Stainless Stainless Steel

"Stainless" means stain-resistant, not stain-proof. In kitchen use, the steel can still discolour or pit if exposed to acidic environments — citrus, vinegar, or salt water — for extended periods. Wash and wipe dry after every use, and avoid leaving the blade soaking in water. With basic care, a stainless knife is very low-maintenance and a great everyday choice. 타케후 특수강, 일본

코발트 스페셜 코발트 스페셜 강

Hardness

60–62 HRC

555759616365+

타케후 특수강의 코발트 스페셜 강은 흔히 코발트강으로 불리며, 뛰어난 절단력 유지와 경도로 유명한 프리미엄 고성능 강재입니다. 이 강재는 조성에 다량의 코발트를 포함하여 내마모성과 강도를 높였습니다. 코발트 외에도 탄소, 크롬, 몰리브덴 등의 원소를 더해 인성을 해치지 않으면서도 높은 경도를 달성할 수 있습니다. 코발트 스페셜 강은 가혹한 사용 환경에서도 오랫동안 날카로움을 유지하도록 설계되어, 고급 주방용 칼과 절삭 도구 제작에 매우 높이 평가됩니다.
모진과 구로사키 같은 장인들이 우수한 COSP 나이프를 선보이고 있습니다.

Compare with

코발트 스페셜

—

16.0% 12.0% 8.0% 4.0% 0

1.05%

16.0%

0.25%

1.5%

0.25%

2.5%

C — Carbon Cr — Chromium V — Vanadium Mo — Molybdenum W — Tungsten Co — Cobalt

Typical values from third-party sources.

Hardness 60–62 HRC

555759616365+

Steel

코발트 스페셜

What's in 코발트 스페셜

What each element does in your knife.

코발트 스페셜 element composition
Element	Composition	What it does in your knife
CrChromium	15.0–17.0%	Raises corrosion resistance; at roughly 13%+ free chromium the steel qualifies as stainless. Also improves hardenability and wear.
CoCobalt	2.0–3.0%	Allows higher hardening temperatures for more hardness and wear resistance, and strengthens the steel matrix.
MoMolybdenum	1.0–2.0%	Improves hardenability and toughness, boosts corrosion resistance, and helps the steel hold hardness under heat.
CCarbon	0.95–1.15%	The primary hardening element. More carbon means a harder edge that holds longer — but past a point it trades away toughness and rust resistance.
SiSilicon	0.6–0.7%	Strengthens the steel matrix and acts as a deoxidiser, improving hardness and resistance to oxidation.
MnManganese	0.3–0.5%	Aids hardenability and strength and acts as a deoxidiser in smelting. Too much can reduce toughness.
VVanadium	0.2–0.3%	Forms extremely hard vanadium carbides for superior edge retention, and refines the grain for a finer, tougher edge.
WTungsten	0.2–0.3%	Forms hard carbides for wear resistance and edge stability, and keeps the steel hard even at elevated temperatures.
NiNickel	0.25%	Improves toughness and ductility without sacrificing hardness, and adds a small boost to corrosion resistance.
PPhosphorus	≤ 0.03%	An impurity from smelting. Even small amounts promote brittleness, so steelmakers keep it as low as possible.
SSulfur	≤ 0.01%	An impurity that reduces toughness and promotes brittleness; only ever added deliberately in free-machining steels.

Composition from zknives (K&S steel dataset) reference material. These ranges come from the K&S steel composition dataset, which is derived from zknives; maker figures are cited separately only when they are used on the page.