Method of making a reinforcement for vehicle doors

Details Method of making a reinforcement for vehicle doors Method of making a reinforcement for vehicle doors

1978-11-14

1980-07-01

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

C21D 908, C21D 714

Patent

active

042104670

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.

REFERENCES:
patent: 3328988 (1967-07-01), Schmidt
patent: 3573999 (1971-04-01), Gokyu

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