The Rise of Powder Metallurgy in Professional Scissors
Powder metallurgy (粉末冶金技術 / funmatsu yakin gijutsu, abbreviated PM) steels are rapidly establishing themselves as the premium tier in professional scissors. While conventional steels like VG-10 and GIN3 remain excellent choices for most professionals, PM steels offer measurable advantages at the highest performance levels.
What Makes Powder Metallurgy Different
In conventional steelmaking, molten metal is cast into ingots and then worked into shape. This process inevitably produces some unevenness in the distribution of carbides — the hard particles within the steel matrix that determine edge retention and wear resistance. Larger or unevenly distributed carbides create weak points in the blade edge.
Powder metallurgy takes a fundamentally different approach. Molten steel is atomised into a fine powder, with each particle containing a uniform distribution of alloying elements. This powder is then consolidated under extreme heat and pressure. The result is a steel with a remarkably uniform microstructure — carbides are smaller and more evenly distributed than anything achievable through conventional melting.
For scissors, this translates to edges that are more consistent along their entire length and maintain sharpness more uniformly over time.
The Key Players
Takefu Special Steel SG2/R2 (Super Gold 2) is the most widely adopted PM steel in professional scissors. Its composition — carbon 1.25-1.45%, chromium 14-16% — achieves a working hardness of HRC 63-64. Joewell’s FX PRO series is among the most prominent scissors built on SG2, offering a reference point for what this steel can deliver in a well-made tool.
Mizutani Nano Powder Metal takes the technology further. Developed in collaboration with the University of Tokyo, Mizutani’s process uses Hot Isostatic Pressing (HIP) — consolidating the steel powder under simultaneous high temperature and gas pressure from all directions. The company claims their finished blades are “free of impurities under microscope,” and independent examination supports the claim of an exceptionally clean microstructure.
Hayashi HYS Steel represents perhaps the most ambitious application. Their proprietary ultra-fine particle PM steel achieves a standard working hardness of HRC 63-64, comparable to SG2. But their HYS-MAX67 variant pushes to HRC 67 — an industry first for professional scissors. At that hardness, edge retention is extraordinary, though the trade-off is increased brittleness that demands careful handling.
The Practical Question
For working stylists, the relevant question is whether PM steel justifies its significant price premium. The answer depends on volume. A stylist performing 15-20 cuts per day will notice longer intervals between sharpening and a more consistent cutting feel over time. For lower-volume professionals, a well-made VG-10 or GIN3 scissor may deliver everything they need at a considerably lower price point.
What PM steel does not do is compensate for poor manufacturing. A badly ground or poorly heat-treated PM scissor will underperform a well-made conventional steel scissor every time. The steel is only as good as the hands that shape it.