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Naval brass C46400 is nominally composed of 60% copper, 39.2% zinc and 0.8% tin. As is typical of brass alloys with the duplex alpha + beta structure, C46400 has good strength and rigidity. By substituting tin for an equal quantity of zinc, a high corrosion resistance to seawater is achieved. The addition of tin also gives the alloy an inherent resistance to dezincification, thereby further inhibiting the impingement by seawater at higher than normal temperatures. The alloy is also noted for its resistance to wear, fatigue, galling, and stress corrosion cracking.

Characteristics

Hot Working and Cold Working

C46400 has excellent hot workability and fair cold workability. Characteristically, it becomes extremely plastic when hot, and is well adapted to any hot working process including hot forging and pressing, and hot heading and upsetting. It can be cold worked to a moderate degree using processes such as blanking, drawing, forming, bending, shearing, heading and upsetting.

Joining

Joining by soldering and brazing is excellent; by oxyacetylene welding, good; and by gas shielded arc welding, fair.

Typical Uses

Considered the most widely used of the tin brasses, C46400 rod is used to fabricate a variety of nuts, bolts, rivets, bearings, bushings, lock pins, valve stems, pump and propeller shafts, and marine hardware.


 

Product Properties

Chemical

Trade Name
Naval Brass, uninhibited
Cu
59.0-62.0
Fe
0.1
Pb
0.2
Sn
.5-1.0
Zn
Rem.

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Mechanical

Form
Flat Product
Flat Product
Flat Product
Flat Product
Flat Product
Rod
Rod
Rod
Rod
Rod
Rod
Rod
Rod
Rod
Rod
Rod
Size
Temper
Tensile Strength, ksi
Yield Strength, ksi
Elongation in 2 Inches, %
0.04
Light Anneal
62
30
40
0.04
Quarter Hard
70
58
17
0.25
Soft Anneal
58
25
49
0.25
Light Anneal
60
28
45
1
As Hot Rolled
55
25
50
0.25
Light Anneal
63
30
40
0.25
Quarter hard (10%)
70
48
25
0.25
Soft Anneal
58
27
45
0.25
Half Hard (20%)
80
57
20
1
Light Annealed
63
30
40
1
Quarter Hard (8%)
69
46
27
1
Soft Anneal
57
25
47
2
Light Anneal
62
28
43
2
Soft Anneal
56
25
47
2
Quarter Hard (8%)
67
40
35
1
Half Hard (20%)
75
53
20

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Physical

Melting Point, Liquidus (°F)
1650
Melting Point, Solidus (°F)
Density, 68°F (Lb/In³)
Coefficient Of Linear Thermal Expansion, 68 - 572°F (x 10⁻⁶/°F)
Thermal Conductivity, 68°F (Btu/Ft²/Ft/Hr/°F)
Electrical Conductivity, Annealed, 68°F (%IACS)
Specific Heat, 68°F (Btu/Lb/°F)
1630
0.304
11.8
67
26
0.09

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Fabrication

Machinability Rating (Free Cutting Brass = 100)
30
Soldering
Brazing
Oxyacetylene Welding
Gas Shielded Arc Welding
Coated Metal Arc Welding
Spot
Seam
Butt
E
E
G
F
NR
G
F
G

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E = Excellent
G = Good
F = Fair
NR = Not Recommended

Machinability ratings must be recognized as approximate values. They are a reasonable guide to relative tool life and power required for cutting. Variables of speed, cutting oil, feed, and depth of cut will significantly affect these ratios.

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