Development and application of BRP technology in Baosteel

Jiang, Xin; Chen, Zhaoping; Lu, Zhi-xin; Zhang, Geng; Zhong, Zhou

doi:10.1051/metal/20070107

Cited by 1 publication

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“…Accordingly, considerable efforts have been made to develop the steel used as pressure vessel facilities with superior resistance to HAC [ 7 , 8 , 9 , 10 ]. For this purpose, a variety of technical solutions, such as de-phospho/sulfu-rization of molten steel [ 11 , 12 ], Ca-treatment [ 13 ], cast steel soft reduction [ 14 ], and thermal mechanical controlled process (TMCP) [ 15 , 16 , 17 ], have been proposed. Microstructural modifications by reducing the number of second phases, such as retained austenite (RA), martensite-austenite constituents (MA), and other hard phases, and their role in improving the HAC resistance, have been reported [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments

et al. 2020

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This study examined the effects of alloying elements (C, Mo) on hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC) behaviors of A516-65 grade pressure vessel steel in sour environments. A range of experimental and analytical methods of HIC, SSC, electrochemical permeation, and immersion experiments were used. The steel with a higher C content had a larger fraction of banded pearlite, which acted as a reversible trap for hydrogen, and slower diffusion kinetics of hydrogen was obtained. In addition, a higher hardness in the mid-thickness regions of the steel, due to center segregation, resulted in easier HIC propagation. On the other hand, the steel with a higher Mo content showed more dispersed banded pearlite and a larger amount of irreversibly trapped hydrogen. Nevertheless, the addition of Mo to the steel can deteriorate the surface properties through localized pitting and the local detachment of corrosion products with uneven interfaces, increasing the vulnerability to SSC. The mechanistic reasons for the results are discussed, and a desirable alloy design for ensuring an enhanced resistance to hydrogen assisted cracking (HAC) is proposed.

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