What is C21000 brass?
C21000 brass is a high-purity brass alloy primarily composed of copper (94%–96%) and zinc (balance), with trace amounts of iron, lead, nickel, and other elements. It exhibits excellent corrosion resistance, electrical and thermal conductivity, high strength, wear resistance, and good workability, making it widely applicable in electrical, thermal, automotive, and construction industries. Below is a detailed introduction to C21000 brass:
Chemical Composition
The chemical composition of C21000 brass mainly includes:
Copper (Cu): 94%–96%, the primary component, providing excellent electrical conductivity, thermal conductivity, and corrosion resistance.
Zinc (Zn): Balance, forming a solid solution with copper to adjust the alloy's color and workability.
Iron (Fe): ≤0.05%, refines grain structure and improves mechanical properties.
Lead (Pb): ≤0.05% (some sources specify ≤0.03%), enhances lubrication, wear resistance, and machinability.
Nickel (Ni): ≤0.5%, improves strength, toughness, and resistance to dezincification and stress corrosion cracking.
Other Impurities: Total ≤0.3% (some sources specify ≤0.15%), ensuring stable alloy performance.
Physical Properties
The physical properties of C21000 brass include:
Density: Approximately 8.86 g/cm³.
Electrical Conductivity: ≥50% IACS (International Annealed Copper Standard), offering good electrical performance.
Thermal Conductivity: 210–234 W/(m·K), demonstrating excellent heat transfer capability.
Melting Temperature Range: 1050–1070°C, with favorable melting process characteristics.
Specific Heat Capacity: c = 387 J/(kg·°C), contributing to thermal stability under temperature variations.
Mechanical Properties
The mechanical properties of C21000 brass are as follows:
Tensile Strength: 220–280 MPa in the annealed condition, providing relatively high strength.
Elongation: ≥35% in the annealed condition, indicating good ductility.
Hardness: ≤60 HB in the annealed condition, offering moderate hardness for easy processing.
Workability
C21000 brass exhibits excellent workability and can be processed into various shapes and specifications through cold rolling, hot rolling, stamping, drawing, and other methods. Its cold workability is outstanding, enabling deep drawing and bending, while its hot workability is relatively poor, with a tendency to crack at high temperatures. After work hardening, annealing treatment (550–650°C) is required to restore ductility.
Corrosion Resistance
C21000 brass demonstrates good corrosion resistance in atmospheric, freshwater, and seawater environments, as well as resistance to non-oxidizing acids and many organic media. Its extremely low lead content (≤0.05%) complies with potable water contact standards (e.g., NSF/ANSI 61), making it safe and non-toxic. However, corrosion rates accelerate in oxidizing acids, and it is unsuitable for high-chloride environments such as seawater due to the risk of dezincification corrosion.
Application Fields
Thanks to its excellent properties, C21000 brass is widely used in multiple industries:
Electrical Industry: Manufacturing electrical connectors such as terminals, switch contacts, and heat sinks.
Thermal Engineering: Producing heat exchangers, radiators, and other thermal management components.
Automotive Industry: Manufacturing automotive parts such as fasteners and decorative elements.
Construction Sector: Fabricating water pipes, valves, fittings (complying with NSF 61 standards), roofing sheets, rain gutters, and decorative trims.
Other Fields: Also used for chemical equipment linings, industrial components, and daily necessities (e.g., medals, musical instrument reeds, jewelry accessories).
Product Range of GNEE
| Product Category | Product Forms | Comprehensive Materials & Standards (UNS / Common Names) |
|---|---|---|
| Copper & Copper Alloy Tubes | Round, Square, Rectangular, Capillary, Coiled, Bundles, Straight Lengths | Pure Copper: C10200 (OFE), C11000 (ETP) Brass: C21000 (Gilding 95%), C23000 (Red Brass 85%), C26000 (Cartridge Brass 70/30), C28000 (Muntz Metal 60/40), C44300, C68700 (Arsenical Aluminum Brass) Bronze: C22000 (Commercial Bronze 90%), C38500 (Architectural Bronze) Copper-Nickel: C70600 (90/10), C71500 (70/30) Others: C12000 (DLP), C12200 (DHP) |
| Copper & Copper Alloy Sheets/Plates | Sheets, Plates, Rolls, Circles/Blanks, Embossed, Perforated | Pure Copper: C11000, C10200 Brass: C26000, C26800, C27200 (Yellow Brass 65/35),C21000 Phosphor Bronze: C51000 (A), C52100, C52400 Nickel Silver (German Silver): C75200 (65-18), C77000 (55-18) Beryllium Copper: C17200, C17500 High Copper Alloys: C19400 |
| Copper & Copper Alloy Rods/Bars | Round, Hex, Square, Flat, Rectangular, Forging Billets, Hollow Bars | Free-Cutting Brass: C36000 (CDA 360) Leaded Brass: C38500, C35600 Naval Brass: C46400, C48200, C48500 Bronze: C22000, C51000, C54400 (Free-Cutting Phosphor Bronze) Copper-Nickel: C71000, C71500 Pure Copper: C11000, C10100 |
| Copper & Copper Alloy Wires | Round, Flat, Square, Stranded, Bare, Tin-Plated, Annealed, Hard Drawn | Pure Copper Wire: C11000 (ETP), C10200 (OF) for magnet wire Brass Wire: C26000, C27200, C21000 Beryllium Copper Wire: C17200, C17500 Phosphor Bronze Wire: C51000, C52100 Resistance Welding Wire: C11000, C18200 (Chromium Copper) Spring Wire: Various tempers of C51000, C52100, C17200 |
| Copper & Copper Alloy Strips/Foils | Thin Strip, Foil (down to 0.05mm), Precision Slit Coils, Shim Stock, Finned Strip | Brass Strip: C26000, C26800, C22000,C21000 Phosphor Bronze Strip: C51000, C51900, C52100, C52400 Pure Copper Strip: C11000, C10200, C12000 Nickel Silver Strip: C75200, C77000 Electronic Alloys: C19400 (Lead Frame), C70250, C70350 Special Alloys: C72500 (Cu-Ni-Sn) |
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Copper product packaging
We are committed to providing comprehensive and reliable packaging solutions for your shipments. For standard products, we employ industrial-grade packaging: copper tubes are lined with moisture-proof paper and packed in sturdy wooden cases or secured with iron strapping; sheets, strips, and foils are sealed with waterproof plastic film, placed on wooden pallets, and reinforced with steel straps; rods and wires are bundled with anti-rust protection. All packaging is designed to withstand long-distance sea freight and multimodal transportation. We also offer customized services such as logo printing, vacuum packaging, or special inner lining protection upon request, ensuring the products arrive in perfect condition.
