Advanced High Tensile Strength Steel of 100 kgf/mm^2 Grade for Penstock Use :

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The applicability of a 100 kgf/mm^2 grade high tensile strength steel developed for penstock was evaluated in this paper. Firstly, Jive kinds of weld cracking tests were performed and it was demonstrated that the 100 kgf/mm^2 grade steel, including its weld metal, has a good resistance to cold cracking. Secondly, its mechanical properties and fracture toughness were investigated and evaluated the safety of its weldment against brittle fracture. Finally, the correlation between its fracture toughness and absorbed energy obtained by Charpy-V impact test was investigated, and Charpy- V values being required to prevent the brittle fracture were proposed.

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