HPb59-1 Brass

Designation and Standards

• Standard Designation: HPb59-1 (Leaded Brass)

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

• International Equivalent Grades: ASTM C37700 (American Standard), JIS C3771 (Japanese Standard)

• Material Category: Copper-Zinc-Lead Alloy (Cu-Zn-Pb), Copper content 57.0%-60.0%, Lead content 0.8%-1.9%, Zinc balance (approximately 38%-41%).

  
  

Product Features

• Excellent Cutting Performance:

  The addition of lead significantly improves machinability, making it suitable for precision turning, milling, and other automatic machine tool processing, with high surface finish.

  Cutting chips break easily, improving machining efficiency, earning it the title "Free Cutting Brass".

• Balanced Mechanical Properties:

  Tensile strength ≥380 MPa, offering a balance of medium strength and wear resistance, but poor cold working performance (not suitable for cold heading or cold stamping).

• General Corrosion Resistance:

  Corrosion resistance is acceptable in dry atmosphere and fresh water, but it is susceptible to dezincification corrosion in humid or sulfur-containing environments.

• Environmental Restrictions:

  High lead content (0.8%-1.9%) requires careful use in scenarios subject to RoHS and other environmental regulations.

  
  

Chemical Composition

Physical Properties

Mechanical Properties

Common Product Forms and Specifications

Core Application Areas

• Mechanical Manufacturing:

Valve Parts: Valve cores, valve stems (requiring high wear resistance and machining precision).

Hardware Parts: Locks, faucet bodies, gear blanks.

• Electronics and Electrical:

Connectors: Plugs, sockets (requiring precision turning).

• Automotive Industry:

Fuel System Parts: Nozzles, fuel pipe connectors (requiring pressure resistance and machining adaptability).

• Watches and Instruments:

Precision Parts: Watch gears, instrument screws (requiring high surface finish).

Processing Considerations

• Not Suitable for Cold Working:

Cold heading and cold stamping may cause cracking, only suitable for hot working or cutting operations.

• Annealing Process:

After hot working, anneal at 500-600°C to eliminate internal stress.

• Cutting Lubrication:

It is recommended to use sulfur- or chlorine-containing cutting fluids to improve surface quality.

• Environmental Compliance:

Lead-containing materials must comply with RoHS exemption clauses or be used in specific industrial scenarios.

Frequently Asked Questions

Q: What is the difference between HPb59-1 and HPb63-3?

A: HPb63-3 has a higher copper content (62%-65%) and a higher lead content (2.4%-3.0%), offering superior cutting performance but at a higher cost. HPb59-1 offers better cost-performance ratio, suitable for general-purpose parts.

Q: Is it suitable for seawater environments?

A: It is not recommended for direct use in seawater; the corrosion rate is approximately 0.15 mm/year, and nickel plating or a protective coating is required.

Q: How to avoid lead contamination during processing?

A: Equip with dust extraction devices during processing, and dispose of waste as hazardous waste to avoid human or environmental contact.

Standard References

• Chemical Composition and Processing Specifications: GB/T 5231-2012, GB/T 4423-2007 (Bars).

• International Standards: ASTM B124 (American standard for bars), JIS H3250 (Japanese Standard).

Note: The above data is compiled from national standards and industry technical documents; actual parameters may vary slightly due to differences in production processes. For specific parameters, refer to the supplier's test report.