C35000 Brass

Grade Name

• UNS Number: C35000

• Common Name: Leaded Brass (CuZn39Pb)

• Corresponding Standards: ASTM B453 (Leaded Brass Rod/Bar), ASTM B121 (Leaded Brass Sheet/Strip), DIN 17671-1.

Product Features

• Superior Machinability: Lead content (1.5–2.5%) ensures excellent chip-breaking and reduced tool wear.

• High Corrosion Resistance: Suitable for atmospheric, freshwater, and mild marine environments.

• Balanced Strength-Ductility: Tensile strength up to 550 MPa with elongation up to 50%.

• Cost-Effective: Lower copper content (58–62%) reduces material costs.

• Thermal Conductivity: Ideal for heat exchanger components.

Common Product Forms & Dimensions

Form	Thickness (mm)	Width (mm)	Length (mm)	Diameter (mm)
Sheet/Strip	0.3 – 6.0	50 – 600	Custom	–
Rod/Bar	–	–	Custom	5 – 100
Wire	–	–	Custom	0.5 – 12
Tube	1.0 – 15.0 (wall)	–	Custom	15 – 250 (OD)
Note: Custom dimensions are available upon request.

Chemical Composition

Element	Cu	Zn	Pb	Fe	Others
Weight %	58–62	Balance	1.5–2.5	≤0.15	≤0.5 (total impurities)
Complies with ASTM B453 and DIN 17671 standards.

Physical Properties

Property	Value
Density (g/cm³)	8.45–8.50
Melting Point (°C)	890–910
Electrical Conductivity (%IACS)	22–26 (Annealed)
Thermal Conductivity (W/m·K)	105–118 (at 20°C)
Values vary with processing conditions.

Mechanical Properties

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HV)
Annealed	320–450	120–200	35–50	60–90
Cold Worked (H02)	450–550	350–420	15–25	100–140
Hard (H04)	≥550	≥450	≥5	≥150
Data applies to standard thicknesses and processing states.

Core Advantages

1. Free-Machining: Ideal for high-speed CNC and automatic machining.

2. Durability: Resists wear and corrosion in humid environments.

3. Versatility: Compatible with hot forging, cold forming, and welding.

4. Cost Efficiency: Optimized for mass production in automotive and electronics industries.

Product Applications

• Automotive: Radiator cores, fuel injectors, and stamped components.

• Electronics: Connectors, terminals, and shielding parts.

• Plumbing: Valve bodies, fittings, and pump components.

• Industrial: Gears, bushings, and fasteners.

• Marine: Non-critical seawater components (with coatings).

Processing Considerations

• Annealing: 500–650°C for 1–2 hours to restore ductility after cold working.

• Machining: Use sharp carbide tools with lubricants to minimize galling.

• Welding: TIG welding with inert gas shielding; avoid overheating to prevent lead vaporization.

• Surface Treatment: Electroplating or passivation for enhanced corrosion resistance.

Key Application Scenarios

• High-precision automotive parts requiring tight tolerances.

• Electrical connectors in consumer electronics.

• Marine hardware in low-salinity environments.

• Industrial fasteners and hydraulic components.

FAQs

Q1: Is C35000 suitable for drinking water systems?

A: Limited use due to lead content; ensure compliance with local regulations (e.g., NSF/ANSI 61).

Q2: How does C35000 compare to C36000 brass?

A: C35000 has lower lead content (2.5% max vs. 3.7% in C36000), offering better environmental compliance but slightly reduced machinability.

Q3: Can C35000 be recycled?

A: Yes, but specialized recycling processes are required to manage lead content safely.

Standard References

Standard	Description
ASTM B453	Leaded brass rod, bar, and shapes.
ASTM B121	Leaded brass sheet and strip.
DIN 17671-1	Specifications for wrought copper alloy tubes.
SAE J463	Mechanical property standards for wrought copper alloys.

Note: Specifications may vary slightly depending on manufacturer and processing methods. Always consult technical datasheets for critical applications.