Corrosion-resistant, cold-formable, machinable, high...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/22 (2006.01) C22C 38/04 (2006.01) C22C 38/20 (2006.01) C22C 38/38 (2006.01)

Patent

CA 2615682

A corrosion resistant, martensitic steel alloy having very good cold formability is described. The alloy has the following weight percent composition. Carbon 0.10-0.40 Manganese 0.01 -2.0 Silicon 2.0 max. Phosphorus 0.2 max. Sulfur 0.030 max. Chromium 10-15 Nickel 0.5 max. Molybdenum 0.75-4.0 Nitrogen 0.02-0.15 Copper 1 .5-4.0 Titanium 0.01 max. Aluminum 0.01 max. Niobium + 0.10 max. Tantalum Vanadium 0.20 max. Zirconium less than 0.001 Calcium less than 0.001 The balance of the alloy is essentially iron. Nickel and copper are balanced in the alloy such that the ratio Ni/Cu is less than 0.2. A second embodiment of the alloy contains at least about 0.005% sulfur, selenium, or a combination thereof to provide good machinability.

La présente invention concerne un alliage d'acier martensitique résistant à la corrosion et ayant de très bonnes propriétés de façonnage à froid. La composition de l'alliage en pourcentages en poids est la suivante : carbone 0,10 à 0,40, manganèse 0,01 à 2,0, silicium 2,0 max., phosphore 0,2 max., soufre 0,030 max., chrome 10 à 15, nickel 0,5 max., molybdène 0,75 à 4,0, azote 0,02 à 0,15, cuivre 1,5 à 4,0, titane 0,01 max., aluminium 0,01 max., niobium + 0,10 max., tantale vanadium 0,20 max., zirconium moins de 0,001, calcium moins de 0,001. Le reste de l'alliage comprend essentiellement du fer. Le nickel et le cuivre sont présents dans l'alliage en quantités telles que le rapport Ni/Cu est inférieur à 0,2. Dans un second mode de réalisation, l'alliage contient au moins 0,005 % environ de soufre, de sélénium ou d'une combinaison des deux pour assurer de bonnes propriétés d'usinage.

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