H85 Brass

Designation and Standards

• Standard Designation: H85 (Common Brass)

• International Equivalent Grades: ASTM C75200 (American Standard), JIS C7521 (Japanese Standard)

• Applicable Standards: GB/T 5231-2012 (Wrought Brass), GB/T 4423-2007 (Bars)

• Material Type: Copper-Zinc Alloy (Cu-Zn), Copper Content84.0%-86.0%, Zinc Balance.

  
  

Product Features

• High Strength and Ductility Balance: Tensile strength ≥315 MPa, Elongation δ10 ≥25%, suitable for both cold and hot working.

• Excellent Corrosion Resistance: Good corrosion resistance in atmospheric, freshwater, and mildly corrosive environments with no tendency for stress corrosion cracking.

• Superior Electrical and Thermal Conductivity: Electrical conductivity of approximately 15% IACS and thermal conductivity of 75-85 W/(m·K), ideal for electrical and thermal dissipation components.

• Versatile Processing Capability: Supports processes such as cold rolling, hot rolling, welding, and forging, with easy formability.

Common Product Forms and Dimensions

Chemical Composition

Physical Properties

Mechanical Properties

Core Advantages

• Balanced Comprehensive Performance: Excellent strength, ductility, and corrosion resistance, ideal for complex processing needs.

• Cost-Effectiveness: Lower cost compared to special brasses (e.g.,Leaded Brass), suitable for large-scale industrial applications.

• Versatile Product Forms: Available in bars, plates, tubes, and wires to meet customization demands.

  
  

Product Applications

• Mechanical Engineering: Bearings, gears, and screws requiring high wear resistance and mechanical strength.

• Electrical Engineering: Wires, switch contacts, and radiator components requiring electrical and thermal conductivity.

• Automotive Industry: Brake system components and cooling pipelines balancing pressure resistance and corrosion resistance.

• Construction Engineering: Plumbing pipes and window accessories offering corrosion resistance and aesthetics.

Processing Considerations

• Hot Working Parameters: Hot rolling temperature range: 750-830℃. Avoid zinc volatilization to maintain material properties.

• Annealing Process: Annealing temperature: 520-650℃ to eliminate cold work hardening; low-temperature annealing at 260-270℃ to eliminate interior stress.

• Welding Recommendations: Prefer argon protected welding to minimize porosity defects.

• Cold Working Control: Single deformation should be limited to ≤20%. Multiple processes require annealing to restore ductility.

Frequently Asked Questions

Q: What is the difference between H85 and common brass like H62?

A: H85 has a higher copper content (84%-86%), providing significantly better strength, corrosion resistance, and conductivity than H62, though at a slightly higher cost.

Q: Is H85 suitable for marine environments?

A: It has good direct corrosion resistance but for long-term use, nickel plating or anti-corrosion coating is recommended.

Q: How to prevent edge cracking of cold rolled plates?

A: Control the rolling deformation amount (≤20% per pass), apply stress relief treatments before annealing, and ensure the roller surface is smooth.

Reference Standards

• Chemical Composition and Processing Standards: GB/T 5231-2012, ASTM B36 (American Standard for Plates).

• Mechanical Performance Testing: GB/T 228.1 (Metal Tensile Test), JIS H3250 (Japanese Standard).

Note: The above data is consolidated from multiple industry standards and technical documents. Actual parameters may vary slightly depending on production processes. Refer to supplier test reports for precise values.