Copper Nickel Elbows are pipe fittings designed to change the direction of flow within a piping system while maintaining excellent corrosion resistance and mechanical strength.
Our Copper Nickel Elbows are available in long radius and short radius configurations to accommodate various piping layouts and project requirements.
Copper Nickel Elbows are essential pipe fittings used to change the direction of flow in copper-nickel piping systems. With excellent resistance to seawater corrosion, biofouling and erosion, copper nickel butt weld elbows are widely used in marine engineering, shipbuilding, offshore platforms, desalination plants, heat exchangers and seawater cooling systems.
Our Copper Nickel Elbows are available in 90° and 45° designs, including 1.5D long radius elbows and 1.0D short radius elbows. They are designed for stable flow performance, reliable welding quality and long service life in demanding seawater environments.
Key Product Range
Product: Copper Nickel Elbows
Connection: Butt Weld
Angles: 90°, 45°
Radius: 1.5D Long Radius, 1.0D Short Radius
Standards: DIN86090, EEMUA234, ASME B16.9
90° LR Elbow45° LR Elbow45° SR ElbowCu-Ni Butt Weld Elbow
Available according to drawing or project specification
Copper Nickel Butt Weld Elbow Types and Radius Options
Copper nickel butt weld elbows are available in different angles and bend radii to suit seawater, shipbuilding, offshore and industrial piping systems. Selection is usually based on pipeline layout, flow requirements, available space and project specifications.
Copper Nickel 90° / 45° Long Radius Elbow 1.5D
A 1.5D copper nickel elbow is commonly referred to as a long radius elbow. It allows a smoother change in flow direction, helping to reduce turbulence and pressure loss in the piping system.
Long radius butt weld elbows are often specified for main seawater lines, cooling water systems, ballast systems, firewater lines and other CuNi piping applications where stable flow performance is important.
Common options include 90° long radius copper nickel elbows and 45° long radius copper nickel elbows.
Copper Nickel 90° / 45° Short Radius Elbow 1.0D
A 1.0D copper nickel elbow is known as a short radius elbow. Its compact bend design is suitable for piping layouts where space is limited or where equipment connections require a tighter change in direction.
Short radius butt weld elbows are widely used in ship piping, machinery spaces, offshore modules and other confined installation areas.
Available types include 90° short radius copper nickel elbows, 45° short radius elbows and other compact butt weld elbow configurations according to project requirements.
Available Copper Nickel Grades
Copper nickel alloys are widely used in seawater piping, heat exchangers, condensers, shipbuilding, and offshore systems because of their strong corrosion resistance, reliable mechanical performance, and natural resistance to marine biofouling. The two most commonly specified grades are CuNi 90/10 and CuNi 70/30.
CuNi 90/10 — C70600 Copper Nickel Alloy
CuNi 90/10, also known as C70600, contains approximately 90% copper and 10% nickel. It is one of the most widely used copper nickel grades for marine service due to its excellent resistance to seawater corrosion and good overall durability.
Nominal composition: 90% copper and 10% nickel
Excellent resistance to seawater corrosion and erosion
Commonly used for seawater cooling systems, ship piping, condensers, and heat exchangers
Good weldability and dependable long-term service in marine environments
CuNi 70/30 — C71500 Copper Nickel Alloy
CuNi 70/30, or C71500, contains approximately 70% copper and 30% nickel. Compared with CuNi 90/10, this grade offers higher strength and improved resistance in demanding seawater conditions, especially where flow velocity or operating pressure is higher.
Nominal composition: 70% copper and 30% nickel
Higher strength than CuNi 90/10
Excellent performance in high-velocity seawater systems
Preferred for naval vessels, offshore platforms, desalination plants, and heavy-duty marine equipment
Strong resistance to corrosion, impingement attack, and stress-related service conditions
Copper Nickel Elbow Chemical Composition
90/10 (UNS C70600) CuNi Elbow Chemical Composition
KME CuNi90/10
DIN 17664 2.0882
BS 2871 CN102
ASTM B466 C70600
JIS H3300 C7060T
DIN 86019 2.1972
EEMUA 234 UNS 7060X
GB/T 5231 BFe10-1.6-1
Ni%
10.0-11.0
9.0-11.0
10.0-11.0
9.0-11.0
9.0-11.0
9.0-11.0
10.0-11.0
9.0-11.0
Fe%
1.5-1.8
1.0-2.0
1.0-2.0
1.0-1.8
1.0-1.8
1.5-1.8
1.5-2.0
1.5-1.8
Mn%
0.6-1.0
0.5-1.0
0.5-1.0
max.1.0
0.2-1.0
0.5-1.0
0.5-1.0
0.5-1.0
C%
max.0.05
max.0.05
max.0.05
max.0.05
max.0.05
max.0.05
max.0.05
Pb%
max.0.01
max.0.03
max.0.01
max.0.02
max.0.05
max.0.01
max.0.01
max.0.03
S%
max.0.005
max.0.02
max.0.05
max.0.02
max.0.005
max.0.02
max.0.01
P%
max.0.02
max.0.02
max.0.02
max.0.02
max.0.02
max.0.02
Zn%
max.0.05
max.0.50
max.0.50
max.0.50
max.0.05
max.0.20
max.0.20
Other
max.0.20
max.0.30
max.0.20
max.0.30
max.0.40
Cu%
rem.
