Patent ID: 7862667
Filing Date: 2011-01-04
Classification: C22C

Abstract:
1. A steel composition, comprising: carbon (C) between about 0.2 and 0.3 wt. %; manganese (Mn) between about 0.1 and 1 wt. %; silicon (Si) between about 0 and 0.5 wt. %; chromium (Cr) between about 0.4 and 1.5 wt. %; molybdenum (Mo) between about 0.1 and 1 wt. %; niobium (Nb) between about 0 and 0.1 wt. %; aluminum (Al) between about 0 and 0.1 wt. %; calcium (Ca) between about 0 and 0.01 wt. %; boron (B) less than about 100 ppm; titanium (Ti) between about 0 and 0.05 wt. %; tungsten (W) between about 0.1 and 1.5 wt. %; vanadium (V) between about 0 and no more than about 0.05 wt. %; copper (Cu) between about 0 and no more than about 0.15 wt. %; oxygen (O) less than about 200 ppm; nitrogen (N) less than about 0.01 wt. %; sulfur (S) less than about 0.003 wt. %; and phosphorus (P) less than about 0.015 wt. %; wherein the average packet size, d wherein the average packet size, d wherein the composition possesses precipitates having a particle diameter, d wherein the shape factor is calculated according to 4Aπ/P