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CuNi HSC
COPPER-NICKEL PIPE, FITTINGS & FLANGES
FOR SHIPBUILDING & OFFSHORE INDUSTRY

HARESH STEEL CENTRE

CuNi HSC
COPPER-NICKEL PIPE, FITTINGS & FLANGES
FOR SHIPBUILDING & OFFSHORE INDUSTRY
HARESH STEEL CENTRE
rd
Add.: 22/28, 3 Panjrapole Lane, C.P. Tank Road, Mumbai - 400 004, Maharashtra, India
Tel.: 0091-9823458877 | Email: jatin@flangesandpipefittings.com | www.hareshsteel.com / www.flangesandpipefittings.com

HARESH STEEL CENTRE
The Company
Established in the year 1973, we, 'Haresh Steel Centre, Mumbai', have gained
specialization in manufacturing, exporting, supplying, importing and trading a
wide range of Pipes, Fittings, Flanges, Sheets & Plates, Fasteners, and Other
Industrial Steel Products. The entire product range offered by us is obtained
from leading and certified market vendors, who manufacture these products
as per national & international standards such as BS, ASTM, DIN, IS, ANSI,
ASME and MSS. Due to these attributes, our steel products are widely
regarded in chemical, petrochemical, refineries, paper, breweries, cement,
construction, engineering and many other industries. Furthermore, we hold
expertise in providing these steel products in varied specifications to suit the
specific demands of customers.
.
Our enterprise has been successful in developing healthy business connections
with the vendors so as to fulfill the exceeding requirements of customers.
Furthermore, we have constructed a bulk storage unit, which allows us in
accommodating the products in abundance. This unit aids us in storing the
products in an organized and systematic manner. Owing to the endeavors
made by our experts and logistics unit, we are able to provide the products
on-time at the customers' doorstep. We have mustered a long list of clients
such as Tecnimont ICB Limited, Larsen & Toubro Limited and Bharat Heavy
Electrical Ltd. in both domestic as well as in international clients. Some of the
countries where our products are exported are Indian Subcontinent, East Asia,
Middle East, African Continent and Europe.
.
Under the visionary guidance of our mentor, 'Mr. Jatin', we have made a
trustworthy stature in this industry. His rich domain expertise and managerial
skills have aided us in obtaining a tremendous growth in short period of time.
Vision
To be the Trusted SUPPLIERS OF STEEL in every corner of the world.
Mission
TOTAL CUSTOMER SATISFACTION

CuNi HSC
COPPER-NICKEL PIPE, FITTINGS & FLANGES
FOR SHIPBUILDING & OFFSHORE INDUSTRY
HARESH STEEL CENTRE
rd
Add.: 22/28, 3 Panjrapole Lane, C.P. Tank Road, Mumbai - 400 004, Maharashtra, India
Tel.: 0091-9823458877 | Email: jatin@flangesandpipefittings.com | www.hareshsteel.com / www.flangesandpipefittings.com

GENERAL INFORMATION
THE PIPE, FITTINGS & FLANGES OF COPPER - NICKEL ALLOYS.

Copper-Nickel Pipe

Copper-Nickel Butt-Weld Pipe Fitting

Copper-Nickel Flange

Copper-Nickel Socket-Weld Fitting

The Introduction of CuNi 90/10 and CuNi 70/30 Alloy :
The Attractive corrosion and biofouling Resistance of copper-nickel alloys in seawater
and related environments have Led to their
substantial use in marine service for many years.
The two main, wrought copper-nickel Alloys
chosen for seawater service contain 10% or 30%
Nickel, respectively. Development work began in
the 1930s in response to A requirement by the
British Navy for in improved condenser material.
Since the 1950s, the 90-10 Alloy has become
accepted for naval service. In naval vessels, the

90-10 copper-nickel is preferred for surface
ships; Whereas, the 70-30 alloy is used for
submarines because its greater strength makes it
more acceptable for the higher pressures
encountered. These alloys are also used for
power station condensers and offshore seawater
pipe work on oil/gas platforms: Large quantities
are selected for the desalination industry and
they are additionally used for cladding and
sheathing of marine structures and hulls.

GENERAL INFORMATION
THE PIPE

STANDARD
The Available Standard Specifications of Cu-Ni 90/10 Pipes & Cu-Ni 70/30 Pipes

COUNTRY GERMANY
KIND
SEAMLESS

SEAM WELDED

DIN 86019
DIN 1755
DIN 85004
DIN 86018

UNITED
KINGDOM
BS 2871 PT 2
EEMUA 144
NES 779 PT 3
BS 2875

USA

FRANCE

JAPAN

ASTM B466
MIL-T-16420K TYPE I
GRADE 1
ASTM B467
ASTM B608
MIL-T-16420K TYPE I
GRADE 1 OR GRADE 2

GAM MM11
S.T.F.22.54/C.005

H3300

GAM MM11
S.T.F.22.54/C.005

H3320

GENERAL INFORMATION
THE MATERIAL
Characteristics of Copper Nickel Alloy ;
Good Resistance to stress corrosion & cavitaion erosion.
Excellent resistance to sea water
Good thermal stability (up to approx. 300 )
Good cold - workability
Good Welding and solder properties.

