Production Processes for Extruding,Drawing,and Heat Treating Thin Steel Tee Sections.

摘要

A production manufacturing process for the extrusion of 0.062-inch-thick by 20-foot-long tee shapes in AISI 4340,PH 14-8Mo,and 18% Ni maraging steel was provided using a 1,200-ton Hydropress. The extrusion procedures,glass lubrication,temperature,and post-extrusion thermal and mechanical property tests are described. Other Phase I activity included the development of a fast,inexpensive test method to select extrusion glass lubricants. A reproducible drawing process was refined in Phase II to reduce the thickness of the 20-foot-long tee extrusions to a target thickness of 0.040inch. A process to heat treat 20-foot-long by 0.040-inch-thick extruded and drawn AISI 4340,PH 14-8Mo,and 18% maraging steel tee shapes was in Phase III. The heat treat response of the three alloys is adequate and exceeds the target mechanical properties for AISI 4340and PH 14-8Mo.