Effect of Hydrogen Sulfide Corrosion on Fracture Toughness of X80 Pipeline Steel

doi:10.11901/1005.3093.2015.429

Chinese Journal of Materials Research

2016, Vol. 30

Issue (3): 179-185 DOI: 10.11901/1005.3093.2015.429

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Effect of Hydrogen Sulfide Corrosion on Fracture Toughness of X80 Pipeline Steel

WANG Jing^**(

), LUAN Chunbo

(College of Mechanical Engineering and Applied Electronics Technology, BeijingUniversity of Technology, Beijing 100022, China)

Cite this article:

WANG Jing, LUAN Chunbo. Effect of Hydrogen Sulfide Corrosion on Fracture Toughness of X80 Pipeline Steel. Chinese Journal of Materials Research, 2016, 30(3): 179-185.

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Abstract

Fracture toughness of X80 pipeline steel in a simulated petrochemical environment is studied in this paper. Original specimens and saturated H₂S pre-corroded specimens were tested respectively and δ-Δa resistance curves were obtained, while the influence of hydrogen sulfide corrosive environment on the resistance curve, fracture toughness and plastic work of X80 pipeline steel was analyzed. It follows that the lower limit of K_IC of the pre-corroded X80 steel is 75.43 MPam^½, and the hydrogen sulfide corrosion affect significantly on the fracture toughness of X80 steel: the crack growth resistance curve obtained from original specimens is much higher than that of the pre-corroded specimens; the fracture toughness of stable crack propagation δ_0.2BL is 0.740 mm and 0.365 mm respectively, and the former is 2.02 times of the latter. In case for a given amount of crack propagation Δa, the plastic work of the original specimen is about 2.29 times of the pre-corroded specimen. Hydrogen sulfide corrosion reduced the fracture toughness of the X80 steel remarkablely. Thus, in the course of natural gas pipeline, hydrogen sulfide corrosive environment should be avoided to keep the steel a proper high toughness to prevent damage.

Key words: metallic materials fracture toughness resistance curve hydrogen sulfide corrosion

Received: 27 July 2015

ZTFLH:

O346.1+2

Fund: *Supported by National Natural Science Foundation of China No.11302007

About author: **To whom correspondence should be addressed, Tel: 13810101879, E-mail: wjing@bjut.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.429 OR https://www.cjmr.org/EN/Y2016/V30/I3/179

Table 1 The main mechanical properties of X80 pipeline steel

Fig.1 Diagram of specimens for three-point bending test (mm)

Sample number	F_max / kN	F_Q / kN	F_max/F_Q	a₀ / mm	B / mm	W-a₀ / mm	g₁	K_Q /MPam^1/2	R_P0.2 /MPa	$2.5 K Q R P 0.2 2$ / mm	Validity judgment
10#	23.85	15.57	1.53>1.10	15.64	15.01	14.36	2.84	59.93	661.0	20.55	Invalid
13#	24.49	16.31	1.50>1.10	14.53	15.10	15.27	2.54	65.79	661.0	24.77	Invalid
14#	24.93	18.99	1.31>1.10	14.71	15.02	15.29	2.58	75.43	661.0	32.55	Invalid

Table 2 Test values of plain strain fracture toughness K_IC of corroded X80 pipeline steel

Fig.2 The curvesof loading force F vs. displacement of crack mouth V for saturated H₂S pre-corroded X80 pipeline steel (a) 10 # specimen; (b) 13# specimen; (c) 14# specimen

Table 3 Test values of fracture toughness δ_0.2BL of uncorroded X80 pipeline steel

Table 4 Test values of fracture toughness δ_0.2BL of corroded X80 pipeline steel

Fig.3 δ-Δa resistance curves of (a) original and (b) saturated H₂S pre-corroded X 80 specimens

Fig.4 The value of δ_Q0.2Bland validity judgment of (a) original specimens and (b) saturated H₂S pre-corroded specimens

Experiment condition	Data distribution requirements	δ_Q0.2BL	δ_max	1.87(R_m/R_p0.2)	$2 dδ da 0.2 BL$	Validity judgment
Original	Meet conditions	0.740	0.749	2.170	0.886	Valid
Pre-corroded	Meet conditions	0.365	0.686	2.170	0.451	Valid

Table 5 Values of δ_Q0.2BL and validity judgment

Fig.5 Comparison of resistance curves of original and saturated H₂S pre-corroded X80 specimens

Fig.6 Comparison of displacement-force curvesof original andsaturated H₂S pre-corroded X 80 specimens

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