COPPER ALLOY
DATA SHEET
C71500 & C71520
Nominally composed of 69.5%
copper, 30% nickel, and 0.5% iron, Cupro Nickel 70/30 is the preferred
condenser and salt water tube for vessels of the United States Navy. Here it has proved to be thoroughly reliable
under the most exacting and demanding conditions.
C71500 is known for its
moderate strength, workability, formability, and weldability. The inclusion of controlled quantities of
iron also gives the alloy an extraordinary resistance to general corrosion and
stress corrosion cracking, as well as to erosion and impingement due to
turbulent water containing air bubbles and silt flowing at high
velocities. C71520 is the welding grade
referenced in ASTM and military specifications.
Hot Working:
C71500 has good hot workability.
Cold Working:
C71500 has good cold workability.
Its malleability approaches that of copper, and it does not harden
rapidly. This permits severe drawing and
spinning.
Joining: Joining by
soldering and brazing is excellent, as well as all types of welding. Joining by oxyacetylene welding is good. The filler metal is a specially-alloyed 70/30
copper nickel composition.
Applications:
Designed
to handle stresses, C71500 find its greatest application in areas where high
temperatures and pressures combined with high velocity and destructive
turbulence would rapidly deteriorate many less resistant alloys. Aboard ship, this alloy has fulfilled every
expectation. In high pressure and high
temperature steam power plants, it offers all the toughness needed for
feedwater heaters regardless of the type of tube used in the main
condensers. In petroleum refineries,
where temperatures and pressures are too high for other copper alloys, C71500
is the alloy specified. In fact,
wherever conditions are unusually severe, or where process liquids, vapors, and
cooling waters are corrosive, such as in submarines or in nuclear power plants,
this copper alloy is the choice of plant designers and of maintenance and
production engineers. The ability of
C71500 to stand up under the most adverse conditions also prescribes its use in
evaporators, inter-after condensers and air ejectors of steam condensers. The large diameters that Ansonia Copper &
Brass manufactures are also extensively used as heat exchanger shells. When supplied in rod form, C71500 finds ready
use as hot forged fittings, elbows, and tees slated for use in or near salt
water and/or under extreme conditions.
Applicable Specifications: When so specified, C71500 will be
manufactured to the latest revision of the following specifications: ASTM Specifications B151 for rod, B124 for
forging rod, B466 for seamless pipe and tube, military specifications MIL‑C‑15726F
and MIL‑T‑16420, and federal specifications.
Standard Forms Available: Rod and tube.
For other forms, please contact Ansonia Copper & Brass, Inc.
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ADS Nos. C71500 & C71520
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Rev. No. 1
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Rev. Date 4/23/99
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(D19) C71500C71520
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P. O. Box 109 - Ansonia,
Connecticut 06401
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725 Bank St. – Waterbury,
Connecticut 06708
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Tel.: 1-800-521-1703 FAX 203-735-3787
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Tel.: 1-800-243-3204 FAX 203-756-1330
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PROPERTIES OF C71500 &
C71520
Nominal
Composition: 69.5%
Copper
30%
Nickel
0.5%
Iron
Physical Properties:
Melting Point (Liquidus): 1240°C
(2260°F)
(Solidus): 1170°C
(2140°F)
Density at 68°F: 0.323
Lbs./In.3
Coefficient of Thermal Expansion per °F: 9.0
x 10-6 (68-572°F)
Electrical Conductivity at 68°F (volumetric): 5%
IACS (in the annealed condition; lower in hard temper)
Thermal Conductivity Btu/ft.2/ft./hr./°F
at 68°F: 17
Modulus of Elasticity - Tension: 22,000 ksi
Modulus of Rigidity: 8,300
ksi
Fabrication
Properties:
Hot
Working Temperature: 925-1050°C
(1700-1900°F)
Annealing
Temperature: 600-825°C
(1200-1500°F)
Approximate Relative Machinability: 20 (Free cutting brass arbitrarily rated at
100)
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Typical Mechanical Properties:
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Size
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Temper
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Tensile Strength
(psi)
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Yield Strength
.5% EUL (psi)
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% Elongation
(in 2")
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Rod Products
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1"
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Soft
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60,000
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30,000
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40
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2"
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Soft
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57,000
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27,000
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41
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3"
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Soft
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56,000
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25,000
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41
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Tube Products
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4.5"OD
x .109" Wall
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Soft
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55,000
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21,000
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41
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10.750"OD
x .187" Wall
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Soft
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53,000
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19,000
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45
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ADS No. C71500 & C71520
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Rev. No. 1
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Rev. Date 4/23/99
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(D19) C71500C71520
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The
statements and data provided on this data sheet are to be considered only as a
general guide. Commercial variations in
material properties are expected, so values listed here are not intended to be
used for specifications. Please consult
the appropriate industry specifications where applicable. Ansonia Copper & Brass, Inc. also cannot
assume responsibility for performance of these products in service because we
do not control or supervise subsequent use of our products.
