| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide high strength austenitic heat-resistant steel with which the chemical compositions of the austenitic heat-resistant steel are optimized, and especially, creep-rupture strength of≥100 MPa at 700°C for 100,000 hrs is secured by optimally and compositely adding Mo, W and N. <P>SOLUTION: The high strength austenitic heat-resistant steel contains, by mass%, 0.01-0.12% C, 0.2-1.0% Si, 1.0-2.5% Mn, 10.0-28.0% Ni, 18.0-26.0% Cr, 0.001-0.050% Al,≤0.040% P,≤0.010% S, 0.09-0.30% N, 0.25-0.70% Nb+V, 1.5-4.0% Mo+0.5W, and 3-16 W/Mo, and is composed of the balance Fe and inevitable impurities. Then, in the high strength austenitic heat-resistant steel, a solid-solution treatment at 1,180-1,250°C is performed while the following formula (1) is satisfied: (Mo+0.5W)×N-1.48×N≥0.21. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
