ATS-314 Steel
Description
ATS-314 is Hitachi's cobalt-enriched stainless at HRC 60-62, delivering glassy convex edges for slide cutting in premium Japanese scissors.
ATS-314 Steel
Quick look
- Hardness window: 64–64 HRC after vacuum hardening.
- Toughness: High wear resistance with tempered resilience; punishes over-tight pivots.
- Corrosion profile: Premium stainless response that shrugs off perms and lighteners if wiped down daily.
- Weight/feel: Medium-light forged blank; balanced through the shank instead of tip-heavy.
Why it matters
ATS-314 is Hitachi/Proterial’s flagship cobalt-enriched stainless. Fine carbides and a tight martensitic grain let convex hamaguri edges feel almost glassy. Stylists get a blade that tolerates high-speed slide work without dragging, provided tension stays right. Compared with 440C, ATS-314 carries more molybdenum, so the edge keeps its bite deeper into long color correction days.
ATS-314 is a proprietary steel manufactured exclusively by Proterial (formerly Hitachi Metals). It is not a JIS-designated grade.
Shear pairing & edge compatibility
- Convex 5.5–6.0 in cutters: Ideal for dry detailing and precision bob work where a polished close is non-negotiable.
- High-tooth texturizers: Cobalt matrix keeps blender teeth crisp, preventing grab when carving weight lines.
Technique map
- Slide and point cutting on dense sections that punish softer steels.
- Dry refinement, face-framing, and fringe detailing where zero push lets you work faster.
- Interior channeling/texturizing on lived-in shapes that demand quiet, controlled closures.
Real-world stress tests
- Edge retention: Plan on roughly 1,200–1,600 salon cuts (~6–8 weeks at 25 cuts/day) before a pro tune-up; Japan Scissors notes that cobalt-rich steels like ATS-314 require far fewer sharpenings than mid-tier alloys.
- Impact/drop resilience: The cobalt content favours rigidity; dropped points tend to micro-chip before they bend. A neutral pivot and padded holster are mandatory in busy suites.
- Weight & in-hand feel: Forged blanks land around 7.8 g/cm³ density. In hand that reads as neutral—enough substance to steady long strokes without fatiguing thumb tendons.
Maintenance notes
Daily wipe-down and a tiny pivot oil keep the edge chemistry stable after chemical services. Reset tension weekly; ATS-314 hates creeping drag. Schedule sharpening with an ATS-capable tech twice per year and specify a mirror convex re-polish so the alloy’s low-friction glide returns to spec.
Industry snapshot
- Mizutani Sword Series: uses ATS-314 billets to achieve the iconic silky close long-form educators rave about.
Provenance: VG-10W + (SECRET)
Yamamoto Scissors (山村刃物製作所) — one of the most important steel suppliers to the Japanese scissors industry — documents ATS-314’s composition as “V金10W + (SECRET).” This confirms that ATS-314 is a proprietary modification of Takefu’s VG-10W alloy with undisclosed additional elements.
Only Proterial (formerly Hitachi Metals) can manufacture steel bearing the ATS-314 designation. The specific modifications are trade secrets, but the VG-10W base means ATS-314 shares VG-10’s core characteristics (carbon ~1%, chromium ~15%, cobalt, vanadium, molybdenum) with tungsten and unknown proprietary additions.
Yamamura Manufacturing (山村刃物製作所) of Tsubame-Sanjo, Niigata — who introduced 440C stainless to the Japanese scissors industry and developed the ATS-314 specification — produces their own finished scissors under the KEIUN (慶雲) brand using this steel directly from the source.
Sources: Yamamoto Scissors — Proterial Composition Table; Proterial — ATS-34 Product Page
How it compares
| Steel | HRC | Corrosion | Edge Retention | Sharpening | Price Tier |
|---|---|---|---|---|---|
| ATS-314 | 60–62 | Very good | Excellent | Difficult | Premium |
| VG-10 | 59–63 | Very good | Very good | Moderate | Mid–Premium |
| ATS-34 | 60–61 | Good | Very good | Difficult | Mid–Premium |
| Nano Powder Metal | 62–65 | Excellent | Outstanding | Specialist | Ultra |
| 440C | 58–60 | Good | Good | Moderate | Mid |
Trade-offs
- Premium billet price and forging time keep shears firmly in the high-ticket bracket.
- Brittle if misaligned—DIY sharpening or twisting the blades together can crater the edge.
- Requires convex-capable service benches; generic grinders will burn the micro-carbide structure.
Sources
- Japan Scissors – Hair Scissor Steel & Materials Guide
- Artec Scissors – Steel Characteristics
- Yamamoto Scissors — Proterial Composition Table
- Proterial — ATS-34 Product Page
Related: Edge Types • Steel Types • Scissor Maintenance
Verified Sources
- Secondary Japan Scissors USA (direct sales)
- Primary Yamamoto Scissors — Official (manufacturer official)
- Primary Proterial / Yasugi Specialty Steel (旧日立金属・安来鋼) (manufacturer official)
Frequently Asked Questions
Standard stainless tops out around 60–62 HRC. ATS-314 at 64 HRC goes further, made possible by alloying techniques that refine carbide structure at the edge. The result is a blade that holds its geometry through long cutting sessions and stays sharp through work that would blunt lower-hardness steels faster.
The service window on ATS-314 at 64 HRC runs longer than most mid-grade steels — every 12–18 weeks in normal salon use. Each time ATS-314 needs attention, the choice of sharpener matters; this hardness requires diamond or CBN wheels, not standard abrasives, to restore the edge geometry without shortening blade life.
At 64 HRC, ATS-314 is a choice for working professionals who have outgrown mid-range tools and want longer intervals between services. The alloy supports the full convex grind that skilled cutters rely on for slide cutting and detailed tapering — techniques where blade geometry matters more than cutting speed.
Comments & questions
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