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C87500 Cold Rolled Copper Rod

C87500 cold rolled copper rod exhibits a bright, gold-like yellow color with improved surface finish and mechanical properties due to the cold working process.
Distinctive Golden-Yellow Color
High Strength from Cold Working
Good Corrosion Resistance
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Introduction
C87500 Cold Rolled Copper Rod

The C87500 cold rolled copper rod exhibits a bright, gold-like yellow color that is distinctly lighter than ordinary brass and significantly different from the reddish hue of pure copper. This silicon brass alloy (approximately 81% copper, 4% silicon, and 15% zinc) owes its attractive appearance to the balanced composition, while the cold rolling process imparts a smooth, refined surface finish with improved dimensional accuracy.

Cold rolling enhances the rod’s mechanical properties by refining its grain structure, resulting in increased tensile strength, higher hardness, and better surface quality compared to cast or hot-rolled alternatives. These characteristics, combined with excellent corrosion resistance (particularly against dezincification) thanks to the silicon addition, make the C87500 cold rolled copper rod an ideal choice for manufacturing valve stems, plumbing components, and other precision-engineered parts where both strength and golden aesthetics are required.

parameter
parameter table for C87500 Cold Rolled Copper Rod
Parameter Value / Description
Alloy Type Silicon Brass (Copper-Silicon-Zinc alloy)
UNS Number C87500
Nominal Composition Cu: 79–83%
Si: 3.5–4.5%
Zn: 12–16%
Pb: ≤ 0.09%
Fe: ≤ 0.15%
Density 8.44 g/cm³ (0.305 lb/in³)
Melting Range 870 – 910°C (1600 – 1670°F)
Thermal Conductivity 60 W/m·K (at 20°C)
Electrical Conductivity ~12% IACS
Tensile Strength (Cold Rolled) 450 – 550 MPa (65 – 80 ksi)
Yield Strength (0.2% offset) 380 – 480 MPa (55 – 70 ksi)
Elongation 8 – 15% (depending on temper)
Hardness 120 – 160 HRB (Rockwell B)
Modulus of Elasticity 103 GPa (15 × 10³ ksi)
Surface Finish Smooth, bright, gold-like yellow
Corrosion Resistance Excellent (especially dezincification resistant)
Typical Applications Valve stems, plumbing fittings, pump components, decorative hardware
Forms Available Round rods, hex bars, square bars (cold rolled condition)
Advantages
Advantages of C87500 Cold Rolled Copper Rod
Our case presentation
Applications for C87500 Cold Rolled Copper Rod
Valve Components and Stems
C87500 is widely used in the production of valve stems, valve seats, and other internal valve parts for industrial and residential plumbing systems. The alloy's excellent corrosion resistance protects against dezincification when exposed to potable water, steam, or aggressive fluids. Its high tensile strength, derived from the cold rolling process, ensures that valve stems can withstand repeated rotational and axial stresses without bending or stripping threads. Additionally, the material's natural golden appearance provides an attractive finish for exposed valve handles and trim, eliminating the need for separate plating operations. Typical applications include ball valves, gate valves, globe valves, and faucet cartridges used in water distribution networks, HVAC systems, and industrial process control.
Plumbing Fittings and Pipe Connectors
The cold rolled C87500 rod is an excellent raw material for manufacturing plumbing fittings such as adapters, couplings, elbows, tees, and compression fittings. The alloy combines good machinability with high strength, allowing precision thread cutting and internal boring operations to be performed efficiently. Its resistance to dezincification is particularly valuable in hot water systems and recirculating loops where ordinary brass would gradually weaken and leak. Furthermore, the smooth, bright surface achieved by cold rolling reduces the need for additional finishing steps before assembly. These fittings are commonly found in residential and commercial potable water systems, hydronic heating loops, fire sprinkler systems, and industrial fluid handling lines where long-term reliability is essential.
Pump Components and Impeller Shafts
Pump manufacturers frequently select C87500 cold rolled rods for producing pump shafts, wear rings, bushings, and balance discs. The alloy's combination of corrosion resistance and mechanical strength allows it to operate in challenging environments including seawater, wastewater, and chemical transfer applications. The cold rolled condition provides a smooth, uniform surface that reduces friction against seals and bearings, extending the service life of both the pump and its maintenance intervals. Unlike some stainless steel alloys, C87500 does not suffer from pitting corrosion in chloride-containing environments when properly maintained. Typical pump applications include centrifugal pumps, diaphragm pumps, gear pumps, and submersible pumps used in municipal water supply, agricultural irrigation, marine ballast systems, and light chemical processing.
Decorative Architectural Hardware
Beyond functional applications, C87500 cold rolled copper rods are extensively used for decorative and architectural hardware where both appearance and performance are required. The alloy's inherent gold-like yellow color provides an upscale, warm metallic finish that complements building interiors and exteriors. Unlike plated or painted components that can fade, chip, or wear through over time, C87500 retains its color throughout the entire cross-section. Common decorative applications include door handles, cabinet pulls, drawer knobs, hinge components, railings, light fixture parts, and ornamental trim. Because the cold rolling process produces a smooth surface with consistent dimensions, these components can often be used directly after machining without polishing or coating. This reduces production costs while delivering a premium aesthetic that ages gracefully, developing a subtle patina over many years rather than showing conspicuous wear.
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Gnee steel group is a professional one-stop supply chain company for steel products in China. The copper technology has reached the world average technology level and has been approved by dozens of project companies to be the star company in Asia.
Established in 2008 with a registered capital of 5 million RMB, Gnai has made remarkable progress and development in the steel market. At present, the company has a total investment of 30 million yuan, a plant area of more than 35,000 square meters and more than 200 employees. With a clear strategic framework, a complete governance structure, a solid management foundation, and strong financial and human resources, the company is becoming the most professional internationalized steel supply chain company in the Central Plains.
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What Are Your Company’s Main Products?
Our main products are copper plate/sheet, coil, round/square pipe, bar, etc.
How Do You Control Quality?
Mill Test Certification is supplied with shipment, Third Party Inspection is available. and we also get ISO,SGS,Alibaba Verified.
What Are The Advantages Of Your Company?
We have many professionals, technical personnel, more competitive prices and best after-dales service than other copper companies.
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