Austenitic steel with improved stress corrosion cracking resistance characteristics, process for its production and its use

摘要

The present invention relates to an austenitic steel comprising Ni of 9 - 30 %, Cr of 10 - 23 %, and Fe of at least 45 %, which is characterized in comprising enough Cr and Ni to form whole austenitic structure in the equilibrium diagram at 700 DEG C, having austenitic phase at room temperature, and said austenitic phase is a single crystal, and has superior resistance against stress corrosion cracking. The austenitic steel is preferably comprising C /= 0.1 %, Si /= 1 %, Mn /= 2 %, Ni 9 - 15 %, Cr 16 - 18.5 %, and at least one of elements selected from the group of Mo 1 - 3 %, Ti 0.05 - 1 %, and Nb 0.1 - 1.5 %, as of an alloy composition. The alloy relating to the present invention is preferable as a material for members of a reactor core of a nuclear reactor. IMAGE