Patent Number: 8,871,040

Title: High ballistic strength martensitic armour steel alloy

Abstract: The invention relates to an air hardenable high-hardness steel for armoring applications, such as armor plate for use in light armored vehicles and body armor, and having a high level of ballistic performance relative to its plate thickness. In particular, the invention concerns a high ballistic strength martensitic armor steel which, in an air cooled and untempered condition, has a strength coefficient (s0) of higher than 2500 MPa; a flow parameter (P) of higher than 8.0, preferably higher than 18.0; and a manganese content of 1.8 to 3.6% by weight of manganese, preferably 2.8 to 3.1% by weight of manganese. The armor steel also includes retained austenite at a volume fraction of at least 1%, and preferably a volume fraction of 4 to 20%.

Inventors: Du Plessis; Deon Francoise (Krugersdorp, ZA), Wessels; Jacob Johannes (Secunda, ZA), Adams; Percy Phillip (Parkwood, ZA), Mostert; Roelof Johannes (Wierda Park, ZA), Stumpf; Waldo Edmund (Groenkloof, ZA)

Assignee: Damascus Armour Development (Pty) Ltd.

International Classification: C22C 38/04 (20060101); C22C 38/38 (20060101); C22C 38/58 (20060101); C21D 8/02 (20060101); C22C 38/44 (20060101); C21D 9/10 (20060101)

Expiration Date: 2018-10-28 0:00:00