When selecting brass fittings, valves, or meter components, cryptic codes like C27000, H65, and DZR appear on spec sheets. These aren't random characters – they're the material's "ID card" revealing critical performance secrets. As a brass manufacturer, we break down this coding system for smarter procurement decisions.
1. C27000 (65 Copper): The All-Rounder
Composition
·Copper (Cu): 65% ±0.5%
·Zinc (Zn): Balance
·Trace Elements: Lead ≤0.09% (RoHS compliant)
Why Engineers Choose It
✅ Cost-Performance Balance: Ideal for general plumbing, HVAC, and low-pressure gas lines
✅ Machinability Rating: 80% (vs. 100% for free-cutting brass) – balances ease of fabrication with strength
⚠️ Limitation: Avoid in seawater/pH<6.5 environments due to dezincification risk
Real-World Use Case:
"In residential water systems, C27000 elbows reduce installation costs by 15% vs. specialty alloys while meeting ASME B16.18 pressure ratings."
2. H65 (Euro Standard Equivalent: CW509L)
Decoding the "H"
·H = Huangtong (Chinese for brass)
·65 = Copper content percentage (65%)
Key Differences from C27000
| Property | H65 | C27000 |
|---|---|---|
| Yield Strength | ≥145 MPa | ≥110 MPa |
| Elongation | ≥40% | ≥30% |
| Primary Use | Structural parts | Plumbing joints |
Pro Tip: Specify H65 for vibration-prone applications (e.g., pump connectors) where fatigue resistance is critical.
3. DZR Brass: Corrosion Warrior
Science Behind the Code
·DZR = Dezincification Resistant
·Secret Weapon: 0.02-0.15% Arsenic (As) creating zinc-oxide barrier
Performance Data
mermaid
复制
graph LR A[Standard Brass] -->|Acidic Water| B[Zn Leaching → Weakness] C[DZR Brass] -->|Same Conditions| D[Stable Crust Layer → Protection]
Certification Marks to Trust
·UK： WRAS Approval (Water Regulations Advisory Scheme)
·USA： NSF/ANSI 61 Certification
·EU： EN 12449:2020 Compliance
Brass Selection Cheat Sheet
| Scenario | Recommended Alloy | Critical Spec Check |
|---|---|---|
| Drinking Water Systems | DZR (C69300) | Lead content ≤0.25% |
| High-Vibration Machinery | H65 | Fatigue strength >150 MPa |
| Cost-Sensitive Projects | C27000 | ASTM B16 pressure rating |
| Marine Environments | Naval Brass (C46400) | Salt spray test >500 hrs |
Why This Matters to You
"Misreading alloy codes caused a German plant shutdown when C27000 valves failed in acidic coolant lines. Correct DZR specification saved €217,000/year in replacements." – Plant Engineering Report, 2025
Free Resource: Download our Brass Alloy Decoder Wheel at [YourCompany.com/TechHub] to instantly match codes to applications.
Key Standards Quick Reference
·🇺🇸 ASTM B16: Standard for Free-Cutting Brass Rod, Bar and Shapes
·🇪🇺 EN 12164: Copper and copper alloys - Rod for free machining purposes
·🌍 ISO 426/1: Wrought copper-zinc alloys - Chemical composition
