| 摘要 |
The invention relates to a steel alloy, which in hot-worked condition has a ferritic-pearlitic microstructure and austenite grain size coarser than ASTM 10 (coarser than 10 µm), and which has a chemical composition of: C 0,15...0,6 percent by weight Si 1,25...2,0 percent by weight Mn 0,5...1,6 percent by weight S 0...0,2 percent by weight Cr 0 ...1,5 percent by weight Mo 0,02...0,1 percent by weight Al 0 ...0,1 1 percent by weight V 0 ...0,2 percent by weight N 0 ...0,04 percent by weight Nb 0 ...0,1 percent by weight Ti 0 ...0,05 percent by weight. The invention relates additionally to methods for manufacturing ferritic-pearlitic hot forged products and hot-rolled steel bars having a high yield strength, high fatigue strength and good machinability. |
