SANTOKU
SANTOKU
In short
12C27 is a Swedish stainless knife steel from Sandvik — about 0.6% carbon and 13.5% chromium, hardened to roughly 56–59 HRC (up to ~61). It is easy to sharpen, tough and rust-resistant, which makes it a solid mid-range steel. For a keener, longer-holding edge, harder Japanese steels like VG10 and AUS-10 (~60–61 HRC) step up a level.
12C27 is one of the most widely used stainless knife steels in the world, developed by the Swedish company Sandvik. It is known for a good balance of sharpness, toughness and corrosion resistance, and it turns up in everything from kitchen knives to scissors. This guide covers what it is actually made of, how hard it is, and how it compares with the Japanese steels we use in our own knives.
What is 12C27 steel? Composition and properties
12C27 is a martensitic stainless steel — a hardenable steel that is heat-treated for edge-holding and strength. Its composition is roughly 0.6% carbon and 13.5% chromium, with small amounts of silicon and manganese. The carbon lets it harden and take a sharp edge; the high chromium is what makes it stainless and corrosion-resistant. (A common myth is that the name “12C27” spells out the recipe — it does not; the real figures are the ~0.6% C and ~13.5% Cr above.)
Hardened correctly, 12C27 reaches around 54–61 HRC on the Rockwell scale, with most production knives finished at about 56–59 HRC. That is a touch softer than premium Japanese kitchen steels, which is why 12C27 is easy to sharpen and forgiving, but does not hold an edge quite as long.
12C27 vs VG10, AUS-10 and AUS-8
Buyers usually reach this page comparing steels. Here is how 12C27 lines up against the Japanese stainless steels we use, and the closely related AUS-8:
| Steel | Carbon | Chromium | Typical HRC | In a nutshell |
|---|---|---|---|---|
| 12C27 | ~0.6% | ~13.5% | 56–59 | Tough, easy to sharpen, good value |
| AUS-8 | ~0.75% | ~14% | 57–59 | Budget Japanese stainless |
| AUS-10 | ~1.0% | ~13–14% | 59–61 | Harder, better edge retention |
| VG10 | ~1.0% | ~15% | 60–61 | Premium, excellent edge retention |
The pattern is clear: 12C27 is a dependable, easy-going steel, while the harder VG10 and AUS-10 hold a finer edge for longer — which is exactly why we build our kitchen knives from them.
Is 12C27 good for kitchen knives?
Yes — it is a genuinely good all-round steel, and knives made from it are easy to live with: quick to sharpen, tough, and rust-resistant. If you cook a lot and want an edge that stays keen for longer between sharpenings, though, a harder Japanese stainless is the better buy. We don’t stock 12C27 knives, but here are the VG10 and AUS-10 blades we’d point you to instead, all in stock with real review scores.
★★★★★ 4.94 (119 reviews)
A hard VG10 core (~60–61 HRC) under a layered Damascus finish — our best-reviewed blade.
View the Aiko Black →
★★★★★ 4.89 (62 reviews)
The same edge-holding VG10 steel at the friendliest price — sold as singles or a set.
View the Riku VG10 →
★★★★★ 4.88 (73 reviews)
If you like the idea of AUS-10, the Minato range is our AUS-10 line — hard, keen and hard-wearing.
View the Minato Santoku →Browse more in Damascus knives and chef knives.
Caring for a 12C27 (or any stainless) knife
The care is the same for any good kitchen stainless: hand-wash and dry it rather than using the dishwasher, sharpen on a fine whetstone (around 1000 grit, refining to 3000–6000), store it protected, and keep it off bone, frozen food and glass boards. Do that and the edge stays keen for years. Our whetstone sharpening guide covers the technique.
Frequently asked questions
Is 12C27 a good knife steel?
Yes — it is a well-balanced mid-range Swedish stainless from Sandvik: easy to sharpen, tough and rust-resistant. It won’t hold an edge as long as harder Japanese steels like VG10 or AUS-10, but it is a dependable, good-value steel.
What is 12C27 steel’s hardness (HRC)?
Around 54–61 HRC depending on heat treatment, with most production knives finished at roughly 56–59 HRC.
What is 12C27 steel’s composition?
About 0.6% carbon and 13.5% chromium, with small amounts of silicon and manganese. The high chromium is what gives it good corrosion resistance.
12C27 vs VG10 — which is better?
VG10 is harder (around 60–61 HRC) and holds an edge longer, which is why premium Japanese knives use it. 12C27 is easier to sharpen and very tough. For a kitchen knife you’ll keep sharp, VG10 or AUS-10 has the edge.
Does 12C27 rust?
It is stainless and resists rust well thanks to its chromium content, but no kitchen steel is fully rust-proof — wash and dry it and it will stay clean.
Related guides
Want a harder, longer-lasting edge than 12C27? Explore our VG10 and AUS-10 range.
Shop Damascus knives →
