Hairdressing Scissor Steel Guide: ATS-314 vs VG10 vs Cobalt vs 440C

Steel is the one thing marketers cannot fake. Written by Matt Grumley — 35+ years behind the chair and at the sharpening stone, founder of ShearGenius (est. 2007).

Every scissor brand claims "Japanese steel." Almost none of them will tell you which one, what hardness, or who forged it. This is the guide I wish I had when I started sharpening scissors in 1991. By the end, you will know exactly what you are holding and exactly what you are paying for.

Why Steel Matters

The steel determines three things that define a scissor's entire working life: how sharp it can get, how long the edge lasts, and whether it resists corrosion in a humid salon. Handles wear, screws loosen, bearings can be serviced — but the steel is the scissor. Cheap steel cannot be rescued by a premium grind.

The Five Steels You Will Encounter

1. Hitachi ATS-314 (Premium Japanese)

Used in: Most premium ShearGenius models, top-tier Mizutani, top-tier Joewell, Kamisori Premium.
Hardness: 58-62 HRC depending on heat treatment.
Composition: Cobalt-molybdenum high-carbon stainless tool steel forged by Hitachi Metals in Japan.
Strengths: Holds a true convex edge, excellent edge retention, corrosion resistant, accepts 20-22° edge angles without chipping.
Weakness: Expensive — the billet cost alone is 3-5× 440C.
Verdict: The benchmark for premium Japanese hairdressing scissors. If a brand claims ATS-314, ask for the Hitachi mill certificate.

2. Japanese Cobalt Alloy

Used in: Some ShearGenius models, Joewell 3*, mid-tier Japanese imports.
Hardness: 56-60 HRC.
Strengths: Excellent corrosion resistance, holds a convex edge well, more forgiving than ATS-314 under impact.
Weakness: Slightly less edge retention than ATS-314 at identical hardness.
Verdict: Genuinely premium. The right choice for stylists who want Japanese quality in a slightly lower price bracket. Not a downgrade — a different set of trade-offs.

3. VG10

Used in: Takumi-branded scissors, many boutique Japanese brands.
Hardness: 58-61 HRC.
Strengths: Very close to ATS-314 in edge retention.
Weakness: Slightly softer matrix, marginally less corrosion resistance.
Verdict: Genuinely good steel. Heavily marketed because it is easier to source than ATS-314. You are not being scammed if a scissor is VG10, but you are paying premium for the second-best option.

4. 440C Stainless

Used in: Almost every scissor under $250, most "student" and "starter" shears, many eBay imports.
Hardness: 54-58 HRC.
Strengths: Cheap, widely available, corrosion resistant.
Weakness: Cannot hold a true convex edge for long. Loses sharpness in weeks of daily use.
Verdict: Fine for apprentices learning the basics. Not a career scissor.

5. Damascus (Pattern-Welded)

The honest truth: Damascus is a construction method, not a steel grade. The core steel (VG10, ATS-314 or worse) determines performance; the layered pattern is decoration. A Damascus scissor with a 440C core cuts worse than a plain ATS-314. Buy the core, not the photograph.

Hardness Without the Marketing

  • 54-56 HRC: Kitchen scissors, student shears. Avoid for professional use.
  • 56-58 HRC: Entry professional. Acceptable for apprentices.
  • 58-60 HRC: Professional standard. Most working stylists should be here.
  • 60-62 HRC: Premium / master level. ShearGenius Forged ATS-314 Ultimate Alloy lives in this zone.

Harder is not always better. Above 62 HRC steel becomes brittle and chip-prone. The correct hardness for hairdressing is 58-62 — hard enough to hold an edge, tough enough to survive a dropped scissor.

Related Reading

Further Reading

More expert guides from Matt Grumley — 35+ years behind the chair.