Rockwell Hardness Scale: The HRC Chart, Number by Number

HRC is a steel's hardness on the Rockwell C scale. Kitchen knives run about 52 to 66 HRC: 52–55 is soft and dulls fast, 56–58 is tough and easy to sharpen, 58–62 is the sweet spot, and 62 and above is specialist.

Pick up any spec sheet for a serious kitchen knife and you'll find a number followed by three letters: 60 HRC, 58 HRC, 62 HRC. That figure — the blade's rating on the Rockwell Hardness Scale — predicts how fine an edge the steel can take, how long it will hold it, and how the knife wants to be treated. This page is the number-by-number reference: find your figure in the chart, then read what it means at the cutting board.

HRC chart: what every number means

Hardness rises steeply on this scale, so two points matter more than they look. Here is the whole usable range for knife steel.

What does 58 HRC mean?

58 HRC is a blade hardened to the point where it holds a fine edge through a week or two of normal prep, but still sharpens quickly on a stone and resists chipping on a wooden board. It is the most forgiving hardness that still counts as a performance edge — which is why so many makers land there.

What does 60 HRC mean?

60 HRC is the middle of the sweet spot. A 60 HRC edge stays usable through several weeks of daily cooking and takes a finer angle than a softer blade, at the cost of needing a wood or soft plastic board rather than glass or stone. Our Bara Forge 8" Chef Knife sits here, with layered steel over a 10Cr17MoV core at 60 HRC.

What does 62 HRC mean?

62 HRC is where edge retention becomes genuinely long-lived and the steel starts trading away toughness. At this hardness the construction matters as much as the number: a hard core wrapped in softer cladding behaves very differently from a mono-steel blade at the same rating.

What is the Rockwell Hardness Scale?

The Rockwell Hardness Scale is a standardised test that measures how well a material resists permanent indentation. Developed in the early 20th century by Hugh and Stanley Rockwell, it remains the industry standard for rating knife steel because it is fast, repeatable, and leaves only a microscopic mark on the blade.

There are several Rockwell scales, each suited to different materials:

• Rockwell B (HRB) uses a hardened steel ball indenter and measures softer metals like copper, brass and mild steel.
• Rockwell C (HRC) uses a diamond cone indenter under a 150 kg load and measures hardened steels — which is why every kitchen knife rating you will see is written as HRC.

When a knife maker says a blade is "60 HRC", they mean the hardened, tempered steel of the finished blade tested at 60 on the Rockwell C scale.

How Rockwell hardness is measured

The test itself is simple. A diamond-tipped indenter is pressed into the steel twice — first with a light preliminary load to seat it, then with the full major load. The machine measures how deep the indenter sinks under the major load compared with the preliminary one. The shallower the indentation, the harder the steel, and the higher the HRC number.

Because the test measures the finished, heat-treated blade — not the raw steel — two knives made from the same alloy can carry different HRC ratings. Heat treatment matters as much as chemistry, which is why a well-executed 58 HRC blade can outperform a poorly hardened 61 HRC one.

Converting Brinell and Vickers to HRC

Steel is sometimes quoted on a different hardness scale, particularly in engineering and tooling data, and the conversions are approximate rather than exact because each test measures a slightly different thing.

• Brinell (HBW/HB) to HRC: around 500 HBW converts to roughly 51 HRC, 550 HBW to about 54 HRC, and 600 HBW to about 57 HRC. Brinell uses a much larger ball indenter, so it is used on softer and coarser-grained metals and becomes unreliable above roughly 650 HBW.
• Vickers (HV) to HRC: about 650 HV is roughly 58 HRC, 700 HV roughly 60 HRC, and 750 HV roughly 62 HRC.
• Rockwell B to Rockwell C: the scales barely overlap. HRB tops out around 100 HRB, which is only about 21 HRC — far below any kitchen blade.

Treat any cross-scale figure as a ballpark. If a maker publishes HRC directly, that number is worth more than a conversion.

Hardness vs toughness: the trade-off that decides everything

Hardness and toughness pull in opposite directions. Hardness is resistance to indentation and wear — it is what lets a thin edge stay sharp. Toughness is resistance to chipping and cracking when the edge hits bone, a board, or a hard floor. Push hardness up and toughness falls, which is why a 65 HRC blade can chip doing work a 56 HRC blade would not notice.

The forging methods that matter exist largely to beat this trade-off. San Mai construction — the method behind our Kaiju series — laminates a hard cutting core (Japanese SLD tool steel in the Kaiju 8" Chef's Knife) between softer, tougher outer layers of 420 stainless. The core holds a screaming edge; the cladding absorbs shock. Layered Damascus does the same job: the Feather Forge 8" Chef Knife wraps 73 layers of feather Damascus around a hard AUS-10 core, so the edge performs like hard steel while the blade behaves like tough steel. Our San Mai guide covers how the lamination is built.

Which HRC should you buy?

That depends on how you cook rather than on the scale itself, so it has a page of its own: our best HRC for kitchen knives guide works through the buying decision blade by blade. The short version is that 58–62 HRC suits most home cooks, and the construction around the number matters as much as the number.

One caveat worth repeating: HRC is necessary but not sufficient. Edge geometry, steel quality and heat treatment decide whether a rating translates into performance. A maker publishing a specific figure — and standing behind it — matters more than the figure itself.

Caring for a harder blade

The higher the HRC, the more a knife rewards good habits: a wood or quality plastic cutting board, hand washing and immediate drying, and sharpening on water stones rather than pull-through sharpeners. Harder steel actually makes sharpening easier in one respect — the edge you set stays set. If you are new to stones, our whetstone guide walks through the full process, and our carbon steel care guide covers drying and oiling.

Common questions

Is 58 HRC on the Rockwell scale good?

Yes, for a kitchen knife. 58 HRC holds a working edge far longer than the 54–56 HRC of a budget blade, while still sharpening quickly and resisting chips. It is a sensible target if you want performance without careful handling.

Is 60 HRC harder than 45 HRC?

Yes, and by a wide margin. Higher numbers always mean harder steel on the Rockwell C scale, and the scale is steep — 60 HRC resists wear dramatically better than 45 HRC. That is why quality kitchen knives almost always test at 56 HRC or above.

What is the highest HRC for a kitchen knife?

Production kitchen knives top out around 66 HRC, using powder steels or hardened single-bevel carbon steel. Above about 63 HRC the blade needs deliberate technique: no bones, no frozen food, no twisting, and a soft board every time.

Does a higher HRC mean harder to sharpen?

Somewhat — harder steel removes more slowly on a stone — but you sharpen it far less often, and the edge it takes is finer. A diamond or ceramic stone handles hard steel more comfortably than a soft natural one.

Shop the range: Chef Knives — every blade hand sharpened and oiled before it ships, with a 99-day home trial and a free lifetime guarantee. If a harder edge is what you are after, the Damascus knives and Kaiju San Mai lines wrap a hard core in tougher cladding.

Keep reading: Best HRC for Kitchen Knives: The Right Hardness to Buy · Types of Steel for Knives: The Complete 2026 Guide · AUS-10 Steel: Is It Good? HRC, Equivalents & vs VG-10