Patent ID: 11203804

Abstract:
A nickel-containing steel plate for use at a low temperature, having a predetermined chemical composition, in which the volume fraction of retained austenite at a position 1.5 mm from the surface of the steel plate in the thickness direction is from 3.0 to 20.0% by volume; in which the maximum distance between adjacent grains of retained austenite on prior austenite grain boundaries at the position 1.5 mm from the surface of the steel plate in the thickness direction is 12.5 μm or less; and in which the circle equivalent diameter of grains of retained austenite at a position corresponding to ¼ of the plate thickness from the surface of the steel plate in the thickness direction is 2.5 μm or less. A tank for use at a low temperature, which is produced using the above described nickel-containing steel plate for use at a low temperature.