Abstract A process for producing drinking cans made of an aluminum-plated steel sheet which comprises: forming an aluminum-plated steel sheet having a Rockwell HRB hardeness of 45 to 75; by hot dipping a steel sheet into a molten aluminum bath containing more than 3% silicon to form a plated layer on said steel sheet, wherein said plated layer consists of an alloy layer not more than 5 Mu thick and an aluminum layer not less than 5 Mu thick and wherein the total thickness of said aluminum layer and said alloy layer ranges from 8 Mu to 25 Mu ; drawing and ironing said aluminumplated steel sheet to form the cup portion of a two-piece drinking can, wherein said drawing initially is conducted at an ironing rate ranging from 0 to 15 percent and said ironing is conducted in three or four successive stages at ironing rates progressively lower than the ironing rate used initially for said first stage.
A process for producing drinking cans made of an aluminumplated steel sheet which comprises: forming an aluminum-plated steel sheet having a Rockwell HRB hardness of 45 to 75 by hot dipping a steel sheet into a molten aluminum bath to form a plated layer on said steel sheet, wherein said plated layer consists of an alloy layer not more than 5 Mu thick and an aluminum layer not less than 5 Mu thick and wherein the total thickness of said aluminum layer and said alloy layer ranges from 8 Mu to 25 Mu ; and drawing and ironing said aluminum-plated steel sheet to form the cup portion of a two-piece drinking can, wherein said drawing step is initially conducted at an ironing rate ranging from 0 to 15 percent, and said ironing step is conducted in at least first, second and third successive stages, the ironing rates for said second and third stages being progressively lower than the ironing rate of said first ironing stage.
Claim 2
Dependent Claim
165 words
A process for producing drinking cans made of an aluminumplated steel sheet which comprises: forming an aluminum-plated steel sheet having a Rockwell HRB hardness of 45 to 75 by hot dipping a steel sheet into a molten aluminum bath to form a plated layer on said steel sheet, wherein said plated layer consists of an alloy layer not more than 5 Mu thick and an aluminum layer not less than 5 Mu thick and wherein the total thickness of said aluminum layer and said alloy layer ranges from 8 Mu to 25 Mu ; and drawing and ironing said aluminum-plated steel sheet to form the cup portion of a two-piece drinking can, wherein said drawing step is initially conducted at an ironing rate ranging from 0 to 15 percent, and said ironing step is conducted in at least first, second and third successive stages, the ironing rates for said second and third stages being progressively lower than the ironing rate of said first ironing stage.
Claim 3
Dependent Claim
29 words
The process of claim 1, wherein said ironing step further includes a fourth successive stage having an ironing rate lower than the ironing rate used for said third stage.