Steel composition

Abstract

The present invention relates to a steel composition carburizable and/or nitritable, comprising, in percentages by weight of the total composition: Carbon: 0.05-0.40, preferably 0.10-0.30; Chromium: 2.50-5.00, preferably 3.00-4.50; Molybdenum: 4.00-6.00; Tungsten: 0.01-1.80, preferably 0.02-1.50; Vanadium: 1.00-3.00, preferably 1.50-2.50; Nickel: 2.00-4.00; Cobalt: 2.00-8.00, preferably 3.00-7.00; Iron: balance as well as the inevitable impurities, optionally further comprising one or more of the following elements: Niobium: ≤2.00; Nitrogen: ≤0.50, preferably ≤0.20; Silicon: ≤0.70, preferably 0.05-0.50; Manganese: ≤0.70, preferably 0.05-0.50; Aluminum: ≤0.15, preferably ≤0.10; the combined niobium+vanadium content being in the range 1.00-3.50; and the carbon+nitrogen content being in the range 0.05-0.50. It further relates to the method of production thereof, the steel blank obtained and a mechanical device comprising the latter.

Dependencies are inferred from the claim text.