KAWASAKI STEEL GIHO
Vol.25 (1993) No.1
Ultra-Thin-Gauge and High-Strength Tin Mill Blackplates with Less Planar Anisotropy of -Value for Two-Piece Can Use
vX©@pY(Hideo Kuguminato)@¢@pv(Hideo Abe)@¬ì@i(Takashi Ono)@oâ@Íj(Akio Tosaka)@òR@õj(Yoshio Izumiyama)@åì@O(Yoshihiro Ohkawa)
c[s[XÊp|ÂÆµÄCxCÉÅ éÆÆàÉC[iè«iljÉDêC©ÂÊàÙû«Ì¬³¢cqcÊidrawn and redrawn canj¨æÑcvhÊidrawn and wall ironed canjp|ÂðJµ½BcqcÊpTFS(²¿xDR8)ÍCbÊðá¸µCbsÍ·Câ³º¦ÍPñÚCQñÚÆàá³¦é±ÆÉæè[iè«i l1.1ÈãjÆmCAO«ð¼§³¹½BÜ½CcvhÊp|Âi²¿xsSjÍA±ÄÝðp¢CÅnmÊð½c¶³¹CbÊðKØÈÍÍÉ²®µCbsð·Édã°é±ÆÉæèC[iè«irl1.3ÈãjÆmCAO«ð¼§³¹éÆÆàÉCÓ¸Ýø»ÛðpµC¬`ãÌMÅd¿»Å«éB
The authors have developed sheet steels for two-piece cans, drawn and redrawn (DRD) cans and drawn and wall ironed (DWI) cans which have ultra-thin gage for high strength use, excellent deep drawability expressed by high r-value, and less planar anisotropy. Both good drawability (mean r 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 the DRD can be using low carbon content, controlling the coiling temperature during the hot rolling process to be adequate, and employing lower cold rolling reductions in both cold rolling processes before and after continuous annealing. Steels for the DWI can use with a temper grade of T4 have high nitrogen content and are processed in the continuous annealing line. The good deep drawability expressed by the average r-value of more than 1.3 and non-earing properties of the steels are achieved by adjusting carbon content in a proper range and controlling the coiling temperature during the hot rolling process to be adequate. The steels can be hardened by baking after cup forming due to strain aging caused by solute atoms.