Corrosion resistant, martensitic steel alloy

C - Chemistry – Metallurgy – 22 – C

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C22C 38/46 (2006.01) C21D 1/42 (2006.01) C22C 38/00 (2006.01) C22C 38/56 (2006.01)

Patent

CA 2175341

p martensitic steel alloy has a unique combination of hardness and corrosion resistance. Broadly stated, the alloy contains, in weight percent about: C 1.40-1.75, Mn 0.30-1.0, Si 0.80 max., P 0.020 max, S 0.015 max., Cr 13.5-18.0, Ni 0.15-0.65, Mo 0.40-1.50, V 1.0 max., N 0.02-0.08 and the balance essentially iron. The alloy is balanced within the stated weight percent ranges such that the ratio %Cr.%C is about 10.0-11.0 and the sum %Ni+%Mn is at least about 0.75. The alloy can be hardened to at least about 60 HRC from a wide range of solution treating temperatures and provides corrosion resistance that is similar to Type 440c alloy.

Un alliage d'acier martensifique possède une combinaison unique de dureté et de résistance à la corrosion. De façon générale, l'alliage contient en pourcentage en poids environ: C 1,40-1,75, Mn 0,30-1, Si 0,80 max., P 0,020 max., S 0,015 max., Cr 13,5-18, Ni 0,15-0,65, Mo 0,40-1,50, V 1 max., N 0,02-0,08, le reste de l'alliage étant constitué essentiellement par du fer. L'alliage est équilibré à l'intérieur des plages de pourcentages en poids énumérées de telle façon que le rapport de pourcentage de Cr:C est d'environ 10-11 et que la somme de pourcentage de Ni+Mn est au moins d'environ 0,75. L'alliage peut-être durci à au moins environ 60 HRC à partir d'une plage étendue de températures de traitement de solution et présente une résistance à la corrosion similaire à un alliage de type 440 C.

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