Chemical Composition and Comparision Table
for Cu-Ni Alloys
Comparison Table of Standard Specifications for Cu-Ni 90/10 Pipe

Cu%
Ni%
Fe%
Mn%
C%
Pb%
S%
P%
Zn%
Other imp.

DIN 17664
2.0872

DIN 86019
2.1972

BS 2871
CN 102

rem.
9.0 - 11.0
1.0 - 2.0
0.5 - 1.0
max. 0.05
max. 0.03
max. 0.02
max. 0.02
max. 0.50
max. 0.30

rem.
9.0 - 11.0
1.5 - 1.8
0.5 - 1.0
max. 0.05
max. 0.01
max. 0.005
max. 0.02
max. 0.05
max. 0.20

rem.
10.0 - 11.0
1.0 - 2.0
0.5 - 1.0
max. 0.05
max. 0.01
max. 0.05
max. 0.30

EEMUA
144-1987
UNS C 7060x
rem.
10.0 - 11.0
1.5 - 2.0
0.5 - 1.0
max. 0.05
max. 0.01
max. 0.02
max. 0.02
max. 0.20
max. 0.30

MIL-T-16420K
ASTM B 466
C 70600
rem.
9.0 - 11.0
1.0 - 1.8
max. 1.00
max. 0.05
max. 0.02
max. 0.02
max. 0.02
max. 0.50
-

JIS H 3300
C 7060T
Cu+Ni+Fe
rem.
9.0 - 11.0
1.0 - 1.8
0.2 - 1.0
max. 0.05
max. 0.50
Cu+Ni+Fe+Mn : min 99.5%

Comparison Table of Standard Specifications for Cu-Ni 70/30 Pipe

Cu%
Ni%
Fe%
Mn%
C%
Pb%
S%
P%
Zn%
Other imp.

DIN 17664
2.0882

BS 2871
CN 107

rem.
30.0 - 32.0
0.4 - 1.0
0.5 - 1.5
max. 0.05
max. 0.03
max. 0.02
max. 0.02
max. 0.50
max. 0.30

rem.
30.0 - 32.0
0.4 - 1.0
0.5 - 1.5
max. 0.06
max. 0.01
max. 0.08
-

MIL-T-16420K
ASTM B 466
C 71500
rem.
29.0 - 33.0
0.4 - 1.0
max. 1.00
max. 0.05
max. 0.02
max. 0.02
max. 0.02
max. 0.50
-

JIS H 3300
C 7150T
rem.
29.0 - 33.0
0.4 - 1.0
0.2 - 1.0
max. 0.05
max. 0.50
Cu+Ni+Fe+Mn : min 99.5%

GENERAL INFORMATION
THE FABRICATION TECHNIQUES FOR COPPER NICKEL ALLOY

Heating
In the presence of contaminants such as sulphur,
phosphorus, lead and other low-melting-point meals,
copper alloys may become embrittled when heated.
It is therefore important that the work piece is clean
and free from contaminants before heating. Sources
of deleterious substances are marking and
temperature-indicating
paints
and
crayons,
lubricating grease and fluids, fuels etc. Fuels must be
low in Sulphur; e. g. natural gas and liquid petroleum
gas should contain less than 0.1% and town s gas
0.25% maximum of sulphur. Fuel oil should contain a
Maximum of 0.5% sulphur. (all percentages are by
weight.) For Cunifer 10 and Cunifer 30 the furnace
atmosphere should be neutral or very slightly
reducing. Electric heating is recommended.
Hot working
Hot working may be carried out in the following
ranges :
Cunifer 10
950 - 840 (1750 - 1550 )
Cunifer 30
1000 - 840 (1830 - 1550 )
See also the later section on got bending. The
material may be charged into the furnace at
maximum working temperature and allowed to soak
until the work piece is uniformly heated,
approximately 6 minutes 0 /100mm(4in) of section.
The material should then be withdrawn immediately
and worked within the specified range. Prolonged
soaking should not be allowed. If during working,
temperature of the metal falls below the specified
minimum it must be reheated. Air cooling is
satisfactory.
Cold Bending
Pipes are normally supplied in the annealed
condition. If possible, the tube should be bent using
bending machines when the radius of curvature is
equal to or greater than three times the diameter.