rem.
rem.
rem.
+Ni+Fe+Mn min99.5
rem.
rem.
rem.
70/30 (UNS C71500) CuNi Elbow Chemical Composition
KME CuNi70/30
DIN 176642.0882
BS 2871 CN107
ASTM B466C71500
JIS H3300C7150T
Ni%
30.0-32.0
30.0-32.0
30.0-32.0
29.0-33.0
29.0-33.0
Fe%
0.47-0.7
0.4-1.0
0.4-1.0
0.4-1.0
0.4-1.0
Mn%
0.5-1.0
0.5-1.5
0.5-1.5
max.1.0
0.2-1.0
C%
max.0.04
max.0.05
max.0.06
max.0.05
Pb%
max.0.01
max.0.03
max.0.01
max.0.02
max.0.05
S%
max.0.01
max.0.02
max.0.08
max.0.02
P%
max.0.02
max.0.02
max.0.02
Zn%
max.0.20
max.0.50
max.0.50
max.0.50
Other
max.0.30
max.0.30
Cu%
rem.
rem.
rem.
rem.
+Ni+Fe+Mn min99.5
Popular Copper Nickel Elbows for Marine & Seawater Piping
Copper nickel elbows are essential fittings for marine piping systems, seawater cooling lines, offshore platforms, shipbuilding projects and desalination plants. They are valued for excellent corrosion resistance in seawater, reliable flow performance and long service life in demanding environments.
Smooth flow direction change with lower pressure loss
45° Short Radius Copper Nickel Elbow
45° SR CuNi Elbow
Compact piping layouts where installation space is limited
Long radius copper nickel elbows are commonly selected when stable flow and reduced pressure drop are required. Short radius elbows are preferred for tight installation areas where space-saving pipe routing is important. We supply CuNi 90/10 and CuNi 70/30 elbows in various sizes, wall thicknesses and standards to meet different marine, offshore and industrial project requirements.
HC Copper Nickel Elbows Manufactured to Recognized Standards
Our copper nickel elbows are produced for marine, offshore, shipbuilding and seawater piping applications, with dimensions and inspection requirements available according to internationally accepted standards.
DIN 86090
A commonly used standard for copper nickel pipe fittings in shipbuilding and marine piping systems, especially for seawater cooling, bilge, ballast and fire-fighting lines.
EEMUA 234
Frequently specified for copper nickel alloy piping components used in seawater service, offshore platforms, desalination plants and other corrosion-resistant piping systems.
ASME B16.9
Covers factory-made wrought butt welding fittings and is often required for projects using standardized dimensions, welding ends and pressure piping specifications.
We supply copper nickel elbows in CuNi 90/10 and CuNi 70/30 materials, including 45 degree elbows, 90 degree elbows and custom bending or butt weld fittings. Depending on project requirements, we can support specified wall thicknesses, end bevel preparation, dimensional tolerances, surface finishing, PMI testing, inspection reports and material certificates.
For shipyards, engineering contractors and industrial piping projects, copper nickel elbows can also be manufactured according to customer drawings, technical specifications or approved project standards. Please share your required size, alloy grade, standard, quantity and inspection requirements for a suitable quotation.
Material Features of Copper Nickel Elbows
Copper nickel elbows are widely used in seawater piping systems because they offer dependable corrosion resistance, good mechanical strength and stable performance in harsh marine environments. Common grades include 90/10 Cu-Ni and 70/30 Cu-Ni, selected according to seawater conditions, pressure requirements and project specifications.
