Back to results
US 12,331,372 B2Granted
Steel compositions, methods of manufacture and uses in producing rimfire cartridges
AssigneeGreer Steel Company
InventorsDouglas B. Campbell, Todd Daenzer
Life of this patent
Estimating the term…
Abstract
The present invention relates generally to steel compositions, methods of manufacturing the compositions and using the compositions to produce rimfire ammunition cartridges. The steel compositions for use in the rimfire cartridges are processed through cold-rolling and annealing steps to create suitable physical properties.
Claims7
A method of processing steel of a rimfire cartridge, the method comprising:
- obtaining a steel composition having an original thickness;
- performing a first cold rolling of the steel composition;
- producing the steel composition having a reduced thickness,
- wherein, the reduced thickness constitutes a reduction of about 30% to about 70% of the original thickness;
- performing a first annealing and subsequent cooling of the steel composition having the reduced thickness;
- performing a second cold rolling of the steel composition having the reduced thickness, following the first annealing and subsequent cooling step;
- producing the steel composition having an additional reduced thickness,
- wherein, the additional reduced thickness constitutes an additional reduction of about 20% to about 35%;
- performing a second annealing and subsequent cooling of the steel composition having the additional reduced thickness;
- and
- continuous plating one or more of:
- the steel composition having the reduced thickness, following the first annealing and subsequent cooling step;
- and
- the steel composition having the additional reduced thickness, following the second annealing and subsequent cooling step.
11 more elements
A method of forming a rimfire cartridge, comprising:
- obtaining a steel composition having an original thickness;
- performing a first cold rolling of the steel composition;
- producing the steel composition having a reduced thickness of about 30% to about 70% of the original thickness;
- performing a first annealing and subsequent cooling of the steel composition having the reduced thickness;
- performing a second cold rolling of the steel composition having the reduced thickness, following the first annealing and subsequent cooling step;
- producing the steel composition having a further reduced thickness of about 20% to about 35%;
- performing a second annealing and subsequent cooling of the steel composition having the further reduced thickness;
- continuous plating one or more of:
- the steel composition having the reduced thickness, following the first annealing and subsequent cooling step;
- and
- the steel composition having the further reduced thickness, following the second annealing and subsequent cooling step;
- and
- forming steel composition having the further reduced thickness into a rimfire cartridge.
10 more elements
Dependencies are inferred from the claim text.