Carbon steel vs stainless steel knives: which should you buy?

Carbon steel takes a finer edge and comes back quickly on a stone, and it rusts if you leave it wet. Stainless shrugs off a wet counter and asks less of you, and many stainless knives give up a little edge to do it.

Neither is the better steel for everyone. The right one depends on what happens to your knife between the cutting board and the drawer.

We sell carbon steel knives from STEELPORT and no stainless ones, so read this knowing that. Every fact below comes from makers, knife shops and a metallurgist's published tests, linked at the end.

Why does the steel in a knife matter?

In short. The steel decides how sharp the knife gets, how long it stays that way, and how much fuss it needs after you cook.

You finish slicing tomatoes, set the knife by the sink and sit down to eat. A stainless blade will most likely look the same an hour later. A carbon steel blade will have a gray print where the juice sat, and maybe an orange speck if it stayed wet long enough.

That's the whole trade in one evening. Carbon steel pays you back at the cutting board, and stainless pays you back at the sink.

How do carbon steel and stainless knives compare?

In short. Carbon steel wins on edge and ease of sharpening. Stainless wins on rust resistance and looking the same for years.

	Carbon steel	Stainless steel
Chromium	Little. STEELPORT's 52100 has about 1.5%	At least 10.5%, the definition of stainless
Rust	Rusts if left wet	Resists rust, though any stainless can rust under the right conditions
Color over time	Darkens to a gray, blue or brown patina	Stays bright
Edge	Takes a very fine edge, per makers and knife shops	Depends on the steel. Many give up some edge for easier care
Sharpening	Comes back quickly on a stone	Can take more work on a stone
Chipping	Harder edges chip more readily	Usually less prone to chipping
Example hardness	STEELPORT: 65 HRC edge, 30 HRC spine	Wüsthof Classic: 58 HRC
Dishwasher	No	No, per Wüsthof, which says hand wash and towel dry
Example 8 inch chef knife	STEELPORT, $400, made in Oregon	Wüsthof Classic, $170 regular price, made in Germany
Best for	Cooks who dry the knife right away and like to sharpen	Cooks who want to wash, dry later and not think about it

HRC is the Rockwell hardness scale for steel. Higher means harder.

What makes a steel stainless?

In short. Chromium. Steel with at least 10.5% chromium counts as stainless, and the chromium is what keeps it from rusting.

That floor comes from worldstainless, the stainless industry's own association. STEELPORT's 52100 sits far below it, at about 1.5% chromium and 1% carbon.

Knife shops often draw the line higher. Bernal Cutlery calls anything under 13% chromium a carbon steel for knife purposes, and adds that every stainless can rust under the right conditions.

Which is sharper, and which holds an edge longer?

In short. Carbon steel usually takes the finer edge and sharpens back faster. How long the edge lasts depends more on the exact steel and its hardness than on the word carbon.

Opinel makes knives in both steels. It says carbon steel can be sharpened to a finer edge, is easier to sharpen, and generally holds that edge longer than its stainless.

The published tests are more mixed. One set of cutting tests summarized by Knife Steel Nerds, a metallurgy site, found 52100 held an edge longer than a plainer carbon steel and less long than a stainless called AEB-L.

Hardness plays a part too. The same site says a harder edge resists rolling over, and STEELPORT hardens its edge to 65 HRC against 58 for the Wüsthof Classic.

Which chips more easily?

In short. A harder, finer edge chips more readily. Stainless kitchen knives, usually softer, tend to bend before they chip.

Knife Steel Nerds puts it plainly: as steel gets harder, it gives up more toughness than it gains in edge retention. Opinel says its stainless is typically less prone to chipping.

In practice, that means a very hard edge wants a wood or soft plastic board and no twisting through bone. STEELPORT keeps the spine of its knives softer, at 30 HRC, so the blade as a whole isn't brittle.

Does a stainless knife need care too?

In short. Less, but not none. Wüsthof tells owners of its stainless knives to hand wash and towel dry them right away.

Its care page also says to skip abrasive sponges and soaking in the sink, and to hone the knife regularly. That's most of the carbon steel routine, minus the oil and the urgency.

Bernal Cutlery adds that no knife comes through a dishwasher unharmed, stainless only more slowly. So the real gap is how forgiving each steel is when you forget.

What is each steel good at, and what should you watch for?

In short. Carbon steel is good at edges and bad at being ignored. Stainless is good at being ignored and gives up a little at the edge.

Carbon steel is good at:

A fine edge. Thin slices of tomato and onion, and clean cuts through herbs without bruising them.
Coming back fast. A few minutes on a stone or a rod restores it, per Opinel and Chef Knives To Go.
Showing its use. The patina records what you've cut, and some cooks like that.

