Patent ID: 8097207
Filing Date: 2012-01-17
Classification: C21D,C22C

Abstract:
1. Method for reducing the disadvantageous effect of the segregated seams of a steel which has high mechanical strength and high wear resistance and whose composition consists of, in % by weight: optionally one or more elements selected from vanadium, niobium and tantalum at contents such that V≦1.45%, Nb≦1.45%, Ta≦1.45% and V+Nb/2+Ta/4≦1.45%, optionally up to 0.1% of boron, less than 0.005% of sulphur, optionally up to 0.01% of calcium, optionally up to 0.5% of rare earths, optionally up to 1% of aluminum, optionally up to 1% of copper, the balance being iron and impurities resulting from the production operation, the composition further complying with: with: according to which method: the molybdenum is completely or partially replaced with double the proportion of tungsten so that the content of tungsten is greater than or equal to 0.21%, the contents of titanium and/or zirconium are added such that, if C′ is the content of carbon after adjustment and C is the content of carbon before adjustment: the precision for carrying out those analytical adjustments at the steel works being such that: with: