| 摘要 |
<p>A heat-resistant, austenitic cast steel having excellent machinability comprising by mass 0.4-0.55% of C, 1-2% of Si, 0.5-1.5% of Mn, 18-27% of Cr, 8-22% of Ni, 1.5-2.5% ofNb, 0.01-0.3% of N, 0.1-0.2% of S, and 0.02-0.15% of Al, the balance being Fe and inevitable impurities, a machinability index I represented by the following formula: I = 100 x S + 75 x Al + 0.75 x Mn - 10 x C - 2 x Nb - 0.25 x Cr - 0.15 x Ni - 1.2 x N, wherein each element symbol represents % by mass of each element in the cast steel, meeting the condition of -3.0 ‰¤ I ‰¤ +14.0, and an exhaust member made thereof.</p> |
