C75200 – Nickel Silver (65% Cu, 18% Ni, 17% Zn)
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C75200 – Nickel Silver (65% Cu, 18% Ni, 17% Zn) Brochure
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Descriptions
C75200 Nickel Silver, also known as CuNi18Zn18, is a copper–nickel–zinc alloy valued for its distinctive silver-white appearance, moderate strength, and superior corrosion and tarnish resistance. Despite the name “nickel silver,” this alloy contains no actual silver; instead, its appealing color and luster come from the controlled addition of nickel.
C75200 combines mechanical durability, excellent formability, and long-term stability in both decorative and functional uses. It is widely applied in jewelry, musical instruments, optical components, and precision hardware that require a bright, silver-like finish with the toughness of copper alloys.
This alloy also demonstrates good cold-working and fabrication properties, making it suitable for stamping, drawing, spinning, and bending operations, while maintaining excellent surface quality and resistance to atmospheric oxidation.
Chemical Composition
The typical chemical composition of C75200 Nickel Silver (CuNi18Zn18) is shown below. This precise alloy balance provides the alloy’s distinctive silver-white appearance, along with corrosion resistance, strength, and workability suited to both decorative and engineering applications.
| Element | Percentage (%) | Remarks |
|---|---|---|
| Copper (Cu) | 63.0 – 66.5 | Provides ductility, formability, and thermal conductivity |
| Nickel (Ni) | 16.5 – 19.5 | Imparts silver-like color, corrosion resistance, and strength |
| Zinc (Zn) | Balance (~14.5) | Improves hardness, strength, and casting quality |
| Manganese (Mn) | ≤ 0.50 | Enhances toughness and deoxidation |
| Iron (Fe) | ≤ 0.25 | Trace element; minor effect on mechanical behavior |
| Lead (Pb) | ≤ 0.05 | Improves machinability in certain product forms |
Note: Copper plus all named alloying elements total ≥ 99.5%. Composition may vary slightly with specific product forms or international specifications.
Mechanical, Physical & Fabrication Properties
C75200 Nickel Silver offers an excellent combination of strength, ductility, and corrosion resistance. These properties make it ideal for components that demand both structural integrity and aesthetic appeal, such as decorative hardware, musical instruments, and precision-engineered fittings.
| Mechanical Properties | ||
|---|---|---|
| Property | Typical Range / Value | Remarks |
| Tensile Strength | 386 – 710 MPa | Good strength with excellent formability |
| Yield Strength | 172 – 621 MPa | Varies with temper and fabrication method |
| Elongation at Break | Up to 45% | High ductility for drawing and shaping operations |
| Modulus of Elasticity | 117 GPa | Provides stiffness and dimensional stability |
| Machinability Rating | ~20 (vs. Free-Cutting Brass = 100) | Good machinability for precision components |
| Physical Properties | ||
|---|---|---|
| Property | Typical Value | Remarks |
| Density | 8.73 g/cm³ | High density for durability and rigidity |
| Electrical Conductivity | 3.5 MS/m (~18% IACS) | Moderate conductivity suitable for contact applications |
| Thermal Conductivity | 33 W/m·K | Ensures stability under varying temperatures |
| Coefficient of Thermal Expansion | 16.2 µm/m·°C | Good dimensional stability across temperature variations |
| Modulus of Elasticity | 124 GPa | Indicates strong elastic behavior under load |
| Poisson’s Ratio | 0.34 | Typical for ductile copper alloys |
The combination of mechanical resilience, excellent surface finish, and resistance to tarnish ensures C75200 Nickel Silver performs reliably in both decorative and structural applications.
Applications
C75200 Nickel Silver (CuNi18Zn18) is prized for its distinctive silver-like finish, combined with excellent corrosion resistance, strength, and formability. It is used across a wide range of industries that demand both aesthetic appeal and functional performance.
- Jewelry & Fashion Accessories: Used for necklaces, bracelets, belt buckles, pendants, and other decorative items due to its lustrous finish and tarnish resistance.
- Musical Instruments: Ideal for valves, keys, and precision components requiring excellent corrosion resistance and acoustic stability.
- Optical Components: Utilized in camera, microscope, and telescope parts for its dimensional stability and fine surface finish.
- Decorative Hardware: Commonly used in zippers, buttons, trim pieces, nameplates, and architectural fittings where appearance and durability are equally important.
- Electrical Applications: Applied in electrical contacts, connectors, and terminals because of its moderate conductivity and ease of fabrication.
The combination of aesthetic appeal, corrosion resistance, and mechanical versatility makes C75200 Nickel Silver a popular material in jewelry, instrumentation, and engineering design.
Standards & International Equivalents:
C75200 Nickel Silver (CuNi18Zn18) conforms to multiple international standards that ensure chemical consistency, mechanical reliability, and product quality. These specifications cover a range of product forms including sheet, strip, rod, wire, and tube for decorative, electrical, and industrial applications.
| Standard Organization | Designation | Description / Remarks |
|---|---|---|
| UNS | C75200 | Unified Numbering System designation for Nickel Silver (CuNi18Zn18) |
| ASTM | B122 / B122M, B151 / B151M, B206 / B206M, B458 | Standards covering plate, sheet, strip, rod, and wire forms of copper–nickel–zinc alloys |
| SAE | J461, J463 | Wrought copper alloy material specifications for engineering applications |
| EN / DIN | CW409J | European designation for CuNi18Zn18 – Nickel Silver |
| BS | NS106 | British Standard for Nickel Silver alloys |
These global equivalents ensure interchangeability and standardization across industries, allowing C75200 Nickel Silver to be reliably sourced and specified for international projects.
Common Names & International Identifiers
C75200 Nickel Silver (CuNi18Zn18) is recognized globally under several standard and trade names. These designations are commonly used by manufacturers, suppliers, and engineers to ensure precise material identification across international markets.
| Category | Designation / Name | Remarks |
|---|---|---|
| Common Names | Nickel Silver, CuNi18Zn18 | Refers to the copper–nickel–zinc alloy with a silver-like appearance |
| Trade Designations | UNS C75200, CW409J (EN), NS106 (BS) | Widely accepted commercial references for international sourcing |
| CDA Alloy Number | 752 | Assigned by the Copper Development Association (CDA) |
These standard identifiers help ensure traceability, quality assurance, and compliance when specifying C75200 Nickel Silver in engineering and decorative applications.
Common Product Forms & Dimensions
C75200 Nickel Silver (CuNi18Zn18) is supplied in a wide range of standard and custom forms to meet diverse manufacturing and engineering requirements. Precision processing ensures excellent surface finish, dimensional accuracy, and mechanical consistency across all products.
| Form | Dimensions | Notes |
|---|---|---|
| Rods | Diameter: 5 – 200 mm Length: 1000 – 6000 mm |
Custom cutting and finishing available |
| Plates | Thickness: 0.5 – 50 mm Width: 200 – 2000 mm |
Available with polished, brushed, or coated surfaces |
| Strips / Coils | Thickness: 0.1 – 3.0 mm Width: 10 – 600 mm |
Ideal for continuous stamping and forming applications |
| Tubes | Outer Diameter (OD): 10 – 150 mm Wall Thickness: 0.5 – 10 mm |
Used in heat exchangers, condensers, and fluid systems |
| Profiles | Custom extruded shapes (hexagon, square, rectangle, etc.) | Designed for structural, architectural, or decorative use |
All C75200 Nickel Silver products can be supplied in customized dimensions, tempers, and finishes as per client specifications. Mill Test Certificates (MTC) are provided in accordance with ASTM B122 / B151 standards.
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