PROBLEM TO BE SOLVED: To provide a method for manufacturing a Co-based alloy for a living body, by which a Co-based alloy can be forged into a shape near a finished shape.SOLUTION: The method for manufacturing a Co-based alloy for a living body, in which the alloy contains 26 to 30% of Cr, 5 to 8% of Mo, 0.20% or less of C and 0.05 to 0.25% of N, comprises: a first step of heating the alloy at 950 to 1,250°C, and then forging it at 850 to 1,050°C while applying a process strain of 30% or more, and also cooling it within 5 seconds after forging is finished, down to 300°C or lower at a cooling speed of 30 °C/s or more and a second step of heating the alloy at 850 to 1,050°C for 5 to 60 minutes, and then forging it at 850 to 1,000°C while applying a process strain of 15% or less, and also cooling it within 20 seconds after forging is finished, down to 300°C or lower at a cooling speed of 30 °C/s or more.COPYRIGHT: (C)2013,JPO&INPIT【課題】Co基合金を仕上がり形状に近い形状にまで鍛造することができる生体用Co基合金の製造方法を提供することを課題とする。【解決手段】Cr:26~30%、Mo:5~8%、C:0.20%以下、N:0.05~0.25%を含有する生体用Co基合金の製造方法であって、950℃~1250℃で加熱した後、850℃~1050℃で30%以上の加工歪みを加えて鍛造を行い、終了後5秒以内に30℃/s以上の冷却速度で300℃以下になるまで冷却を行う第1工程と、850~1050℃で5~60分間加熱した後、850~1000℃で15%以下の加工歪みを加えて鍛造を行い、終了後20秒以内に30℃/s以上の冷却速度で300℃以下になるまで冷却を行う第2工程とよりなる。【選択図】なし
