CARBON FIBER BUNDLE AND METHOD FOR MANUFACTURING CARBON FIBER BUNDLE

To provide a carbon fiber bundle that can exhibit high strength without reducing the elastic modulus despite increasing the diameter of single fiber, and to provide a method for producing carbon fiber bundle.SOLUTION: Provided is a carbon fiber bundle, which is a carbon fiber bundle in which multiple carbon fiber single fibers are bundled together, and in which the single fiber has a diameter of 6.5 μm or more and 8.5 μm or less, a strand strength of 4.5 GPa or more, and a strand elastic modulus of 310 GPa or more, or a carbon fiber bundle in which multiple carbon fiber single fibers are bundled together, and in which the single fiber has a diameter of 6.5 μm or more and 8.5 μm or less, a strand strength of 4.5 GPa or more, and a product of the diameter of the single fiber and the strand strength of 31 or more.SELECTED DRAWING: None 【課題】単繊維の直径を太くしたにもかかわらず、弾性率を低下させることなく、高い強度を発現できる炭素繊維束及び炭素繊維束の製造方法の提供。【解決手段】複数本の炭素繊維の単繊維が集束されている炭素繊維束であって、前記単繊維の直径が６．５μｍ以上８．５μｍ以下であり、ストランド強度が４．５ＧＰａ以上であり、ストランド弾性率が３１０ＧＰａ以上である炭素繊維束、又は、複数本の炭素繊維の単繊維が集束されている炭素繊維束であって、前記単繊維の直径が６．５μｍ以上８．５μｍ以下であり、ストランド強度が４．５ＧＰａ以上であり、前記単繊維の直径と前記ストランド強度の積が３１以上である炭素繊維束。【選択図】なし