| 摘要 |
PCT No. PCT/JP95/00602 Sec. 371 Date Nov. 21, 1995 Sec. 102(e) Date Nov. 21, 1995 PCT Filed Mar. 29, 1995 PCT Pub. No. WO95/26424 PCT Pub. Date Oct. 5, 1995The present invention relates to a process for producing a structural steel plate, which process greatly improves the excellent brittle crack propagation arrest characteristics and Charpy characteristics at the same time without relying on the addition of costly alloying elements such as Ni. The steel plate is characterized in that the steel plate comprises, based on weight, 0.04 to 0.30% of C, up to 0.5% of Si, up to 2.0% of Mn, up to 0.1% of Al, 0.001 to 0.10% of Ti, 0.001 to 0.01% of N and the balance Fe and unavoidable impurities, that the structure in the front surface region and the back surface region each having a thickness corresponding to 2 to 33% of the plate thickness has an average grain size d of up to 3 mu m, and that the structure has a controlled Vickers hardness.
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