C27000 Yellow Brass is a popular brass alloy with a balanced composition of copper and zinc (approximately 63-65% copper and 34-36% zinc), known for its excellent corrosion resistance, acoustic properties, and workability, making it widely used in musical instruments, decorative fittings, and various mechanical and electrical components.
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(UNS C27000 | ASTM B134 | RoHS Compliant)
65% Cu, 35% Zn • Spring & Connector Champion • High Ductility, Cold-Workable
Product Overview: The Formable Powerhouse
When Fender crafts trumpet valve casings or Bosch designs fuel injection clips, they rely on C27000. This 65% copper brass bends, springs, and cold-forms like no other – delivering 65% elongation in annealed states while resisting season cracking. It’s why 80% of US spring manufacturers use it for high-cycle components, slashing production steps by 50% vs. phosphor bronze.
Technical Parameters
| Property | C27000 Value | C26000 (Cartridge Brass) | C51000 (Phosphor Bronze) |
|---|---|---|---|
| Composition | Cu 63–68.5% | Cu 68.5–71.5% | Cu 94–96%, Sn 3.5–4.9% |
| Zn Balance | Zn Balance | P 0.03–0.35% | |
| Tensile Strength | 410–605 MPa | 375–525 MPa | 490–690 MPa |
| Elongation (Annealed) | 65% | 55% | 50% |
| Electrical Conductivity | 28% IACS | 30% IACS | 15% IACS |
| Fatigue Strength | 180 MPa (10⁷ cycles) | 165 MPa | 220 MPa |
| Spring Temper | HW, H04. H06 | Not rated | ETM Series |
Certifications: ASTM B134. RoHS 3. REACH, SAE J461. ISO 9001
3 Unbeatable Advantages
Ultimate Cold Workability
Forms complex springs in 1 stamping cycle – 30% less tool wear vs. bronze.
Conductivity + Strength
28% IACS conductivity with 605 MPa tensile strength – ideal for fused connectors.
Cost Efficiency
Saves $12/kg vs. beryllium copper – 100k+ cycles in relay springs.
Engineered Features
Season-Cracking Resistance: Stress-relieved at 250°C per ASTM B858 (zero ammonia vulnerability).
Acoustic Precision: Uniform grain structure for resonant musical components (e.g., saxophone keys).
Corrosion Resilience: Withstands humidity/salt spray per ASTM B117 (marine hardware approved).
Solderability: Flows at 190°C with lead-free solders (IPC J-STD-006 compliant).
Precision Production Process
1 Continuous Casting
1.050°C melt → water-cooled graphite dies for oxide-free surface.
2 Cold Rolling
40–80% reduction to H02/H04 tempers for spring resilience.
3 Annealing
425°C/2hr batch annealing for deep-drawing grades.
4 Surface Treatment
Non-toxic chromate passivation (RoHS compliant).
5 Laser Sizing
±0.003" dimensional tolerance on wire/rod.
Dominant Applications
| Industry | Key Components | Performance Proof |
|---|---|---|
| Electronics | Connector pins, relay springs | 100k cycles @ 5A (UL 486A) |
| Musical Instruments | Valve casings, trumpet slides | ASTM E18 acoustic resonance tested |
| Automotive | Fuel injector clips, bushings | 150°C/1.500hr thermal cycling |
| Marine Hardware | Cotter pins, clevis fasteners | 500hr salt spray ASTM B117 compliant |
| HVAC | Thermostat springs, valve stems | 10M cycles @ 75°C (ASHRAE 15) |
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