HIGH WORKABILITY STEEL SHEET EXCELLENT IN HIGH STRENGTHENING CHARACTERISTIC BY IRRADIATION WITH HIGH DENSITY ENERGY SOURCE

摘要

PURPOSE: To obtain a steel sheet having excellent treating characteristic by specifying alloy components and constitution structure in the steel plate under a fixed irradiation condition. ;CONSTITUTION: This steel sheet is the highly workable steel sheet used after highly strengthening by irradiating the surface of the steel sheet with a high density energy source to form the solidified zone penetrating the sheet thickness. This steel sheet contains, by weight 0.02-0.3% C, ≤1.5% Si, 0.3-2.5% Mn and the balance Fe and has the structure composed of martensite, bainite and ferrite. Particularly, the steel sheet having K₁≥0.1 in K₁=(Mn% + 0.25Si%) × C%, is preferable. This steel sheet displays the excellent workability at the time of working and the excellent highly strengthening characteristic by the irradiation treatment with the high density energy source.;COPYRIGHT: (C)1994,JPO&Japio