CuNi19 Alloy Round Bar for Seawater and Power Plant Use

The CuNi19 34 alloy round bar is a high-performance copper-nickel material designed for industrial and marine applications where reliability and corrosion resistance are critical. Containing between 19% and 34% nickel, it delivers outstanding mechanical strength and durability while maintaining excellent resistance to seawater and high-velocity water flow.

DLX manufactures CuNi19 34 bars with precision and strict quality control, ensuring every bar meets international standards. These bars are trusted by engineers and industrial operators for applications ranging from seawater piping systems to high-performance heat exchangers in power plants.

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Industries such as power generation, offshore oil, desalination, and marine engineering face challenging operating conditions, particularly when exposed to seawater. The global trend toward sustainable energy and offshore infrastructure has increased the demand for corrosion-resistant alloys like CuNi19 34.

Copper-nickel alloys have been a material of choice for decades due to their unique combination of corrosion resistance and mechanical performance. CuNi19 34 stands out by offering a balance between cost, strength, and seawater resistance, outperforming lower nickel alloys while remaining more economical than high-nickel grades such as CuNi34.

1. Power Plants – Cooling water systems and heat exchangers that handle seawater or brackish water.

2. Marine Engineering – Seawater piping, condensers, and fittings for ships, offshore platforms, and coastal installations.

3. Desalination Facilities – Pipes and heat exchangers where continuous seawater exposure demands corrosion-resistant materials.

4. Offshore Oil and Gas – Structural components, risers, and piping systems exposed to aggressive marine conditions.

5. Chemical Processing – Systems that require both mechanical durability and corrosion resistance in seawater environments.

The demand for copper-nickel alloys in power generation and marine applications is growing steadily. Desalination and offshore energy projects are expanding globally, and industries are increasingly specifying alloys that combine performance with long service life. Biofouling resistance, corrosion resistance, and erosion resistance are major factors influencing material selection.

Parameter:

Properties Material	Resistivity 200c μΩ.m	Max working temperature (℃)	Tensile strength (Mpa)	Melting point (℃）	Density (g/cm3)	TCR *10-6/℃ (20-600℃）	EMF vs Cu (μV/℃） （0-100℃）
CuNi1	0.03	200	210	1085	8.9	＜100	-8
CuNi2	0.05	200	220	1090	8.9	＜120	-12
CuNi6	0.1	220	250	1095	8.9	＜60	-18
CuNi8	0.12	250	270	1097	8.9	＜57	-22
CuNi10	0.15	250	290	1100	8.9	＜50	-25
CuNi14	0.2	300	310	1115	8.9	＜30	-28
CuNi19	0.25	300	340	1135	8.9	＜25	-32
CuNi23	0.3	300	350	1150	8.9	＜16	-34
CuNi30	0.35	350	400	1170	8.9	＜10	-37
CuNi34	0.4	350	400	1180	8.9	0	-39
CuNi44	0.5	400	420	1200	8.9	＜-6	-43

Size Range
Wire	0.08-7.5mm
Ribbon	(0.05-0.35)*(0.5-6.0)mm
Strip	(0.50-2.5)*(5-180)mm
Rod	8-50mm

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Compared with CuNi14, CuNi19 34 offers enhanced strength and resistance to high-flow seawater. Compared to CuNi34, it is a more cost-effective solution while still providing excellent durability for most industrial and marine applications. CuNi8, while suitable for mild marine environments, cannot match the performance of CuNi19 34 in power plant and offshore applications.

Comparison Table

DLX stands out as a supplier of premium CuNi19 34 round bars with advanced production capabilities. Our strict quality control ensures that each bar has consistent chemical composition, superior surface finish, and precise dimensions.

We provide custom solutions to meet client specifications, including size, length, and finishing requirements. Our technical team collaborates closely with clients to ensure the bars integrate seamlessly into their systems, enhancing operational efficiency and reducing maintenance costs.

DLX’s global logistics network ensures timely delivery, critical for large industrial projects. This reliability allows clients to maintain project schedules and reduces potential delays caused by material shortages.

• Power Plant Cooling Systems – DLX supplied CuNi19 34 bars for heat exchangers, reducing downtime and maintenance due to the alloy’s resistance to seawater erosion and scaling.

• Offshore Platform Piping – Our bars were used in seawater risers and piping systems, providing reliable performance under continuous exposure to corrosive conditions.

As global infrastructure expands into offshore energy and desalination, the demand for copper-nickel alloys like CuNi19 34 will continue to rise. The combination of performance, durability, and cost-effectiveness makes it a material of choice for designers and engineers tackling complex industrial projects.

DLX remains committed to innovation, maintaining the highest standards of quality, and offering tailored solutions. Our focus ensures that clients always receive materials that meet the demands of their most challenging applications.

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About Us:

Our 12,000㎡ factory is equipped with complete capabilities for research, production, testing, and packaging. We strictly adhere to ISO 9001 standards in our production processes, with an annual output of 1,200 tons. This ensures that we meet both quantity and quality demands. Furthermore, all products undergo rigorous simulated environment testing including high temperature, high pressure, and corrosion tests before being dispatched, ensuring they meet customer specifications.

For all our clients, we offer timely and multilingual after-sales support and technical consulting, helping you resolve any issues swiftly and efficiently.

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FAQs:

1. What is the composition of CuNi19 34 alloy round bar?
   It contains copper with 19–34% nickel, along with trace elements for enhanced corrosion resistance and strength.

2. Why is CuNi19 34 bar ideal for seawater applications?
   It offers excellent resistance to seawater corrosion, biofouling, and stress cracking, making it reliable for marine environments.

3. Can CuNi19 34 bars be welded and fabricated?
   Yes, they have excellent weldability and can be processed using standard industrial methods.

4. How does CuNi19 34 perform under high-velocity water flow?
   The alloy resists erosion and cavitation, ensuring long-term reliability in high-speed cooling or seawater systems.

5. What industries commonly use CuNi19 34 round bars?
   Marine engineering, power generation, desalination plants, offshore oil and gas, and chemical processing.

6. What standards govern CuNi19 34 alloy bars?
   They are manufactured under ASTM, EN, and DIN standards for copper-nickel alloys.

7. How does CuNi19 34 compare with other copper-nickel alloys?
   It provides a balance of mechanical strength and corrosion resistance, superior to lower nickel grades and more cost-effective than higher nickel options.

8. Does CuNi19 34 reduce maintenance costs?
   Yes, its durability minimizes repairs and replacements in harsh industrial environments.