日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 79, No. 3 (2015),
pp. 100-106

Mechanical Properties and Room-Temperature Creep Deformation of Hydrogen-Charged Low-Mo Austenitic Stainless Steels for High-Pressure Hydrogen Use

Kazumasa Kubota and Yoshinori Watanabe

Aichi Steel Corporation, Tokai 476-8666

Abstract:

The development of low-Mo austenitic stainless steels for high-pressure hydrogen valves and joints was undertaken to contribute to resource saving. Low-strain-rate tensile tests were carried out at 233 K in 70 MPa high-pressure gaseous hydrogen. The fracture surfaces of specimens tested in high-pressure gaseous hydrogen were observed by scanning electron microscopy. The effect of hydrogen charging on room-temperature creep deformation was studied. The resistance of the specimens to hydrogen gas embrittlement was revealed by the results of the low-strain-rate tensile tests. Specimens that fractured in gaseous hydrogen at 70 MPa in 233 K underwent shear deformation rather than cup-and-cone deformation. A small difference in the creep deformation was recognized between hydrogen-charged and uncharged specimens. [doi:10.2320/jinstmet.JC201403]


(Received 2014/9/1)

Keywords:

austenitic stainless steel, high-pressure gaseous hydrogen, low-strain-rate tensile test, hydrogen charging, room-temperature creep deformation


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