Development of high manganese non-magnetic steel for SSC dipole superconducting magnet collar

The SSC dipole magnet collar requires the material that is of high strength and sufficient stability in magnetism along with adequate thermal contraction at liquid helium temperature as well as at room temperature. The newly developed high Mn non-magnetic steel is shown to meet such requirements better than other materials like stainless steel. The new steel is featurized by a marked magnetic stability, temper cold rolling without any rise in magnetic permeability, and a little smaller thermal expansivity. High Mn steel demonstrates a satisfactory stampability and spot weldability similar to those of stainless steel. It is subjected to the fabrication of both short and long model magnets as collar material of a cold mass to exhibit favored results in their fabricability and magnet performance. 7 refs., 13 figs., 4 tabs