NICKEL-CONTAINING STEEL SHEET FOR LOW-TEMPERATURE APPLICATIONS AND TANK USING NICKEL-CONTAINING STEEL SHEET FOR LOW-TEMPERATURE APPLICATIONS

摘要

Provided are: a nickel-containing steel sheet for low-temperature applications which has a prescribed chemical composition, a residual austenite volume fraction of 3.0-20.0 vol% at a position 1.5 mm from the surface in the thickness direction, and a maximum distance of at most 12.5 µm between adjacent residual austenite grains on a prior austenite grain boundary at the position 1.5 mm from the surface in the thickness direction, wherein residual austenite grains have an equivalent diameter of at most 2.5 µm at a position 1/4 of the sheet thickness from the surface in the thickness direction; and a tank using a nickel-containing steel sheet for low-temperature applications.