Heat treating a metallic workpiece by quenching under cooling gas under above atmospheric pressure and specified circulation rate

US4867808A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Paul Heilmann · Maintal, DE
• Friedrich Preisser · Heitersheim, DE
• Rolf Schuster

Key dates

• Filing date: Oct 25, 1988
• Grant date: Sep 19, 1989
• Expiry date: Oct 25, 2008

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F27B2005/161
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for heat treatment of metallic workpieces by heating in a vacuum furnace followed by quenching in a coolant gas under above-atmospheric pressure and with coolant-gas circulation.