LI Hiaogang
,
MENG Qinghai
,
CHEN Hua
,
CHEN Jinwei
,
YAO Zhiming
,
KE Wei(State Key Laboratory of Corrosion Science
,
Institute of Corrosion and Protection of Metals
,
Chinese Academy of Sciences
,
Shenyang 110015
,
China)(Fushun Petroleum Institute
,
Fushun 113001
,
China)
金属学报(英文版)
Hydrogen attack occurred in low carbon steel and steel 25CrMo which had been exposed in hydrogen under 18MPa at 450 and 500℃ for 240,480 and 720 h.The methane bubbles and microcracks grow along grain boundaries.The degree of hydrogen attack increases with increasing exposure time and temperature.Magnetic acoustic emission(MAE) was used to detect the degree of hydrogen attack.The results show that the characteristics of MAE for samples of low carbon steel and steel 15CrMo with hydrogen attack have changed obviously comparing to the samples without hydrogen attack,and the MAE signals was sensitive to the degree of hydrogen attack at the last stage of hydrogen attack.The magnetic detection way,as a new method of nonrestrictive testing of hydrogen attack,can be used to detect the hydrogen attack in practice.
关键词:
:magnetic acoustic emission
,
null
,
null
,
null
X.H Luo
,
T.J. Su
,
C.G Fan
,
Y Y Liand CX Shi(Institute of Metal Research
,
Chinese Academy of Sciences
,
Shenyang 110015
,
China)X Chen and A.M Guo (Iron & Steel Research Institute
,
Wuhan Iron & Steel (Group) Company
,
Wuhan 430083
,
China)
金属学报(英文版)
1.25Cr-0.5Mo steels with different Ti-B or Al-B treatment were exposed in 18 MPa hydrogen atmosphere at 480℃ fo f 100, 500 and 1000 h respectively. Tensile and bend properties of steels before and after hydrogen changing were tested. The results show that the different mechanical properties of the steels with different B content have different responses to high temperature high pressure hydrogen charging processes.After hydrogen changing, more loss of ductility can be found in the steel not treated with B than those in the steels treated with B. Metallographic analyses indicated that decarburization occurred in all the steels. Furthermore, many methane bubbles were found by SEM analysis in the surface decarburization layer in the steel without B,while only a few bubbles, the number and size of which decreased with increasing B content, were found in steels with B treatment. In addition, hydrogen determination results manifested that after being exposed in hydrogen atmosphere the steel containing no B had higher hydrogen content than that of steels containing B. All this suggests that B treatment improved the HA resistance of 1.25Cgr-0.5Mo steel, and the more B the steel contained the more perceptible the effect.
关键词:
boron
,
null
,
null
,
null
J.L. Li 1
,
2)
,
K.F. Wong 3) and G.H. Zhu 3) 1) Fushun Petroleum Institute
,
Fushun 113001
,
China 2) State Key Laboratory for Corrosion and Protection of Metal
,
Institute of Corrosion and Protection of Metals
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
China 3) Zhejiang University
,
Hangzhou 310027
,
China
金属学报(英文版)
This paper integrates the characteristic of structure design and manufacture and maintenance for Chinese flat steel band wound pressure vessel(UCWPV) with the problems existing in current in service high temperature and pressure vessel exposed to hydrogen. In view of economy and safety it is suggested that it be practicable for UCWPV to act as reactors for platreating, hydrogenating, and catforming. UCWPV has not only potential advantages, but also removes shortages present in in-service reactors for hydrogen.
关键词:
design
,
null
,
null