Excellent Seawater Corrosion Resistance
Copper nickel alloys form a protective surface film in seawater, helping elbows perform reliably in shipbuilding, offshore platforms, desalination plants and coastal industrial piping systems.
Strong Resistance to Erosion and Flow Wear
Cu-Ni elbows provide good resistance to erosion, turbulence and impingement attack, making them suitable for seawater cooling lines, ballast systems and other high-flow marine applications.
Natural Biofouling Control
The copper content in copper nickel helps reduce marine growth inside piping systems, supporting cleaner flow passages and lowering maintenance needs in long-term seawater service.
Reliable Weldability for Butt Weld Systems
Copper nickel elbows are well suited for welded piping networks. With proper welding procedures, they provide strong joints and consistent performance across marine and industrial installations.
Long Service Life in Marine Conditions
Designed for demanding environments, copper nickel pipe elbows offer long-term durability in offshore structures, naval vessels, commercial ships, seawater intake systems and fire-fighting pipelines.
Stable Performance Across Critical Applications
Whether used in cooling water systems, desalination equipment or seawater distribution lines, Cu-Ni elbows help maintain stable operation where corrosion resistance and reliability are essential.
Applications of Copper Nickel Elbows
Shipbuilding piping systems
Offshore oil and gas platforms
Seawater cooling systems
Desalination plants
Marine fire-fighting pipelines
Ballast and bilge systems
Heat exchanger piping
Coastal industrial piping systems
Power plant seawater intake and discharge lines
In marine and offshore projects, the reliability of elbows directly affects the safety and service life of the entire piping system. That is why proper material selection, accurate dimensions and qualified welding ends are critical.
Copper Nickel Elbow Stock Dimensions & Weights
Copper Nickel Elbows are manufactured according to DIN 86090, EEMUA 234 and ASME B16.9 standards for marine, offshore and industrial piping systems. Available in 45° and 90° configurations, these elbows provide reliable flow direction changes while maintaining excellent corrosion resistance in seawater environments.
Available in CuNi 90/10 and CuNi 70/30 materials
45° and 90° butt weld elbow configurations
1.0D, 1.5D and Long Radius (LR) designs
Suitable for seawater, offshore and shipbuilding systems
Dimensional and weight references for engineering design
Custom dimensions, wall thicknesses and project-specific requirements can be supplied upon request.
DIN 86090 Copper Nickel Butt Weld Elbows — 1.5D
DIN 86090 1.5D copper nickel elbows are widely used in shipbuilding, offshore platforms and seawater piping systems. The long radius design provides smoother flow transition and reduced pressure loss.
specification
OD
S
a
≈e
Weight
Weight
45°
90°
inch
DN
mm
mm
mm
mm
kg
kg
1/2
15
20
1
25
10.4
0.013
0.026
3/4
20
25
1.5
27.5
11.4
0.029
0.058
1
25
30
1.5
33.5
14
0.030
0.06
11/4
32
38
1.5
45
19
0.06
0.12
11/2
40
44.5
1.5
51
21
0.07
0.14
2
50
57
1.5
72
30
0.13
0.26
21/2
65
76
2
95
39
0.31
0.62
3
80
89
2
114.5
47
0.44
0.88
4
100
108
2.5
142.5
59
0.88
1.66
5
125
133
2.5
181
75
1.30
2.60
6
150
159
2.5
216
89
1.85
3.70
7
175
194
3
270
112
2.85
5.70
8
200
219
3
305
126
4.35
8.70
10
250
267
3
378
157
6.55
13.10
12
300
324
4
457
189
12.80
25.60
14
350
368
4
533.5
221
17.00
34.00
16
400
419
4
609.5
252
24.85
49.70
18
450
457
4.5
686
284
30.95
61.90
20
500
508
5
762
316
41.95
83.90
24
600
610
5
914
379
62.00
113.0
Typical Applications
Marine seawater cooling systems, ballast water systems, offshore fire-fighting pipelines, desalination plants and naval engineering projects.
