There are several types of steel that are commonly considered to be among the best for knives. Here are a few examples:

440C Steel: Once considered a high-end steel, 440C is a good all-round steel that has been overshadowed by newer super-steels. It offers good corrosion resistance, edge retention, and ease of sharpening.

14C28N Steel: This steel is often described as “the best budget steel” and offers similar performance to much more expensive steels. It provides good corrosion resistance, excellent hardness, and is known for its ability to take a razor-sharp edge.

CPM-S90V Steel: This steel is known for its exceptional edge retention and wear resistance. It is a high-performance stainless steel that offers excellent corrosion resistance and toughness.

Please note that the “best” steel for knives can vary depending on the specific needs and preferences of the user. Different steels have different properties and excel in different areas. It’s important to consider factors such as corrosion resistance, edge retention, ease of sharpening, and intended use when choosing the best steel for a knife.