Patent ID: 7981360
Filing Date: 2011-07-19
Classification: C22C

Abstract:
1. A chromium-molybdenum-vanadium (Cr—Mo—V) cast steel comprising carbon in 0.08 to 0.12% by weight, sulphur in 0.015% by weight or less, phosphorous in 0.02% by weight or less, silicon in 0.30 to 0.60% by weight, manganese in 0.50 to 0.80% by weight, chromium in 1.20 to 1.50% by weight, molybdenum in 0.90 to 1.10% by weight, vanadium in 0.20 to 0.30% by weight, 0.06 to 0.08% by weight of niobium, and the balance iron and inevitable impurities; wherein the cast steel exhibits high creep rupture properties as defined by the Larson Miller Parameter vs. stress plots in