Gun Tube Extrusion

Abstract

Hollow, two diameter, thick walled cylinders were produced via the hot extrusion process by the Curtiss-Wright Corp., Buffalo, New York. The material was gun steel (4335V modified) produced by Electralloy Corp., Oil City, PA, in an argon-oxygen decarburization (AOD) vessel. The extrusions were heat treated to develop mechanical properties required for the 105mm M68 gun tube per the Specification MIL-S-46119. Mechanical properties (tension, charpy V-notch and fracture toughness specimens) were measured in the transverse and longitudinal directions along the length of three (3) extrusions. The macrostructure and microstructure were also examined. The mechanical properties were satisfactory; however, the charpy V-notch impact energy was marginal. The dimensions, straightness, and wall thickness variations were consistent and met the requirements. Although more material had to be removed, compared to conventional forgings, the total time for machining an extrusion would not be more than for conventional forgings because they are easier to straighten and set up than the normal tapered forgings.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1983
Accession Number
ADA131896

Entities

People

  • R. A. Farrara

Organizations

  • United States Army Armament Research, Development and Engineering Center

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aluminum Oxides
  • Crack Propagation
  • Dealloying
  • Diameters
  • Extrusion
  • Fabrication
  • Heat Treatment
  • Impact Strength
  • Machining
  • Materials
  • Mechanical Properties
  • Mechanics
  • Microstructure
  • New York
  • Specifications
  • Toughness
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Metallurgy
  • ballistics.