What is C21000 brass?
C21000 Brass is a high-copper-content copper-zinc alloy, also known as H95 Brass or Commercial Pure Brass. Below is a detailed introduction:
Chemical Composition: Copper content ranges from 94.0% to 96.0%, with zinc as the remainder. Lead ≤ 0.05%, iron ≤ 0.05%, and total other impurities ≤ 0.15%.
Corresponding Grade Designations:
China: H96
Japan: C2100
Germany: CuZn5
Physical Properties: Density is 8.86 g/cm³, melting point ranges from 1055°C to 1070°C, electrical conductivity is 56% IACS, and thermal conductivity is 260 W/(m·K), which is close to that of pure copper.
Mechanical Properties: In the soft (annealed) state, tensile strength ranges from 205 MPa to 250 MPa, elongation from 35% to 50%, and hardness is relatively low, with a Vickers hardness (HV) of 50–60. This makes it highly suitable for cold working and forming.
Processing Performance: It exhibits excellent cold workability, allowing for operations such as stamping and drawing. The optimal hot-working temperature range is 775°C to 850°C, and the annealing temperature range is 400°C to 600°C.
Corrosion Resistance: It performs exceptionally well in dry atmospheres, fresh water, and non-oxidizing acids. However, environments containing sulfur or ammonia should be avoided.
Application Fields: It is widely used in the electrical industry for manufacturing conductive components such as wires, relays, and terminals. In architectural decoration, it is suitable for roofing, sculptures, and medals. It is also employed in marine engineering for submarine cables and heat exchanger pipes, as well as in precision components like coins, musical instrument reeds, and electromagnetic shielding materials.
FAQ
| Q: What are the mechanical properties of C21000? A: Typical mechanical properties of C21000 (annealed condition) include a tensile strength of about 38–45 ksi (260–310 MPa), yield strength around 10–15 ksi (70–105 MPa), and elongation of 45–55%. Hardness is approximately 45–55 HRB. |
| Q: What is the equivalent of C21000 in European standards? A: C21000 is roughly equivalent to CuZn5 in EN standards (EN 1652) and may correspond to C2100 in JIS (Japanese standards). However, exact equivalents depend on specific composition and application requirements. |
| Q: What is C21000 brass used for? A: C21000 is commonly used in architectural decoration, jewelry crafting, medals, nameplates, electrical connectors, and decorative hardware due to its aesthetic appeal, formability, and good conductivity. |
| Q: Can C21000 be welded or brazed? A: Yes, C21000 can be welded and brazed using appropriate techniques. Oxyacetylene welding, TIG, and resistance welding are suitable, while brazing with silver-based or phosphorus-copper fillers is common. |
| Q: Is C21000 corrosion resistant? A: C21000 offers good corrosion resistance in atmospheric, freshwater, and mild chemical environments. However, it is not recommended for prolonged exposure to seawater or highly acidic/alkaline conditions. |
| Q: What is the difference between C21000 and C26000? A: The primary difference is copper content: C21000 (~95% Cu) is softer and more ductile with a reddish-gold color, while C26000 (~70% Cu) is stronger and more widely used in cartridges and mechanical parts. |
| Q: Where can I buy C21000 brass sheet or strip? A: C21000 products are supplied by specialized metal distributors, mills, and online metal suppliers. Ensure the supplier provides certified Mill Test Reports (MTR) for quality assurance. |
| Q: Does C21000 contain lead? A: Standard C21000 is typically lead-free. However, always verify with the supplier's material certification to ensure compliance with regulations like RoHS or NSF for specific applications. |
| Q: What tempers or forms is C21000 available in? A: C21000 is commonly supplied in annealed (soft), half-hard, and hard tempers. Available forms include sheet, strip, foil, wire, tube, and occasionally rod. |
| Q: Can C21000 be polished or plated? A: Yes, C21000 takes well to mechanical polishing, buffing, and electroplating (e.g., nickel, gold, or chrome) for enhanced appearance and durability. |
| Q: Is C21000 suitable for marine applications? A: C21000 is not ideal for direct seawater exposure due to potential dezincification. For marine environments, alloys like C46400 (naval brass) or copper-nickel alloys are preferred. |
| Q: What are the thermal conductivity and electrical conductivity of C21000? A: C21000 has about 80–85% IACS electrical conductivity and thermal conductivity around 100–120 W/(m·K), making it suitable for certain electrical and heat exchange applications. |
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Our factory is a modern, specialized manufacturer of copper and copper alloy products with over 19 years of experience. We integrate R&D, production, and sales into one seamless operation. Equipped with advanced production lines-including continuous casting and rolling, precision drawing, cold rolling, and automated finishing equipment-we strictly adhere to the ISO 9001 quality management system and international standards such as ASTM and EN. We focus on producing high-quality copper tubes, sheets, plates, rods, wires, and strips.
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We are committed to providing safe and efficient end-to-end logistics support for every order you place. Upon completion of production, all products are professionally and custom-packaged according to their shape and transportation requirements: copper tubes are lined with moisture-proof padding and secured in reinforced wooden cases or heavy-duty steel strapping; sheets and strips are sealed with waterproof stretch film and fixed on reinforced wooden pallets, with corner protectors added to the edges; wires and rods are bundled and coated with anti-rust protection. All packaging meets export standards and can withstand long-distance sea freight and complex land transportation. We offer a variety of trade terms, including EXW, FOB, and CIF, and collaborate with multiple international logistics companies to arrange door-to-door delivery and provide real-time shipment tracking, ensuring your goods arrive at your designated destination on time and in perfect condition.
