	US 11,814,694 B2
	Method for producing a highly heat-resistant weapon barrel provided with a twist profile
Gert Schlenkert, Duesseldorf (DE); and Ulrich Keller, Unterluess (DE)
Assigned to Rheinmetall Waffe Munition GmbH, Unterluess (DE)
Filed by Rheinmetall Waffe Munition GmbH, Unterluess (DE)
Filed on Mar. 22, 2021, as Appl. No. 17/208,614.
Application 17/208,614 is a continuation of application No. PCT/EP2019/072857, filed on Aug. 27, 2019.
Claims priority of application No. 10 2018 123 278.0 (DE), filed on Sep. 21, 2018.
Prior Publication US 2021/0207233 A1, Jul. 8, 2021
Int. Cl. C01D 9/12 (2006.01); B21C 37/00 (2006.01); C21D 1/18 (2006.01); C21D 6/00 (2006.01); C22C 38/22 (2006.01); C21D 9/12 (2006.01); B21C 37/15 (2006.01); C22C 38/24 (2006.01)

CPC C21D 9/12 (2013.01) [B21C 37/153 (2013.01); C21D 1/18 (2013.01); C21D 6/00 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C21D 2261/00 (2013.01)]

6 Claims

1. A method for producing a highly heat-resistant barrel provided with a twist profile for small-caliber automatic weapons, the method comprising:

introducing the desired twist profile into a barrel blank made of heat-resistant steel by extrusion or hammering, the heat-resistant steel has a yield point ≤1000 MPa at room temperature when the twist profile is introduced;

quenching the barrel blank after the twist profile is introduced;

tempering the barrel blank via vacuum tempering to a predefined strength value with a yield point >1000 MPa; and

mechanically finishing the quenched and tempered barrel blank.