CN109234621A - 一种x70m深海抗应变管线钢板及轧制工艺 - Google Patents
一种x70m深海抗应变管线钢板及轧制工艺 Download PDFInfo
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Abstract
本发明公开了一种X70M深海抗应变管线钢板,涉及冶金领域,化学成分及质量百分比如下:C:0.030%~0.050%,Si:0.10%~0.35%,Mn:1.40%~1.60%,P:0.010%,S<0.0020%,Nb:0.030%~0.070%,Ti:0.006%~0.020%,Ni:0.42%~0.50%,Cr:0.02%,Mo:0.20%~0.30%,Cu:0.02%,V:0.02%,Al:0.015%~0.050%,Ca:0.0005%~0.030%,Ceq:0.42,Pcm:0.18,余量为Fe和杂质。本发明提供了具有连续屈服性能的管线钢板,满足深海抗震区域服役性能。
Description
技术领域
本发明涉及冶金技术领域,特别是涉及一种X70M深海抗应变管线钢板及轧制工艺。
背景技术
随着世界经济的飞速发展,石油天然气的需求日益增加,海洋海底蕴藏着大量的石油资源,石油开发后通过管道运输经济安全。随着我国经济的不断发展,钢铁冶炼技术不断提升,已经成功开发了1500米深海、极低冻土区域、抗重酸性条件等服役条件下的管线产品,经实践验证,服役的钢板性能稳定,因此,根据国家能源发展需求,开发深海抗震区域的管道运输产品成为下一个开发热点。
发明内容
为了解决以上技术问题,本发明提供一种X70M深海抗应变管线钢板,其化学成分及质量百分比如下:C:0.030%~0.050%,Si:0.10%~0.35%,Mn:1.40%~1.60%,P:0.010%,S<0.0020%,Nb:0.030%~0.070%,Ti:0.006%~0.020%,Ni:0.42%~0.50%,Cr:0.02%,Mo:0.20%~0.30%,Cu:0.02%,V:0.02%,Al:0.015%~0.050%,Ca:0.0005%~0.030%,Ceq:0.42,Pcm:0.18,余量为Fe和杂质。
技术效果:本发明采用超低碳、高镍的成分设计方案,提高了钢板的深海低温韧性性能,通过铌、钛的成分设计达到了细化组织晶粒度的目的,加入钼来提高钢板厚度方向的组织均匀性及钢板强度。
本发明进一步限定的技术方案是:
前所述的一种X70M深海抗应变管线钢板,其化学成分及质量百分比如下:C:0.031%,Si:0.13%,Mn:1.45%,P:0.008%,S:0.0013%,Nb:0.068%,Ti:0.014%,Ni:0.43%,Cr:0.02%,Mo:0.23%,Cu:0.02%,V:0.02%,Alt:0.034%,Ca:0.0019%,Ceq:0.39,Pcm:0.18,余量为Fe和杂质。
前所述的一种X70M深海抗应变管线钢板,其化学成分及质量百分比如下:C:0.048%,Si:0.33%,Mn:1.55%,P:0.009%,S:0.0019%,Nb:0.036%,Ti:0.016%,Ni:0.48%,Cr:0.02%,Mo:0.28%,Cu:0.02%,V:0.02%,Alt:0.034%,Ca:0.0021%,Ceq:0.41,Pcm:0.18,余量为Fe和杂质。
前所述的一种X70M深海抗应变管线钢板,钢板的厚度为20mm~40mm。
本发明的另一目的在于提供一种X70M深海抗应变管线钢板的轧制工艺,奥氏体温度1120℃~1130℃,二开温度760℃~790℃,终轧温度为750℃~780℃,入水温度为710℃~720℃,采用超快冷冷却至260℃~300℃,辊速设定为1.0m/s~1.4m/s,加速度为0.008m/s2~0.013m/s2。
前所述的一种X70M深海抗应变管线钢板的轧制工艺,奥氏体温度1123℃,二开温度781℃,终轧温度为760℃,入水温度为719℃,采用超快冷冷却至288℃,辊速设定为1.3m/s,加速度为0.010m/s2。
前所述的一种X70M深海抗应变管线钢板的轧制工艺,奥氏体温度1128℃,二开温度768℃,终轧温度为779℃,入水温度为712℃,采用超快冷冷却至299℃,辊速设定为1.1m/s,加速度为0.010m/s2。
本发明的有益效果是:
(1)本发明考虑深海管线钢服役环境恶劣,受海水压力、洋流、地震等自然灾害影响,将壁厚控制在20mm~40mm;
(2)本发明的轧制工艺采用低温奥氏体化有效细化组织晶粒度,通过TMCP轧制工艺、轧后快冷技术得到了以均匀细小准多边形铁素体为主(含量60%~70%),并含有少量贝氏体、马奥岛的混合组织,此种组织具有良好的塑性,能有效抵制火山喷发、地震、海啸等带来的地质灾害,此外,该组织的横纵向韧性良好,满足深海服役的要求。
附图说明
图1为实施例1得到的钢板在金相显微镜下典型的组织形貌图;
图2为实施例2得到的钢板在金相显微镜下典型的组织形貌图;
图3为实施例1得到的钢板拉伸曲线的取值形貌图;
图4为实施例2得到的钢板拉伸曲线的取值形貌图。
具体实施方式
实施例1
