Patent ID: 8074483

Claim:
A method of forming a two-piece can with a laminated steel sheet as a base material comprising: a) forming a circular blank by blanking the laminated steel sheet; b) forming a can body in a shape of a cylinder having an integrated bottom by applying repeated cycles of drawing to the circular blank; c) forming a dome protruding inside of the can at a can bottom; d) trimming an opening of the can body; e) applying diametral reduction to the opening after trimming to a diameter smaller than the diameter of the can body, while satisfying the formulae (1) and (2); f) forming a bead at the opening of the can body to obtain the two-piece can; and g) applying heat treatment to the laminated steel sheetduring at least one of steps a)-f), wherein the heat treatment includes heating the laminated steel sheet to a temperature in a range from a glass transition point of a film of the laminated steel sheet to a melting point thereof +30° C., followed by applying rapid cooling to the laminated steel sheet to a temperature of the glass transition point or below within 30 seconds after heating, 1.5≦ h /( R−r ) (1) d/R≦ 0.25 (2) where h is height from the can bottom to a tip of the opening, R is a circular blank positioning radius, r is the radius of the can bottom, and d is the radius of the tip of the opening.