CN114182170A - 一种具有优异焊接性能的x80级热煨弯管及其制造方法 - Google Patents
一种具有优异焊接性能的x80级热煨弯管及其制造方法 Download PDFInfo
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Abstract
本发明公开了一种具有优异焊接性能的X80级热煨弯管及其制造方法,涉及钢铁生产技术领域,其化学成分及质量百分比如下:C:0.05%~0.08%,Si:0.10%~0.30%,Mn:1.50%~1.70%,P≤0.015%,S≤0.0030%,Nb:0.040%~0.060%,V:0.030%~0.050%,Ti:0.006%~0.020%,Cr:0.10%~0.30%,Ni:0.60%~0.80%,Mo:0.20%~0.30%,Cu:0.10%~0.30%,Al:0.005%~0.015%,Mg:0.0008%~0.0015%,B≤0.0005%,N≤0.0050%,不添加Ca,余量为Fe和不可避免的杂质。镁冶金技术的应用提高了产品的焊接后性能,因为镁元素的形核质点不同,焊机热影响区的晶粒得到了有效细化,焊接热影响区及焊接区域的性能得到了大幅度的提升。
Description
技术领域
本发明涉及钢铁生产技术领域,特别是涉及一种具有优异焊接性能的X80级热煨弯管及其制造方法。
背景技术
随着我国天然气工业的高速发展和石油、天然气等资源需求的日益增长,输送效率进一步提高,管道输送正向大口径、大壁厚和高压输送方向发展。中俄东线天然气管道工程,全长3371公里,是我国目前口径最大、压力最高的长距离天然气输送管道,干线线路管径1422mm,设计压力12MPa,设计输量380×108m3/a。中俄东线北段(黑河—长岭)的部分地段热煨弯管管道采用φ1422×33.8mm规格X80管线钢,强韧性要求高。长距离天然气管道建设采用高压、大直径、厚壁的方式,以降低天然气管道建设和运营成本、提高其输送效率,要求更为优良的低温冲击韧性(-45℃KV2≥200J)适用于更恶劣的服役环境。
厚壁大口径热煨弯管用X80管线钢研制的技术关键是如何同时保证产品的高强度和良好的低温韧性。中俄东线大口径厚壁低温热煨弯管(φ1422×(≥)30mm规格X80(适用温度-45℃))用板研制难度大,主要采用控轧控冷、低碳微合金技术。钢板制成管后性能会下降,为确保弯管最终的强度和低温韧性达到设计要求,需提高钢的“淬透性”,以保证得到强韧匹配优异的中低温转变组织。又由于X80管线钢宽厚板压缩比有限,如何优化关键合金成分和TMCP工艺,以获得数量较多、细化的大角度晶界及亚结构,从而调控优异的-45℃低温韧性的管线钢板,是目前要解决的难题。
发明内容
本发明针对上述技术问题,克服现有技术的缺点,提供一种具有优异焊接性能的X80级热煨弯管,其化学成分及质量百分比如下:C:0.05%~0.08%,Si:0.10%~0.30%,Mn:1.50%~1.70%,P≤0.015%,S≤0.0030%,Nb:0.040%~0.060%,V:0.030%~0.050%,Ti:0.006%~0.020%,Cr:0.10%~0.30%,Ni:0.60%~0.80%,Mo:0.20%~0.30%,Cu:0.10%~0.30%,Al:0.005%~0.015%,Mg:0.0008%~0.0015%,B≤0.0005%,N≤0.0050%,不添加Ca,余量为Fe和不可避免的杂质。
本发明进一步限定的技术方案是:
