Refractory product for use in continuous casting, and refractory product member

A refractory product for continuous casting, containing a free carbon component in an amount of 10% by mass to 30% by mass, and a remainder in which:

• a main mineral phase is comprised of one or more selected from the group consisting of corundum, spinel, and periclase, wherein a content of the periclase is less than 40% by mass;
• and a total content of a silica component and a silicon carbide component is less than 15% by mass,
• wherein when a remainder after excluding a composition comprised of the free carbon component from a composition of the refractory product is defined as 100% by volume, refractory particles having a particle size of greater than 0.3 mm account for 20% by volume or more, and refractory particles having a particle size of 0.045 mm or less account for 3% by volume to 30% by volume,
• and wherein an approximately continuous void layer is present around each of a plurality of coarse particles, at least one of which has a largest particle size among refractory particles in the refractory product, the approximately continuous void layer having a similar shape to the coarse particle, wherein a total thickness of the approximately continuous void layer across two positions on an interface between a carbon-containing matrix microstructure and the coarse particle, located on opposed sides of the void layer is in the range of 0.3% to 3% of the particle size of the coarse particle,
• and wherein the refractory product has an apparent porosity of 16% or less, and a maximum thermal expansion rate at a temperature up to 1500° C. is 0.6% or less.