C28000 Brass

Grade Name

UNS Number: C28000
Common Name: Muntz Metal (60% Cu, 40% Zn)
Corresponding Standards: ASTM B111 (Seamless Condenser Tubes), ASTM B171 (Copper-Alloy Plate/Sheet), SAE J463.

Product Features

High Strength and Durability: Ideal for structural and marine applications.
Excellent Corrosion Resistance: Performs well in seawater and industrial environments.
Good Hot Workability: Suitable for forging and extrusion.
Cost-Effective: Lower copper content reduces material costs.
Thermal Conductivity: Suitable for heat exchanger applications.

Common Product Forms & Dimensions

Form	Thickness (mm)	Width (mm)	Length (mm)	Diameter (mm)
Sheet/Plate	1.0 – 50.0	200 – 2000	Custom	-
Rod/Bar	-	-	Custom	10 – 150
Tube	1.5 – 12.0 (wall)	-	Custom	20 – 300 (OD)
Forging Stock	-	-	Custom	50 – 500
Note: Custom dimensions are available upon request.

Chemical Composition

Element	Cu	Zn	Pb	Fe	Others
Weight %	59–63	Balance	≤0.3	≤0.15	≤0.5 (total)
Complies with ASTM B111 and SAE J463 standards.

Physical Properties

Property	Value
Density (g/cm³)	8.39
Melting Point (°C)	900–905
Electrical Conductivity (%IACS)	27–30 (Annealed)
Thermal Conductivity (W/m·K)	108 (at 20°C)
Values may vary with processing conditions.

Mechanical Properties

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HV)
Annealed	300–400	100–150	40–60	70–90
Cold Worked (H02)	400–500	300–350	15–25	100–130
Hot Rolled	450–550	350–400	10–20	120–150
Data applies to standard thicknesses and processing states.

Core Advantages

1. Marine-Grade Performance: Resists seawater corrosion and biofouling.

2. High Thermal Efficiency: Ideal for condenser and heat exchanger systems.

3. Versatile Fabrication: Compatible with hot forging, extrusion, and welding.

4. Cost Efficiency: Optimized for large-scale industrial applications.

Product Applications

Marine Engineering: Ship hulls, propeller shafts, and seawater valves.
Heat Exchangers: Condenser tubes, radiator cores, and boiler components.
Construction: Architectural cladding, roofing, and decorative trim.
Industrial: Fasteners, bolts, and heavy-duty stamped parts.

Processing Considerations

Hot Working: Forge or extrude at 650–800°C; avoid overheating to prevent zinc loss.
Annealing: 500–600°C for stress relief after cold working.
Welding: Use TIG or MIG welding with inert gas shielding; pre-clean surfaces.
Surface Protection: Apply anti-corrosion coatings for prolonged marine exposure.

Key Application Scenarios

Offshore oil rig components exposed to seawater.
Power plant condenser and heat recovery systems.
Coastal architectural structures requiring corrosion resistance.
Heavy machinery parts in chemical processing plants.

FAQs

Q1: How does C28000 compare to C27000 brass?

A: C28000 has higher zinc content (40% vs. 35%), offering better strength and corrosion resistance but lower ductility.

Q2: Is C28000 suitable for freshwater systems?

A: Yes, it is widely used in plumbing and heat exchangers for freshwater applications.

Q3: Can C28000 be used in high-temperature environments?

A: Limited to temperatures below 200°C; prolonged high heat may degrade zinc content.

Standard References

Standard	Description
ASTM B111	Seamless condenser and heat exchanger tubes.
ASTM B171	Copper-alloy plate and sheet for pressure vessels.
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.

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