High-strength steel having a high minimum yield limit and method for producing a steel of this type

摘要

A high-strength steel having a minimum yield strength of 1300 MPa may include 0.23% to 0.25% by weight carbon, 0.15% to 0.35% by weight silicon, 0.85% to 1.00% by weight manganese, 0.07% to 0.10% by weight aluminium, 0.65% to 0.75% by weight chromium, 0.02% to 0.03% by weight niobium, 0.55% to 0.65% by weight molybdenum, 0.035% to 0.05% by weight vanadium, 1.10% to 1.30% by weight nickel, 0.0020% to 0.0035% by weight boron, and 0.0007% to 0.0030% by weight calcium. The high-strength steel may also include iron, unavoidable impurities, and at least one of the following: at most 0.012% by weight phosphorus, at most 0.003% by weight sulfur, at most 0.10% by weight copper, at most 0.006% by weight nitrogen, at most 0.008% by weight titanium, at most 0.03% by weight tin, at most 2.00 ppm hydrogen, at most 0.01% by weight arsenic, or at most 0.01% by weight cobalt. A method for producing such high-strength steel is also disclosed.