DIN 86090 Copper Nickel Butt Weld Elbows — 1.0D
DIN 86090 1.0D elbows provide a compact solution where installation space is limited. The shorter radius design helps reduce piping layout requirements while maintaining excellent corrosion resistance.
specification
OD
S
a
≈e
Weight
Weight
45°
90°
inch
DN
mm
mm
mm
mm
kg
kg
1
25
30
1.5
30
12
0.027
0.054
11/4
32
38
1.5
32.5
14
0.033
0.076
11/2
40
44.5
1.5
40
17
0.057
0.144
2
50
57
1.5
52.5
22
0.10
0.20
21/2
65
76
2
70
29
0.23
0.46
3
80
89
2
82.5
34
0.32
0.65
4
100
108
2.5
100
41
0.58
1.16
5
125
133
2.5
125
52
0.90
1.80
6
150
159
2.5
150
62
1.30
2.60
7
175
194
3
180
75
1.90
3.80
8
200
219
3
210
87
3.00
6.00
10
250
267
3
255
106
4.44
8.88
12
300
324
4
305
126
8.55
17.10
14
350
368
4
352.5
146
11.30
22.60
16
400
419
4
400
166
16.40
32.80
18
450
457
4.5
455
189
20.45
40.90
20
500
508
5
505
210
28.10
56.20
24
600
610
5
610
253
45.00
90.00
Advantages of 1.0D Elbows
Ideal for machinery rooms, confined offshore structures, compact piping arrangements and retrofit projects.
EEMUA 234 Copper Nickel Elbows — Long Radius (LR)
EEMUA 234 copper nickel elbows are commonly specified for offshore and marine seawater systems. The standard includes dimensions suitable for 16 bar and 20 bar service conditions.
specification
OD
S 16bar
S 20bar
a
≈e
Weight 16bar
Weight 20bar
Weight 16bar
Weight 20bar
90°
90°
45°
45°
inch
mm
mm
mm
mm
mm
kg
kg
kg
kg
1
30
2.5
2.5
38
22
0.12
0.12
0.06
0.06
11/4
38
2.5
2.5
48
25
0.13
0.13
0.09
0.09
11/2
44.5
2.5
2.5
57
29
0.30
0.30
0.15
0.15
2
57
2.5
2.5
76
35
0.52
0.52
0.25
0.25
21/2
76.1
2.5
2.5
95
44
0.90
0.90
0.45
0.45
3
88.9
2.5
2.5
114
51
1.25
1.25
0.65
0.65
4
108
3
3
152
64
2.10
2.10
1
1
6
159
3
3.5
229
95
4.70
5.50
2.30
2.70
8
219.1
4
4.5
305
127
12
13
6.00
6.50
10
267
4.5
5.5
381
159
20
24
10
12
12
323.9
5.5
7
457
190
35
45
17
23
14
368
6.5
8
533
222
55
67
27
34
16
419
7
9
610
254
77
99
38
50
18
457.2
8
9.5
686
286
109
128
54
64
20
508
8.5
11
762
318
142
184
71
92
24
610
10.5
13
914
381
252
312
126
156
28
711
12
15
1067
438
394
490
197
245
32
813
13.5
17
1219
502
579
725
289
362
36
914
15.5
19
1372
565
841
1026
420
513
Why EEMUA 234 Is Used Offshore
EEMUA 234 fittings are widely recognized in offshore oil and gas projects due to their proven reliability, dimensional consistency and compatibility with CuNi seawater piping systems.
ASME B16.9 Copper Nickel Butt Weld Elbows — 1.5D
ASME B16.9 copper nickel elbows are commonly used for international projects requiring compliance with ASME piping dimensional standards.
DN
OD
s 10s
a
≈e
Weight
Weight
45°
90°
inch
mm
mm
mm
mm
mm
kg
kg
1/2
15
21.3
2.11
38
16
0.035
0.07
3/4
20
26.7
2.11
38
19
0.04
0.08
1
25
33.4
2.77
38
22
0.065
0.13
11/4
32
42.2
2.77
48
25
0.075
0.15
11/2
40
48.3
2.77
57
29
0.17
0.33
2
50
60.3
2.77
76
35
0.29
0.58
21/2
65
73
3.05
95
44
0.55
1.1
3
80
88.9
3.05
114
51
0.77
1.53
4
100
114.3
3.05
152
64
1.07
2.13
6
150
168.3
3.4
229
95
2.75
5.50
8
200
219.1
3.76
305
127
5.64
11.28
10
250
273
4.19
381
159
9.3
18.6
12
300
323.8
4.57
457
190
14.54
29.08
14
350
355.6
4.78
533
222
20.2
40.45
16
400
406.4
4.78
610
254
26.29
52.58
18
450
457
4.78
686
286
32.57
65.13
20
500
508
5.54
762
318
46.28
92.55
24
600
610
6.35
914
381
76.20
152.4
Important Note
ASME B16.9 specifies dimensional requirements. Material grades are generally supplied according to ASTM B366, ASTM B466, UNS C70600, UNS C71500 or customer project specifications.
