What is H62 brass?
H62 brass, as a typical copper-zinc alloy, possesses significant advantages in its physical properties for industrial applications. This material exhibits a typical α+β dual-phase microstructure at room temperature, with a density of approximately 8.5 g/cm³, which lies between that of pure copper (8.96 g/cm³) and zinc (7.14 g/cm³). This special crystal structure endows it with good mechanical properties and machinability, making it an important foundational material in fields such as power transmission, electronics, and construction.
In terms of thermal properties, H62 brass demonstrates excellent thermal and electrical conductivity. Its thermal conductivity can reach 110 W/(m·K), approximately three times that of low-carbon steel. This characteristic makes it particularly suitable for manufacturing electrical components that require rapid heat dissipation. Experimental data shows that when the zinc content is controlled within the 38-42% range, the alloy's electrical conductivity remains above 28% IACS (International Annealed Copper Standard). Notably, its coefficient of linear expansion is 20.6 × 10⁻⁶/°C (20-300°C), which is close to that of ordinary glass. This compatibility makes it an ideal choice for vacuum device sealing components.
Regarding mechanical properties, H62 brass has a tensile strength ranging from 330 to 450 MPa, an elongation of about 35%, and an HRB hardness of 55-75. Through cold working and hardening treatments, its strength can be increased to over 600 MPa, though this comes at the cost of reduced plasticity. Research data indicates that when the deformation reaches 30%, the material's yield strength increases by approximately 40%. This tunable mechanical characteristic provides flexibility for different application scenarios. In terms of fatigue performance, its conditional fatigue limit is about 180 MPa (10⁷ cycles), which surpasses that of most aluminum alloys.
From an electrical characteristics perspective, H62 brass has a volume resistivity of about 6.5 × 10⁻⁸ Ω·m. While this is not as low as pure copper, it is sufficient to meet most conductive needs. In practical applications, its contact resistance stability is particularly outstanding. After 1000 hours of testing in a humid environment, the change rate of its contact resistance does not exceed 15%. This stable electrical contact performance gives it an irreplaceable advantage in applications involving frequent switching, such as relays and switches.
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Machinability is a prominent feature of H62 brass. Its hot working temperature range is 700-850°C, and it allows for cold working deformation of over 80%. During machining, its chip-breaking performance is excellent, with a tool wear rate only one-third that of 45# steel. In precision casting, it exhibits good fluidity, capable of completely replicating fine patterns above 0.2 mm. This excellent formability allows it to be processed into complex cross-sectional profiles. Common products include ultra-thin strips as thin as 0.05 mm and fine wires with diameters as small as 0.3 mm.
In terms of corrosion resistance, H62 brass has an annual corrosion rate of less than 0.002 mm in atmospheric environments and a corrosion current density of about 3 μA/cm² in seawater. The addition of 0.02-0.1% arsenic significantly improves its resistance to dezincification corrosion.
Experiments have shown that arsenic-containing H62 brass reduces the dezincification layer depth by over 80% compared to ordinary H62 brass in an 80°C, 3% NaCl solution. However, protective measures are still necessary in the presence of specific media like ammonia and sulfur dioxide.
Notably, the performance changes of H62 brass at different temperatures follow a regular pattern. When the temperature rises to 300°C, its strength decreases by about 30%, while its elongation increases by 50%. This temperature sensitivity needs to be considered for high-temperature applications. In low-temperature environments (-196°C), its impact toughness can still maintain over 85% of its room temperature value, demonstrating good low-temperature stability.
In practical engineering applications, the physical property parameters of H62 brass need to be adjusted according to specific working conditions. For example, when manufacturing spring components, a combination of cold rolling and aging at 300°C is often employed to increase the elastic modulus to 110 GPa. For welding applications, formulations with lower zinc content are chosen to improve weldability. This designable characteristic of its properties allows H62 brass to continue playing a key role in high-end fields such as aerospace precision components, automotive oil circuit systems, and marine engineering equipment.
Our factory
Our factory serves as the core base for the precision manufacturing of copper products, integrating advanced equipment, strict quality control, and efficient production capacity. We possess a complete production line covering the entire process from raw material smelting and continuous rolling to precision drawing/cutting, with key equipment including large-tonnage hydraulic stretching machines, high-precision CNC machine tools, and automated surface treatment systems. This enables the large-scale and customized production of a wide range of products such as copper rods, tubes, plates, strips, and wires. The factory strictly adheres to the ISO quality management system and is equipped with testing instruments such as spectrometers and mechanical property testing machines to monitor process parameters and product performance throughout the entire process. Digital production management is achieved through an ERP system and visual dashboards, ensuring timely order delivery. Furthermore, we implement a green manufacturing philosophy, equipped with exhaust gas treatment and scrap recycling systems, committed to providing customers with high-quality and sustainable copper material solutions.
Copper product packaging
We employ professional and reliable packaging solutions to comprehensively protect the integrity of all types of copper products during long-distance transportation and handling. For copper rods and tubes, we use moisture- and rust-proof materials for wrapping, secured with sturdy wooden crates or steel strapping to prevent bending and deformation. Copper plates and strips are sealed with waterproof paper or plastic film, protected with edge guards, and then fixed on customized wooden pallets or metal racks to avoid surface scratches and moisture. Copper wires are neatly wound on specialized reels, wrapped with moisture- and rust-proof film, and reinforced at the edges. All packaging is designed according to export standards, with clear labeling to ensure the safe delivery of goods to our global customers.
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