What is H62 brass?
H62 brass tubing is a copper-zinc alloy tubing with a copper content of approximately 62%, conforming to national standards for impurity content, particle size, softening temperature, and other indicators. This product possesses excellent hot-state plasticity, machinability, and corrosion resistance, making it suitable for brazing, welding, and deep processing. It is widely used in welding applications in industries such as petroleum, chemical, food, aerospace, and construction, and its mechanical properties include a tensile strength of not less than 390 MPa.
H62 brass hardness
| 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. |
Key Factors Affecting Hardness
Cold Work (Strain Hardening): This is the primary method to increase hardness. Drawing, rolling, or stamping the material introduces dislocations, making it harder and stronger but less ductile.
Annealing: Heating the material to 450-650°C followed by controlled cooling fully softens it (O temper), resulting in minimum hardness and maximum ductility.
Grain Size: Finer grain size (achieved by controlled processing) generally leads to slightly higher hardness and strength (Hall-Petch effect).
Chemical Composition: Minor variations within the H62 specification (e.g., Cu content near 60.5% vs. 63.5%) can slightly influence the baseline hardness.
Hardness Conversion Considerations
The values in the table above are approximate equivalents. Exact conversion is not perfect and depends on the material's specific work history.
For critical specifications, always refer to the test method and scale defined in the procurement standard (e.g., GB/T 5231 may specify HB or HV).
A general rough guide for H62 in the common ranges:
80 HB ≈ 105 HV ≈ 72 HRB
100 HB ≈ 125 HV ≈ 80 HRB
120 HB ≈ 145 HV ≈ 88 HRB
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Application Guidance by Hardness
Low Hardness (O Temper, <100 HV): Ideal for complex cold forming (deep drawing, severe bending), hot forging, and where maximum machinability with long tool life is desired.
Medium Hardness (H02-H04, 100-135 HV): The most common range for general-purpose components like hardware fittings, fasteners, valves, and connectors. Offers a optimal balance.
High Hardness (H06-H08, >135 HV): Used for spring contacts, high-strength structural parts, and components requiring good wear resistance and minimal deformation under load.
Important Note on "As-Cast" Hardness
H62 is rarely used in cast form. It is primarily a wrought alloy (rolled, drawn, extruded). If cast, its hardness would be inconsistent and generally not specified. For casting, dedicated cast brass alloys (e.g., ZCuZn40Pb2) are preferred.
For precise requirements, always specify the desired temper condition (e.g., H04) or a hardness range with test method (e.g., 115-125 HB) when ordering material from your supplier, referencing the appropriate standard (e.g., GB/T 4423 for bars).
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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.
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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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