HRC is the Rockwell C hardness scale, the standard measure of how hard a knife blade has been heat treated. Most production knives fall between about 55 and 62 HRC, and the number is a trade-off between edge holding and toughness, not a quality score.
Higher HRC generally means better edge retention and worse toughness. A blade at 62 will hold an edge longer and is more likely to chip. A blade at 56 will need sharpening sooner and will bend rather than break.
The right number depends on the job. Chopping tools and machetes deliberately run softer, often in the low 50s, so they survive impact. Slicers and folders run harder.
The same alloy at the same hardness can perform very differently depending on how the heat treat was executed, and different alloys at the same hardness behave nothing alike. A well-treated 420HC at 58 can outperform a badly treated premium steel at 61.
Treat HRC as one data point alongside the alloy and the grind. A published hardness range is a sign the maker is confident enough to state it, which is itself useful.
Every steel we stock, with its published composition, hardness range and the trade it makes, is documented in the Steel Lab.