CN114438406A - 酸性环境用机械复合管无缝母管 - Google Patents
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Abstract
本发明涉及酸性环境用机械复合管无缝母管,母管包括如下重量百分比的各组分:0.06%≤C≤0.12%;0.10%≤Si≤0.30%;1.00%≤Mn≤1.60%;0.02%≤Nb≤0.10%;0.04%≤V≤0.10%;Ni+Mo≤0.20%;Cr+Cu≤0.20%;其他元素和余量Fe;本发明的酸性环境用机械复合管线管母管,能够达到高尺寸精度(管端内径±1mm,椭圆度≤3mm,管与管直径差≤1.6mm),高性能稳定性(强度波动范围为≤80MPa),高韧性(韧脆转变温度≤‑60℃),高延展性(延伸率≥30%(板)),高抗SSC腐蚀性(90%AYS四点弯曲720小时不断裂)。
Description
技术领域
本发明属于油气输送管材技术领域,尤其涉及酸性环境用机械复合管无缝母管。
背景技术
随着石油天然气开采和运输条件的不断恶劣,开采及输送的油气体也越复杂,对于复合管的需求日益增加。复合管即母材为碳钢管,复合层为316L不锈钢或者双相不锈钢或者镍基合金,母管保证基本强度,复合层保证足够的腐蚀余量,从而达到恶劣环境下输送环境的使用要求。复合管无缝母管相比普通管线管具有特殊性,对于母管的成分稳定、性能波动(最大屈服强度与最小屈服强度之差)和尺寸波动(壁厚不均度,管与管直径差)要求都比普通管线管要求高,需要保证复合后每个钢管的性能变化都符合要求,均一稳定的成分保证复合后管与管性能差别小。母管对整管外径、壁厚、椭圆度要求更高,尤其是管端尺寸,需要保证管端高尺寸精度满足后续堆焊的控制和焊接对接尺寸的控制。普通管线母管存在性能强度范围为150MPa,海洋用管强度范围为120MPa,管端尺寸精度不能满足焊接后对接余高差0.5mm等。
诸如中国专利公开号CN101417296A“直径为Φ219.0~460mm的大口径高钢级耐腐蚀无缝管的制造方法”、CN101287853A“管线用无缝钢管及其制造方法”等均为普通酸性用管线管,未有成分波动(ΔC、ΔSi、ΔMn、ΔNb、ΔV、ΔMo、ΔCr、ΔNi、ΔCu等)、性能波动(最大屈服强度与最小屈服强度之差)和尺寸波动(壁厚不均度,管与管直径差)等复合管母管指标的要求。
发明内容
为解决上述技术中存在的问题,本发明的目的是提供一种酸性环境用机械复合管母管,以满足深海等苛刻环境开发所需要的机械复合管母管,解决管线管在机械复合的情况下,性能不稳,尺寸不合而不能满足设计要求的问题。
本发明解决其技术问题是采取以下技术方案实现的:
酸性环境用机械复合管无缝母管,所述母管包括如下重量百分比的各组分:
0.06%≤C≤0.12%;
0.10%≤Si≤0.30%;
1.00%≤Mn≤1.60%;
0.02%≤Nb≤0.10%;
0.04%≤V≤0.10%;
Ni+Mo≤0.20%;
Cr+Cu≤0.20%;
其他元素和余量Fe。
进一步的,所述母管中组分的波动范围为:ΔC≤0.03%、ΔSi≤0.15%、ΔMn≤0.40%、ΔNb≤0.020%、ΔV≤0.030%、ΔMo≤0.05%、ΔCr≤0.05%、ΔNi≤0.10%、ΔCu≤0.10%。
进一步的,所述母管的壁厚不均度≤20%,管端内径公差≤±1mm,不圆度≤3mm,任意两支钢管管端外径直径差≤1.6mm。
进一步的,所述母管的性能满足屈服强度≥450MPa、抗拉强度≥535MPa、断后延伸率≥22%、最大总延伸率≥8%、屈强比≤0.90、韧脆转变温度≤-60℃、强度波动≤80MPa。
进一步的,所述其他元素包括Al、B、P、S。
进一步的,所述其他元素中组分的重量百分比满足:Al≤0.050%;B≤0.0005%、P≤0.020%、S≤0.008%。
本发明在成分设计上主要考虑成分控制范围,即元素波动范围的控制,利用低碳V+Nb微合金及织构的控制保证基本的强度范围。在轧制工艺上,利用高精度连轧机组通过优化孔型匹配轧制工具保证外径、壁厚不均度和内外表面质量,实现钢管尺寸精度和表面质量的吻合性。在热处理工艺上,通过淬火加回火,长材热处理工艺优化,保证温度控制精度、淬透性的充分以及组织转变的稳定性实现热处理后材料尺寸精度和性能稳定性。
