TITANIUM MATERIAL FOR SUPERCONDUCTING COIL CONDUCTOR CONDUIT.

摘要

Titanium is very excellent as the material of a conduit for use in liquid helium sealing of a high magnetic field superconducting coil, because it is reduced in the deterioration of the characteristics of a superconducting wire in virtue of the thermal shrinkage rate thereof close to that of Nb3Sn as a superconducting wire and also is excellent in the balance between the strength and the toughness at a liquid helium temperature. The invention provides a titanium material for superconducting coil conductor conduits which comprises 0.07-0.13 % (by mass, the same applies hereinbelow) of oxygen, 0.10 % or less of iron, 0.10 % or less of carbon and nitrogen in total, 0.005 % or less of hydrogen and the balance composed of titanium and unavoidable impurities and which satisfies the mechanical properties and fracture toughness required of a conduit material both as a base metal and a weld, by appropriately controlling the oxygen content of a pure titanium material, which content greatly affects the strength and toughness, and the content of other impurities.