前所述的一种具有优异焊接性能的X80级热煨弯管,其化学成分及质量百分比如下:C:0.05%~0.07%,Si:0.10%~0.20%,Mn:1.50%~1.60%,P≤0.013%,S≤0.0020%,Nb:0.040%~0.050%,V:0.030%~0.040%,Ti:0.006%~0.018%,Cr:0.10%~0.20%,Ni:0.60%~0.70%,Mo:0.20%~0.25%,Cu:0.10%~0.20%,Al:0.005%~0.013%,Mg:0.0008%~0.0013%,B≤0.0005%,N≤0.0050%,不添加Ca,余量为Fe和不可避免的杂质。
前所述的一种具有优异焊接性能的X80级热煨弯管,其化学成分及质量百分比如下:C:0.06%~0.08%,Si:0.20%~0.30%,Mn:1.60%~1.70%,P≤0.014%,S≤0.0020%,Nb:0.050%~0.060%,V:0.040%~0.050%,Ti:0.008%~0.020%,Cr:0.20%~0.30%,Ni:0.70%~0.80%,Mo:0.25%~0.30%,Cu:0.20%~0.30%,Al:0.008%~0.015%,Mg:0.0010%~0.0015%,B≤0.0005%,N≤0.0050%,不添加Ca,余量为Fe和不可避免的杂质。
前所述的一种具有优异焊接性能的X80级热煨弯管,其化学成分及质量百分比如下:C:0.055%~0.075%,Si:0.15%~0.25%,Mn:1.55%~1.65%,P≤0.013%,S≤0.0020%,Nb:0.045%~0.055%,V:0.035%~0.045%,Ti:0.008%~0.018%,Cr:0.15%~0.25%,Ni:0.65%~0.75%,Mo:0.22%~0.28%,Cu:0.15%~0.25%,Al:0.008%~0.013%,Mg:0.0009%~0.0013%,B≤0.0005%,N≤0.0050%,不添加Ca,余量为Fe和不可避免的杂质。
本发明的另一目的在于提供一种具有优异焊接性能的X80级热煨弯管制造方法,包括以下步骤:
S1、采用碱性转炉冶炼,LF造渣脱硫并进行真空脱气处理,获得碳含量0.050%~0.070%,磷含量≤0.015%,硫含量≤0.0030%的纯净镇静钢;
S2、钢水通过RH真空处理后,喂入镁铝丝线200~300米;
S3、采用弧形连铸机浇铸,铸坯低倍B0.5级或更好;
S4、铸坯表检后经加热炉加热至1160~1180℃,终轧温度770~790℃,入水温度740~760℃,返红温度510~570℃。
6.根据权利要求1所述的一种具有优异焊接性能的X80级热煨弯管及其制造方法,其特征在于:所述步骤S2,保证连铸中包钢水镁含量Mg:0.0008%~0.0015%。
本发明的有益效果是:
(1)本发明通过研究高强厚板微结构形态与低温韧性之间的关系,分析数量多而细化的大角度晶界和细匀分布的M/A等复相组织微结构对低温韧性的调控机理,构建新的强韧化机理,从而解决综合力学性能调控的关键技术问题,突破厚壁大口径低温热煨弯管X80高强高韧的技术瓶颈,形成稳定批量生产的全流程生产技术,为实现工业规模生产及应用奠定基础;
(2)本发明采用镁微合金化技术,镁冶金技术比原有的钙处理技术,夹杂物尺寸得到了明显改善,由以前50μm纳米降低到小于10μm的纳米级微小夹杂物,镁合金化厚度纳米级微细化夹杂在焊接过程中成为了组织再次转变的形核质量,在冷却过程中形成了以针状铁素体为主的组织类型,有效提高钢水纯净度,有效提升了产品性能;
(3)本发明采用低碳和Nb+Cr+V+Ni+Mo合金体系成分设计,采用纯净钢冶炼技术,严格控制P、S、O、N、H等有害元素及气体含量和铸坯偏析程度,以及采用TMCP组织调控技术,开发生产出OD1422×35.2mm X80M感应加热弯管用热轧宽厚钢板;
(4)本发明成分及性能均满足技术要求,具有良好的强韧性匹配,组织类型为少量先共析铁素体+针状铁素体+贝氏体+马奥岛的软/硬相复合组织,晶粒度大于11级,满足产品的性能要求。