本发明的优点和积极效果是:
本发明的酸性环境用机械复合管线管母管,能够达到高尺寸精度(管端内径±1mm,椭圆度≤3mm,管与管直径差≤1.6mm),高性能稳定性(强度波动范围为≤80MPa),高韧性(韧脆转变温度≤-60℃),高延展性(延伸率≥30%(板)),高抗SSC腐蚀性(90%AYS四点弯曲720小时不断裂)。
附图说明
以下将结合附图和实施例来对本发明的技术方案作进一步的详细描述,但是应当知道,这些附图仅是为解释目的而设计的,因此不作为本发明范围的限定。此外,除非特别指出,这些附图仅意在概念性地说明此处描述的结构构造,而不必要依比例进行绘制。
图1是本发明实施例提供的酸性环境用机械复合管无缝母管整个圆周360°性能波动;
图2本发明实施例提供的酸性环境用机械复合管无缝母管组织放大500X后的照片。
具体实施方式
首先,需要说明的是,以下将以示例方式来具体说明本发明的具体结构、特点和优点等,然而所有的描述仅是用来进行说明的,而不应将其理解为对本发明形成任何限制。此外,在本文所提及各实施例中予以描述或隐含的任意单个技术特征,或者被显示或隐含在各附图中的任意单个技术特征,仍然可在这些技术特征(或其等同物)之间继续进行任意组合或删减,从而获得可能未在本文中直接提及的本发明的更多其他实施例。另外,为了简化图面起见,相同或相类似的技术特征在同一附图中可能仅在一处进行标示。
在本发明的描述中,需要说明的是,术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系,或者是该发明产品使用时惯常摆放的方位或位置关系,仅是为了便于描述本发明和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本发明的限制。
需要说明的是,在不冲突的情况下,本申请中的实施例及实施例中的特征可以相互组合。
本实施例提供的酸性环境用机械复合管无缝母管,所述母管包括如下重量百分比的各组分:
0.06%≤C≤0.12%;
0.10%≤Si≤0.30%;
1.00%≤Mn≤1.60%;
0.02%≤Nb≤0.10%;
0.04%≤V≤0.10%;
Ni+Mo≤0.20%;
Cr+Cu≤0.20%;
其他元素和余量Fe。
其中,所述其他元素包括Al、B、P、S;所述其他元素中组分的重量百分比满足:Al≤0.050%;B≤0.0005%、P≤0.020%、S≤0.008%。
需要说明的是,CEpcm≤0.21%;
其中,CEPcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B,该式中各种元素代表该元素的质量百分比。
具体的,母管中的化学成分说明如下:
C:强度元素,考虑焊接性能和冶炼成本以及碳含量对性能和碳当量的影响,所以将其含量限制在0.06~0.12%范围内,波动范围控制在ΔC≤0.03%;
Si:强度元素,考虑韧性和耐蚀性以及对性能和碳当量的影响,所以将其含量限制在0.10~0.30%范围内,波动范围控制在ΔSi≤0.15%;
Mn:强度元素,考虑强度和低温韧性以及对性能和碳当量的影响,所以将其含量限制在1.00~1.60%范围内,波动范围控制在ΔMn≤0.40%;
Nb:微合金化元素,细化晶粒,提高抗腐蚀性能。所以将其含量限制在0.020~0.100%范围内,波动范围控制在ΔNb≤0.020%;
V:微合金元素,析出强化来提高钢的强度以及对性能和碳当量的影响,控制V含量在0.040~0.100%范围内,波动范围控制在ΔV≤0.030%;
Cr、Mo、Ni、Cu:残余元素,参与碳当量计算,控制Ni+Mo≤0.20%、Cr+Cu≤0.20%;,波动范围控制在ΔMo≤0.05%,ΔCr≤0.05%,ΔNi≤0.10%,ΔCu≤0.10%;
Al:Al是脱氧元素,其含量不能过高,易导致氧化物夹杂,所以将其含量限制在Al≤0.050%范围内;
B:残余元素,考虑钢的表面质量和焊接性能,控制其含量在≤0.0005%范围内;
P、S:P和S是杂质元素,炼钢过程中尽量降低其含量,杂质元素含量控制在P≤0.020%、S≤0.008%。
