Method of making a reinforcement for vehicle doors

US4210467A · kind A · utility

Assignee

• Benteler-Werke AG · DE

Inventors

• Stefan Klatzer · Jessenitz Siedlung, DE
• Winfried Dickhoff · Paderborn, DE

Key dates

• Filing date: Nov 14, 1978
• Grant date: Jul 1, 1980
• Expiry date: Nov 14, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D8/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A tubular reinforcing element for the interior of vehicle doors is made from a steel tube having a carbon content of 0.14-0.18%, 0.15-0.30% silicon, 1.60-1.80% manganese, 1.90-2.10% chromium, 0.45-0.60% molybdenum and at least 0.015% aluminum. This tube is annealed at 900.degree.-930.degree. C. and then aircooled. Thereafter the portions of the tube which are to be deformed are heated to above the temperature of the alpha-gamma phase change (A.sub.3 on the iron-carbon equilibrium diagram), then deformed to the desired shape and aircooled. All percentages are by weight.