UNS C46400 Naval Brass Copper Alloy

 

 

UNS C46400 Naval Brass, also called C46400 Brass, Naval Brass 464, CZ112, or EN CW712R, is a high-performance copper-zinc-tin alloy engineered for marine and corrosive environments. It combines excellent seawater corrosion resistance, dezincification resistance, and good mechanical strength with high formability.

This marine grade brass alloy is available in various product forms including:

Round bars, square bars, hex bars

Plates and sheets

Tubes and pipes

Standards & Specifications:

ASTM B21 – Rods and Bars

ASTM B171 – Plates and Sheets

AMS 4611 / AMS 4612 – Aerospace-grade

EN CW712R – European equivalent

Applications: Used widely for marine hardware, fasteners, valves, condenser plates, heat exchanger components, propeller shafts, and aerospace hardware.

Keywords / Standard Terms Included: UNS C46400, C46400 Brass, Naval Brass 464, CZ112, EN CW712R, marine grade brass, copper-zinc-tin alloy, ASTM B21, ASTM B171, AMS 4611/4612, round bar, square bar, hex bar, plate, sheet, tube, fasteners, valves, heat exchanger, marine hardware.

Element	Typical / Range
Copper (Cu)	59.0 – 62.0%
Zinc (Zn)	36.3 – 40.5%
Tin (Sn)	0.5 – 1.0%
Lead (Pb)	≤ 0.2%
Iron (Fe)	≤ 0.10%
Others / Residuals	Balance

Physical Properties:

Density: 8.41 g/cm³

Melting Range: 1630 – 1650°F (890 – 900°C)

Thermal Conductivity: ~116 W/m·K

Electrical Conductivity: ~26% IACS

Coefficient of Thermal Expansion: 21.2 µm/m·°C

Mechanical Properties: (depends on temper)

Tensile Strength: 379 – 607 MPa (55,000 – 88,000 psi)

Yield Strength: 172 – 455 MPa (25,000 – 66,000 psi)

Elongation: up to 50%

Modulus of Elasticity: 117 GPa

Machinability: ~30% of free-cutting brass

1. Round Bar (ASTM B21 / AMS 4611)

Diameter (inch)	Diameter (mm)	Standard Length	Typical Temper	Application
3/16″	4.76 mm	3 m / 12 ft	H02 / H04	Small fasteners, bushings
1/4″	6.35 mm	3 m / 12 ft	H02	Screws, pins, spacers
3/8″	9.52 mm	3 m / 12 ft	H02	Marine hardware parts
1/2″	12.7 mm	3 m / 12 ft	H02	Shafts, fittings
3/4″	19.05 mm	3 m / 12 ft	H04	Propeller shafts, turnbuckles
1″	25.4 mm	3 m / 12 ft	H04	Valve stems, structural rods
1-1/2″	38.1 mm	3 m / 12 ft	H04	Heavy hardware, connectors
2″–12″	50.8 – 304.8 mm	3 – 6 m	H04 / M	Machined components, ship parts

 

2. Square Bar (ASTM B21)

Side (inch)	Side (mm)	Standard Length	Application
1/4″	6 mm	3 m	Machine parts
1/2″	12 mm	3 m	Connector blocks
3/4″	19 mm	3 m	Marine hardware
1″–4″	25 – 100 mm	3 – 6 m	Valve components, structural uses

 

3. Hex Bar (ASTM B21)

Across Flats (inch)	Across Flats (mm)	Standard Length	Application
1/4″	6 mm	3 m	Bolts, nuts, fasteners
3/8″	9.5 mm	3 m	Precision machined fittings
1/2″ – 2″	12.7 – 50.8 mm	3 m / 12 ft	Valve stems, connectors
Up to 8″	203 mm	Custom	Large marine assemblies

 

4. Plate & Sheet (ASTM B171) 

Thickness (inch)	Thickness (mm)	Width	Length	Typical Finish	Application
1/16″	1.6 mm	610 – 1220 mm	1220 – 2440 mm	Mill Finish	Decorative marine panels
1/8″	3.2 mm	610 – 1500 mm	2000 – 3000 mm	Smooth / Brushed	Heat exchanger plates
1/4″	6.4 mm	610 – 1524 mm	2000 – 3000 mm	Mill Finish	Structural plates
1/2″ – 2″	12.7 – 50 mm	Up to 1524 mm	2440 – 3658 mm	Hot rolled	Heavy-duty marine bases

Tolerance (typical):

Thickness ± 0.005–0.015″ (0.13–0.38 mm)

Width ± 0.03–0.06″ (0.76–1.5 mm)

Length ± 0.12–0.25″ (3–6 mm)

 

5. Strip / Foil (ASTM B19 / B36)

Thickness	Width	Coil Weight	Application
0.010″ – 0.125″ (0.25 – 3.2 mm)	10 – 300 mm	50 – 250 kg	Sealing gaskets, flexible marine fittings, shielding

 

6.Seamless Tube / Pipe (ASTM B111 / B139)

OD (inch)	OD (mm)	Wall Thickness (inch/mm)	Length	Application
1/4″	6.35 mm	0.028″ (0.7 mm)	3 m	Condenser tubing
1/2″	12.7 mm	0.035″ (0.9 mm)	3 m	Cooling systems
1″	25.4 mm	0.065″ (1.65 mm)	3 m	Heat exchangers
2″	50.8 mm	0.120″ (3.0 mm)	3–6 m	Marine pipelines
4″–6″	102 – 152 mm	0.25″ (6.35 mm)	6 m custom	High-flow transfer systems

 

7. Forged / Custom Shapes (AMS 4611 / 4612)

Form	Custom Range	Typical Application
Forged bar / block	As per drawing	Aerospace, ship propeller hubs, high-stress marine components
Custom extrusion	10 – 300 mm profile width	Decorative or structural marine extrusions
Machined parts	Based on specification	OEM & high-precision components

 

 

Marine hardware: propeller shafts, turnbuckles, deck fittings

Fasteners: bolts, nuts, rivets in marine environments

Valves and stems for offshore, oil & gas, and marine systems

Heat exchanger and condenser plates, baffles

Aerospace and defense hardware requiring corrosion resistance

Q1: Why choose C46400 Naval Brass over 60/40 brass?
A: Tin (0.5–1%) enhances dezincification and seawater corrosion resistance, making it superior for marine applications.

Q2: Is C46400 suitable for saltwater exposure?
A: Yes, it resists zinc leaching and corrosion in marine environments.

Q3: What tempers are available?
A: H02 (half-hard), H04, etc. Strength and elongation vary with temper.

Q4: Is it lead-free?
A: Typically ≤0.2% Pb; some variants marketed as lead-reduced or "lead-free".

Q5: What fabrication methods are suitable?
A: Hot working (forging, forming) is excellent; cold working is fair; machining requires proper tool selection.

Q6: What sizes and product forms are available?
A: Round, square, hex bars, plates, sheets, and tubes in ASTM / EN standard sizes.

 

 

 

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