How to Sharpen Different Knife Steels: Best Angles and Methods for D2, S35VN, M390, and 14C28N

Different knife steels respond to sharpening in vastly different ways. A technique that produces a razor edge on 14C28N may struggle to remove burrs on M390, and an angle that works perfectly for D2 may be too acute for S35VN. Understanding how steel composition, hardness, and carbide structure affect sharpening is essential for getting the best performance from each knife in your collection.

Sharpening angle guide for common EDC knife steels

This guide covers sharpening best practices for four common knife steels found in modern EDC folding knives, including many Artisan Cutlery models. Each steel requires a slightly different approach to achieve optimal edge geometry and longevity.

Sharpening Principles by Steel Type

Before diving into specific steels, understand these fundamental factors that determine sharpening strategy:

• Carbide volume: Steels with high carbide content (M390, S35VN) require abrasives hard enough to cut through vanadium and niobium carbides — standard aluminum oxide stones wear too quickly.
• Hardness (HRC): Harder steels (60+ HRC) take longer to apex but hold their edge longer. Softer steels (56-58 HRC) sharpen quickly but require more frequent maintenance.
• Toughness: Tough steels resist edge chipping at acute angles but may form more burr during sharpening.
• Burr formation: Some steels form stubborn, tenacious burrs that require careful deburring technique to avoid a false edge.

Sharpening D2 Steel

D2 is a high-carbon tool steel with large chromium carbides that provide excellent wear resistance. It sharpens reasonably well on conventional stones but benefits from diamond or CBN abrasives for faster material removal.

• Recommended angle: 20 degrees per side (40 degrees inclusive)
• Abrasive: Diamond or CBN plates (coarse ~300 grit for reprofiling, medium ~600 grit for sharpening, fine ~1200 grit for finishing)
• Burr management: D2 forms a strong, wire-like burr that must be removed thoroughly. Use light edge-leading strokes on a fine stone, then strop with compound.
• Edge finish: A 600-grit diamond finish provides an excellent working edge. D2 does not benefit from ultra-high polish as much as simpler steels.
• Stropping: Diamond emulsion on leather or balsa wood works well for deburring and refining the apex.

Sharpening S35VN Steel

S35VN is a powder metallurgy stainless steel with added niobium for improved toughness. Its fine carbide structure makes it easier to sharpen than many premium steels while still delivering good edge retention.

• Recommended angle: 17-20 degrees per side (34-40 degrees inclusive)
• Abrasive: Diamond or CBN recommended. Silicon carbide stones work but wear faster.
• Burr management: S35VN forms a moderate burr that responds to light edge-leading passes followed by edge-trailing strokes on a strop.
• Edge finish: A 1000-grit diamond finish strikes an excellent balance between sharpness and edge stability.
• Angle adjustment: For general EDC use, 18 degrees per side offers a good compromise. For harder use, raise to 20 degrees for improved edge stability.

Sharpening M390 Steel

M390 is a high-vanadium powder metallurgy stainless steel with exceptional wear resistance. Its high carbide volume makes it the most challenging steel in this group to sharpen effectively.

• Recommended angle: 17-18 degrees per side (34-36 degrees inclusive)
• Abrasive: Diamond or CBN only. Aluminum oxide and silicon carbide stones simply polish the metal matrix without cutting the vanadium carbides.
• Burr management: M390 can form a stubborn, clinging burr. Use alternating light edge-leading passes on a fine diamond plate, then edge-trailing strokes on loaded leather.
• Edge finish: A 600-1000 grit diamond finish provides an excellent balance. Ultra-fine polishes (3000+ grit) can reduce the micro-serrations that give M390 its cutting aggression.
• Sharpening time: Expect M390 to take 2-3 times longer than D2 to raise a burr on a fresh edge. This is normal — the same carbide structure that makes it hard to sharpen also gives it exceptional edge retention.

Sharpening 14C28N Steel

14C28N is a nitrogen-enriched stainless steel with a fine, even carbide structure. It is the easiest steel in this group to sharpen and responds well to a wide range of abrasives.

• Recommended angle: 15-18 degrees per side (30-36 degrees inclusive)
• Abrasive: Any quality sharpening medium works — aluminum oxide, silicon carbide, ceramic, or diamond. This makes 14C28N an excellent choice for beginners.
• Burr management: Burr forms quickly and removes easily. Light edge-leading strokes on a fine stone followed by a few stropping passes produce a clean edge.
• Edge finish: 14C28N responds well to high-polish finishes. A 3000+ grit finish reveals the steel's natural ability to take a keen, sticky-sharp edge.
• Angle adjustment: At 15 degrees per side, 14C28N takes an extremely sharp edge suitable for light slicing tasks. For harder use, 17-18 degrees provides more stability.

Sharpening Method Comparison

General Sharpening Tips

• Mark the edge: Use a permanent marker on the bevel to confirm you are hitting the correct angle on each pass.
• Use light pressure: Let the abrasive do the work. Excessive pressure breaks down diamond abrasives faster and creates uneven bevels.
• Count passes: Alternate an equal number of passes on each side to maintain bevel symmetry.
• Test with paper: A clean push cut through printer paper confirms a sharp apex. Hanging hair test is optional — paper-cutting sharp is sufficient for EDC.
• Strop after every sharpening: Even a few passes on loaded leather remove the micro-burr and align the apex for maximum sharpness.

Matching your sharpening technique to the specific steel in your knife transforms sharpening from a chore into a skill that extends the life and performance of every blade in your rotation.

Find your ideal everyday carry configuration — explore the Artisan Cutlery folding knife collection for premium EDC folders built for reliable everyday carry.