Hydrogen Trapping Efficiency and HIC Sensitivity of Ti-Mg-Al Composite Deoxidized X70 Acid Resistant Submarine Pipeline Steel
XIAO Hu1,2, HUANG Feng1,2, PENG Zhixian1,2, GE Fangyu1,2, LIU Jing1,2
1 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China 2 Hubei Engineering Technology Research Centre of Marine Materials and Service Safety, Wuhan University of Science and Technology, Wuhan 430081, China
Abstract: NACE TM 0284-2016 standard was used to evaluate the hydrogen induced cracking (HIC) susceptibility of series of X70 grade anti-acid submarine Ti-Mg-Al composite deoxidization tested pipeline steels with different Al contents. The hydrogen diffusion kinetic behavior of X70 MOS pipeline steel was investigated through measuring the permeability (J∞L) and the apparent hydrogen diffusivity (Deff). The results indicated that the tensile strength of tested steels could be improved significantly due to the formation of acicular ferrite by the addition of Al. With increasing of Al contents, the amount of inclusions increased significantly, and single Mn-S and Al-Ti-Mg-O-Mn-S compound inclusions with uniform distribution changed into single Al-O and Al-Ti-O-Mn-S compound inclusions with chain distribution. When the content of Al was up to 0.03%, the yield strength of tested steel decreased, and H could be easily trapped around the brittle Al2O3 inclusions, and then caused internal microcracks and hydrogen bubbles on the surface of tested steel. The addition of Al for Ti-Mg composite deoxidization steel mainly made the characteristics of non-metallic inclusions happen, and then changed the dynamic behavior of hydrogen diffusion, finally affected the HIC susceptibility of tested steels. In this research range, the addition amount of Al should not exceed 0.03%.
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