| 摘要 |
A heat-reistant cast steel having a metal matrix substantially consisting of a ferrite phase and a pearliticcolony phase has a composition consisting essentially, by weight, of C: 0.05 - 0.25 %, Si: 2.5 - 3.5 %, Mn: 2 % or less, Cr: 4 - 8 %, N: 0.05 % or less, and Fe and inevitable impurities: balance, as well as at least one selected from the group consisting of (i) W and/or Co: 0.1 - 2 %, (ii) a rare earth element and/or Y: 0.1 % or less, (iii) Mg and/or Ca: 0.005 - 0.03 %, and (iv) B: 0.001 - 0.01 %. |
