US 12,263,521 B2
Boron steel high-pressure cartridge case
Brian Swank, Delaware, OH (US)
Assigned to LUVATA OHIO, INC., Delaware, OH (US)
Filed by Luvata Ohio Inc., Delaware, OH (US)
Filed on Oct. 19, 2023, as Appl. No. 18/489,920.
Application 18/489,920 is a continuation of application No. 17/484,089, filed on Sep. 24, 2021, granted, now 11,826,818.
Claims priority of provisional application 63/083,833, filed on Sep. 25, 2020.
Prior Publication US 2024/0042512 A1, Feb. 8, 2024
Int. Cl. F42B 5/295 (2006.01); B21K 21/04 (2006.01); C21D 7/02 (2006.01); C21D 8/06 (2006.01); C21D 9/16 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); F42B 5/28 (2006.01)
CPC B21K 21/04 (2013.01) [C21D 7/02 (2013.01); C21D 8/065 (2013.01); C21D 9/16 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); F42B 5/28 (2013.01); F42B 5/295 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
cold forming a cartridge case into a drawn blank or a tubular component, wherein the cartridge case is fabricated of boron steel;
annealing the cartridge case using a belt furnace, flame furnace, induction furnace, or a batch furnace;
performing a machine ejector slot and trim on the cartridge case;
forming a shoulder and a neck of the cartridge case;
performing a heat treatment of the cartridge case;
tempering the cartridge case; and
coating the cartridge case with a corrosion resistant plating,
wherein after performing the heat treatment and before tempering the cartridge case, the method further comprises:
oil quenching the cartridge case.
 
12. A cartridge case, comprising:
a cartridge body having a tubular shape with an ejector slot, a shoulder, and a neck;
wherein the cartridge body is comprised of a boron steel comprising ≤1.0% boron, and the cartridge body is coated with a zinc nickel plating;
wherein the cartridge case is fabricated by:
cold forming the cartridge case into a drawn blank or a tubular component;
annealing the cartridge case using a belt furnace, flame furnace, induction furnace, or a batch furnace;
performing a machine ejector slot and trim on the cartridge case;
forming the shoulder and the neck of the cartridge case;
performing a heat treatment of the cartridge case;
tempering the cartridge case; and
coating the cartridge case with a zine nickel corrosion resistant plating,
wherein after performing the heat treatment and before tempering the cartridge case, the cartridge case is further fabricated by:
oil quenching the cartridge case.