| 摘要 |
Provided are: a high-strength hot-rolled steel sheet having excellent punchability and toughness; and a manufacturing method therefor. The present invention comprises C: 0.060-0.140% inclusive, Si: 1.00% or less, Mn: 1.30-2.50% inclusive, P: 0.030% or less, S: 0.0050% or less, Al: 0.070% or less, N: 0.010% or less, Ti: 0.060-0.140% inclusive, Cr: 0.10-0.50% inclusive, B: 0.0002-0.0020% inclusive, 5.0≤18C+Mn+1.3Cr+1500B≤6.0, with the remainder comprising Fe and unavoidable impurities. The present invention includes a bainite phase having a main phase in an area ratio exceeding 90% or further includes one or more from among a ferrite phase, a martensite phase, and a residual austenite phase in an area ratio of less than 10% total. The average particle size of the bainite phase is 2.5 µm or less, and Fe-based carbide intervals precipitating in bainitic ferrite particles in the bainite phase are 600 nm or less. |