所述母管的壁厚不均度≤20%,椭圆度≤1%D,管端内径公差≤±1mm,不圆度≤3mm,任意两支钢管管端外径直径差≤1.6mm;是通过PQF和MPM高精度轧制和控制轧制工艺实现的,管端尺寸可以通过直接轧制或者定径工艺实现。
所述母管的性能满足屈服强度≥450MPa、抗拉强度≥535MPa、断后延伸率≥22%、最大总延伸率≥8%、屈强比≤0.90、韧脆转变温度≤-60℃、强度波动≤80MPa;是通过热处理工序实现,热处理工序采用高温淬火和高温回火工艺,淬火冷却介质采用水淬,高温回火冷却方式采用空冷。
作为举例,在本实施例中,制备若干DNVGL SMLS 450SFPDU钢级、规格219.1mm×12.7mm的酸性环境用机械复合管无缝母管,其化学成分如下表1、2;管材的尺寸精度见表3,此实施例的管端是直接通过轧制得到的,不需要额外的加工处理;力学性稳定性能见表4;韧脆性转变系列值见表5,转变温度≤-60℃。
表1管线管的化学成分
注:Ni、Cr、Mo、Cu为电炉冶炼残余,非故意添加元素;
需要说明的是,管线管的化学成分中还有其他的杂质元素,如表2所示:
表2
Ca | Pb | Sn | As | Sb | Bi | O | N | H |
0.0010 | 0.0001 | 0.0048 | 0.0056 | 0.0021 | 0.0005 | 0.0018 | 0.0050 | 0.00002 |
表3管线管的尺寸公差情况
注:管与管直径差是根据实测钢管管端外径,对比任意两支钢管管端外径得到直径差。
表4管线管的力学性能
注:试样类型为板状试样,bo为试样宽度,Lo为试样标距为50mm;Rt0.5:规定总延伸强度;Rm:抗
拉强度;A:断后伸长率;Agt:最大力总延伸率;Ag:最大力塑性延伸率;Y/T:屈强比。
表5管线管的韧脆性转变系列值
注:K为吸收能量,V为缺口形状,8为摆锤刀刃半径;T:横向;AK:冲击值;SFA:剪切面积百分比(纤维断面率)。
需要说明的是,图1是本发明实施例提供的酸性环境用机械复合管无缝母管整个圆周360°性能波动,是沿着钢管周向方向从1号顺时针挨着取样,试样宽度70mm,总计取8个试样,进行拉伸试验,得到每个试样的拉伸性能;拉伸性能数据大小变化不大,说明性能均匀稳定;图2本发明实施例提供的酸性环境用机械复合管无缝母管组织照片500X,就是热处理之后区金相试样,进行的组织分析,在放大倍数500X下进行的拍照,从图中可以看出,组织均匀,晶粒细小,说明组织比较好。
以上实施例对本发明进行了详细说明,但所述内容仅为本发明的较佳实施例,不能被认为用于限定本发明的实施范围。凡依本发明申请范围所作的均等变化与改进等,均应仍归属于本发明的专利涵盖范围之内。
Claims (6)
1.酸性环境用机械复合管无缝母管,其特征在于,所述母管包括如下重量百分比的各组分:
0.06%≤C≤0.12%;
0.10%≤Si≤0.30%;
1.00%≤Mn≤1.60%;
0.02%≤Nb≤0.10%;
0.04%≤V≤0.10%;
Ni+Mo≤0.20%;
Cr+Cu≤0.20%;
其他元素和余量Fe。
2.根据权利要求1所述的酸性环境用机械复合管无缝母管,其特征在于:所述母管中组分的波动范围为:ΔC≤0.03%、ΔSi≤0.15%、ΔMn≤0.40%、ΔNb≤0.020%、ΔV≤0.030%、ΔMo≤0.05%、ΔCr≤0.05%、ΔNi≤0.10%、ΔCu≤0.10%。
3.根据权利要求1所述的酸性环境用机械复合管无缝母管,其特征在于:所述母管的壁厚不均度≤20%,管端内径公差≤±1mm,不圆度≤3mm,任意两支钢管管端外径直径差≤1.6mm。
4.根据权利要求1所述的酸性环境用机械复合管无缝母管,其特征在于:所述母管的性能满足屈服强度≥450MPa、抗拉强度≥535MPa、断后延伸率≥22%、最大总延伸率≥8%、屈强比≤0.90、韧脆转变温度≤-60℃、强度波动≤80MPa。
5.根据权利要求1所述的酸性环境用机械复合管无缝母管,其特征在于:所述其他元素包括Al、B、P、S。
6.根据权利要求5所述的酸性环境用机械复合管无缝母管,其特征在于:所述其他元素中组分的重量百分比满足:Al≤0.050%;B≤0.0005%、P≤0.020%、S≤0.008%。
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