ArcelorMittal S.A.
Martensitic steels with 1700 to 2200 MPa tensile strength

Abstract:

A martensitic steel alloy is provided. The martensitic steel alloy includes carbon from 0.22 to 0.36 wt. %, manganese from 0.5% to 2.0% wt. %, and chromium in an amount less than 0.10 wt. %. and a carbon equivalent C.sub.eq of less than 0.44 in which C.sub.eq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15. C.sub.eq is the carbon equivalent, C, Mn, Cr, Mo, V, Ni, and Cu are in wt. % of the elements in the alloy. The alloy has an ultimate tensile strength of at least 1700 MPa.