| 摘要 |
<p>A first embodiment of the inventive maraging steel which has an essential composition: C: 0.01 % or less, Ni: 8 to 19 %, Co: 8 to 20 %, Mo: 2 to 9 %, Ti: 0.1 to 2 %, Al: 0.15 % or less, N: 0.003 % or less, O: 0.0015 % or less, balance: Fe, and has the component segregation ratios for Ti and Mo in its structure of 1.3 or less each; and another embodiment of the inventive maraging steel which has the above composition and contains a non-metal substance having a size of 30 νm or less. The second embodiment of maraging steal can be easily prepared by subjecting to appropriate plastic working a steel ingot having a taper Tp = (D1 - D2) x 100/H of 5.0 to 25.0 %, a height-diameter ratio Rh = H/D of 1.0 to 3.0, and a flatness ratio B = W1/W2 of 1.5 or less.</p> |
