| 摘要 |
The present invention relates to a steel material for a pressure container used in a cryogenic environment, and air containing hydrogen sulfide. More specifically, the present invention relates to the steel material with excellent hydrogen induced cracking resistance and low-temperature toughness for a pressure container, and a method to manufacture the same. The present invention comprises: 0.03-0.07 wt% of carbon (C), 0.2-0.5 wt% of silicon (Si), 0.8-1.5 wt% of manganese (Mn), 0.005-0.035 wt% of solution aluminum (Sol.Al), 0.002-0.015 wt% of niobium (Nb), 0.002-0.015 wt% of vanadium (V), 0.005 wt% or less of titanium (Ti) (excluding 0 wt%), 0.01-0.40 wt% of copper (Cu), 0.01-0.40 wt% of nickel (Ni), 0.01-0.20 wt% of chromium (Cr), 0.01-0.30 wt% of molybdenum (Mo), 0.0005-0.0040 wt% of calcium (Ca), 0.006-0.015 wt% of nitrogen (N), 0.01 wt% or less of phosphorus (P) (excluding 0 wt%), 0.001 wt% or less of sulfur (S) (excluding 0 wt%), and the remaining consisting of Fe and other unavoidable impurities. |
