Carbon fiber bundle and method for producing carbon fiber bundle

Abstract

Provided a carbon fiber bundle in which the average diameter of carbon fiber single-fibers is increased without reducing the strand strength and strand elastic modulus of the carbon fibers, and a method for producing the same. Also provided is a carbon fiber suitable for a carbon fiber composite material having excellent compressive strength in the fiber axial direction. The carbon fiber bundle of the present invention has a strand strength of 4.5 GPa or more, a strand elastic modulus of 320 GPa or more, substantially no twist, and an average diameter of carbon fiber single-fibers of 6.5 μm or more and 8.5 μm or less.

Dependencies are inferred from the claim text.