Nippon Steel Corporation

Shoichi Matsuda

Masato Murakami

Mitsuru Morita

Katsuyoshi Miyamoto

Tsutomu Sasaki

Makoto Koike

Masazumi Hirai

Shigeru Minamino

Hiroyuki Honma

Tsunehiro Shimizu

Ikuo Itoh

Masana Imagunbai

Fukuyoshi Yamaguchi

The present invention is characterized in that oxides of Y, Ba and Cu having a superconductive substance-forming composition are melted, the melt is rapidly cooled and solidified, the obtained sheet is heated at a temperature of 1000.degree. to 1350.degree. C. to produce a partially melted state thereof, and the sheet is gradually cooled at a rate lower than 200.degree. C./hr, whereby a micro-structure in which precipitates of the RE.sub.2 BaCuO.sub.5 phase having a diameter smaller than 20 .mu.m are dispersed in the REBa.sub.2 Cu.sub.3 O.sub.7-y crystal is obtained.

REBa.sub.2 Cu.sub.3 O.sub.7-y type oxide superconductive material having

The present invention is characterized by a superconducting magnetic shield comprising a seamless, bottomless hollow body or a seamless hollow body having a bottom, the hollow body having a wall comprised of, in the thickness direction thereof, at least one laminate structure comprising a unit of two layers of an Nb--Ti-base alloy layer and a metal layer having a high conductivity or three layers of the above two layers and a barrier layer sandwiched therebetween; a process for preparing a magnetic shield which comprises subjecting the magnetic shielding material to a heat treatment after deep drawing; and a process for preparing the magnetic shielding material.

Superconducting magnetic shield and process for preparing the same

YBa.sub.2 Cu.sub.3 O.sub.7-y type oxide superconductive material

Production of steel materials which show excellent HAZ qualities when used for welded structures and contain

Steel materials for welded structures

Growing community of inventors

Kawasaki, Japan

Shoichi Matsuda