Manufacturer, Supplier & Exporter of Copper Nickel Coupling / Half Coupling

Copper Nickel Couplings, also known as Half Couplings, are essential components in piping systems, designed to join two pipes of the same or different diameters. Manufactured from copper-nickel alloys, they offer outstanding corrosion resistance, particularly in seawater, brine, and chemical environments. These couplings are widely used in marine engineering, desalination plants, chemical processing, and power generation industries for their durability and reliability...

Riddhi Siddhi Impex is a leading manufacturer and supplier of Copper Nickel Couplings in India. With decades of experience in the metal fittings industry, the company ensures precision-engineered products that meet international standards. Their manufacturing process includes forging, machining, and testing of couplings to guarantee consistent quality, strength, and corrosion resistance.

Riddhi Siddhi Impex caters to a wide domestic market, supplying Copper Nickel Couplings across major Indian cities such as Mumbai, Delhi, Bengaluru (Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru (Mysore), Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Vilayat, Somnath, Dahej, Narmada, Ankleshwar, Navsari, Valsad, and Rajpipla..

Copper Nickel Couplings are utilized in pipelines, heat exchangers, shipbuilding, offshore oil rigs, desalination plants, and chemical processing units. Their ability to withstand saline water, high temperatures, and pressure variations makes them ideal for marine and industrial environments. These couplings help ensure leak-proof and reliable connections in critical piping systems..

Copper Nickel Couplings are primarily manufactured from Cu-Ni 70/30 or Cu-Ni 90/10 alloys. Cu-Ni 70/30 contains 70% copper and 30% nickel, while Cu-Ni 90/10 has 90% copper and 10% nickel. These alloys provide excellent resistance to corrosion from seawater and acidic environments while maintaining good mechanical strength..

Copper Nickel Coupling / Half Coupling

Specification

Property	Specification
Material	Copper Nickel 70/30, Copper Nickel 90/10
Standards	ASTM B111, ASTM B122, ASME B16.11
Sizes	1/2" to 6" or custom sizes
Type	Socket Weld, Threaded
Application	Marine piping, chemical plants, desalination, heat exchangers
Finish	Polished, Natural, Customized

Chemical Composition

Element	Cu-Ni 70/30 (%)	Cu-Ni 90/10 (%)
Copper (Cu)	70	90
Nickel (Ni)	30	10
Iron (Fe)	1 max	0.5 max
Manganese (Mn)	0.5 max	0.5 max
Other Elements	Trace	Trace

Mechanical Properties

Property	Cu-Ni 70/30	Cu-Ni 90/10
Tensile Strength	380 MPa	300 MPa
Yield Strength	130 MPa	80 MPa
Elongation	40% min	30% min
Hardness	≤ 90 HRB	≤ 85 HRB

Dimension Chart

Nominal Size (inches)	Outer Diameter (mm)	Wall Thickness (mm)
1/2"	21.3	2.77
3/4"	26.7	2.87
1"	33.4	3.38
1 1/2"	48.3	3.68
2"	60.3	3.91
3"	88.9	4.55
4"	114.3	4.85
6"	168.3	5.54

Equivalent Grades

Standard	Grade
ASTM	Cu-Ni 70/30, Cu-Ni 90/10
EN	2.0872, 2.0873
JIS	C70600, C71500
GB	CuNi30Mn1Fe, CuNi10Fe1Mn

Equivalent Standards

Standard	Description
ASTM B111 / B122	Copper-Nickel Pipe Fittings
ASME B16.11	Forged Fittings, Socket Weld and Threaded

Other Types of Copper Nickel Fittings

Type	Description
Elbows	45° / 90° Socket Weld or Threaded Elbows
Tees	Socket Weld or Threaded Tees for branch connections
Crosses	Four-way Socket Weld or Threaded Cross Fittings
Pipes	Copper-Nickel Alloy Pipes for marine and chemical applications

The mechanical properties of Copper Nickel Couplings include high tensile strength, durability, and elongation capacity. Typically, Cu-Ni 70/30 couplings have a tensile strength of approximately 380 MPa, yield strength around 130 MPa, elongation minimum 40%, and hardness below 90 HRB. These properties make them suitable for high-pressure applications and prolonged service life..

Frequently Asked Questions (FAQs)

Q1: What are Copper Nickel Couplings used for?

A1: They are used for joining pipes in marine, chemical, desalination, and heat exchanger applications, providing high corrosion resistance and durability.

Q2: Can you supply custom sizes?

A2: Yes, Riddhi Siddhi Impex offers custom sizes, wall thicknesses, and threaded or socket weld options to suit project requirements.

Q3: Which alloys are available for couplings?

A3: Both Cu-Ni 70/30 and Cu-Ni 90/10 alloys are available, depending on the corrosion and mechanical property requirements.

Q4: Are these couplings suitable for seawater applications?

A4: Yes, Copper Nickel Couplings are ideal for seawater and marine applications due to excellent corrosion resistance.