M/A组元对高强度管线钢抗H<sub>2</sub>S性能的影响

doi:10.11902/1005.4537.2014.058

中国腐蚀与防护学报

2015, Vol. 35

Issue (2): 129-136 DOI: 10.11902/1005.4537.2014.058

本期目录 | 过刊浏览

M/A组元对高强度管线钢抗H₂S性能的影响

史显波^1,², 王威¹, 严伟¹, 单以银¹, 杨柯¹(

)

1. 中国科学院金属研究所沈阳 110016
2. 中国科学院大学北京 100049

Effect of Martensite/Austenite (M/A) Constituent on H₂S Resistance of High Strength Pipeline Steels

SHI Xianbo^1,², WANG Wei¹, YAN Wei¹, SHAN Yiyin¹, YANG Ke¹(

)

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. University of Chinese Academy of Sciences, Beijing 100049, China

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摘要:

研究了两种X90级别具有针状铁素体组织结构的高强度管线钢的抗H₂S性能。结果表明,具有大尺寸M/A组元的管线钢的抗H₂S性能不佳,表现为随着实验条件的加剧,氢致鼓泡密度增加,氢致开裂 (HIC) 参数提高,硫化物应力腐蚀开裂 (SSC) 失效时间变短。通过对比两种钢中不同尺寸、不同体积分数M/A组元的差异,结合SEM对氢致裂纹扩展路径进行观察,解释了M/A组元对H₂S腐蚀性能的影响及机理。控制M/A组元体积分数在8%以下和尺寸小于2 μm将不会影响管线钢的抗H₂S腐蚀行为。

关键词 ：高强度管线钢, 针状铁素体, 马氏体/奥氏体组元, 氢致开裂, 硫化物应力腐蚀开裂

Abstract：

Resistance to hydrogen sulfide (H₂S) corrosion was studied for two X90 grade high strength pipeline steels with the same microstructure of acicular ferrite (AF). The results showed that the AF microstructure with fine martensite/austenite (M/A) constituent had better resistances to both hydrogen-induced cracking (HIC) and sulfide stress corrosion cracking (SSC). The larger size M/A constituent in AF microstructure deteriorated the H₂S-resistance of the steels such as that with the decreasing pH value and increasing immersion time, the density of hydrogen-induced blisters on the steel surface increased and the HIC parameters increased, while its time-to-failure of SSC was shorter compared to the steel with finer M/A constituent. The different susceptibilities to H₂S cracking of the two high strength pipeline steels were interpreted from the view points of size and quantity of M/A constituent, which was observed from the HIC propagation path by SEM. It is suggested that X90 pipeline steels for sour gas/oil service should have a lower amount of M/A constituent (<8%) and an effective M/A constituent size control (<2 μm) by TMCP as well as a proper chemical composition optimization, thereby to ensure their resistance to H₂S.

Key words： high strength pipeline steel acicular ferrite martensite/austenite constituent hydrogen-induced cracking sulfide stress corrosion cracking

收稿日期: 2014-04-24

ZTFLH:

TG142.1

基金资助:“十二五”国家科技支撑计划项目 (2011BAE25B03)资助

作者简介: null

史显波，男，1988年生，博士生

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引用本文:

史显波, 王威, 严伟, 单以银, 杨柯. M/A组元对高强度管线钢抗H₂S性能的影响[J]. 中国腐蚀与防护学报, 2015, 35(2): 129-136.
Xianbo SHI, Wei WANG, Wei YAN, Yiyin SHAN, Ke YANG. Effect of Martensite/Austenite (M/A) Constituent on H₂S Resistance of High Strength Pipeline Steels. Journal of Chinese Society for Corrosion and protection, 2015, 35(2): 129-136.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.058 或 https://www.jcscp.org/CN/Y2015/V35/I2/129

表1 实验用钢的化学成分

表2 实验用钢的TMCP轧制工艺

图1 HIC试样取向及检测面示意图

图2 恒载荷应力腐蚀试样示意图

图3 两种管线钢显微组织的OM和SEM像

表3 实验用钢的力学性能

图4 两种钢氢致开裂 (HIC) 宏观腐蚀形貌

图5 B钢中氢鼓泡与氢致裂纹形貌

表4 两种钢的氢致裂纹参数

图6 两种钢的氢致裂纹扩展路径的SEM像

图7 Lapara腐蚀液腐蚀的A钢和B钢的光学组织形貌

图8 A钢和B钢中M/A岛平均尺寸分布图

表5 两种实验钢硫化物应力腐蚀开裂实验结果

图9 B钢在加载应力90%σs下SSC断口的SEM像

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