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

C3501 Brass

Brass

Grade Name

C3501 Lead Brass (Free-Cutting Brass)


Key Features

  • Superior Machinability: Free-cutting performance due to dispersed lead particles.

  • Balanced Mechanical Properties: Suitable for cold/hot working and welding.

  • Corrosion Resistance: Stable in dry and freshwater environments, but avoid acidic/seawater exposure.

  • Eco-Friendly: RoHS-compliant with Pb ≤0.05%.


Product Forms & Dimensions

Form

Size Range

Standards

Rod

Diameter 2–300mm, Length 1–12m

JIS H 3250-1992

Plate

Thickness 0.5–60mm, Width 100–2000mm

ASTM B36/B36M

Wire

Diameter 0.2–12mm, Coil ≥3kg

JIS H 3300-2018

Tube

OD 5–300mm, Wall Thickness 0.5–30mm

EN 12449: 1999

Strip

Thickness 0.1–2.5mm, Width ≤250mm

ASTM B134


Chemical Composition

Element

Content (%)

Standard Range

Cu

Balance

Main Component (JIS H 3100)

Zn

Primary Alloy

Balance

Pb

≤0.05

RoHS Limit

Fe

≤0.10

ASTM B36

Impurities

≤0.3

JIS H 3100


Physical Properties 

Property

Value/Description

Density

8.75 g/cm³

Melting Point

930–980℃

Electrical Conductivity

25% IACS (20℃)

Thermal Conductivity

115 W/(m·K)

Thermal Expansion

20×10⁻⁶/℃ (20–300℃)


Mechanical Properties

Condition

Tensile Strength (MPa)

Elongation (%)

Hardness (HRB)

Annealed (O)

235–345

≥30

50–65 HRB

Half-Hard (H02)

345–440

≥20

70–80 HRB

Hard (H04)

≥440

≤10

≥85 HRB


Core Advantages

  • Cost Efficiency: Lower production cost compared to high-copper alloys.

  • Precision Machining: Ideal for CNC and automatic lathe processing.

  • Surface Versatility: Compatible with plating, polishing, and coatings.


Applications

  • Machinery: Valves, bearings, and gears.

  • Electronics: Connectors, terminals, and shielding components.

  • Hardware: Locks, screws, and door handles.

  • Automotive: Radiator parts and brake system components.


Processing Guidelines

  • Machining Priority: Use CNC tools to avoid brittleness at 200–600℃.

  • Annealing: 600–700℃ to relieve stress and improve ductility.

  • Surface Protection: Apply nickel plating or passivation for corrosion resistance.


FAQs

Q1: Differences between C3501 and C3600?

A: C3600 has higher Pb (2–3%) for better machinability but lower strength.


Q2: Is C3501 suitable for marine use?

A: Not recommended for seawater; use protective coatings if necessary.


Standards

  • JIS H 3100-2018: Sheets, plates, and strips.

  • ASTM B36/B36M: Brass plates and strips.

  • EN 12449: 1999: Seamless copper tubes.


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