Resistance to Hydrogen Induced Corrosion Cracking of Weld Joint of X100 Pipeline Steel

doi:10.11902/1005.4537.2013.088

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (3): 237-242 DOI: 10.11902/1005.4537.2013.088

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Resistance to Hydrogen Induced Corrosion Cracking of Weld Joint of X100 Pipeline Steel

WANG Bin¹(

), ZHOU Cui¹, LI Liangjun², HU Hongmei¹, ZHU Jiaxiang¹

1. School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China
2. Sichuan Kehong Oil and Gas Engineering CO., LTD., Chengdu 61000, China

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Abstract

The resistance to hydrogen induced corrosion cracking (HIC) of the weld joint of X100 pipeline steel prepared by gas shielding metal arc welding was studied. OM and SEM with EDS were adopted to characterize the microstructure of the X100 weld joint and the non-metallic inclusions. The experimental results presented that the X100 weld joint exhibited a microstructure consisted of acicular ferrite, bainite and M/A islets, MnS, Al-oxide, Si-oxide and Al-Mg-O, Ca-Al-O-S mixed inclusions were also found in the weld joint. The weld joint had a high susceptibility to HIC due to the large amounts of non-metallic inclusions, furthermore, the interfaces and stress between the matrix and brittle M/A islets as well as inclusions might play an important role in the initiation of HIC cracks and then the cracks propagated along the grain boundaries of the coarse bainite.

Key words: X100 pipeline steel HIC Non-metallic inclusion M/A constituent

Received: 03 June 2013

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Cite this article:

WANG Bin, ZHOU Cui, LI Liangjun, HU Hongmei, ZHU Jiaxiang. Resistance to Hydrogen Induced Corrosion Cracking of Weld Joint of X100 Pipeline Steel. Journal of Chinese Society for Corrosion and protection, 2014, 34(3): 237-242.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.088 OR https://www.jcscp.org/EN/Y2014/V34/I3/237

表1 X100管线钢焊接工艺参数

Fig.1

裂纹尺寸测量示意图

表2 X100管线钢焊接接头HIC实验结果

Fig.2

HIC裂纹的OM和SEM像

Fig.3

X100管线钢焊接接头的OM像

Fig.4

焊缝的SEM像

Fig.5

焊接接头硬度分布

Fig.6

X100管线钢母材及焊缝中的夹杂物类型及形貌

表3 X100管线钢焊接接头非金属夹杂物级别

Fig.7

X100管线钢焊缝金属中夹杂物的形貌及EDS分析

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