Ferritic steel alloy
AssigneeFirth AG
InventorKarl-Heinz Kramer
Life of this patent
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Abstract
Steel alloys include no more than 1.00 percent by weight of silicon, 18.0 to 22.0 percent by weight of chromium, 1.80 to 2.50 percent by weight of molybdenum, 0.01 to 0.10 percent by weight of nitrogen, no more than 0.01 percent by weight of titanium, no more than 0.01 percent by weight of niobium, no more than 0.01 percent by weight of aluminum, the remainder being essentially iron. The alloys are ferritic but polishable and have mechanical properties that nearly match those of the standard steel alloy no. 1.4521. The steel alloys are processed into watch parts such as housing bottoms, housing shells, and faces, among others, such that watch housings produced from the alloys magnetically shield the clockwork.
Claims13
A high-alloy ferritic steel alloy, comprising, based on the alloy, at the most 1.00 percent by weight silicon, 18.0 to 22.0 percent by weight chromium, 1.80 to 2.50 percent by weight molybdenum, 0.01 to 0.10 percent by weight nitrogen, at the most 0.01 percent by weight titanium, at the most 0.01 percent by weight niobium, at the most 0.01 percent by weight aluminum and as the remainder substantially iron.
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