管道工程用X70钢热煨弯管开裂分析.pdf

失效分析
管道工程用X70钢热煨弯管开裂分析
ホャす?で刘迎来,李为卫(中油管材研究所揄送管与安全评价中心,映西西安71005)
摘要:用化学分析、力学性能测试、宏观微观组织分析、扫描电镜(SEM)等方法对管道工程用d813mmx11mm
X70钢热煨弯管的开裂原因进行了分析。结果表明,弯管母管局部存在的夹渣是造成弯管开裂的主要原因,而弯
管热煨温度偏高,造成外弧侧材料产生过热,管体材料冲击韧性降低,加速了外弧侧管体裂纹失稳扩展。并提出
了相应的改进措施。
关键词:热煨弯管;开裂;夹渣;过热;失稳扩展
中图分类号:TG157;TG162.79文献标识码:B文章编号:02546051(2008)04008-05
Cracking analysis of X70 steel induction heat bend pipe used for
pipeline engineering
LIU Ying-lai, LI Wei-wei(The Tubular Goods Research Center of CNPC, Xi'an Shaanxi 710065, China)
Abstract: The cracking causes of pipeline project with 813 mm x 11 mm X70 steel induction heat bend were analyzed
by chemical analysis, mechanical properties test, macro-microstructure analysis and scanning electron microscopy
SEM). The results show that local slag of the parent pipe is the main cause of the bend cracking. The heating tempera-
ture of the bend production process is too high, resulting in overheating of the material outer are, and the material tough-
ness reduces which speeding up instability of crack extension of the material outer are. The improvement measures were
also
put forward
Key words: induction heat bend; crack; slag; superheat instability expansion
某天然气输送管道工程用813mmx11mmX70側取带有裂纹的弯管试样各1块,从对应弯管直管段
钢热煨弯管生产过程中,在喷砂工序段先后发现编号上取管体母材试样各1块,并将所取的4块样品委托
为35、397及312号共3根弯管外弧侧管体局部存在中油管材研究所就开裂原因进行分析。
多条横向裂纹。用户分别从35号和397号弯管外弧1试验材料
感应加热弯管母管选用d813mm×11mmX70直
作者简介:刘迎来(1964-),男,陕西岐山人,高级工程师,主要
缝埋弧焊管,直缝埋弧焊管选用X70钢板。弯管的生
从事输送管道工程用高强度弯管及管件的研制开发、失效分
析、技术支持及重要输送管线现场事故的处理等,发表论文26产工艺流程为:原材料入厂检验一投料一热煨制一回
篇。联系电话。0989515,传真:02998005Ea:.i火ー喷砂一检测。工艺参数:感应加热弯管热煨制过
( tgrc otg
程中,管体加热温度控制范围940~1020℃,测温工具
收稿日期:2007-12-14
为手持式红外测温仪,冷却介质为清水,弯管推进送料
17 Dom Nguez-aguilar M A, Newman R C. Detection of delete 1 upon J N. Micrstucural development and solidification
rious phases in duplex stainless steel by weak galvanostatic
cracking susceptibility of a stabilized Stainless steel[J
polarization in halide solutions [J]. Corro. Sci., 2006, 48(
Weld.J.,1990,78(7):253-26
9):2577-2591,
22]霍立兴.焊接结构的断裂行为及评定[M].北京:机械工
[18] Nicoletti E S, Darwish F A and Sol Rzano G. On the devel
业出版社,2000:358-363
opment of nano and microscale precipitates upon isothermal [23 Colet J L, Thevenot N, Nesic S. Role of conductive cor-
aging of nickel base superalloy 59 J]. Mater. Sci. Enginee.
sion products in the protectiveness of corrosion layers[ MI
B,2004,112(2):214-222
Houston. NACE 1996: 4
19]薛文娬,华铭,施修龄,等.LC4超硬锆合金微弧氧化[24] Lo pez D A, PE rez T, Simison S N. The influence of micro
膜电化学腐蚀特性[J].材料热处理学报,2007,28(3)
structure and chemical composition of carbon and low allo
l11-115.
steels in CO, corrosion. A state-of-the-art appraisal[ J]. Ma-
[20] Dupont J N, Banovic W, Marder A R Microstructural evolu-
ter.Sci. Technol.,2003,24(8):561-575
tion and weldability of dissimilar welds between a super [25] Nesic S, Lunde L. Carbon dioxide corrosion of caron ste
austenitic stainless steel and nickel-based alloy[J]. Weld.
in two-phase flow[ J]. Corr, 1994, 50(9): 717-727
J.,2003,82(6):125-13
88
《金属热处理》2008年第33卷第4期
万方数据