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

CuZn40Pb2 Brass

Brass

Grade Name

International Designations:

  • DIN: CuZn40Pb2 (CW617N)

  • China: GB/T 5231 (General specification)

  • UNS: C38010


Product Features

  • Superior Machinability: Lead particles enhance cutting efficiency.

  • Mechanical Excellence: Tensile strength ≥370 MPa, yield strength ≥250 MPa.

  • 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: Φ5mm–Φ150mm, Length: 1m–6m

Sheet

Thickness: 0.5mm–50mm, Width: ≤1000mm

Tube

OD: Φ10mm–Φ200mm, Wall: 1mm–20mm

Wire

Diameter: Φ0.5mm–Φ10mm, Coiled


Chemical Composition (% wt.)

Element

Cu

Zn

Pb

Fe (≤)

Sn (≤)

Others (≤)

Content

57–60

Bal.

1.5–3.5

0.35

0.3

1.0


Physical Properties

Property

Value

Density

8.4 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

≥370

≥250

≥8

≤100

Hard

≥500

≥350

≥5

120–140


Key Advantages

  • Cost Efficiency: Reduces tool wear in CNC machining.

  • Regulatory Compliance: Meets RoHS exemptions for industrial use.

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


Applications

  • Machinery: Gears, bearings, valve bodies.

  • Electronics: Connectors, terminals, precision instruments.

  • Automotive: Brake components, radiators.

  • Construction: Pipe fittings, valve accessories.


Processing Guidelines

  • Hot Working: Avoid prolonged heating to prevent lead vaporization.

  • 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, optical devices.

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

  • Marine Systems: Corrosion-resistant 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 EN 12166-1998 (CW617N), ASTM B505.

  • China: GB/T 5231 (General specification)



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