Structural steel having excellent brittle crack propagation resistance, and manufacturing method therefor

A method for manufacturing a structural steel having excellent brittle crack propagation resistance, the method comprising:

• reheating a slab including, by wt %, 0.02 to 0.12% of C, 0.01 to 0.8% of Si, 1.7 to 2.5% of Mn, 0.005 to 0.5% of Al, and the balance of Fe and inevitable impurities in a temperature range of 1050 to 1250° C.;
• rough rolling the slab at a temperature of Tnr to 1150° C.;
• first cooling the rough rolled steel to a temperature of Ms to Bs at a cooling rate of 5° C./s or higher, based on a temperature of the surface part of the rough rolled steel;
• heat recuperating the steel by maintaining a surface part of the first-cooled steel to a temperature range of (Ac1+40° C.) to (Ac3−5° C.) by heat recuperation;
• finish rolling the heat-recuperated steel;
• and
• second cooling the finish rolled steel to a temperature range of Ms to Bs° C. at a cooling rate of 5° C./s or higher.