C75400 Nickel Silver

C75400 Nickel Silver

Cu 63.5-66.5%
NOMINAL COMPOSITION
ASTM B122 / B151
SPECIFICATION
8.7 g/cm3
DENSITY
C75400 Nickel Silver (CuNi15Zn20) is a wrought copper-nickel-zinc alloy with a silver-white finish, good corrosion resistance, and moderate strength for decorative, musical, optical, and precision parts. Supplied to ASTM B122 / B151.
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Product Overview

C75400 Nickel Silver (also designated CuNi15Zn20 or JIS C7541) is a wrought copper-nickel-zinc alloy containing roughly 65% copper, 15% nickel, and balance zinc. The nickel content gives the material its characteristic silver-white color and solid corrosion resistance, while cold working controls strength and hardness across tempers from annealed to extra-hard.

Supplied as sheet, strip, rod, bar, and wire to ASTM B122 and B151, C75400 offers moderate tensile strength (about 425 MPa in 1/8-hard, up to 590 MPa in hard tempers) with good formability in softer conditions. It machines at roughly 20% of free-cutting brass, solders and brazes well, and is suited to blanking, drawing, spinning, and etching. Electrical conductivity stays low at about 7% IACS, so it is specified for appearance and corrosion resistance rather than conduction.

When you need C75400 in non-standard sizes or project-specific tempers, Linsy Copper supports low-MOQ custom production with typical lead times of 10-60 days depending on grade, dimensions, and processing. Our Shenzhen factory provides in-house CNC machining, laser cutting, and surface finishing such as bright polishing or silver plating, and issues an MTR/MTC for every order with optional SGS testing available on request.

Key Features

Silver-white nickel silver finish with good tarnish and corrosion resistance
Wrought Cu-Ni-Zn alloy supplied to ASTM B122 (sheet/strip) and B151 (rod/bar)
Strength and hardness tunable from annealed to extra-hard via cold work
Excellent cold formability for blanking, drawing, spinning, and etching
Good soldering and brazing response; machinability ~20% of free-cutting brass
Low electrical conductivity (~7% IACS) - specified for appearance and corrosion service, not conduction

Available Sizes

Copper Shape Thickness (mm) Width/Diameter (mm) Length (m)
Bar - Φ5-200 1-6
Wire - Φ0.05-10 Customize
Sheet 0.25-6 500-2500 1-6
Plate 6-200 200-3000 1-6
Strip 0.15-6 8-610 Customize
Tube OD: φ2-600; WT:φ0.2-100mm - 1-6
Coil 0.15-6 3-1250 1-6
Foil < 0.15 10-1350 Customize
Profile Customized Customize Customize

* Custom sizes available upon request. Contact our sales team for special requirements.

Technical Specifications

Precision data for engineering decisions. All values tested per ASTM standards.

01 Chemical Composition

Element Min % Max %
Cu (incl. Ag) 63.5 66.5
Ni (incl. Co) 14.0 16.0
Pb 0.10
Fe 0.25
Mn 0.50
Zn Remainder

02 Mechanical Properties (Flat Products)

Temper Tensile Strength (MPa) Yield Strength (MPa) Elongation %
1/8 Hard (H00) ≈427 ≈241 30
1/4 Hard (H01) ≈448 ≈338 21
1/2 Hard (H02) ≈510 ≈427 10
Hard (H04) ≈586 ≈517 3

Applications & Use Cases

Proven solutions across diverse industries. From aerospace to marine environments.

Frequently Asked Questions

Common questions about C75400 nickel silver composition, tempers, standards, and applications.

Both are Cu-Ni-Zn nickel silvers, but C75400 (CuNi15Zn20) carries slightly more zinc than C75200 (CuNi18Zn27) and a bit less nickel, giving a similar silver appearance with marginally different strength and formability. C75200 is the more common grade; C75400 is often chosen for specific strip and decorative specifications.
Sheet, strip, and plate are covered by ASTM B122; rod, bar, and wire by ASTM B151. International equivalents include JIS C7541 and EN CuNi15Zn20 (BZn15-20).
No. Electrical conductivity is only about 7% IACS. It is specified for its silver-white appearance, corrosion resistance, and mechanical behavior, not for conductive paths. Use pure copper or conductive copper grades where current carrying is required.
Tempers run from annealed/soft through 1/8-hard, 1/4-hard, 1/2-hard, hard, to extra-hard. Tensile strength rises from about 425 MPa (1/8-hard) to roughly 590 MPa (hard), while elongation drops from 30% to around 3%. Softer tempers suit deep forming; harder tempers suit springs and high-stress parts.
It resists atmospheric and mild marine corrosion better than brass, but it is not a dedicated seawater-grade copper-nickel like C70600 or C71500. For prolonged immersion or high-velocity seawater, those 90-10 or 70-30 Cu-Ni alloys are the safer choice. C75400 fits trim, hardware, and above-water marine parts.
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