成果報告書詳細
管理番号20120000000387
タイトル*平成23年度中間年報 水素製造・輸送・貯蔵システム等技術開発 水素ステーション機器要素技術に関する研究開発 水素用アルミニウム材料の評価・開発 (4)
公開日2013/3/20
報告書年度2011 - 2011
委託先名株式会社神戸製鋼所
プロジェクト番号P08003
部署名新エネルギー部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等
1. 1 事業概要
高圧水素ガス容器等への使用を、JARI -SOO 11 が認めているアルミニウム合金は、中強度合金の6061-T6 のみである。バルブハウジングや VH4 複合容器の口金においては、自緊処理が施されな いため、高強度材適用による軽量化の効果は大きいと考える。
英文要約Title:Development of Technologies for Hydrogen Production, Delivery and Storage Systems. Research and Development of Elemental Technologies for Hydrogen Station Components. Assessment and Development of Aluminum Materials for Hydrogen (FY2010-FY2012) FY2011 Annual Report (4)
Among aluminum alloys, the only material that is allowed to be applied to the liner materials, cap members, etc. of high pressure hydrogen gas compound containers is medium strength alloy 6061-T6.As for compound containers, autofrettage treatment is not applied to VH4 containers; therefore, we think that the effect of container weight reduction due to the application of high strength materials is large. Among the four entities, namely, Ibaraki University, Furukawa-Sky Aluminum Corp., Nippon Light Metal Company, Ltd. and Kobe Steel Ltd., we, Kobe Steel Ltd., take charge of the research and development of container-related aluminum members such as caps, and decided to analyze the possibility of reduction in weight and cost of containers due to the application of high strength 6000 series alloys. In fiscal 2011, we selected 6066-T6 and 6069-T6 from high-strength aluminum 6000 series alloy, and manufactured the forging material to determine the property.
(1) The yield strength (LT) of 6066-T6 is 380MPa with median chemical standard. 6066-T6 is a high-strength material having a yield strength of about 21% higher than 6061-T6, while the yield strength of 6061-T6 is 314MPa. It has low hydrogen embrittlement susceptibility (SSRT) with the same level as 6061-T6. However, it has a significant extent of intergranular corrosion, as well as high SCC susceptibility; therefore, it is estimated to be difficult to meet the general corrosion resistance specified in the technical requirements (The Japan Gas Association).
(2) The yield strength (LT) of 6069-T6 is 365MPa with median chemical standard, and 359MPa with lower limit Cu. Both materials with median chemical and with lower limit Cu are high-strength material, having yield strength of about 16% and 14% higher than 6061-T6, respectively. It has low hydrogen embrittlement susceptibility (SSRT) with the same level as 6061-T6. In addition, either alloy has a negligible extent of intergranular corrosion to meet the technical requirements. However, it has generally low SCC resistance, which is such that 6069-T6 with lower limit Cu satisfactory meets the technical requirements.
(3) In fiscal 2012, we will continue to study on the hydrogen embrittlement of 6066-T6 and 6069-T6, using fatigue test besides SSRT. We will select the alloy suitable for mouthpiece parts, using the properties such as tensile strength and general corrosion resistance, in addition to the embrittlement characteristic. We will also manufacture the forging material that simulates a mouthpiece part to determine the property, and then we will identify the merit and problem of applying to mouthpiece parts.
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