SCC Susceptibility of 2.25Cr1Mo Steel and Its Weld Joints in High Temperature Steam

doi:10.11902/1005.4537.2021.157

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (4): 647-654 DOI: 10.11902/1005.4537.2021.157

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SCC Susceptibility of 2.25Cr1Mo Steel and Its Weld Joints in High Temperature Steam

LIU Yutong¹, CHEN Zhenyu¹, ZHU Zhongliang¹, FENG Rui², BAO Hansheng³, ZHANG Naiqiang¹(

)

^1.Key Laboratory of Power Station Energy Transfer Conversion and System, North China Electric Power University, Beijing 102206, China
^2.Nuclear Power Division, China Huaneng Group Co. Ltd., Beijing 100031, China
^3.Institute for Special Steels, Central Iron & Steel Research Institute, Beijing 100081, China

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Abstract

The stress corrosion cracking (SCC) susceptibility of a new type of 2.25Cr1Mo steel and its weld joints was studied by means of slow strain rate tensile (SSRT) tests at a constant strain rate of 1×10^-6/s in air and steam at 0.1 MPa/500 ℃ respectively, in order to evaluate its suitability for heat exchanging pipes. The morphology of fracture surface, gage surface and cross-section were analyzed by scanning electron microscopy (SEM). The element composition of oxide scales was determined by energy spectrum analysis (EDS). Experimental results showed that the tensile strength and elongation at break of weld joints were lower than that of base metal in steam at 500 ℃, whilst the elongation at break of which in high temperature steam was higher than that in air. All specimens exhibited features of simple ductile fracture and low SCC susceptibility, cracking occurred only in the oxide scale which was near the fracture, without extending to the matrix. In addition, cracking did not occur near the fusion boundary after SSRT. In conclusion, welding had little effect on SCC susceptibility.

Key words: 2.25Cr1Mo steel stress corrosion cracking high temperature water weld joint

Received: 06 July 2021

ZTFLH:

TM623

Fund: National Natural Science Foundation of China(52071140);Fundamental Research Funds for the Central Universities(2020MS007)

Corresponding Authors: ZHANG Naiqiang E-mail: zhnq@ncepu.edu.cn

About author: ZHANG Naiqiang, E-mail: zhnq@ncepu.edu.cn

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	Yutong LIU
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	Naiqiang ZHANG

Cite this article:

LIU Yutong, CHEN Zhenyu, ZHU Zhongliang, FENG Rui, BAO Hansheng, ZHANG Naiqiang. SCC Susceptibility of 2.25Cr1Mo Steel and Its Weld Joints in High Temperature Steam. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 647-654.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.157 OR https://www.jcscp.org/EN/Y2022/V42/I4/647

Table 1 Chemical compositions of the test steel and weld metal (mass fraction / %)

Fig.1 Schematic drawings of sampling location (a) and the geometry and dimensions (mm) of the specimen (b)

Fig.2 Stress-strain curves of the test steel and its weld joints

Table 2 Summary of SSRT test parameters and mechanical properties at 500 ℃/0.1 MPa

Fig.3 SEM images of the fracture surfaces of the test steel and its weld joints in steam environment: (a) test steel-2, (b) Z124-2, (c) Z125-2, (d) center and (e) edge regions for Z124-2

Fig.4 Photograph of the weld joint specimen Z124-2 before and after SSRT test (a) and high magnifi-cation view of the cracked region (b)

Fig.5 SEM surface images of various samples in the gage sections: (a) test steel-1, (b) test steel-2, (c) Z124-1, (d) Z124-2, (e) Z125-1, (f) Z125-2

Fig.6 Cross-sectional morphology of Z124-2 after SSRT (near the fracture) (a), EDS line scannings along marked black line (b) and elemental mappings of Fe (c1), Cr (c2), O (c3), Mo (c4)

Fig.7 Cross-sectional morphology of Z124-2 after SSRT (near the fusion boundary) (a) and EDS elemental line scannings along marked black line (b, c)

Fig.8 Tensile strength,SCC susceptibility (a) and reduction (b) of test steel and its weld joints

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