Steel material having excellent hydrogen induced cracking resistance, and manufacturing method therefor

A manufacturing method for a steel material having excellent hydrogen induced cracking resistance, comprising:

• reheating a steel slab in a temperature range of 1150 to 1250° C., the steel slab comprising, by wt %, 0.10 to 0.25% of carbon (C), 0.05 to 0.50% of silicon (Si), 1.0 to 2.0% of manganese (Mn), 0.005 to 0.1% of aluminum (Al), 0.010% or less of phosphorus (P), 0.0015% or less of sulfur (S), 0.001 to 0.03% of niobium (Nb), 0.001 to 0.03% of vanadium (V), 0.001 to 0.03% of titanium (Ti), 0.01 to 0.20% of chromium (Cr), 0.01 to 0.15% of molybdenum (Mo), 0.01 to 0.50% of copper (Cu), 0.05 to 0.50% of nickel (Ni), 0.0005 to 0.0040% of calcium (Ca), a balance of Fe, and other inevitable impurities;
• finish hot rolling the reheated steel slab in a temperature range of 800 to 1100° C. to manufacture a hot-rolled steel sheet;
• cooling the hot-rolled steel sheet to a temperature directly above Bs at a cooling rate of 3 to 60° C./s;
• and
• performing normalizing heat treatment for heating the hot-rolled steel sheet to 860 to 930° C. after the cooling, maintaining the hot-rolled steel sheet for 15 to 60 minutes, and then air-cooling the hot-rolled steel sheet to room temperature,
• wherein a reduction ratio per pass at the time of finish hot rolling the reheated steel slab is 5% or less.