National Steel Corporation

William D Bingle

Lowell W Austin

John R Smith

William T Saunders

Drawn and ironed can bodies are formed from cold rolled steel sheet having a thin coating of a nickel-zinc alloy electroplated thereon by drawing the coated steel into a cup and ironing the sidewall of the cup on a mandrel by passing it through a toolpack comprising a plurality of ironing rings each including a generally conical lead-in surface having an angle relative to the axis of the mandrel within the range of 6.degree. to 81/2.degree. and a substantially cylindrical land extending no more than about 0.025 inches in the axial direction of the toolpack through the rings. The diameter of the land on successive ironing rings is progressively smaller in the direction of movement of the can through the toolpack, with the diameter of the final ironing ring being such as to reduce the sidewall of the cup to about one half its original thickness. The length of the land of the final ironing ring may be less than that of the previous ironing rings and preferably is within the range of 0.003 to 0.007 inches.

Method of forming D&I cans from coated steel

An improved sheet steel suitable for the production of containers and the like has a thin composite coating of nickel and zinc plated on both sides thereof. The steel substrate may be flat rolled blackplate and the composite nickel-zinc coating may be plated thereon by drawing a running length or strip of the steel through a nickel electroplating bath to which has been added the necessary concentration of zinc, and electrodepositing the two coating metals simultaneously and in the desired proportions. The coated steel sheet is particularly useful in forming drawn and ironed cans although it may be used for other purposes.

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Rochester, PA, United States of America

William D Bingle