附图说明
图1为本发明实施例1的金相组织图。
具体实施方式
实施例1
本实施例提供的一种具有优异焊接性能的X80级热煨弯管,其化学成分及质量百分比如下:C:0.09%,Si:0.19%,Mn:1.58%,P:0.011%,S:0.0011%,Nb:0.046%,V:0.033%,Ti:0.011%,Cr:0.19%,Ni:0.66%,Mo:0.23%,Cu:0.18%,Al:0.010%,Mg:0.0009%,B:0.0003%,N:0.0033%,不添加Ca,余量为Fe和不可避免的杂质。
其制造方法包括以下步骤:
S1、采用碱性转炉冶炼,LF造渣脱硫并进行真空脱气处理获得碳含量0.073%、磷含量0.012%、硫含量0.0011%的纯净镇静钢;
S2、钢水通过RH真空处理后,喂入镁铝丝线260米,连铸中包钢水镁含量Mg:0.0013%;
S3、采用弧形连铸机浇铸,铸坯低倍B0.5级或更好;
S4、铸坯表检后经加热炉加热至1163℃,终轧温度786℃,入水温度751℃,返红温度560℃。
实施例2
本实施例提供的一种具有优异焊接性能的X80级热煨弯管及其制造方法,其化学成分及质量百分比如下:C:0.073%,Si:0.26%,Mn:1.69%,P:0.012%,S:0.0011%,Nb:0.059%,V:0.043%,Ti:0.0011%,Cr:0.27%,Ni:0.79%,Mo:0.29%,Cu:0.26%,Al:0.012%,Mg:0.0013%,B:0.0002%,N:0.0041%,不添加Ca,余量为Fe和不可避免的杂质。
其制造方法包括以下步骤:
S1、采用碱性转炉冶炼,LF造渣脱硫并进行真空脱气处理获得碳含量0.073%、磷含量0.012%、硫含量0.0011%的纯净镇静钢;
S2、钢水通过RH真空处理后,喂入镁铝丝线290米,连铸中包钢水镁含量Mg:0.0013%;
S3、采用弧形连铸机浇铸,铸坯低倍B0.5级或更好;
S4、铸坯表检后经加热炉加热至1178℃,终轧温度779℃,入水温度7443℃,返红温度512℃;
实施例3
本实施例提供的一种具有优异焊接性能的X80级热煨弯管及其制造方法,其化学成分及质量百分比如下:C:0.061%,Si:0.17%,Mn:1.59%,P:0.011%,S:0.0009%,Nb:0.049%,V:0.039%,Ti:0.017%,Cr:0.19%,Ni:0.69%,Mo:0.26%,Cu:0.17%,Al:0.009%,Mg:0.0012%,B:0.0004%,N:0.00:40%,不添加Ca,余量为Fe和不可避免的杂质。
其制造方法包括以下步骤:
S1、采用碱性转炉冶炼,LF造渣脱硫并进行真空脱气处理获得碳含量0.061%、磷含量0.011%、硫含量0.0009%的纯净镇静钢;
S2、钢水通过RH真空处理后,喂入镁铝丝线210米,连铸中包钢水镁含量Mg:0.0009%;
S3、采用弧形连铸机浇铸,铸坯低倍B0.5级或更好;
S4、铸坯表检后经加热炉加热至1167℃,终轧温度783℃,入水温度752℃,返红温度560℃。
综上所述,本发明采用了镁系合金化技术,减小了钢中硫的危害,有效球化了A类夹杂物,提高钢的内部质量。镁冶金技术的应用提高了产品的焊接后性能,因为镁元素的形核质点不同,焊机热影响区的晶粒得到了有效细化,焊接热影响区及焊接区域的性能得到了大幅度的提升。在重大管道工程中具有良好的应用前景,将为管道工程的发展提供关键材料及应用支撑,满足社会经济发展对能源产品的迫切需求,同时带动相关行业的技术进步和产业升级。
除上述实施例外,本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案,均落在本发明要求的保护范围。
