CHROMIUM STEEL FOR MACHINE PARTS SUBJECT TO STRONG WEAR, IN PARTICULAR PELLETIZATION MATRICES

摘要

Chromium steel comprised of an alloy in wt% of: 0.42% to 0.7% carbon (C), optionally up to 1.0 wt% silicon (Si), optionally up to 2.0% manganese (Mn), 12% to 15% chromium (Cr), optionally up to 0.5% nickel (Ni), optionally up to 0.25% molybdenum (Mo), 0.08% to 0.20% nitrogen (N), optionally up to 0.05% aluminium (Al), optionally up to 0.05% niobium (Nb), optionally up to 0.05% titanium (Ti), optionally up to 0.10% vanadium (V), 0.015% to 0.050% sulfur (S), the remainder iron (Fe) and smelting-induced impurities; as well as a chromium steel blank in the form of a ring, in particular a blank for a matrix ring for pellet presses, having an outer diameter of at least 20 cm, wherein the chromium steel is annealed and temperable; and a matrix ring for pellet presses composed of martensitic chromium steel of said composition.