SG2 / R2 — Super Gold 2

SG2 / R2 — Super Gold 2

Quick look

• Hardness window: 63–64 HRC from Takefu Special Steel powder metallurgy process.
• Toughness: PM carbide distribution keeps the steel remarkably tough for its extreme hardness.
• Corrosion profile: 14–16% chromium with molybdenum boost; excellent resistance to salon chemicals and humidity.
• Weight/feel: Standard stainless density but with a distinctly crisp, refined closure feel from the uniform carbide matrix.

Why it matters

SG2—スーパーゴールド2 (Sūpā Gōrudo Ni)—is Takefu Special Steel’s flagship powder metallurgy stainless, also marketed as R2. Powder metallurgy (PM) changes everything about how carbides form: instead of the coarse, unevenly distributed carbides found in conventionally cast steels, PM processing atomizes molten steel into fine powder, then consolidates it under heat and pressure. The result is a microstructure with extremely fine, uniformly distributed carbides throughout the matrix. For scissors, this translates directly into edges that are simultaneously harder, tougher, and more polishable than anything achievable through conventional casting at the same carbon content. Joewell uses SG2 in their FX PRO series—a direct statement that this steel competes at the top of the professional shear market.

SG2 is a proprietary powder metallurgy steel developed by Takefu Special Steel (武生特殊鋼材). It is not classified under JIS G 4303.

Composition breakdown

SG2 runs 1.25–1.45% carbon, 14–16% chromium, 2.5–3.0% molybdenum, and 1.8–2.2% vanadium. The high carbon drives the 63–64 HRC hardness ceiling. The generous molybdenum content (far exceeding ATS-34’s ~4%) creates molybdenum carbides that resist wear and add thermal stability. Vanadium at 1.8–2.2% refines the grain structure and creates vanadium carbides that are among the hardest in any stainless alloy. The PM process ensures these carbides are microscopic and evenly spaced rather than clustered—eliminating the weak spots that cause conventional high-carbon steels to chip.

Shear pairing & edge compatibility

• Premium convex 5.5–6.5 in cutters: The uniform PM carbides take and hold a mirror-polished convex edge that glides through dry slide work.
• Joewell FX PRO series: The benchmark pairing—SG2 in a precision-ground convex blade designed for advanced cutting techniques.

Technique map

• Advanced dry slide cutting and channel work where edge keenness must last through marathon editorial sessions.
• Precision point cutting and texturizing where the fine carbide matrix keeps the tip geometry intact.
• High-end salon services where the stylist needs a single tool that performs at the highest level across multiple techniques.

Real-world stress tests

• Edge retention: Expect 1,400–1,800+ salon cuts (~7–10 weeks at 25 cuts/day) before service is needed. The PM carbide distribution significantly outperforms conventional steels at the same hardness—comparable to cobalt alloys but with better corrosion resistance.
• Impact/drop resilience: Better than expected for 63–64 HRC. The PM process eliminates the carbide clusters that act as crack initiation points in conventional steels, so SG2 resists chipping better than its hardness number would suggest. Still, dropping a 64 HRC blade on tile is never advisable.
• Weight & in-hand feel: Standard stainless density around 7.7 g/cm³, but the closure feel is distinctive—crisp, smooth, and almost frictionless thanks to the polished PM surface.

Maintenance notes

Rinse and dry after chemical services; the high chromium and molybdenum handle routine moisture but concentrated bleach or perm solution should not sit on the blade. Oil pivots weekly and maintain neutral tension. Schedule professional sharpening every 4–6 months even in high-volume salons—SG2’s edge longevity means less frequent service, but when it does need work, use a sharpener experienced with PM steels. The fine, hard carbides require proper abrasive selection; aggressive wheels can pluck carbides from the matrix rather than polishing them.

How powder metallurgy works

SG2 (also called R2 or Super Gold 2) is manufactured via powder metallurgy — a fundamentally different process from conventional steelmaking:

1. Conventional steel: Raw materials are melted, mixed, and rolled into sheet. Even with modern technology, achieving perfectly uniform distribution of alloying elements throughout the melt is extremely difficult. Larger carbides and segregation zones can form.

2. Powder metallurgy (PM): Raw materials are reduced to microscopic particles, mixed uniformly, then consolidated under heat and pressure using HIP (Hot Isostatic Pressing). The result is steel with no segregation, no inclusions, and uniform grain structure — which translates to consistent edge performance across the entire blade length.

This is why PM steels like SG2 can achieve HRC 63–64 while maintaining enough toughness for scissors: the uniform particle distribution eliminates the weak points that would cause chipping in a conventional steel at the same hardness.

Mizutani markets their PM scissors as “Nano Powder Metal®” — this is their brand name for the HIP-manufactured ultra-fine powder steel. Their claim that it is “free of impurities under microscope” refers to the elimination of macro-segregation that HIP processing achieves.

Source: Hayashi Scissors — Materials (Japanese); Mizutani Scissors — About page

How it compares

Steel	HRC	Corrosion	Edge Retention	Sharpening	Price Tier
SG2/R2	63–64	Excellent	Excellent	Difficult	Premium
Nano Powder Metal	62–65	Excellent	Outstanding	Specialist	Ultra
VG-10	59–63	Very good	Very good	Moderate	Mid–Premium
HYS (Hayashi)	63–64	Very good	Excellent	Difficult	Premium
ATS-314	60–62	Very good	Excellent	Difficult	Premium

Trade-offs

• Premium pricing—SG2 shears command top-tier prices, reflecting both the steel cost and the precision required to grind PM blanks.
• Demands a PM-experienced sharpener; conventional sharpening techniques can damage the microstructure.
• The extreme hardness means the steel is less forgiving of misuse—lateral torque or prying can crack rather than bend.
• Limited maker availability; not every shear brand has access to Takefu’s PM blanks.

Verified Sources

1. Primary 🌐 Joewell Scissors — Official Japan (manufacturer official)
2. Secondary HairArt International — Joewell USA Distributor (authorized distributor)
3. Primary 🇯🇵 Hayashi Scissors — Official Japan (Japanese)

Frequently Asked Questions

What is SG2 / R2? +

SG2 (Super Gold 2 / R2) is Takefu's flagship PM stainless at 63-64 HRC. Ultra-fine carbides for top-tier professional hair scissor performance.

What is the hardness of SG2 / R2 steel? +

SG2 / R2 has a Rockwell hardness (HRC) range of 63 to 64. This hardness level determines edge retention, sharpening difficulty, and overall blade durability in professional scissors.

Is SG2 / R2 good for professional hair scissors? +

SG2 / R2 is used in professional hair scissors for its balance of edge retention, corrosion resistance, and sharpenability. It is classified as a Premium Powder Metallurgy steel. It originates from Japan. The choice depends on your cutting style, volume, and maintenance preferences.