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12C27 is a stainless blade steel from Alleima, the company name you will see on current datasheets for the material long associated with Sandvik. It is worth considering on the merits of the knife around it: the grind, heat treatment and handle have a large part in how useful the blade feels. This profile covers 12C27 specifically, rather than combining similarly named grades.
What Is 12C27 Steel?
Alleima 12C27 is a martensitic stainless strip steel intended for knives. It is a separate designation from 12C27M, 13C26 and 14C28N. The producer sheet lists nominal carbon and chromium alongside other controlled elements, but the composition is not a finished-knife performance specification.
What Matters for Cutting Performance?
Alleima explains that heat treatment controls the final properties of 12C27. When choosing a knife, look for information from the maker about that treatment and the intended role of the blade. A thin slicer and a thicker working blade can behave differently even when both carry the same steel marking.
For everyday cutting, consider how the blade enters and passes through the material, along with how often you are happy to sharpen it. The producer's general property descriptions do not establish a fixed cutting life for the knife you buy.
Sharpening and Stainless Care
For maintenance, follow the existing bevel with an abrasive that cuts effectively and remove the burr before testing the edge. Choose a coarser grit when there is damage to repair rather than expecting a fine finishing stone to do the shaping.
12C27 is stainless, but clean away salt or food residue and dry the knife after wet use. Consider the handle, pivot and other components too, since the blade's material does not describe the corrosion resistance of the whole knife.
Choosing a 12C27 Knife
A 12C27 knife is worth considering if its design and execution suit your use. Compare the blade shape, dimensions, handle comfort and maker support rather than treating a familiar steel name as a complete recommendation. If an older listing says Sandvik and a newer one says Alleima, check the full grade designation before assuming the steel itself changed. Our knife steel guide helps put the broader options in context.
Composition
Our composition guide explains what alloy values can and cannot tell you.
Alleima 12C27: Alleima nominal composition; figures describe the producer grade, not an assay of a finished blade. Alleima 12C27 technical datasheet.
| Element | Alleima 12C27 |
|---|---|
| Carbon (C) | 0.6% |
| Chromium (Cr) | 13.5% |
| Silicon (Si) | 0.4% |
| Manganese (Mn) | 0.4% |
| Phosphorus (P) | ≤0.025% |
| Sulfur (S) | ≤0.01% |
Compare Two Knife Steels
Sources and Update Notes
This steel is not included in the numerical ratings used by our comparison tool.