Copper Nickel Elbows Quality Control
Quality control is built into every step of our copper nickel elbows production, from incoming material inspection to forming, heat treatment, testing, marking, and final packing. Each elbow is checked against the purchase order, applicable standards, and project specifications to help ensure reliable fit-up, stable corrosion resistance, and long service life in seawater, marine, offshore, and industrial piping systems.
Inspection items can be arranged according to customer requirements, drawing details, and standards such as ASME, ASTM, EN, or project-specific specifications. Typical quality checks include:
Dimensional inspection for outside diameter, wall thickness, bend radius, end preparation, and tolerance control
Visual inspection to check surface finish, forming quality, cleanliness, cracks, dents, and other visible defects
Chemical composition analysis to confirm compliance with copper nickel grades such as Cu-Ni 90/10 or Cu-Ni 70/30
Mechanical testing, including tensile strength, elongation, and hardness checks when required
PMI testing for fast material verification and traceability before shipment
Hydrostatic testing or pressure-related inspection when specified by the order or application
Non-destructive testing, such as ultrasonic testing, radiographic testing, or penetrant testing based on project needs
MTC review to verify heat number, material grade, test results, and full documentation traceability
Before delivery, the copper nickel elbows are cleaned, protected, clearly marked, and packed with suitable materials to reduce the risk of scratches, deformation, moisture exposure, or handling damage during transportation and storage.
Why Choose Our Copper Nickel Elbows
We supply butt weld CuNi elbows in common and project-specific designs, including 90° long radius elbows, 45° long radius elbows, short radius elbows, 1.5D elbows and 1.0D elbows. Sizes, wall thickness, end preparation and inspection documents can be arranged according to your drawing or project specification.
Recognized Standards
Copper nickel elbows can be supplied in accordance with DIN 86090, EEMUA 234 and ASME B16.9 requirements for marine, offshore and industrial piping systems.
90° and 45° Elbow Designs
Choose from 90° and 45° copper nickel butt weld elbows to suit different pipeline layouts, flow directions and installation spaces.
Long Radius and Short Radius
Available in 1.5D long radius and 1.0D short radius options, helping engineers balance flow performance, space limitations and piping design needs.
Made for Butt Weld Piping
Designed for copper nickel butt weld pipe systems, with suitable end preparation to support accurate alignment and reliable welding.
Consistent Forming Quality
Each elbow is formed with attention to smooth internal surfaces, stable dimensions and clean geometry to reduce installation problems on site.
Documentation for Projects
Beveled ends, material certificates, inspection reports, marking details and custom drawings are available when required by your project.
FAQ – Copper Nickel Elbows
What are Copper Nickel Elbows used for?
Copper Nickel Elbows are used to change pipeline direction in seawater and marine piping systems. They are common in shipbuilding, offshore platforms, desalination plants, and seawater cooling systems.
What is the difference between 1.5D and 1.0D elbows?
1.5D elbows are long radius elbows, offering smoother flow and lower pressure loss. 1.0D elbows are short radius elbows, mainly used where installation space is limited.
Which standards are available?
We can supply Copper Nickel Elbows according to DIN 86090, EEMUA 234, and ASME B16.9 standards.
What are the popular Copper Nickel Elbow types?
Popular types include 90° Long Radius Elbow / 90° LR Elbow, 45° Long Radius Elbow / 45° LR Elbow, and 45° Short Radius Elbow / 45° SR Elbow.
Can you supply customized Copper Nickel Elbows?
Yes. Copper Nickel Elbows can be produced according to customer drawings, required standards, wall thickness, size range, and project specifications.
Which copper nickel grade is better for seawater service?
Both CuNi 90/10 and CuNi 70/30 perform well in seawater environments. CuNi 70/30 offers superior strength and erosion resistance at higher flow velocities.
What are the disadvantages of using copper-nickel?
Copper-nickel is usually more expensive than carbon steel and some stainless steels. It also requires proper welding procedures and material control. In polluted seawater, high sulfide conditions, or systems with improper flow velocity, corrosion performance may be affected.
Is cupronickel stronger than copper?
Yes. Cupronickel is generally stronger than pure copper. CuNi 70/30 has higher strength and better erosion resistance than CuNi 90/10, making it suitable for more demanding seawater service conditions.
The following Copper Nickel Elbows may interest you
