| 摘要 |
The present invention provides high-strength steel having excellent resistance to brittle crack propagation and a production method therefor. Provided according to the present invention are: high-strength steel, which has excellent resistance to brittle crack propagation, comprises 0.05-0.1 wt% of C, 0.9-1.5 wt% of Mn, 0.8-1.5 wt% of Ni, 0.005-0.1 wt% of Nb, 0.005-0.1 wt% of Ti, 0.1-0.6 wt% of Cu, 0.1-0.4 wt% of Si, at most 100 ppm of P, and at most 40 ppm of S with the remainder being Fe and other inevitable impurities, and has microstructures including one structure selected from the group consisting of a single-phase structure of ferrite, a single-phase structure of bainite, a complex-phase structure of ferrite and bainite, a complex-phase structure of ferrite and pearlite, and a complex-phase structure of ferrite, bainite, and pearlite; and a production method therefor. According to the present invention, high-strength steel having high yield strength and excellent resistance to brittle crack propagation can be obtained. |
