X55CrMo14 vs AUS-8
Quick answer
AUS-8 is the harder steel at 57 to 58 HRC against 55 to 56. It holds an edge longer and is more prone to chipping, while X55CrMo14 is the tougher of the two. With sharpening effort level, the deciding difference is edge retention, which points to AUS-8.
Hardness figures are published by the makers. The comparative scores are relative rankings rather than measurements.
| X55CrMo14 | AUS-8 | |
|---|---|---|
| Origin | Swiss | Japanese |
| Hardness | 55 to 56 HRC | 57 to 58 HRC |
| Stainless | Yes | Yes |
| Edge retention | 2/5 | 3/5 |
| Toughness | 5/5 | 4/5 |
| Corrosion resistance | 5/5 | 4/5 |
| Ease of sharpening | 5/5 | 5/5 |
| Found in | Victorinox Fibrox and Swiss Classic | Entry-level Japanese knives |
The short answer
AUS-8 is the harder steel at 57 to 58 HRC against 55 to 56. That means AUS-8 holds a working edge for longer and fails by chipping rather than rolling when it meets a bone or a frozen edge, while X55CrMo14 is the more forgiving of the two.
With sharpening effort level, the deciding difference is edge retention, which points to AUS-8. Since both take the same effort to sharpen, the longer lasting edge is a free gain.
What X55CrMo14 is like to live with
Softer than most kitchen steel, which is exactly why a professional kitchen tolerates it: it dulls fairly quickly and comes back in seconds on a steel, and it survives abuse that would chip a harder blade.
As a stainless steel with a corrosion score of 5 out of 5, it handles ordinary kitchen use without trouble. Sharpening scores 5 out of 5, meaning it comes back quickly on almost any abrasive.
What AUS-8 is like to live with
The usual entry point into Japanese knives. Easy to sharpen, forgiving, and it gives a Japanese blade geometry without a premium steel price.
As a stainless steel with a corrosion score of 4 out of 5, it handles ordinary kitchen use without trouble. Sharpening scores 5 out of 5, meaning it comes back quickly on almost any abrasive.
The trade underneath both of them
Hardness, edge retention, toughness and ease of sharpening are not four independent qualities that a good steel maximises. They trade against each other. Adding carbon and hardening further gives a finer, more wear-resistant edge and makes the steel more brittle and harder to abrade. Every kitchen steel is a chosen point on that curve, and the makers who use these alloys chose different points on purpose.
Geometry matters at least as much. How thin the blade is behind the edge, and the angle it is ground to, decide how a knife feels in the cut far more than the alloy does. German knives are typically ground about 14 to 20 degrees per side and Japanese double-bevel knives about 10 to 16, and that difference is more noticeable in the hand than the difference between these two steels.
Knives in these steels
- IGNITED CUTLERY
8 Inch Chef Knife, German Stainless Steel, Ivory White Handle
8 inUnder $25 Check priceBudget band; Amazon shows the current price - Wüsthof
Wüsthof Classic Ikon 8" Chef's Knife
8 inUnder $250 Check priceBudget band; Amazon shows the current price - Shun
Shun Classic 8" Kiritsuke Knife
8 inUnder $250 Check priceBudget band; Amazon shows the current price
Common questions
Which holds an edge longer, X55CrMo14 or AUS-8?
AUS-8, scoring 3 out of 5 against 2. Edge retention tracks hardness closely, and AUS-8 is the harder of the two at 57 to 58 HRC. The cost of that retention is that AUS-8 chips rather than rolls when it meets something hard.
Which is easier to sharpen?
Neither. Both score 5 out of 5 for ease of sharpening, so they come back on a stone in about the same time. Both respond well to almost any abrasive.
Which is better for a first good knife?
X55CrMo14. A first good knife should forgive mistakes: meeting a bone, a slightly wrong sharpening angle, being left in the sink. Toughness and easy sharpening deliver that. Edge retention becomes worth paying for once you have the skill and the stone to restore the edge.
Does either one rust?
Neither, in normal use. Both are stainless with high chromium content, so ordinary kitchen work will not corrode them. Both should still be washed and dried by hand, because a dishwasher pits the surface and knocks the edge against other items.
Is the more expensive steel worth it?
Only if your maintenance habits match it. Premium steel in the hands of someone who never sharpens is an expensive blunt knife within a year, because it eventually dulls like everything else and is harder to restore. The upgrade that reliably improves daily cooking is a whetstone and the willingness to use it, and that upgrade costs less than either knife.
