Stainless Steel vs Carbon Steel Frying Pans: Two Honest Tools

What is the difference between stainless steel and carbon steel?

Both are steel, which means both are mostly iron with a small amount of carbon. The difference is what else is in the alloy. Carbon steel cookware is close to plain iron and carbon, with very little else added. Stainless steel must contain at least 10.5% chromium by definition, and common food-grade grades such as 304 (18/8) carry roughly 18% chromium and 8% nickel.

That chromium is the whole story. It reacts with oxygen to form an extremely thin, invisible chromium oxide film across the surface. The film is stable, and if it is scratched it re-forms on its own in air. It is why stainless steel stays bright and resists rust without any help from the cook.

Carbon steel has no such film. Its bare surface is reactive iron, so it needs a protective layer supplied from outside: seasoning.

Does a carbon steel pan need seasoning, and does stainless steel?

A carbon steel pan needs seasoning to work well. Seasoning is a thin layer of oil heated past its smoke point until it polymerises, turning from a liquid into a hard, slick, dark layer bonded to the iron. Some carbon steel pans arrive with a protective wax or oil that has to be removed; others come pre-seasoned. Either way, seasoning is built up on the hob or in the oven with several very thin coats of a neutral oil.

That layer grows with use. Each time you cook with fat, a little more polymerises, and the pan becomes more slippery over months. It can also be damaged: long soaks, harsh scrubbing and acidic food wear it back, and it then needs a touch-up.

Stainless steel does not need seasoning. It can take a temporary layer of polymerised oil, but that layer scrubs off with normal washing, so it is not relied on for release. Release on stainless steel comes from technique instead: preheat the dry pan until a drop of water beads and glides, add fat, let it shimmer, then add dry food and let it release on its own.

Can you cook acidic foods like tomatoes in carbon steel?

Briefly, yes. For long, it is best avoided. Acids such as tomato, wine, vinegar and citrus attack both the seasoning and the iron beneath it. A quick deglaze is usually fine on a well-seasoned pan. A slow tomato sauce or a wine braise can strip seasoning, leave bare grey patches and give the food a metallic taste.

Stainless steel is largely non-reactive with everyday cooking acids thanks to that chromium oxide film. You can simmer a tomato sauce for an hour, reduce wine for a pan sauce or finish with lemon juice, and the pan will not give the food a metallic taste or discolour it the way bare iron can.

• Carbon steel: short contact with acid is fine; long simmers strip seasoning.
• Stainless steel: tomato sauces, wine reductions and citrus finishes all work.
• Carbon steel changes colour as it seasons, from silver-grey to brown to black. That darkening is normal.
• Stainless steel can show a faint rainbow or golden heat tint after high heat. It is cosmetic, and a splash of white vinegar usually lifts it.

Which heats faster: carbon steel or stainless steel?

Carbon steel frying pans are usually a single piece of fairly thin iron-based metal. They come up to temperature quickly and respond fast when you turn the heat up or down. Because iron is only a moderate conductor and the metal is thin, a carbon steel pan can run hotter over the flame or ring than at its edges, especially when the pan is larger than the hob ring.

Stainless steel on its own is a relatively poor conductor of heat. That is why many stainless steel frying pans pair a stainless cooking surface with a more conductive metal, such as aluminium or copper, in the base or through the body to spread heat more evenly. How a given stainless steel pan responds depends on how it is built.

In daily use, both reward a proper preheat over a medium heat. Carbon steel is quick to heat and quick to overshoot. A thicker stainless steel pan takes a little longer and tends to hold steady once it is there.

Weight is a separate question. Carbon steel pans are much lighter than cast iron of the same size, but against stainless steel, thickness, handle design and anything added to the base change the weight far more than the choice of steel does.

Does carbon steel rust, and does stainless steel?

Carbon steel rusts readily if its seasoning is thin or damaged and the pan is left wet. A pan air-drying on a rack overnight can show orange spots by morning. Rust is fixable: scrub the spot back to bare metal, dry the pan over heat and re-season. Still, it is the maintenance habit carbon steel asks of you every day.

Stainless steel is rust-resistant rather than rust-proof. Under normal kitchen use, its chromium oxide film keeps corrosion away, so a stainless steel pan can be washed, towel-dried and put away without further steps. Salt left sitting on the surface or long soaks in harsh cleaners can cause small pits over time, so rinse promptly and dry.

How do you clean carbon steel vs stainless steel?

Care is where the two pans feel most different day to day.

• Carbon steel: rinse with hot water and a brush, use a little washing-up liquid if needed, avoid soaking, dry immediately over a low heat and wipe on a very thin film of oil.
• Carbon steel: never put it in the dishwasher; the detergent and long wet cycle strip seasoning and invite rust.
• Stainless steel: wash with hot soapy water and a sponge; stuck-on food lifts after a short soak or a simmer of water in the pan.
• Stainless steel: a non-scratch scourer or a paste of bicarbonate of soda handles browned residue, and vinegar lifts heat tint.
• Both: let a hot pan cool before it meets cold water, which reduces the risk of warping.

Which should you choose: carbon steel or stainless steel?

Choose by what you cook most and how much upkeep you enjoy.

• Carbon steel suits high-heat searing, stir-frying, crêpes and cooks who like building and maintaining seasoning over time.
• Stainless steel suits pan sauces and fond, tomato and wine dishes, braises started on the hob, and cooks who want to wash, dry and put the pan away.
• Eggs are easier on a well-seasoned carbon steel pan; on stainless steel they need a proper preheat and enough fat, and then they usually release cleanly.
• If you cook widely, owning one of each is common: carbon steel for the fastest, hottest jobs and stainless steel for everything acidic or sauce-based.

Where do SEIDO frying pans fit?

SEIDO makes the stainless side of this comparison. Each frying pan has a tri-ply clad body — a 304 (18/8) stainless steel cooking surface, an aluminium core and a 430 stainless steel exterior — and the cooking surface is uncoated, so there is no seasoning to build or maintain. Each comes with a matching stainless steel lid. SEIDO frying pans are oven-safe to 260°C (500°F) for up to 1 hour, work on gas, electric, ceramic and induction hobs, and each is backed by a 5-Year Limited Warranty.