Carbon Steel
Carbon Steel
Carbon steel is reactive — it will rust quickly if not properly cared for. Always wash immediately after use, dry thoroughly, and apply a thin coat of food-safe oil (camellia, mineral) before storage. Over time it develops a patina that offers some natural protection and, for many users, becomes part of the knife's character. Rewarding to use, but not recommended if you want a "wash and forget" knife. Various
Carbon steel is reactive — it will rust quickly if not properly cared for. Always wash immediately after use, dry thoroughly, and apply a thin coat of food-safe oil (camellia, mineral) before storage. Over time it develops a patina that offers some natural protection and, for many users, becomes part of the knife's character. Rewarding to use, but not recommended if you want a "wash and forget" knife. Various
SK Steel SK材
Hardness
Rockwell C Hardness(HRC) measures how resistant a steel is to permanent deformation. For kitchen knives:
55–58 HRC — Soft. Easy to sharpen and forgiving of rough use, but dulls faster. Typical of most German knives.
59–61 HRC — Balanced. Good edge retention with manageable sharpening. Common in mid-range Japanese knives.
62–64 HRC — Hard. Excellent edge retention, holds a very fine edge. Requires more care and a fine stone to sharpen.
65+ HRC — Very hard. Exceptional edge longevity but more brittle — more prone to chipping if used roughly.
Higher is not always better — it depends on how you use and maintain your knife.
55–58 HRC — Soft. Easy to sharpen and forgiving of rough use, but dulls faster. Typical of most German knives.
59–61 HRC — Balanced. Good edge retention with manageable sharpening. Common in mid-range Japanese knives.
62–64 HRC — Hard. Excellent edge retention, holds a very fine edge. Requires more care and a fine stone to sharpen.
65+ HRC — Very hard. Exceptional edge longevity but more brittle — more prone to chipping if used roughly.
Higher is not always better — it depends on how you use and maintain your knife.
58–62
HRC
555759616365+
SK4, 5, etc
Composition
SK Steel Element Composition
Compare with
SK Steel
—
0.8%
0.6%
0.4%
0.2%
0
C
0.8%
Mn
0.3%
P
0.03%
S
0.03%
C — Carbon
Mn — Manganese
P — Phosphorus
S — Sulfur
Hardness
58–62 HRC
555759616365+
Knives in SK Steel
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Myojin Riki
Tosa Tanren SK Steel Yanagiba 270mm
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Nagao Kanekoma Factory
Higonokami SK Steel Folding Knife - Medium
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Higonokami SK Steel Folding Knife - Large
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Nagao Kanekoma Factory
Higonokami SK Steel Folding Knife - Small
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Myojin Riki
