UNS C46400 Naval Brass Copper Alloy

Naval Brass is a 60:40 copper-zinc alloy to which about 1% of tin has been added to improve the corrosion resistance, particularly to dezincification. The alloy is a two-phase alpha-beta brass, hence has reasonably high strength with lower ductility than the single-phase 70:30 or alpha brass. It is used for structural applications and for forgings, especially where contact with seawater is likely to induce corrosion. The mechanical properties are almost indistinguishable from those of 60:40 brass C28000, although the tin addition tends to give slightly higher strength.

Equivalent Grade: CnZn38Sn1As, CnZn38Sn1, 2.0530, C4640

C46400 can be readily hot worked, and can also be cold worked, but not as easily as the single-phase alpha brasses.

UNS C46400 Plate Dimension:

Alloy process Size(mm)
Thickness Width Length
C46400 Hot rolling 4.0~8.0 600~2000 ≤4000
>8~60 600~3000 ≤6000
Cold rolling >3.0~10 ≤2500 ≤4000

UNS C46400 Chemical Composition

Cu(1) Pb Sn Zn Fe
(1) Cu + Sum of Named Elements 99.6% min.
Min (%) 59.0 0.50
Max (%) 62.0 0.20 1.0 Rem 0.10

Corrosion Resistance
C46400 has good corrosion resistance to weathering and good resistance to many types of water. It can resist the dezincification in seawater which may be encountered with plain 60:40 brass, C28000.
Low-copper alloys, such as naval brass appear to form thin, adherent surface films of corrosion products which are moderately protective.
C46400 is not suitable for applications in ammonia, ammonia compounds or amines environments, as it may suffer stress corrosion cracking. It may also suffer stress corrosion cracking in atmospheric exposures.

The machinability rate of UNS C46400 brass-copper alloys is 30.

Soldering, brazing, oxyacetylene welding, gas shielded arc welding, spot welding, seam welding, and butt welding are considered as suitable welding processes, whereas we don’t recommend coated metal arc welding for UNS C46400 alloys.

The hot forge ability rating of UNS C46400 is 90 with the preferred hot working temperature being between 649 and 816°C (1200 and 1500°F).

Hot Working
The hot working capacity of UNS C46400 alloys is very excellent.

Cold Working
The UNS C46400 alloys have a fair cold working capacity.

The annealing temperature of the UNS C46400 alloys is between 427 and 593°C (800 and 1100°F).

Available Products Forms:
Strip: FEDERAL QQ-B-639, SAE J461, J463
Sheet: ASTM B171 / B171M, FEDERAL QQ-B-639, JIS H3100:1992
Rod: ASTM B21 / B21M, ASTM B124 / B124M, SAE J461, J463
Profile: ASTM B21 / B21 M, ASTM B124 / B124M
Forgings: ASTM B283

Builders Hardware: Lock Pins
Electrical: Precision Shipboard Equipment
Fasteners: Bolts, Nuts, Rivets
Industrial: Aircraft Turn buckle barrels, Balls, Bearings, Condenser plates, Dies, golf ball production, Heat exchanger tube, Hub Cones, Pressure Vessels, Structures, Valve Stems
Marine: Decorative Fittings, Hardware, Propeller shafts, shafting, Turn buckles
Ordnance: Missile components