A hardness of 58 HRC (Rockwell Hardness Scale) can be considered good for a sword, depending on the specific type of steel used, the intended use of the sword, and personal preferences. Here are some considerations regarding the hardness level of a sword:

1. Balance between Hardness and Toughness: The hardness of a sword blade is a trade-off between hardness and toughness. A harder blade typically offers better edge retention and resistance to deformation, while a softer blade provides more resilience and resistance to chipping or breaking. A hardness of 58 HRC strikes a balance between these factors.
2. Steel Type and Heat Treatment: Different types of steel have varying optimal hardness ranges. Some high-carbon steels used in sword making, such as 1095 or 1060, can achieve a hardness of around 58 HRC. However, it's important to note that the heat treatment process significantly affects the performance and durability of the blade. Proper heat treatment is crucial to maximize the potential of the chosen steel.
3. Intended Use and Personal Preference: The desired hardness for a sword depends on its intended use. A harder blade may be preferred for cutting and edge retention, while a slightly softer blade may be favored for more resilient applications or historical accuracy. Personal preference also plays a role, as some individuals may prefer a slightly softer or harder blade depending on their specific needs and style of use.

It's worth noting that hardness is just one aspect of a well-crafted sword. Other factors, such as the quality of the steel, heat treatment, forging techniques, and overall craftsmanship, also contribute to the sword's performance, durability, and balance.

Ultimately, the suitability of a 58 HRC hardness level for a sword depends on the specific steel, the intended use, and personal preferences. It is recommended to consult with experienced swordsmiths or experts who can provide guidance based on the specific requirements and intended use of the sword.