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- 저자 : Sungbeon Kang(강성범) (검색결과 1 건)
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Hyung-Seop Shin(신형섭),Eunsu Min(민은수),Sungbeon Kang(강성범),Un-Bong Baek(백운봉) 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.11
The introduction of hydrogen pipelines as a method for mass transportation of hydrogen is being considered. In the case of low pressure, it can be considered to use the current pipeline steels for natural gas supply. Quantitative evaluation of the hydrogen embrittlement (HE) sensitivity of pipeline steel welds is necessary in terms of securing stability. ANU group has been established simple screening techniques for HE compatibility of metallic materials, which is adopting both an in-situ small-punch (SP) test method and a simple SSRT using hollow tensile specimens corresponding to the ‘external hydrogen’ condition. Relative reduction of thickness (RRT), a characteristic factor suitable for the established in-situ SP test, was proposed, and the validity of RRT in screening HE susceptibility of various steels could be confirmed by comparison to RRA obtained by a simple SSRT. Practically, there are difficulties in performing SSRT and obtaining comparative data in a high-pressure hydrogen environment. There is a limitation to practically expand the in-situ SP test although it is a simple and effective test technique and to obtain the data validity. Therefore, in this study, for pipeline steel (API X70) welds, a simple SSRT test method using hollow tensile test pieces was newly established based on the similar test principle to the in-situ SP test. It was attempted to support the data reliability and validity of the in-situ SP test through the comparison of RRT to RRA obtained from SSRT tests in high pressure hydrogen environment.
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