| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.22 ( May 1990 ) Advanced Technologies of Iron and Steel, Commemorating the 20th Anniversary of the Technical Research Division ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Cryogenic Non-magnetic High Mn Steel for Accelerator Superconducting Magnet Kiyohiko Nohara, Yasuhiro Habu |
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Synopsis : A cryogenic non-magnetic steel has been developed which is used as a supporting material for a superconducting magnet in a particle accelerator system. This steel must satisfy the following requirements: (1) Its magnetic permeability at RT and 4K shall be less than 1.002 which is far below that of conventional non-magnetic steels, and its temperature/strain dependences shall be minimized, in order to keep the deviation of magnetic field to the order of 10-4, and (2) its yield strength at RT and 4K shall be much greater than that of conventional austenitic stainless steel to withstand the local prestress and electromagnetic force, and (3) lowering of its cryogenic ductility and toughness after precipitation heat treatment of Nb3Sn superconductor shall be lessened in order to apply it to a super conducting wire. To meet the above-mentioned requirements, low C-high Mn-N-V steel has been newly developed. The steel also shows good applicability to stamping and spot-welding operations. |
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