High-carbon steel generally refers to steel with a carbon content greater than 0.6%. While heat treatment can achieve high hardness, it also results in increased brittleness.
High-strength steel has high comprehensive performance, not just high hardness. Generally, high-strength steel is alloy steel, which is steel with other metal elements added, such as manganese, chromium, nickel, etc., which can greatly improve the overall strength of the steel.

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