Why does my knife seem dull even after sharpening it?

Edge Geometry Matters

When sharpening a knife, the shape of the edge is crucial. A dull edge often results from an overly rounded or flat bevel, rather than a sharp, V-shaped edge. To achieve the correct edge geometry, use a sharpening stone with grit between 1000-6000 to hone the bevel, then switch to a higher grit stone (around 8000) to polish the edge. For a traditional straight edge, aim for a 20-degree bevel angle on both sides of the blade.

Steel Type and Hardness Play a Role

Low-carbon steel blades can be prone to dulling due to their lower hardness. These blades tend to work-harden more easily, making them more susceptible to dulling. To combat this, use a sharpening steel (also known as a honing steel) after sharpening to realign the edge and prevent it from becoming too hard and brittle. For high-carbon steel blades, use a higher grit stone (around 12000) to achieve a razor-sharp edge.

Sharpening Technique and Maintenance

The sharpening technique itself can also contribute to a dull edge. Avoid applying too much pressure, which can cause the blade to overheat and become brittle. Instead, use a light touch and maintain a consistent angle. Regular maintenance, such as cleaning and drying the blade, can also help prevent dulling. Regularly hone the edge with a sharpening steel to maintain its sharpness and prevent it from becoming dull.