Polished scissor blades reflecting light to show steel grain quality

Aichi Steel AUS-8 vs VG-10: Understanding Mid-Range Japanese Steels

· by Marcus Chen

One of the most common questions from stylists upgrading their scissors is whether the jump from AUS-8 to VG-10 steel is worth the price difference. It is a fair question, and the answer requires understanding what each steel actually is and who makes it.

The AUS Series: Aichi Steel Corporation

Aichi Steel Corporation (愛知製鋼), headquartered in Tokai City, Aichi Prefecture, produces the AUS series of stainless steels widely used in Japanese cutlery and scissors. The range spans three main grades:

AUS-6 (6A): Carbon 0.55-0.65%, chromium 13.0-14.5%, HRC 55-56. This is the budget tier. Adequate for student scissors and very light use, but edge retention is limited. Expect to sharpen frequently with daily professional use.

AUS-8 (8A): Carbon 0.70-0.80%, chromium 13.0-14.5%, HRC 57-59. The solid mid-range option. Good toughness, reasonable edge retention, and sufficient hardness for professional work. Many reliable scissors in the $150-$300 range use AUS-8 as their blade steel.

AUS-10 (10A): Carbon 0.95-1.10%, chromium 13.0-14.5%, vanadium 0.10-0.25%, HRC 58-60. Comparable to 440C with a vanadium addition that refines carbide structure. A genuine step up in edge retention from AUS-8, though still below VG-10.

VG-10: The Takefu Standard

VG-10, produced by Takefu Special Steel (武生特殊鋼材) in Fukui Prefecture, is arguably the most recognised premium scissors steel in the world. Its composition — approximately 1.0% carbon, 15% chromium, 1.0% molybdenum, 0.2% vanadium, 1.5% cobalt — delivers HRC 58-62 depending on heat treatment.

The cobalt alloy addition is key. It allows higher hardness without excessive brittleness, meaning VG-10 can hold a finer, keener edge angle than AUS-8 while resisting chipping. The higher chromium content (15% versus 13-14.5%) also provides better corrosion resistance — relevant for scissors exposed to water and chemical treatments throughout the day.

The Practical Difference

On paper, the gap between AUS-8 at HRC 57-59 and VG-10 at HRC 58-62 looks modest. In practice, the difference compounds over a working day. VG-10 maintains its cutting feel — that clean, effortless glide through hair — for significantly longer between sharpenings.

For a stylist cutting six to eight hours daily, this translates to roughly 30-50% longer intervals between professional sharpening services. Over a year, that means fewer disruptions, more consistent cutting performance, and lower total sharpening costs.

The Verdict

For most working professionals, the price premium from AUS-8 to VG-10 justifies itself through superior edge retention and reduced maintenance. AUS-8 remains an excellent choice for secondary scissors, training, or stylists with lighter cutting schedules. But for a primary daily-use scissor, VG-10 earns its reputation as the professional standard.