Abstract: A method for continuous production of thin plate ingot of phosphor bronze by quenching molten metal of bronze, wherein molten metal of phosphor bronze is quenched at a rate of from 10.sup.2 .degree. C./sec. to 10.sup.5 .degree. C./sec. to thereby solidify the same, and then the solidified metal is continuously cooled to a normal temperature to thereby obtain a microstructure having a crystal grain size of 50 .mu.m or below and in which appearance of the dendritic structure and the segregation layer is suppressed.

Abstract: A superconductor comprises two superconducting wires butt-jointed, a superconducting doubling wire electrically and mechanically connecting the superconducting wires, and a stabilizer attached to the superconductors and the doubling wire to extend therealong, the superconductors, the doubling wire and the stabilizer together forming a superconductor of a constant cross-sectional area. A manufacturing process is also disclosed.

Abstract: A superconductive substance is produced by fabricating any one metal (17) of niobium and vanadium and an easily deformable metal (16) such as Cu into one piece and working it to produce a composite metallic wire, chemically dissolving and removing the easily deformable metal (16) from the composite metallic wire, and then depositing a tin or gallium-base metal (18) and applying heat treatment.Also, a process for producing a superconductive substance comprising fabricating any one metal of niobium and vanadium and an easily deformable metal such as Cu containing at least one metal of tin and gallium into one piece and working it to produce a composite metallic material, heat treating the composite metallic material to form a superconductive substance, and then chemically dissolving and removing the easily deformable metal as a non-conductive substance from the composite metallic material is disclosed.