|
|
STRESS CORROSION CRACKING BEHAVIOR OF X100 PIPELINE STEEL IN NS4 SOLUTION UNDER CONSTANT LOADING TEST |
JIA Yizheng, WANG Jianqiu, HAN En-Hou, KE Wei |
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
|
|
Abstract Currently there is a demand to transport crude oil and gas by pipeline at a higher operating pressure in order to increase the capacity. For the investment reduction of long distance crude oil and natural gas pipeline project, the X100 grade ultrahigh strength pipeline steel will be adopted. Stress corrosion cracking (SCC) in pipeline is an important problem that threatens the safe operation of oil and gas transmission. Therefore, it is necessary to study SCC behavior of X100 pipeline steel in a standard near-neutral pH solution, NS4 solution. In this paper, constant loading tests of X100 pipeline steels were conducted at open circuit condition in deaerated NS4 solution. The results show that X100 pipeline steel under constant load in deareated NS4 solution exhibit transgranular stress corrosion cracking behavior. Even though the applied stress was less than the yield stress of X100 pipeline steel, stress corrosion cracking also occurred. It was found crack initiated at the interface of bainite phase and ferrite phase, M/A constituent and matrix, carbide and ferrite in bainite.
|
Received: 19 March 2010
|
|
[1] Ji L K, Wu J Z. Progress in standards and norms of high-strength line pipe[J]. Oil Tubular Goods Eng.,2007, 13(2): 48-62 (吉玲康, 吴敬梓. 高强度管线管标准和规范的进展[J]. 石油管工程, 2007, 13(2): 48-62)[2] Ji, L K, Li H L, Feng Y R, et al. Application technology and development of high grade line pipes[J]. Oil Tubular Goods Eng., 2007, 13(5): 1-11 (吉玲康, 李鹤林, 冯耀荣等. 高钢级管线钢管应用技术的发展及方向[J]. 石油管工程. 2007, 13(5): 1-11)[3] Fang B Y, Atrens A, Wang J Q. Review of stress corrosion cracking of pipeline steels in “low” and “high” pH solutions[J]. J. Mater. Sci., 2003, 38: 127-132[4] Wang B Y, Huo L X, Wang D P, et al. Stress corrosion cracking of X80 pipeline steel in near-neutral pH values solutions[J]. J. Tianjin Univ., 2007, 40(6): 757-760 (王炳英, 霍立兴, 王东坡等. X80管线钢在近中性pH溶液中的应力腐蚀开裂[J]. 天津大学学报, 2007, 40(6): 757-760)[5] Gu B, Yu W Z, Luo J L, et al. Transgranular stress corrosion cracking of X-80 and X-52 pipeline steels in dilute aqueous solution with near-neutral pH[J].Corrosion. 1999, 55(3): 312-319[6] Guo H, Li G F, Cai X, et al. Stress corrosion cracking behavior of X70 pipeline steel in near-neutral pH solutions at different temperature[J]. Acta Metall. Sin., 2004,40(9): 967-971 (郭浩, 李光福, 蔡珣等X70管线钢在不同温度近中性pH溶液中的应力腐蚀破裂行为[J]. 金属学报, 2004, 40(9): 967-971)[7] Beavers J A, Harle B A. Mechanism of high-pH and near-neutral pH SCC of underground pipelines [A]. In Proc. 1st inter. Pipeline Conf., IPC/96, paper 573 [C].ASME 1996: 555-564[8] National Energy Board. Report of Public Inquiry Concerning Stress Corrosion Cracking on Canadian Oil and Gas Pipelines [M]. MH-2-95, November 1996[9] Rebak R B, Xia Z, Safruddin R, et al. Effect of solution composition and electrochemical potential on stress corrosion cracking of X-52 pipeline steel[J]. Corrosion, 1996, 52: 396-405[10] Wang Y Z, Revie R W, Parkins R N. Mechanistic Aspects of Stress Corrosion Crack Initiation and Early Propagation [A]. Corrosion [C]. Houston, TX: NACE,1999, paper No.0143[11] Fang B Y, Han E H, Wang J Q, et al. Stress corrosion cracking of X-70 pipeline steel in near neutral pH solution subjected to constant load and cyclic load testing[J]. Corros. Eng. Sci. Technol.,2007, 42(2): 123-129[12] Parkins R N, Blanchard J W K, Delanty B S. Transgranular stress corrosion cracking of high-pressure pipeline in contact with solutions of near neutral pH[J].Corrosion. 1994, 50(5): 394-408[13] Parkins R N. A review of stress corrosion cracking of high pressure gas pipelines [A]. Corrosion [C].Houston, TX: NACE, 2000, paper No.00363[14] Fang H S, Yang Z G, Yang J B, et al. Research on bainite transformation in steel[J]. Acta Metall. Sin.,2005, 41(5): 449-457 (方鸿生, 杨志刚, 杨金波等. 钢中贝氏体相变机制的研究[J]. 金属学报. 2005, 41(5): 449-457) |
No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
|
Shared |
|
|
|
|
|
Discussed |
|
|
|
|