H68 Brass Possesses Extremely Good Plasticity

H68 brass is a common and widely used brass alloy.

In terms of chemical composition, the copper content is typically 67.0%–70.0%, with zinc as the balance. Lead content is ≤0.03%, phosphorus ≤0.01%, iron ≤0.10%, antimony ≤0.005%, and bismuth ≤0.005%. The total impurity content is ≤0.3%.

In terms of mechanical properties, tensile strength σb (MPa) ≥ 370, elongation δ10 (%) ≥ 15, and elongation δ5 (%) ≥ 18.

H68 brass possesses extremely good plasticity, making it one of the best among brasses, and it also has relatively high strength. Its machinability is excellent, it is easy to weld, and it is very stable against general corrosion. However, it is prone to corrosion cracking in ammonia atmospheres.

Regarding physical properties, its density is approximately 8.47 g/cm³, melting point is between 930°C and 940°C, electrical conductivity is about 27% IACS, thermal conductivity is about 120 W/(m·K), modulus of elasticity is about 105 GPa, tensile strength is about 370 MPa, and hardness is about HB 80-90.

H68 brass has a wide range of applications. It is commonly used for complex cold-stamped and deep-drawn parts, such as radiator housings, conduits, bellows, cartridge cases, gaskets, and detonators. In the electronics and electrical industries, due to its good electrical conductivity, it is an ideal material for manufacturing electronic components such as electrical connectors, terminals, and switches. In the field of mechanical manufacturing, it is used for making mechanical parts like gears, bearings, nuts, and bolts due to its high strength and excellent machinability. In architectural decoration, it is often used for door handles, handrails, and decorative panels because of its aesthetically pleasing golden-yellow color and corrosion resistance.

Regarding heat treatment, the hot working temperature is 750–830°C, the annealing temperature is 520–650°C, and the low-temperature stress relief annealing temperature is 260–270°C.

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H68 brass is mainly composed of copper and zinc, with a copper content between 67.0–70.0% and zinc as the balance. Additionally, it contains small amounts of lead (≤0.03), phosphorus (≤0.01), iron (≤0.10), antimony (≤0.005), bismuth (≤0.005), and other elements, with the total impurity content not exceeding 0.3%. Although present in extremely small amounts, these trace elements have a significant impact on the performance and corrosion resistance of H68 brass. For example, trace amounts of arsenic can prevent dezincification of brass and improve corrosion resistance. Strictly controlling the content of these elements ensures the purity and stability of H68 brass, enabling it to perform excellently in various applications.

H68 brass has outstanding mechanical properties. Its tensile strength σb (MPa) is not less than 370, elongation δ10 (%) is not less than 15, and elongation δ5 (%) is not less than 18. This means H68 brass has a strong ability to resist damage when subjected to tensile forces while also maintaining a certain degree of plasticity during deformation. These good mechanical properties allow H68 brass to be used in manufacturing various components that need to withstand significant stress, such as mechanical parts like gears, bearings, nuts, and bolts. For instance, in automobile manufacturing, components made from H68 brass can operate stably in complex working environments.

The physical properties of H68 brass are also excellent. Its density is approximately 8.47 g/cm³, melting point is between 930°C and 940°C, electrical conductivity is about 27% IACS (International Annealed Copper Standard), thermal conductivity is about 120 W/(m·K), modulus of elasticity is about 105 GPa, tensile strength is about 370 MPa, and hardness is about HB 80-90 (Brinell hardness). These physical properties enable H68 brass to have a wide range of applications in different fields. For example, its good electrical conductivity makes it suitable for manufacturing electronic components such as electrical connectors, terminals, and switches; its good thermal conductivity makes it excellent in fields like heat sinks and heat exchangers; its relatively high tensile strength and hardness allow it to withstand significant stress in mechanical manufacturing.

Due to its good performance, H68 brass is widely used in multiple fields. In the electronics and electrical industries, its good electrical conductivity makes it an ideal material for manufacturing electronic components such as electrical connectors, terminals, and switches. In the field of mechanical manufacturing, due to its high strength and excellent machinability, it is often used to make mechanical parts like gears, bearings, nuts, and bolts. In architectural decoration, due to its aesthetically pleasing golden-yellow color and corrosion resistance, it is often used to make door handles, handrails, and decorative panels. Additionally, H68 brass is commonly used to manufacture complex cold-stamped and deep-drawn parts, such as radiator housings, conduits, bellows, cartridge cases, gaskets, and detonators.

The heat treatment specifications for H68 brass include a hot working temperature of 750–830°C, an annealing temperature of 520–650°C, and a low-temperature stress relief annealing temperature of 260–270°C. Proper heat treatment can significantly improve the performance of H68 brass. For example, hot working can make the material's structure more uniform, improving its strength and plasticity; annealing treatment can eliminate residual internal stress, improving its toughness and stability; low-temperature annealing can further eliminate internal stress, preventing the material from deforming or cracking during use. In actual production, selecting appropriate heat treatment processes based on different needs and process conditions can fully utilize the performance advantages of H68 brass.

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Our factory is equipped with an advanced full-process copper processing production line, specializing in the manufacturing of high-precision copper plates, copper tubes, copper rods, copper wires, and copper strips. The core of our production includes continuous casting and rolling units, precision extrusion lines, high-speed cold rolling equipment, multi-roll precision rolling mills, tube drawing systems, and intelligent stretching production lines. We are also outfitted with comprehensive inspection equipment such as spectrometers and online eddy current flaw detectors, ensuring full-process control from smelting and casting, hot processing, to cold finishing. Our products achieve an accuracy of up to ±0.01mm, with an annual production capacity exceeding 50,000 tons. They are widely used in power, electronics, transportation, and high-end manufacturing sectors. Certified with international standards such as ISO9001 and IATF16949, we are capable of providing global customers with one-stop copper material solutions.

We implement a graded and customized packaging system: copper plates are double-wrapped with moisture-proof paper and vapor corrosion inhibitor film before being placed in reinforced wooden crates, which are filled with cushioning materials and equipped with impact-resistant corner protectors; copper tubes and rods are sealed with plastic end caps, wrapped with PE protective film, and then layered into steel-frame logistics containers, with EPE pearl cotton separating each layer; copper wires are automatically wound onto spools, vacuum-sealed, covered with waterproof film, and secured on customized iron-wood pallets; copper strips are wrapped with non-woven fabric, coiled onto high-strength steel cores, and placed into waterproof composite material coils with desiccants inside. All packaging passes ISTA-3A transport testing, and the outer boxes are labeled with international hazardous material identifiers, moisture warnings, and scannable logistics codes, ensuring the cargo withstands moisture, impact, and chemical erosion during global transportation.

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