热处理工艺对超级13Cr不锈钢在饱和CO<sub>2</sub>油田地层水中腐蚀行为影响

doi:10.11902/1005.4537.2021.246

中国腐蚀与防护学报

2022, Vol. 42

Issue (5): 752-758 DOI: 10.11902/1005.4537.2021.246

研究报告

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热处理工艺对超级13Cr不锈钢在饱和CO₂油田地层水中腐蚀行为影响

潘鑫¹, 任泽², 连景宝¹, 何川¹, 郑平¹, 陈旭¹(

)

^1.辽宁石油化工大学石油与天然气工程学院抚顺 113001
^2.国家石油天然气管网集团有限公司山东运维中心济宁作业区济宁 272000

Effect of Heat Treatment Process on Corrosion Behavior of Super 13Cr Stainless Steel in CO₂-Saturated Oilfield Formation Aqueous Solution

PAN Xin¹, REN Ze², LIAN Jingbao¹, HE Chuan¹, ZHENG Ping¹, CHEN Xu¹(

)

^1.College of Petroleum Engineering, Liaoning Petrochemical University, Fushun 113001, China
^2.Jining Operation Area, Shandong Operation and Maintenance Center, National Petroleum and Natural Gas Pipeline Network Group Co. Ltd., Jining 272000, China

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摘要:

采用金相显微镜、XRD、电化学实验和慢应变速率拉伸等实验方法,研究了不同热处理工艺对超级13Cr不锈钢在饱和CO₂油田地层水中腐蚀行为的影响。结果表明,超级13Cr不锈钢经620 ℃回火处理后产生逆变奥氏体,二次回火处理会增加材料中逆变奥氏体的含量。不同热处理工艺下的超级13Cr不锈钢在饱和CO₂的油田地层水溶液中的极化曲线均存在明显钝化区间。与供货态相比,回火工艺使超级13Cr不锈钢耐蚀性下降,但二次回火能够提高材料的耐蚀性。超级13Cr耐蚀性与逆变奥氏体含量有关。淬火试样应力腐蚀开裂 (SCC) 敏感性最高。淬火试样、550和690 ℃回火试样的SCC机制为氢致开裂。620 ℃回火及二次回火试样因逆变奥氏体的存在,SCC敏感性降低,其开裂机制为混合断裂机制。

关键词 ：超级13Cr不锈钢, 热处理, 油田地层水, CO₂腐蚀

Abstract：

The corrosion behavior of super 13Cr stainless steel subjected to different heat treatment processes in CO₂-saturated oilfield formation water was assessed by means of metallographic microscope, XRD, electrochemical experiment and slow strain rate tensile method. The results showed that reversed austenite appeared in the super 13Cr SS after tempering at 620 ℃. A secondary tempering treatment could result in the increment of the amount of reversed austenite. There exists a passivation interval on polarization curves in CO₂-saturated oilfield formation solution for all the super 13Cr SSs after being subjected to different heat treatments. The tempering process could result in decrease in the corrosion resistance of super 13Cr SS, in the contrast, a secondary tempering could result in an enhancing effect. The corrosion resistance of super 13Cr SS was related to the content of reversed austenite. The oil-quenched 13Cr SS had the highest SCC sensitivity. The SCC mechanism of the quenched 13Cr SS, as well as the 13Cr SSs tempered at 550 and 690 ℃, respectively were all hydrogen induced cracking. The SCC sensitivity of 13Cr SSs after subjected to 620 ℃-tempering and 650 ℃+620 ℃ double-tempering, decreased due to the presence of reversed austenite, accordingly, the cracking mechanism was mixed fracture.

Key words： super 13Cr stainless steel heat treatment oilfield formation solution CO₂ corrosion

收稿日期: 2021-09-18

ZTFLH:

TG174

基金资助:教育部“春晖”国际合作计划项目和辽宁省教育厅面上项目(LJKZ0416)

通讯作者: 陈旭 E-mail: cx0402@sina.com

Corresponding author: CHEN Xu E-mail: cx0402@sina.com

作者简介: 潘鑫,女,1996年生,硕士生

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引用本文:

潘鑫, 任泽, 连景宝, 何川, 郑平, 陈旭. 热处理工艺对超级13Cr不锈钢在饱和CO₂油田地层水中腐蚀行为影响[J]. 中国腐蚀与防护学报, 2022, 42(5): 752-758.
Xin PAN, Ze REN, Jingbao LIAN, Chuan HE, Ping ZHENG, Xu CHEN. Effect of Heat Treatment Process on Corrosion Behavior of Super 13Cr Stainless Steel in CO₂-Saturated Oilfield Formation Aqueous Solution. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 752-758.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.246 或 https://www.jcscp.org/CN/Y2022/V42/I5/752

表1 超级13Cr不锈钢的热处理工艺

图1 SSRT试样尺寸图

图2 不同热处理条件下超级13Cr不锈钢的金相组织形貌

图3 经不同条件热处理后超级13Cr不锈钢的XRD图谱

图4 经不同条件热处理的超级13Cr不锈钢在饱和CO2油田地层水中的极化曲线

表2 极化曲线的拟合结果

图5 经不同条件热处理的超级13Cr不锈钢在饱和CO2油田地层水中的EIS图及等效电路

表3 不同条件热处理的超级13Cr不锈钢EIS拟合结果

图6 经不同条件热处理的超级13Cr不锈钢在饱和CO2油田地层水中的SSRT曲线及断面收缩率及延伸率

图7 经不同条件热处理的超级13Cr不锈钢主断口及侧断口形貌

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