SinoDiam CBN Series: Which One Is Right for Your Metal Grinding

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🧠 SinoDiam CBN Series: Which One Is Right for Your Metal Grinding?

If you grind metal—steel, stainless steel, cast iron, or hardened alloy—and keep hearing “CBN this” or “CBN that,” you’re probably wondering:
👉 What’s the difference between all these CBN grades?
👉 Which one do I actually need for my tools and materials?

We get it. Choosing the wrong CBN (Cubic Boron Nitride) abrasive can mean dull grinding wheels, scratched surfaces, or wasted money.
That’s why we made this simple, no-jargon guide to our SinoDiam CBN series (A10 / A20 / B10 / B20) — to help you pick the right grade in 2 minutes.

🔍 What Is CBN (Cubic Boron Nitride)?

CBN is short for Cubic Boron Nitride, a super-hard crystal second only to diamond.
It’s made for grinding ferrous metals—steel, tool steel, cast iron, stainless steel, and other iron-based alloys—where diamond abrasives fail due to chemical wear.

Because CBN stays sharp under heat and pressure, it lasts much longer and keeps your grinding wheels performing consistently.

SinoDiam’s CBN series includes four specialized grades, each built for a different level of performance:

  • A10: Budget-friendly, self-sharpening CBN for basic steel grinding.
  • A20: Versatile multi-bond CBN for different metals and tools.
  • B10: Friable fine CBN for ultra-smooth surface finishing.
  • B20: Blocky high-toughness CBN for high-temp and high-speed grinding.

☕ Let’s Break Down Each SinoDiam CBN Grade (Simple & Practical)

🟠 CBN-A10: Budget-Friendly CBN for Basic Steel Grinding

Color: Amber
Shape: Irregular, self-sharpening

Best For:
Entry-level grinding of carbon steel, tool steel, and general ferrous materials using resin bond wheels.

Why It Works:

  • Affordable & effective: Low cost, high efficiency.
  • Self-sharpening edges: Keeps wheels cutting sharp longer.
  • Perfect for small shops or workshops grinding everyday metal parts.

Example:
A small metal shop uses CBN-A10 resin bond grit to sharpen carbon steel blades—grinds 15% more pieces per wheel cycle.

✅ Hot Keywords:
CBN-A10, resin bond CBN abrasive, CBN for carbon steel, affordable CBN powder, cubic boron nitride grit for metal tools

🟡 CBN-A20: Multi-Bond Versatile CBN for Mixed Metals

Color: Amber
Shape: Regular, uniform

Best For:
Grinding stainless steel, tool steel, and ferrous alloys across multiple bonds—vitrified, metal, or electroplated.

Why It Works:

  • Multi-bond compatibility: One CBN for all your wheels.
  • High toughness: Handles high pressure without fracturing.
  • Ideal for medium to large factories with diverse metal processing lines.

Example:
An auto parts maker uses CBN-A20 in vitrified wheels for stainless parts and in electroplated tools for tool steel—reducing inventory and improving consistency.

✅ Hot Keywords:
CBN-A20, vitrified bond CBN, metal bond CBN, electroplated CBN, CBN for stainless steel, CBN for tool steel

⚫ CBN-B10: Fine Friable CBN for Ultra-Smooth Finishing

Color: Deep black
Shape: Irregular and friable (easily fractured)

Best For:
Fine grinding and polishing of precision parts—tool steel dies, gears, and engine components—with resin bond tools.

Why It Works:

  • Friable structure: Breaks into micro-sharp edges for mirror finishes.
  • Smooth performance: Achieves Ra ≤0.8μm on ferrous metals.
  • Perfect for precision industries: Automotive, aerospace, and toolmaking.

Example:
A mold manufacturer switched to CBN-B10 for fine grinding—achieved scratch-free surfaces with 10% less polishing time.

✅ Hot Keywords:
CBN-B10, black friable CBN, fine grinding CBN, resin bond CBN powder, CBN for precision finishing, mirror finish CBN

⚫ CBN-B20: High-Toughness Blocky CBN for Industrial Grinding

Color: Bright black
Shape: Blocky mono-crystalline

Best For:
High-speed, high-temperature grinding of hardened steel (HRC 50+), cast iron, and high-alloy ferrous metals.

Why It Works:

  • Thermal stability: Handles up to 1,300°C without losing strength.
  • High toughness: Ideal for heavy-duty industrial operations.
  • Extended tool life: Lasts 40% longer than standard CBN in cast iron grinding.

Example:
A heavy machinery plant uses CBN-B20 in metal bond wheels for cast iron engine blocks—doubling tool life while maintaining Ra ≤1.0μm finishes.

✅ Hot Keywords:
CBN-B20, blocky CBN, high temperature CBN, CBN for hardened steel, CBN for cast iron, industrial CBN abrasive, cubic boron nitride powder

🧩 Quick Comparison: Which CBN Grade Fits Your Job?

Your Grinding JobRecommended GradeKey Benefit
Basic steel grinding (resin bond)CBN-A10Budget-friendly, self-sharpening.
Multiple bonds or mixed metalsCBN-A20One CBN for all bonds and materials.
Fine surface finishingCBN-B10Friable, ultra-smooth results.
Heavy-duty or high-speed grindingCBN-B20Tough, heat-resistant, long-lasting.

❓ CBN FAQ: Fast Answers for Toolmakers

Q1. Can CBN grind non-ferrous metals like aluminum or copper?
A: No. CBN is best for ferrous materials (metals with iron). For non-ferrous metals, use SinoDiam synthetic diamond powders like SND-M10 Micron Diamond Powder.

Q2. What mesh size should I choose?
A:

  • Coarse grinding: 50/60–80/100 mesh
  • General grinding: 120/140–230/270 mesh
  • Fine finishing: 325/400 mesh

Q3. Can I get a CBN sample before ordering?
A: Absolutely! SinoDiam provides free 1kg CBN samples for evaluation. Contact us to test performance in your resin, metal, or vitrified bond tools.

🚀 Get the Right CBN for Your Metal Grinding

Whether you’re polishing small steel parts or machining hardened alloys under extreme heat, SinoDiam’s CBN series has the right grade for you.
Each product is engineered for consistent particle shape, toughness, and bond compatibility—ensuring superior grinding performance and cost-efficiency.

👉 Request your free sample today or visit our CBN Product Page to explore all grades.

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