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Ningbo Jintian Copper (Group) Co., Ltd.
Ningbo Jintian Copper (Group) Co., Ltd.
Code
Brass

CuZn39Pb3 Brass

Brass

Grade Name

International Designations:

  • DIN: CuZn39Pb3 (2.0401)

  • China: GB/T 5231 (General specification)


Product Features

  • Superior Machinability: Lead particles enhance cutting efficiency.

  • Wear Resistance: High hardness (HB 70–140) for friction-intensive applications.

  • Corrosion Resistance: Stable in humid environments; coatings required for marine use.

  • Forming Flexibility: Supports cold/hot forming and achieves high strength after cold working.


Common Forms & Dimensions

Form

Dimensions

Bar

Diameter: Φ6mm–Φ80mm, Length: 1m–6m

Sheet

Thickness: 0.5mm–20mm, Width: ≤1000mm

Tube

OD: Φ6mm–Φ100mm, Wall: 1mm–20mm

Wire

Diameter: Φ0.1mm–Φ6mm, Coiled


Chemical Composition (% wt.)

Element

Cu

Zn

Pb

Fe (≤)

Others (≤)

Content

57–60

Bal.

2.5–3.5

0.35

0.5


Physical Properties

Property

Value

Density

8.4–8.5 g/cm³

Melting Point

900–930°C

Electrical Conductivity

28% IACS (20°C)

Thermal Conductivity

115 W/(m·K) (20°C)

Thermal Expansion

20.2×10⁻⁶/K (20–300°C)


Mechanical Properties (By Condition)

Condition

Tensile Strength (MPa)

Yield Strength (MPa)

Elongation (%)

Hardness (HB)

Soft

≥340

≤190

≥25

70–90

Half-hard

≥410

≥230

≥10

100–120

Hard

≥500

≥350

≥5

120–140


Key Advantages

  • Cost Efficiency: Reduced tool wear in CNC machining.

  • Regulatory Compliance: Meets RoHS exemptions for industrial use.

  • Durability: Balances strength (≥500 MPa) and ductility (≥5% elongation).


Applications

  • Machinery: Bearings, gears, screws, nuts.

  • Electronics: Terminals, sockets, connector pins.

  • Construction: Door handles, hinges, locks.

  • Automotive: Valve bodies, bearing cages.


Processing Guidelines

  • Hot Working: Permitted but avoid prolonged heating.

  • Cold Working: Annealing required after cold forming.

  • Welding: Not recommended; use protective gas if necessary.

  • Surface Treatment: Ni/Cr plating advised for marine environments.


Key Application Scenarios

  • Precision Components: Watch parts, pen tips, optical devices.

  • Wear-Resistant Parts: Bushings, shafts, lock cylinders.

  • Corrosion-Resistant Systems: Marine fittings (with coatings).


FAQ

Q1: Is it eco-friendly?

A: Contains lead; complies with RoHS exemptions for industrial use.


Q2: Can it be used in potable water systems?

A: Not recommended; choose lead-free alternatives.


Q3: How to improve seawater resistance?

A: Apply Ni/Cr coatings and conduct regular maintenance.


Standards Reference

  • International: DIN 17672-1-1983 (Germany).

  • China: GB/T 5231 (General specification).



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