No, 1045 carbon steel is not considered a high-carbon steel. It is classified as a medium-carbon steel due to its carbon content, which typically ranges from 0.42% to 0.50%.

The carbon content of a steel determines its hardness, strength, and other mechanical properties. High-carbon steels typically have a carbon content above 0.60%, while low-carbon steels have a carbon content below 0.30%. Medium-carbon steels like 1045 fall within the middle range.

1045 steel is valued for its balance of properties. It offers good strength, toughness, and wear resistance, making it suitable for a variety of applications, including machinery parts, gears, axles, and some knife blades. It is also commonly used in sword production, particularly for functional, entry-level swords.

While 1045 steel is not as hard as higher carbon steels such as 1095, it can still be hardened and tempered to achieve a decent level of hardness for cutting purposes. The heat treatment process, including quenching and tempering, plays a crucial role in determining the final hardness and performance of the steel.

Overall, 1045 carbon steel is considered a reliable and versatile material, particularly in applications where a combination of strength, toughness, and moderate hardness is desired.