Patent ID: 8853903

Claim:
A low alloy steel for generator rotor shafts, consisting essentially of, by mass percent, 0.15 to 0.35% carbon, 0.01 to 0.10% Si, 0.10 to 0.50% Mn, 1.3 to 2.0% Ni, 2.1 to 3.0% Cr, 0.20 to 0.50% Mo, 0.20 to 0.30% Cu, 0.06 to 0.14% V, an absence of tungsten, and the balance of Fe and unavoidable impurities, wherein the low alloy steel has not higher than 275 AT/m of magnetizing force and wherein the low alloy steel has a FATT of not higher than 7° C.