Hardened martensitic steel contains amounts of carbon, cobalt, chrome and aluminum with traces of

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Steel characterized in that its composition is, in percentages by weight : - C = 0, 18 - 0, 30% - Co = 5 - 7% - Cr = 2 - 5% - Al = 1 - 2% - Mo + W/2 = 1 - 4% - V = traces - 0, 3% - Nb = traces - 0, 1% - B = traces - 50 ppmNi = 10, 5 - 15% with Nor > = 7 + 3, 5 AlSi = traces - 0, 4% - mn = traces - 0, 4% - Ca = traces - 500 rare ppmTerres = traces - 500 ppmTi = traces - 500 ppmO = traces - 200ppm if steel is obtained by metallurgy of the powders, or traces - 50 ppm if the acierest obtained by development with the air or vacuum starting from metal liquideN = traces - 100 ppmS = traces - 50 ppmCu = traces - 1% - P = traces - 200 ppmle remains being inevitable iron and impurities resulting from the development. Manufactoring process of a part starting from this steel, and part thus obtained.