US 6,630,103 B2 · Ultra-high-strength precipitation-hardenable stainless steel and strip made therefrom

Abstract

A precipitation hardenable stainless steel having the following weight percent composition is disclosed. C 0.030 max. Mn 0.5 max. Si 0.5 max. P 0.040 max. S 0.025 max. Cr 9-13 Ni 7-9 Mo 3-6 Cu 0.75 max. Co 5-11 Ti 1.0 max. Al 1.0-1.5 Nb 1.0 max. B 0.010 max. N 0.030 max. O 0.020 max. The balance of the alloy is essentially iron and the usual impurities. One or more rare earth metals or calcium may be included in the alloy for removing and/or stabilizing phosphorus and sulfur. The alloy provides a unique combination of strength, toughness, and ductility. In accordance with another aspect of the present invention, there is described a useful article such as an aircraft structural component or a golf club head that is formed, at least in part, from the aforesaid alloy. In accordance with a further aspect of the present invention, there is described an elongated strip formed from the aforesaid and a method of making such strip material.

Claims32

Dependent claims

A precipitation-hardenable, martensitic stainless steel alloy having a unique combination of strength, toughness and corrosion resistance, said alloy consisting essentially of, in weight percent, about

C 0.030 max. Mn 0.5 max. Si 0.5 max. P 0.040 max. S 0.025 max. Cr 9-13 Ni 7-9 Mo 3-6 Cu 0.75 max. Co 5-11 Ti 1.0 max. Al 1.0-1.5 Nb 1.0 max. B 0.010 max. N 0.030 max. O 0.020 max.
and the balance is essentially iron.

Dependencies are inferred from the claim text.

Ultra-high-strength precipitation-hardenable stainless steel and strip made therefrom

Life of this patent

Ultra-high-strength precipitation-hardenable stainless steel and strip made therefrom

Life of this patent

Abstract

Claims32