What is H62 brass?
H62 brass, with 62% copper as its core, combines high strength with excellent machinability, making it a cost-effective choice for machinery manufacturing, electronics, and other fields. Its α+β dual-phase structure balances toughness and hardness, making it suitable for both cold and hot working. It is also corrosion-resistant and has excellent electrical conductivity, making it widely used in ship parts, radiators, and even architectural decoration.
What is the hardness of H62 brass?
| Temper Designation (ASTM/GB) | Condition | Hardness (HV) | Hardness (HB) | Hardness (HRB) | Typical Application State |
|---|---|---|---|---|---|
| O (Annealed) | Soft, fully recrystallized | 70 – 100 HV | ~65 – 85 HB | ~55 – 70 HRB | As-supplied for further cold working or hot forming. |
| H02 (¼ Hard) | Lightly cold worked | 95 – 120 HV | ~80 – 100 HB | ~70 – 80 HRB | A good balance of strength and formability. |
| H04 (½ Hard) | Medium cold worked | 110 – 135 HV | ~95 – 115 HB | ~78 – 88 HRB | Common for many structural and mechanical parts. |
| H06 (Hard) | Heavily cold worked | 130 – 160 HV | ~110 – 135 HB | ~85 – 95 HRB | High-strength applications, limited further forming. |
| H08 (Spring Hard) | Extra hard, full hard | ≥ 150 HV | ≥ 130 HB | ≥ 92 HRB | Used for springs, clips, and high-stress components. |
Chemical Composition
The chemical composition of Brass H62 is characterized by a high copper content, with zinc as the principal alloying element. The typical composition is approximately 61.5% to 63.5% copper and the remainder zinc. Trace elements such as lead (Pb), iron (Fe), and silicon (Si) may be present in minute quantities, affecting the alloy's properties slightly. The composition of H62 is regulated by standards such as GB/T 5231 in China, which ensures consistency in its application.
Metallurgical Structure
H62 brass exhibits a dual-phase microstructure comprising α (alpha) and β (beta) phases. The α-phase is a solid solution of zinc in copper and is predominant in the alloy. It provides ductility and corrosion resistance. The β-phase, which is a more complex intermetallic phase, emerges as zinc content increases. In H62 brass, the β-phase is present in smaller quantities and contributes to the alloy's hardness and strength. The distribution and morphology of these phases are influenced by the cooling rate during solidification and subsequent heat treatment processes.
Crystallographic Structure
The α-phase of H62 brass has a face-centered cubic (FCC) structure, which is typical of copper and its alloys. This structure allows for a high degree of slip and deformation, leading to good ductility. The β-phase, in contrast, has a body-centered cubic (BCC) structure, which is less ductile but contributes to the alloy's overall strength. The crystallographic orientation and grain size of these phases play a crucial role in determining the mechanical properties of the alloy.
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Application Areas
**Machinery Manufacturing**
Manufacturing deep-drawn and bent parts such as pins, rivets, washers, nuts, conduits, pressure gauge springs, and screens.
Used for components requiring high thermal conductivity, such as condenser pipes and heat sinks.
**Electronics & Electrical Engineering**
Manufacturing terminals, switch components, and conductive parts, utilizing their high conductivity and mechanical stability.
**Marine & Marine Engineering**
Manufacturing ship parts and marine engineering equipment, such as propellers, pump shafts, and piping systems, resistant to salt spray corrosion.
**Automotive Industry**
Used for radiator parts, fuel system components, and terminals, adaptable to high-temperature and high-pressure environments.
**Architectural Decoration**
Manufacturing doors, windows, railings, and decorative accessories, utilizing their beautiful and durable golden color and corrosion resistance.
FAQ
| Is H62 brass better than 360 brass? H62 Brass: Offers good strength, ductility, and corrosion resistance, making it suitable for forming and bending operations. 360 Brass: Known for its exceptional machinability due to the added lead, but it is slightly less ductile compared to H62. |
| What is the difference between H65 and H62 brass? H62 brass, with slightly lower copper content, is versatile and widely used in plumbing, electrical components, and hardware. In contrast, H65 brass boasts higher tensile strength, better corrosion resistance, and superior machinability, making it ideal for decorative items, musical instruments, and radiator cores. |
| What is the difference between H59 and H62 brass? Their primary differences lie in their composition; H59 contains slightly less copper, making it more malleable but less corrosion-resistant than H62, which contains higher levels of copper for increased durability and environmental resistance. |
| What is H62? H62 is a brass-zinc alloy containing 60.5–63.5% brass. It has good mechanical properties and electrical conductivity. Although cost-effective, it is susceptible to dezincification corrosion, making it suitable mainly for general structural parts. |
| What is the tensile strength of H62 brass? Tensile strength ≥ 330 MPa, elongation ≥ 10% (in the hard state), excellent cold/hot working performance. Suitable for processes such as stamping, drawing, forging, etc. |
| Is H62 brass machinability? Yes, H62 brass has good machinability, but it is not in the top tier of "free-machining" brasses. Its rating is typically around 40% on the industry-standard scale where free-cutting brass C36000 (CZ121/Alloy 360) is rated at 100%. |
| What is H62 brass strip used for? H62 brass strip is widely used in architectural decoration, electrical terminals, heat exchangers, hardware components, and ammunition casings due to its good strength, formability, and corrosion resistance. |
Our factory
Our modern production base is equipped with advanced full-process production lines dedicated to the manufacturing of copper and copper alloy products. The factory features precision smelting, continuous casting, high-pressure extrusion, high-speed rolling, and precision cutting equipment, ensuring strict control over every step from copper ingot to finished product. We possess strong R&D and customization capabilities, enabling us to produce various specifications and tempers of copper tubes, plates, rods, wires, and ultra-thin foils in accordance with international standards (such as ASTM, EN, JIS) and specific customer requirements. Our products are widely used in various industries, including refrigeration, electronics, power, transportation, and construction.
Copper product packaging
We fully understand that secure packaging is essential for the flawless delivery of products. Tailored to the characteristics of different products, we employ customized professional packaging solutions: copper tubes and rods are typically secured with anti-rust inner liners and sturdy wooden crates or iron-frame boxes to prevent impact and deformation during transit; copper plates, strips, and foils are first covered with protective film, placed in a dry environment, wrapped with waterproof paper and moisture-proof materials, and finally packed into reinforced plywood crates or steel coil boxes to effectively resist moisture and mechanical damage; wires are neatly wound onto wooden or steel reels and firmly strapped. All packaging is clearly labeled and compliant with export standards, ensuring that your goods maintain their excellent factory condition even after long-distance sea transportation and multiple handlings.
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