al2O3的生成,为后续精炼创造条件。
关于步骤(2),采用石灰和精炼渣料脱氧、硫,造高碱度流动性渣,精炼渣碱度CaO/SiO2:4.5~6.0,全程控制钢水中铝含量,减少Al2O3夹杂物的产生,便于CaO-Al2O3向低熔点CaO-Al2O3 -MgO复合夹杂物转变,利于夹杂物上浮与排除,夹杂物稳定控制A类粗细/细系≤0.5级;B类粗系/细系≤1.0级;C类粗系/细系≤0.5级;D类粗系/细系≤1.0级。
关于步骤(3),连铸采用低过热度保护浇铸,全程保护浇铸可有效降低二次氧化物的生成,控制过热度8~12℃,连铸二冷动态配水技术,凝固末端三段动态轻压下技术,压下量7~9mm,减少中心桥琏的形成,减轻中心偏析与疏松,中心偏析≤0.5级;铸坯经火焰切割后铸坯淬火装置激冷至≤600℃,均匀铸坯组织,下线保护罩内冷却至≤350℃后装炉轧制,铸坯态组织进一步稳定,得到细等轴晶组织。
关于步骤(4),通过1150~1180℃低温加热的执行,初始奥氏体细小,配合大压下轧制,进一步破碎晶粒,超大的冷速得了表面大量针状铁素体中间部分贝氏体的混合组织。铁素体组织相互缠绕,大量位错的存在,阻止了断裂的延展,提高了材料的止裂性能。
本发明的优点:生产流程简单,合金成本低,微铝成分控制可以有效降低Al2O3夹杂物的产生,减少钢中大型夹杂物的量,提高钢材性能。独特的炉后脱碳技术,省去传统的RH脱碳工艺,减少了工序,省了生产成本,节约了能源,减少CO2排放,减轻了转炉的吹炼压力,保护了转炉炉衬,延长了转炉炉龄,通过炉后吹氩搅拌碳-氧反应的进一步发生,可以稳定控制碳元素0.035%~0.045%。连铸坯淬火激冷+保温罩的保温技术,使铸坯得到尽可能多的细小等轴晶组织。铁素体加贝氏体缠绕组织,得到了优良的低温止裂性能。该发明所生产的低温管线钢X80,铸坯偏析C≤1.0,钢板性能均匀稳定,具备优良的止裂性能,屈服强度550~630Mpa,抗拉强度650~730Mpa,屈强比≤0.88,-40℃冲击260~450J,-30落锤剪切面积≥88%;夹杂物A类粗系/细系≤0.5级,B类粗系/细系≤1.0级,C类粗系/细系≤0.5级,D类粗系/细系≤1.0级。
附图说明
图1为钢板金相组织图。
具体实施方式
下面结合实施例对本发明作进一步说明:
实施例1:18.4mmX80管线钢的生产
合金元素的化学成分重量百分比为碳=0.036,硅=0.18,锰=1.66,磷=0.012,硫≤0.0016,铌=0.056,钛=0.016,铝=0.008,镍=0.12,铬=0.16,钼=0.11,铜=0.14,余量为铁和不可避免的杂质,关键工艺步骤:
(1)转炉冶炼:转炉出钢氧含量430ppm,碳含量0.056%,炉后控制氩搅拌,氩气流量10L/min,碳氧反应进一步发生,出吹氩站碳0.032%;
(2)LF炉精炼:精炼温度为1500~1650℃;全程控制钢水中铝含量,减少Al2O3夹杂物的产生,便于CaO-Al2O3向低熔点CaO-Al2O3 -MgO复合夹杂物转变,利于夹杂物上浮与排除,A类粗细/细系0级;B类粗系/细系0.5级;C类粗系/细系0级;D类粗系/细系0.5级,在0.5tor的真空下,保持真空时间18分钟;对钢水进行脱氮、氢、氧处理,氧含量≤15ppm,大幅度提高钢水纯净度;
(3)连铸:控制过热度10℃,连铸二冷配水比水量0.18L/kg,凝固末端三段动态轻压下技术,压下量7mm,减少中心桥琏的形成,减轻中心偏析与疏松,中心偏析0.5级;铸坯经火焰切割后铸坯淬火装置激冷580℃,下线保护罩内冷却至330℃后装炉轧制,铸坯态组织进一步稳定,得到细等轴晶组织;
