Process for manufacturing drawn can for aerosol and drawn can for aerosol

Abstract

A laminated steel sheet used as a raw material has a tensile strength TS after forming at an equivalent strain εeq of 1.6 is 800 MPa or less and satisfies 0.25≦tb/to where tb is a sheet thickness at a fracture surface after fracture and to is a sheet thickness before the fracture. In forming the laminated steel sheets, forming is conducted so as to satisfy the relationships below: 1.5≦ h /( R−r ), 2.8≦ R/r 1 , and 1.1≦r 2 /r 1 where h: a height from a can bottom to an opening edge portion; r: an outer diameter of a can body; R: a radius of a circular blank before forming having a weight equivalent to a weight of a final formed can body; r 1 : an outer radius of an opening edge portion; and r 2 : an outer radius of a bead portion.

1 - 7 . (canceled) 
   
   
       8 . A method for making an aerosol drawn can, satisfying relationships below and using, as a raw material, a laminated steel sheet coated with an organic resin film,
 wherein   the laminated steel sheet has a tensile strength TS of 800 MPa or less after forming at an equivalent strain εeq of 1.6 and satisfies 0.25≦tb/to where tb is a sheet thickness at a fracture surface after fracture and to is a sheet thickness before the fracture:
   1.5 ≦h /( R−r ) 
   2.8 ≦R/r   1    
   1.1 ≦r   2   /r   1    
   where   h: a height from a can bottom to an opening edge portion;   r: an outer diameter of a can body;   R: a radius of a circular blank before forming having a weight equivalent to a weight of a final formed can body;   r 1 : an outer radius of an opening edge portion; and   r 2 : an outer radius of a bead portion.   
   
   
       9 . The method for making the aerosol drawn can according to  claim 8 , wherein the laminated steel sheet contains, in terms of percent by mass, C: 0.0005 to 0.09%, Si: 0.1% or less, Mn: 1.0% or less, P: 0.02% or less, S: 0.02% or less, Al: 0.01 to 0.1%, N: 0.0060% or less, and the balance being Fe and inevitable impurities. 
   
   
       10 . The method for making the aerosol drawn can according to  claim 9 , wherein the laminated steel sheet further contains, in terms of percent by mass, B: 0.0001% to 0.003%. 
   
   
       11 . The method for making the aerosol drawn can according to  claim 9 , wherein the laminated steel sheet further contains, in terms of percent by mass, at least one of Ti: 0.001% to 0.05% and Nb: 0.001% to 0.05%. 
   
   
       12 . The method for making the aerosol drawn can according to  claim 10 , wherein the laminated steel sheet further contains, in terms of percent by mass, at least one of Ti: 0.001% to 0.05% and Nb: 0.001% to 0.05%. 
   
   
       13 . The method for making the aerosol drawn can according to  claim 8 , wherein the tensile strength TS after forming at an equivalent strain εeq of 1.6 is 600 to 800 MPa and 0.25≦tb/to ≦0.40 is satisfied where tb is a sheet thickness at a fracture surface after fracture and to is a sheet thickness before the fracture. 
   
   
       14 . An aerosol drawn can made by any one of the methods according to  claims 8 . 
   
   
       15 . An aerosol drawn can made by any one of the methods according to  claims 9 . 
   
   
       16 . An aerosol drawn can made by any one of the methods according to  claims 10 . 
   
   
       17 . An aerosol drawn can made by any one of the methods according to  claims 11 . 
   
   
       18 . An aerosol drawn can made by any one of the methods according to  claims 12 . 
   
   
       19 . An aerosol drawn can made by any one of the methods according to  claims 13 .