Claims (6)
1.一种具有优异焊接性能的X80级热煨弯管,其特征在于:其化学成分及质量百分比如下:C:0.05%~0.08%,Si:0.10%~0.30%,Mn:1.50%~1.70%,P≤0.015%,S≤0.0030%,Nb:0.040%~0.060%,V:0.030%~0.050%,Ti:0.006%~0.020%,Cr:0.10%~0.30%,Ni:0.60%~0.80%,Mo:0.20%~0.30%,Cu:0.10%~0.30%,Al:0.005%~0.015%,Mg:0.0008%~0.0015%,B≤0.0005%,N≤0.0050%,不添加Ca,余量为Fe和不可避免的杂质。
2.根据权利要求1所述的一种具有优异焊接性能的X80级热煨弯管,其特征在于:其化学成分及质量百分比如下:C:0.05%~0.07%,Si:0.10%~0.20%,Mn:1.50%~1.60%,P≤0.013%,S≤0.0020%,Nb:0.040%~0.050%,V:0.030%~0.040%,Ti:0.006%~0.018%,Cr:0.10%~0.20%,Ni:0.60%~0.70%,Mo:0.20%~0.25%,Cu:0.10%~0.20%,Al:0.005%~0.013%,Mg:0.0008%~0.0013%,B≤0.0005%,N≤0.0050%,不添加Ca,余量为Fe和不可避免的杂质。
3.根据权利要求1所述的一种具有优异焊接性能的X80级热煨弯管,其特征在于:其化学成分及质量百分比如下:C:0.06%~0.08%,Si:0.20%~0.30%,Mn:1.60%~1.70%,P≤0.014%,S≤0.0020%,Nb:0.050%~0.060%,V:0.040%~0.050%,Ti:0.008%~0.020%,Cr:0.20%~0.30%,Ni:0.70%~0.80%,Mo:0.25%~0.30%,Cu:0.20%~0.30%,Al:0.008%~0.015%,Mg:0.0010%~0.0015%,B≤0.0005%,N≤0.0050%,不添加Ca,余量为Fe和不可避免的杂质。
4.根据权利要求1所述的一种具有优异焊接性能的X80级热煨弯管,其特征在于:其化学成分及质量百分比如下:C:0.055%~0.075%,Si:0.15%~0.25%,Mn:1.55%~1.65%,P≤0.013%,S≤0.0020%,Nb:0.045%~0.055%,V:0.035%~0.045%,Ti:0.008%~0.018%,Cr:0.15%~0.25%,Ni:0.65%~0.75%,Mo:0.22%~0.28%,Cu:0.15%~0.25%,Al:0.008%~0.013%,Mg:0.0009%~0.0013%,B≤0.0005%,N≤0.0050%,不添加Ca,余量为Fe和不可避免的杂质。
5.一种具有优异焊接性能的X80级热煨弯管制造方法,其特征在于:应用于权利要求1-4任意一项,包括以下步骤:
S1、采用碱性转炉冶炼,LF造渣脱硫并进行真空脱气处理,获得碳含量0.050%~0.070%,磷含量≤0.015%,硫含量≤0.0030%的纯净镇静钢;
S2、钢水通过RH真空处理后,喂入镁铝丝线200~300米;
S3、采用弧形连铸机浇铸,铸坯低倍B0.5级或更好;
S4、铸坯表检后经加热炉加热至1160~1180℃,终轧温度770~790℃,入水温度740~760℃,返红温度510~570℃。
6.根据权利要求1所述的一种具有优异焊接性能的X80级热煨弯管及其制造方法,其特征在于:所述步骤S2,保证连铸中包钢水镁含量Mg:0.0008%~0.0015%。
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