Journal of Low Temperature Physics, Vol. 117. Nos. 5/6, 1999 *National Research Institute for Metals, Tsukuba 305-0047, Japan "CREST, Japan Science and Technology Corporation, Tsukuba 305-0047, Japan ***Showa Electric Wire & Cable Co. Ltd., Kawasak 210-0843i, Japan The high transport critical current density (J c ) > 500 kA/cm 2 at 4.2 K, 10 T is obtained in the Bi-2212/Ag multilayer tapes fabricated by using PAIR (Pre-Annealing and Intermediate Rolling) and melt-solidification process. This J c value is twice higher than existing high-quality Bi-2212/Ag tapes (250 kA/cm 2 ). By applying PAIR process to Bi-2212/Ag tapes, Bi-2212 grain alignment is much improved and a large J c enhancement is achieved. J c has been increased strongly by performing pre-annealing at 840°C in oxygen (1 atm) and intermediate rolling with 25% deformation. PACS numbers: 74.72.Hs, 85.25.Kx Bi-Sr-Ca-Cu-O superconductors are expected for practical applications. Bi2Sr2Ca 2 O x (Bi-2212)/Ag tape is one of the promising materials for magnet applications at low temperatures due to its high critical current density (J c ) in high magnetic fields and simple fabricating process. One of the most effective techniques is the melt-solidification method, obtaining highly oriented Bi-2212 grains with oxide J c (critical current (I c )/cross section of the oxide part) values of order of 100 kA/cm 2 at 4.2 K in high magnetic fields above 20 T 1-3 In Bi-2212/Ag multifilamentary tapes fabricated by using powder-in-tube method and melt-solidification process, Improvement of J c and Grain Alignment of Bi-2212/Ag Multilayer Tapes by Pre-Annealing and Intermediate Rolling Process Hitoshi Kitaguchi*, Hanping Miao* , **, Hiroaki Kumakura*, Kazumasa Togano *,** , Takayo Hasegawa*** and Tsutomu Koizumi*** 1525 0022-2291/99/J200-1525S16.00/0 © 1999 Plenum Publishing Corporation 1. INTRODUCTION