Hardened microalloyed bainitic steel useful for the production of e.g. automobile parts, comprises carbon, silicon, manganese, sulfur, copper, nickel, chromium, molybdenum, vanadium, iron and incidental impurities

摘要

Hardened microalloyed bainitic steel comprises 0.06-0.18 wt.% of carbon (C), 0.01-0.60 wt.% of silicon (Si), 0.10-3 wt.% of manganese (Mn), 0.001-0.030 wt.% of sulfur (S), 0.001 -0.40 wt.% of copper (Cu), 0.001-0.40 wt.% of nickel (Ni), 0.10-2 wt.% of chromium (Cr), 0.01-1 wt.% of molybdenum (Mo), 0.20-0.45 wt.% of vanadium (V) and balance of iron (Fe) and incidental impurities. Hardened microalloyed bainitic steel comprises 0.06-0.18 wt.% of carbon (C), 0.01-0.60 wt.% of silicon (Si), 0.10-3 wt.% of manganese (Mn), 0.001-0.030 wt.% of sulfur (S), 0.001 -0.40 wt.% of copper (Cu), 0.001-0.40 wt.% of nickel (Ni), 0.10-2 wt.% of chromium (Cr), 0.01-1 wt.% of molybdenum (Mo), 0.20-0.45 wt.% of vanadium (V) and balance of iron (Fe) and incidental impurities. A value of expression of 15x [C]-[Mo]-2x V (1) is = 1.4. A value of expression of 4x [C]+[Si]+4x [Mn]+[Cu]+[Ni]+5x [Cr]+4x [Mo]+5x [V] (2) is = 16.5. A value of expression of 3x [C]+10x [Mn]+2x [Cu]+2x [Ni]+12x [Cr]+9x [Mo]+2x [V] (3) is 20-35.