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US 8,505,457 B2Granted
Contoured thickness blank for ammunition cartridges
AssigneeAK Steel Properties, Inc.
InventorsDaniel Keith Scherrer, Joseph Alan Douthett
Life of this patent
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Abstract
An austenitic stainless steel ammunition cartridge includes an outer region and a base, wherein the outer region is about 50%-80% of the thickness of the base, which serves to minimize the sidewall ironing required to form the cartridge. The cartridge blank can be formed by spin forming, compression forming, grinding, or a combination thereof. Tooling to form the insert can include at least a pair of blocks and inserts, at least one insert defining a centrally positioned aperture.
Claims1
An ammunition cartridge case, comprising:
- (a) a base, the base having a first thickness;
- and
- (b) an outer region, the outer region having a second thickness, the first thickness greater than the second thickness by a percentage of at least 50%;
- wherein the cartridge case comprises austenitic stainless steel;
- and
- wherein the base and the outer region comprise a monolithic, single piece of austenitic stainless steel;
- and
- wherein the austenitic stainless steel comprises weight percentages of from about 17.2 to about 17.8 Cr, from about 3.1 to about 3.4 Cu, and from about 8.1 to about 8.4 Ni.
5 more elements
Dependencies are inferred from the claim text.