Watch for with carbon steel:

Rust. Leave it wet and orange spots appear. Dry it right away and they don't.
Color change. It won't look like its product photo after a month of cooking.
Chips. A hard edge wants a forgiving board and no twisting.

Stainless is good at:

Forgiving a wet counter. The chromium keeps rust away through most lapses.
Staying bright. It looks much the same in five years.
Taking knocks. Softer edges bend before they chip, and a honing rod straightens them.

Watch for with stainless:

Edge life. Opinel says some stainless steels dull faster than carbon steel and need sharpening more often.
Sharpening. It can take more work on a stone.
The dishwasher. Makers still say to keep it out.

Which should you buy?

In short. Carbon steel if the towel is already in your hand. Stainless if knives sit by the sink until morning.

Carbon steel is a good fit if you:

already dry your knife before you put it down
want the sharpest edge you can get and like to sharpen it yourself
like tools that show their use

Stainless is a good fit if you:

leave knives wet by the sink or share a kitchen with someone who does
cut a lot of citrus and tomatoes and don't want to wipe between jobs
want the blade to look the same in five years

Plenty of cooks own one of each: a carbon steel chef knife for prep, and a stainless knife for the lemon at the bar.

If carbon steel suits you, the STEELPORT knives we carry are in our knives collection, and our guide to carbon steel knife care covers the daily routine.

Common questions

Is carbon steel better than stainless steel for knives?

Neither is better for everyone. Carbon steel usually takes a finer edge and sharpens faster, and stainless resists rust and asks less care.

Is a carbon steel knife sharper than a stainless one?

Usually, out of the box and after sharpening. Opinel says carbon steel can be sharpened to a finer edge, though some modern stainless steels come close.

Do stainless steel knives rust?

Rarely, but they can. Bernal Cutlery says every stainless can rust under the right conditions, which is why makers still say to dry them.

Which is easier to sharpen, carbon or stainless?

Carbon steel. Opinel says you can get a very sharp edge on carbon steel more easily, even with basic skills.

Can you put a carbon steel or stainless knife in the dishwasher?

Makers say no for both. STEELPORT says never for its carbon steel, and Wüsthof says hand wash and towel dry for its stainless.

What is high-carbon stainless steel?

Stainless steel with enough carbon to harden well for a knife edge. It still carries at least 10.5% chromium, so it resists rust like other stainless.

Why is my carbon steel knife turning gray?

That's patina, a thin layer of oxidation that forms with use. STEELPORT says it's normal and doesn't affect how the knife cuts.

Is a harder knife always better?

No. A harder edge resists rolling over, and it gives up toughness, so it chips more easily, per Knife Steel Nerds.

Sources

A maker or shop page tells you what that business states. It isn't independent proof.

STEELPORT Knife Co., FAQ (52100 steel, 65 HRC edge, patina is normal). steelportknife.com. VERIFIED, maker statement.
STEELPORT Knife Co., 8 inch Chef Knife (not stain or rust resistant, 30 HRC spine). steelportknife.com. VERIFIED, maker statement.
STEELPORT Knife Co., Care and Use (no dishwasher, no soaking). steelportknife.com. VERIFIED, maker statement.
WÜSTHOF, Classic 8 inch Chef's Knife (58 HRC, made in Germany, regular price, hand wash and towel dry, no soaking, honing). wusthof.com. VERIFIED, maker statement.
Opinel USA, Carbon Steel vs. Stainless Steel Knives (sharpness, edge retention, ease of sharpening, chipping, maintenance). opinel-usa.com. VERIFIED, maker statement.
worldstainless, Introduction to Stainless Steels (minimum 10.5% chromium). worldstainless.org. VERIFIED, industry association.
AZoM, AISI 52100 Alloy Steel datasheet (carbon 0.98 to 1.10%, chromium 1.30 to 1.60%). azom.com. REPORTED, materials reference site.
Knife Steel Nerds, History and Properties of 52100 Steel (published edge tests against other steels). knifesteelnerds.com. REPORTED, secondary source citing published tests.
Knife Steel Nerds, Knife Steels Rated by a Metallurgist (hardness, toughness and edge retention trade-offs). knifesteelnerds.com. REPORTED, metallurgist's published ratings.
Bernal Cutlery, Knife Care (carbon and stainless by chromium content, any stainless can rust, dishwashers). bernalcutlery.com. VERIFIED, knife shop statement.
Chef Knives To Go, Carbon Steel Knife Care Guide (sharpening). chefknivestogo.com. VERIFIED, knife shop statement.