Stop Seasoning Carbon Steel Like Cast Iron

Main Ideas

• Carbon steel should not simply be seasoned like cast iron. The narrator’s experiments suggest that carbon steel is denser and more uniform than cast iron. Techniques that strongly texture cast iron—especially simmering it in vinegar—have less dramatic effects on carbon steel.
• Heat bluing followed by burner seasoning is the practical recommendation. Rust bluing produced the strongest results in the tests, but it was time-consuming. For most people, the narrator recommends classic heat bluing and careful burner seasoning.
• A dark, attractive finish does not necessarily mean durable seasoning. Cooking revealed weak spots in the pans. Excessive heat or too much oil could make seasoning look impressive at first but cause it to wear away quickly.

Experiment Results

Vinegar Simmering

The narrator simmered a pan for 10–15 minutes in vinegar diluted to 2.5% acidity. This had little visible effect on the carbon steel compared with cast iron.

The narrator attributes the difference to cast iron’s graphite flakes and comparatively porous structure, which make its surface react more unevenly with acid. Carbon steel’s denser, more uniform structure limits the reaction mainly to the surface.

Rust Bluing

The narrator applied a solution of hydrogen peroxide, vinegar, and uniodized salt to rust the pan. They then steamed it to turn the red rust into black rust (magnetite), scrubbed it, and repeated the process.

This created more surface texture than vinegar simmering and gave the best resistance in the cooking tests. However, the narrator later cautioned that rust bluing is labor-intensive and unnecessary for most users.

Heat Bluing

Heating iron to roughly 550–600°F forms a thin magnetite layer. As the oxide layer thickens, it changes color, progressing roughly from yellow and gold through brown and purple to blue and eventually gray.

The narrator describes dark blue as a useful target. If the layer grows too thick, it may become brittle or flaky.

Cooking Tests

The pans were tested with Brussels sprouts and a sweet, acidic sauce, followed by tomato sauce simmered for about five minutes. The rust-blued pan changed the least. The heat-blued pans showed more wear, while the vinegar-treated pan was intermediate.

These acidic sauces are harsh tests. The narrator says stainless steel is better suited to simmering acidic sauces.

Recommended Heat-Bluing and Burner-Seasoning Method

1. Remove factory coatings thoroughly. The wax on the test pans resisted ordinary washing and boiling water. The narrator used a lye bath and Bar Keepers Friend to finish removing it.
2. Heat-blue the pan.
   • Heat the steel until it reaches the blue range, around 550–600°F.
   • Aim for an even result. The narrator found that inverting the pan over a burner helped distribute heat more evenly.
   • A contact thermometer can help; infrared thermometers may be unreliable on shiny, reflective steel.
   • Avoid making the oxide layer excessively thick.
3. Warm the pan to about 200°F for seasoning.
4. Apply oil very thinly.
   • Wipe oil over the whole pan with a paper towel or a cloth made entirely of natural fiber.
   • Use a second dry cloth to remove as much oil as possible.
   • The narrator used grapeseed oil but did not identify it as the best oil.
5. Heat gradually to just above the oil’s smoke point.
   • The narrator’s target was roughly 475–500°F.
   • Avoid going much above 550°F. The narrator warns that the oil can begin to break down through pyrolysis rather than form a sound seasoning layer.
   • If the burner heats only part of the pan, move the pan to distribute heat.
6. Let the smoke stop. A little smoking is expected, but heavy smoke suggests too much oil or too much heat. Once smoking stops after a few minutes, turn off the heat and let the pan cool in the air.
7. Repeat if desired. When the pan cools to roughly 200–300°F, wipe on a little more oil, wipe it nearly all off, and repeat the heating process.
8. Check the cloth material. The narrator accidentally used a cotton-polyester cloth on a hot pan; it melted and burned onto the surface. Use paper towels or verified 100% natural-fiber cloth instead.

Additional Observations and Cautions

• The narrator’s initial oven-seasoning attempt on a Lodge carbon steel pan failed during its first cook. Later testing supported using a burner rather than the narrator’s usual cast-iron oven method, though the exact reason was not established.
• Three seasoning cycles and ten cycles performed similarly in some tests. Adding many layers did not automatically make the seasoning more durable.
• After several burner-seasoning cycles, the Lodge pan began to repel oil at room temperature—an effect the narrator called oleophobic. The narrator found this unusual and associated it with good nonstick performance and easier cleaning, but did not present it as a universal result.
• A very glossy “black mirror” finish may require applying more oil than the recommended thin-layer method. The narrator cautions that such a finish can look good yet fail during cooking, and says its long-term performance remains uncertain.
• The narrator’s final recommendation is to use heat bluing followed by careful burner seasoning for most carbon steel pans. Vinegar simmering is unlikely to hurt, but should not be expected to transform carbon steel as it can cast iron.

Speakers and Sources Featured or Cited

• Noah Bristol — narrator and experimenter; also delivers the Monarch sponsorship segment.
• Monarch — sponsor featured in an advertisement read by the narrator.
• Oxen Forge Walks — cited for a blowtorch bluing demonstration.
• Zen Juan — cited for an induction-coil bluing demonstration.
• Papa Mau — cited for a “black mirror” seasoning example and a follow-up showing that its finish wore down during cooking.
• An unnamed commenter or viewer — asked whether vinegar simmering works on carbon steel; another commenter’s rust-bluing method informed the experiments.
• Green Haven Forge and its owner — the owner supplied pans for testing and was described as making them in small batches.
• Lodge and Smithy — cookware makers mentioned in discussion of pan surfaces and factory seasoning; they are not presented as speakers.