| 摘要 |
A magnet structure for dental magnetic attachment, characterized by comprising a ferritic stainless steel cup-type yoke containing essentially no Ni, a permanent magnet accommodated in a recessed part of the cup-type yoke, a seal member for sealing an opening of the cup-type yoke, and a weld for fixing abutting parts of the seal member and the cup-type yoke, the seal member comprising a ferritic stainless steel center part containing essentially no Ni, an austenitic stainless steel middle part containing essentially no Ni and having a nitrogen content of 0.5-2.0% by mass, and a ferritic stainless steel outer edge part containing essentially no Ni and having a nitrogen content less than that of the middle part and no greater than 1.3% by mass. |
