US 11,905,569 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 Jun. 8, 2020, as Appl. No. 16/895,061.
Application 16/895,061 is a division of application No. 14/971,233, filed on Dec. 16, 2015, granted, now 10,676,801.
Claims priority of provisional application 62/092,359, filed on Dec. 16, 2014.
Prior Publication US 2020/0299795 A1, Sep. 24, 2020
Int. Cl. C22C 38/06 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); F42B 5/32 (2006.01); F42B 5/28 (2006.01); C21D 9/16 (2006.01); C22C 38/58 (2006.01); C22C 38/44 (2006.01); C22C 38/42 (2006.01); C21D 8/02 (2006.01); C21D 6/00 (2006.01); C23C 2/06 (2006.01); F42B 33/00 (2006.01); C23C 2/26 (2006.01); C23C 2/02 (2006.01)
CPC C21D 9/16 (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)] 1 Claim
OG exemplary drawing
 
1. A rimfire ammunition cartridge, comprising:
a steel composition, consisting of:
from 0.05 to 0.13 weight percent carbon;
from 0.15 to 0.50 weight percent silicon;
from 0.70 to 2.50 weight percent manganese;
0.025 weight percent phosphorus;
0.025 weight percent sulfur;
from 0.02 to 0.08 weight percent aluminum;
less than 0.22 weight percent of one or more metal elements selected from the group consisting of cobalt, niobium, chromium, copper, molybdenum, nickel, titanium, vanadium, zirconium and mixtures and alloys thereof; and
a balance of iron, based on total weight percent of the steel composition,
wherein the rimfire ammunition cartridge composed of the steel composition is structured to have a tensile strength from 80 to 100 KSI, a yield strength is from 40 to 50 KSI, and an elongation from 20 to 30 percent.