H68 Brass Chemical Composition

Based on previous comprehensive inquiries regarding H68 brass (involving standards such as GB/T 4423-1992 and GB/T 5231-2012), the standard chemical composition parameters for H68 brass are as follows:

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Mechanical Properties:

Tensile Strength (σb): ≥ 370 MPa

Elongation (δ10): ≥ 15%

Elongation (δ5): ≥ 18%

Physical Properties (Comprehensive data from previous analysis):

Density: ~8.47 g/cm³

Melting Point: ~930 – 940 °C

Electrical Conductivity: ~27% IACS

Thermal Conductivity: ~120 W/(m·K)

Modulus of Elasticity: ~105 GPa

Hardness: ~HB 80-100 (varies with state)

Plasticity and Strength: H68 brass is considered to have the best plasticity among standard brass alloys while maintaining relatively high strength.

Machinability: It offers good machinability and weldability, suitable for both cold and hot working. It is commonly used for complex cold-stamped and deep-drawn parts (e.g., bellows, cartridge cases).

Corrosion Resistance: It is generally stable against ordinary corrosion but is susceptible to stress corrosion cracking in ammonia-containing atmospheres.

Heat Treatment Specifications:

Hot Working Temperature: 750 – 830 °C

Annealing Temperature: 520 – 650 °C

Stress Relief Annealing: 260 – 270 °C

Automotive & Aerospace Industries (engine components, connectors, valves)

Precision Machinery (gears, bearings, screws)

Electronics & Electrical Industry (connectors, switches, sockets)

Construction & Decoration

Heat Exchangers and Radiators

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