US 12,331,372 B2
Steel compositions, methods of manufacture and uses in producing rimfire cartridges
Douglas B. Campbell, Waikoloa, HI (US); and Todd Daenzer, New Philadelphia, OH (US)
Assigned to GREER STEEL COMPANY, Dover, OH (US)
Filed by GREER STEEL COMPANY, Dover, OH (US)
Filed on Jan. 23, 2024, as Appl. No. 18/419,766.
Application 18/419,766 is a division of application No. 16/895,061, filed on Jun. 8, 2020, granted, now 11,905,569.
Application 16/895,061 is a division of application No. 14/971,233, filed on Dec. 16, 2015, granted, now 10,676,801, issued on Jun. 9, 2020.
Claims priority of provisional application 62/092,359, filed on Dec. 16, 2014.
Prior Publication US 2024/0158878 A1, May 16, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. C22C 38/00 (2006.01); B23K 3/08 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C21D 9/16 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/58 (2006.01); C23C 2/06 (2006.01); F42B 5/28 (2006.01); F42B 5/32 (2006.01); F42B 33/00 (2006.01)
CPC C21D 9/16 (2013.01) [B23K 3/08 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0236 (2013.01); C21D 8/0247 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/58 (2013.01); C23C 2/06 (2013.01); F42B 5/28 (2013.01); F42B 5/32 (2013.01); F42B 33/001 (2013.01)] 7 Claims
OG exemplary drawing
 
1. 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.