Document Type and Number:
Japanese Patent JPWO2022118592
Kind Code:
A1
Abstract:
Provided is a steel plate that has high strength and has excellent cryogenic toughness uniformly in the steel plate regardless of the thickness. A steel plate comprises a chemical composition containing, in mass%, C: 0.01 % to 0.15 %, Si: 0.01 % to 0.50 %, Mn: 0.05 % to 0.60 %, Ni: 6.0 % to 7.5 %, Cr: 0.01 % to 1.00 %, Mo: 0.05 % to 0.50 %, P: 0.03 % or less, S: 0.005 % or less, and N: 0.0010 % to 0.0080 %, with a balance consisting of Fe and inevitable impurities, wherein at a position of 1/4 × t, a decrease ratio of an amount of retained y between before and after deep cooling treatment at -196 °C is less than 5 vol% and the amount of retained y after the deep cooling treatment is 0.5 vol% or more.
Application Number:
JP2022513036A
Publication Date:
June 09, 2022
Filing Date:
November 01, 2021
Export Citation:
