| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.29 ( November 1993 ) Special Issue on Iron Power ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Ultra-Thin-Gage and High-Strength Tin Mill Blackplates with Low Planar Anisotropy in r-Value for Two-Piece Cans Hideo Kuguminato, Hideo Abe, Takashi Ono, Akio Tosaka, Yoshio Izumiyama, Yoshihiro Ohkawa |
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Synopsis : The development of sheet steels is described for two-piece cans, drawn and redrawn (DRD) cans, and drawn and wall-ironed (DWI) cans which have an ultra-thin gage for high strength use, outstanding deep drawability expressed by a high r-value, and low planar anisotropy. Both good drawability ( value is higher than 1.1) and the non-earing property can be given to tin-free steels (TFS) with a temper grade of DR8 for DRD cans by using a low carbon content, controlling the coiling temperature during the hot rolling process at the appropriate level, and employing a relatively low cold rolling reductions in both the cold rolling processes before and after continuous annealing. The steels for the DWI can use with a temper grade of T4 have a high nitrogen content and are processed on the continuous annealing line. The good deep drawability (-value of higher than 1.3) and non-earing properties of the steels were achieved by adjusting the carbon content in an appropriate range and controlling the coiling temperature during the hot rolling process to a suitable level. These steels can be hardened by baking after cup forming due to strain aging caused by solute atoms. |
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