(4)轧制:加热温度1150~1180℃,加热时间290min,待温坯厚度70mm,开轧温度870℃,终轧温度770~810℃,采用在线淬火,开始冷却温度805℃,终冷温度240~320℃,冷却速率26.3℃/s。
表1 18.4mm低温韧性管线钢X80性能表
实施例2:32.1mmX80管线钢的生产
本发明包括合金元素、铁余量和不可避免的杂质,合金元素的化学成分重量百分比为:碳=0.036,硅=0.18,锰=1.66,磷=0.012,硫≤0.0016,铌=0.056,钛=0.016,铝=0.008,镍=0.12,铬=0.16,钼=0.11,铜=0.14。关键工艺步骤:
(1)转炉冶炼:转炉出钢氧含量430ppm,碳含量0.056%,炉后控制氩搅拌,氩气流量10L/min,碳氧反应进一步发生,出吹氩站碳0.032%;
(2)LF炉精炼:精炼温度为1500~1650℃;全程控制钢水中铝含量,减少Al2O3夹杂物的产生,便于CaO-Al2O3向低熔点CaO-Al2O3 -MgO复合夹杂物转变,利于夹杂物上浮与排除,A类粗细/细系0级;B类粗系/细系0.5级;C类粗系/细系0级;D类粗系/细系0.5级,在0.5tor的真空下,保持真空时间18分钟;对钢水进行脱氮、氢、氧处理,氧含量≤15ppm,大幅度提高钢水纯净度;
(3)连铸:控制过热度10℃,连铸二冷配水比水量0.18L/kg,凝固末端三段动态轻压下技术,压下量7mm,减少中心桥琏的形成,减轻中心偏析与疏松,中心偏析0.5级;铸坯经火焰切割后铸坯淬火装置激冷580℃,下线保护罩内冷却至330℃后装炉轧制,铸坯态组织进一步稳定,得到细等轴晶组织;
(4)轧制:加热温度1150~1180℃,加热时间290min,待温坯厚度90mm,开轧温度840℃,终轧温度770~810℃,采用在线淬火,开始冷却温度805℃,终冷温度240~320℃,冷却速度23.7℃/s。
表2 32.1mm低温韧性管线钢X80性能表
Claims (1)
1.一种管线钢X80的生产方法,工艺流程包括转炉冶炼、精炼、连铸、加热轧制、冷却、检查入库,其特征在于:钢的化学组成质量百分比为碳=0.035~0.045,硅=0.10~0.20,锰=1.63~1.68,磷≤0.012,硫≤0.0015,铌=0.052~0.056,钛=0.012~0.018,铝≤0.015,镍=0.10~0.13,铬=0.15~0.20,钼=0.10~0.12,铜=0.12~0.15,其余为Fe与不可避免的杂质;关键工艺步骤包括:
(1)转炉:转炉控制氧≥400ppm,碳氧积=0.0023%,采用滑板装置挡渣,炉后加入石灰与改质剂进行渣处理,无铝脱氧;炉后采用大氩气搅拌4~8min进行充分碳氧反应,终点碳含量≤0.035%;
(2)精炼:加入石灰与精炼渣料脱氧、硫,精炼渣碱度CaO/SiO2:4.5~6.0,全程控制钢水中铝含量,减少Al2O3夹杂物的生成;控制钢水中夹杂物,真空在0.5tor的工作真空度条件下保持真空时间18分钟以上;对钢水进行脱氮、氢、氧处理,氧含量≤15ppm;
(3)连铸:全程低过热度保护浇铸,控制过热度8~12℃,二次冷却采用动态配比水的方法,动态轻压下技术减轻铸坯中心偏析与疏松,铸坯出二冷火焰切割后采用铸坯淬火装置激冷至≤600℃,铸坯下线进保温装置缓冷至≤350℃装炉轧制;
(4)轧制:加热温度1150~1180℃,加热时间280~320min,待温坯厚度>3h,开轧温度840~930℃,终轧温度770~810℃,采用在线淬火,开始冷却温度780~820℃,终冷温度240~320℃,冷却速率25~35℃/s。
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