Designation and Standards
Standard Designation: H68 (Common Brass)
International/National Standards: GB/T 5231-2012, GB/T 2059-2000 (Strips)
Other Name: Arsenical Brass (H68A with trace arsenic for enhanced corrosion resistance)
Material Category: Copper-Zinc Alloy (Cu-Zn), Copper content 67.0%-70.0%, Zinc as the remainder.
Product Features
Excellent Plasticity: H68 has the best plasticity among commom brass, with outstanding cold and hot working ability, making it suitable for deep drawing, bending, and other complex forming processes.
High Strength and Ductility Balance: Tensile strength ranges widely (M≥290 MPa, up to 660 MPa9(Y)).
Corrosion Resistance: Good resistance to freshwater and atmospheric corrosion. However, it is susceptible to stress corrosion cracking in ammonia and seawater environments (corrosion rate approximately 0.1 mm/a).
Versatile Processability: Supports cold rolling, hot rolling, welding, soldering and brazing, making it ideal for shell casings and precision components.
Common Product Forms and Specifications
|
Product Form |
Specification Range |
Typical Applications |
|
Plate |
Thickness 0.2-100mm, Width 305-1000mm |
Architectural decoration, instrument housings |
|
Strip |
Thickness 0.01-3.0mm |
Electronic components, metal meshes |
|
Tube |
Outer diameter 6-530mm, Wall thickness 0.5-50mm |
Condenser tubes, radiators |
|
Bar |
Diameter 4-350mm, Length 2500-6000mm |
Mechanical parts, Shell casings |
|
Wire |
Diameter 0.1-12.7mm |
Welding wires, Spring components |
|
Element |
Cu |
Zn |
Pb |
Fe |
Total Impurities |
As (H68A) |
|
Content (%) |
67.0-70.0 |
Remainder |
≤0.03 |
≤0.10 |
≤0.3 |
Trace Addition |
Physical Properties
|
Property |
Value |
Remarks |
|
Density |
8.5 g/cm³ |
Lightweight design advantage |
|
Thermal Conductivity |
116.7-141.7 W/(m·K) |
Close to pure copper, suitable for heat dissipation components |
|
Melting Point |
966-1001℃ |
Alloy melting range |
|
Coefficient of Thermal Expansion |
19.1×10⁻⁶/℃ (20-300℃) |
Good thermal stability |
|
Electrical Conductivity |
~32% IACS (M) |
Lower than pure copper, sufficient for general conductivity needs |
Mechanical Properties
|
Property |
Value |
Test Condition |
|
Tensile Strength (σb) |
370-660 MPa |
M≥290 MPa, Y ≥660 MPa |
|
Elongation (δ10) |
≥15% (Y) |
Up to 45% (M) |
|
Hardness (HV) |
55-190 |
Higher hardness (Y) |
|
Annealing Temperature |
520-650℃ (Conventional Furnace Annealing) |
Eliminate cold work hardening |
|
Low-Temperature Annealing |
260-270℃ |
Relieve internal stress |
Core Advantages
Outstanding Comprehensive Performance: Best plasticity among brasses with balanced strength, suitable for deep drawing and bending.
Environmental Corrosion Resistance: Longer service life in freshwater and atmospheric environments compared to common carbon steel.
Versatile Product Forms: Available in plates, tubes, wires, and more to meet industrial customization needs.
Main Application Fields
Military Manufacturing: Shell casings, weapon components (core application).
Electronics and Electricals: Waveguides, heat sink casings, connectors.
Construction and Marine: Condenser tubes, decorative grilles, plumbing fittings (marine protection recommended).
Industrial Equipment: Pump bodies, valves, cold-formed parts, chains.
Processing Considerations
Temperature Control: Hot working temperature should be maintained at 750-830℃ to avoid zinc evaporation and performance degradation.
Annealing Process: Perform low-temperature annealing at 260-270℃ after cold working to mitigate stress corrosion risks.
Welding Requirements: Preferably use argon protected welding to reduce porosity defects.
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Our factory
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.
Brass product packaging
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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