tubes up to 80mm(3in) diameter may be cold bent
with radius of curvature equal to twice the diameter.
For bend radii less than this it is advisable to use
fittings. Where cold bending is done without the use
of a tube bending machine the tube must be filled.
The most usual filler are dry silica sand free from all
carbonaceous matter and sodium thiosulfate (hypo).
The tube must be tightly packed. After bending it is
important that the filler is completely removed and
the tube thoroughly cleaned.
Annealing
Metallurgical annealing is not necessary after hot
working. For Cunifer 10 and Cunifer 30 a full anneal is
achieved by heating to 750 - 840 (1380 - 1550 ) but a
considerable degree of softening can be obtained b
heating at 600 - 650 (1100 - 1200 ) Stress relief can be
achieved by heating within the range 350 - 450 (660 840 ).
Pickling
After hot and/or cold bending, cleaning and stress
relieving, all traces of scale should be removed by
pickling or acid cleaning. A suitable pickling solution is
5 to 10% of sulphuric acid plus 25 -50 g/l(4 8 oz/gal.)
of sodium dichromate. After picking, the tube should
be thoroughly rinsed in hot, fresh water.
Joining
Metallurgically, Cunifer 10 and Cunifer 30 are solidsolution alloys with no deleterious second phases and
experience no phase transformation during heating
and cooling. They are usually welded or brazed in the
annealed condition. It is also essential that the
surfaces adjacent to the joint must be clean and free
from oxide. To remove oxide and other
contaminants, an area approximately 25mm wide on
each side of the joint should be prepared by scratchbrushing with a clean, stainless steel brush used only
for copper alloy. This is followed by degreasing with a
non-toxic non-flammable solvent. No pre-heat is
required, but the material must be free from
moisture. In cold or humid conditions, it should be
warmed to about 25ºC. Interpass temperature should
be controlled and should not exceed 10ºC. Modern
welding techniques such as TIG and MIG may be used
in addition to brazing for the joining.

GENERAL INFORMATION
THE PIPE, FITTINGS & FLANGES OF COPPER - NICKEL ALLOYS.
Welding Consumables
It is usual practice to weld Cunifer 10 with 70/30
copper-nickel bare filler metal. Flux-coated
electrodes can be used for wall thicknesses of above
6mm. Welding consumables of almost matching
composition to Cunifer 10 are, however, available.
Under certain circumstances the use of a nominally
70/30 nickel-copper electrode or filler metal,
particularly for dissimilar metal joints, is suggested.
Cunifer 30 can be welded with 70/30 copper-nickel
filler metal.
Table 1 gives details of material specification.

Welding Consumable Specifications
Country

90/10 copper-nickel-iron
70/ 30 copper-nickel-iron
Flux-coated Filler Wire Flux-coated Filler Wire
Electrode
Electrode
Germany
DIN 1733
DIN 1733
DIN 1733
DIN 1733
S-CuNi10Fe S-CuNi10Fe S-CuNi10Fe S-CuNi10Fe
Mat No.
Mat No.
Mat No.
Mat No.
2.0873
2.0873
2.0873
2.0873
British
BS 2903:Part3
BS 2903:Part3
Type C16
Type C16
90/10
90/10
Cu-Ni-Fe-Ti
Cu-Ni-Fe-Ti
United States
AWS A5.6
AWS A5.7
of America
Class ECuNi Class RCuNi

Table 1 :
Related specifications for flux-coated electrodes and
bare filler wires for welding of Cunifer10 & Cunifer30.
Welding
Whichever process is used, tack welds should be
kept to a minimum and as short as possible. Tack
welds should be deposited in the opposite direction
to the subsequent weld run and each tack must be
thoroughly cleaned before welding commences.
Manual metal arc welding is applicable to Cunifer 10
and Cunifer 30 with thicknesses greater than 6mm.
The majority of flux-coated electrodes are
recommended for operation with direction current,
electrode positive.
Suggested joint preparations are shown in figure1.

Figure 1 :
Suggested joint preparations for the welding of
Cunifer 10 and Cunifer 30.
Manual metal arc welding is preferably carried out in
the down-hand position. Positional welding can be
performed successfully by skilled operators.
Positional welding is facilitated by making the root
run by the TIG process. Direction of travel is then
reversed and welding continued with a weave motion
TIG is preferred for metal thicknesses up to and
including 6mm(0.2in). TIG welding may also be used
for the root runs in thicker material, the fill-up runs
being deposited by the manual metal arc process.
For Cunifer 10 and Cunifer 30, direct current is
required. For all these materials shielding gas is
99.95% pure argon which is also used as the back
purging gas for Cunifer 10 and Cunifer 30.
Satisfactory filler wires are given in table 1 and
suggested edge preparations are shown in figure1.
Table 2 gives typical operating data for TIG welding.
Metal
Diameter
Diameter
Welding
thickness of tungsten
of filler
current
electrode
wire
mm
In
mm
mm
mm
1.5 0.06
1.6
1.5 or 2.0
60 - 80
2
0.08
1.6
2.0
80 - 100
4
0.16 2.4 or 3.2
2.0 to 4.0
170 - 190
6
0.24
3.2
3.2 to 5.0
240 - 280
8
0.32
3.2
3.2 to 5.0
240 - 280
10 0.40
3.2
3.2 to 5.0
240 - 280
Table 2 :
Typical operating data for the TIG welding of Cunifer
10 and Cunifer 30.


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