本实施例提供的一种X70M深海抗应变管线钢板,钢板的厚度为20mm~40mm,其化学成分及质量百分比如下:C:0.031%,Si:0.13%,Mn:1.45%,P:0.008%,S:0.0013%,Nb:0.068%,Ti:0.014%,Ni:0.43%,Cr:0.02%,Mo:0.23%,Cu:0.02%,V:0.02%,Alt:0.034%,Ca:0.0019%,Ceq:0.39,Pcm:0.18,余量为Fe和杂质。
轧制工艺:奥氏体温度1123℃,二开温度781℃,终轧温度为760℃,入水温度为719℃,采用超快冷冷却至288℃,辊速设定为1.3m/s,加速度为0.010m/s2。
实施例2
本实施例提供的一种X70M深海抗应变管线钢板,钢板的厚度为20mm~40mm,其化学成分及质量百分比如下:C:0.048%,Si:0.33%,Mn:1.55%,P:0.009%,S:0.0019%,Nb:0.036%,Ti:0.016%,Ni:0.48%,Cr:0.02%,Mo:0.28%,Cu:0.02%,V:0.02%,Alt:0.034%,Ca:0.0021%,Ceq:0.41,Pcm:0.18,余量为Fe和杂质。
轧制工艺:奥氏体温度1128℃,二开温度768℃,终轧温度为779℃,入水温度为712℃,采用超快冷冷却至299℃,辊速设定为1.1m/s,加速度为0.010m/s2。
观察实施例1与实施例2得到的钢板在金相显微镜下典型的组织形貌图及拉伸性能拉伸曲线图。由图1、图2可见,钢板的组织为以均匀细小准多边形铁素体为主(含量60%~70%),并含有少量贝氏体、马奥岛的混合组织,该组织均匀细小且致密,有利于提高管线钢板在深海恶劣环境下的服役性能。
实施例1与实施例2所得钢板的力学性能测试结果如下:
由上表可知,钢板的成分、性能符合API 5L相关要求,满足客户的使用需求,达到了设计要求。
综上,本发明对管线钢深海及抗震服役条件进行了深入分析,采用独特的低碳、高镍成分设计,并通过适合该材质要求的超低温加热工艺、TMCP轧制工艺及轧后快冷技术,得到了以均匀细小准多边形铁素体为主(含量60%~70%),并有少量贝氏体及马奥岛的混合组织,这种组织晶粒间结合紧密,强度、韧性优异,具有突出的深海抗震区域服役性能,满足了客户在深海2000米以内的管道输送要求。
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 (7)
1.一种X70M深海抗应变管线钢板,其特征在于,其化学成分及质量百分比如下:C:0.030%~0.050%,Si:0.10%~0.35%,Mn:1.40%~1.60%,P:0.010%,S<0.0020%,Nb:0.030%~0.070%,Ti:0.006%~0.020%,Ni:0.42%~0.50%,Cr:0.02%,Mo:0.20%~0.30%,Cu:0.02%,V:0.02%,Al:0.015%~0.050%,Ca:0.0005%~0.030%,Ceq:0.42,Pcm:0.18,余量为Fe和杂质。
2.根据权利要求1所述的一种X70M深海抗应变管线钢板,其特征在于,其化学成分及质量百分比如下:C:0.031%,Si:0.13%,Mn:1.45%,P:0.008%,S:0.0013%,Nb:0.068%,Ti:0.014%,Ni:0.43%,Cr:0.02%,Mo:0.23%,Cu:0.02%,V:0.02%,Alt:0.034%,Ca:0.0019%,Ceq:0.39,Pcm:0.18,余量为Fe和杂质。
3.根据权利要求1所述的一种X70M深海抗应变管线钢板,其特征在于,其化学成分及质量百分比如下:C:0.048%,Si:0.33%,Mn:1.55%,P:0.009%,S:0.0019%,Nb:0.036%,Ti:0.016%,Ni:0.48%,Cr:0.02%,Mo:0.28%,Cu:0.02%,V:0.02%,Alt:0.034%,Ca:0.0021%,Ceq:0.41,Pcm:0.18,余量为Fe和杂质。
4.根据权利要求1所述的一种X70M深海抗应变管线钢板,其特征在于:钢板的厚度为20mm~40mm。
5.一种X70M深海抗应变管线钢板的轧制工艺,其特征在于:奥氏体温度1120℃~1130℃,二开温度760℃~790℃,终轧温度为750℃~780℃,入水温度为710℃~720℃,采用超快冷冷却至260℃~300℃,辊速设定为1.0m/s~1.4m/s,加速度为0.008m/s2~0.013m/s2。
6.根据权利要求5所述的一种X70M深海抗应变管线钢板的轧制工艺,其特征在于:奥氏体温度1123℃,二开温度781℃,终轧温度为760℃,入水温度为719℃,采用超快冷冷却至288℃,辊速设定为1.3m/s,加速度为0.010m/s2。
7.根据权利要求5所述的一种X70M深海抗应变管线钢板的轧制工艺,其特征在于:奥氏体温度1128℃,二开温度768℃,终轧温度为779℃,入水温度为712℃,采用超快冷冷却至299℃,辊速设定为1.1m/s,加速度为0.010m/s2。
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