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

C3603 Brass

Brass

Grade Name

C3603 Lead Brass (Free-Cutting Brass)


Key Features

  • Superior Machinability: Lead (1.8–3.7%) enhances cutting efficiency for CNC and automatic lathes.

  • High Mechanical Strength: Tensile strength ≥315 MPa (annealed), up to ≥450 MPa (hard state).

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

  • Eco-Challenges: Complies with RoHS exemptions but faces restrictions due to lead content.


Product Forms & Dimensions

Form

Size Range

Standards

Rod

Diameter 2–300mm, Length 1–12m

JIS H3250-2015

Plate

Thickness 0.5–60mm, Width 100–2000mm

ASTM B36/B36M

Wire

Diameter 0.2–12mm, Coil ≥3kg

JIS H3300-2018

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

57.0–61.0

Main Component (JIS H3250)

Zn

Balance

Balance

Pb

1.8–3.7

Enhances Machinability

Fe+Sn

≤0.6

Impurity Control

Impurities

≤1.2

Total Limit


Physical Properties

Property

Value/Description

Density

8.75 g/cm³

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/HV)

Annealed (O)

≥315

≥15–20

50–65 HRB

Half-Hard (H02)

≥365

≥10

HV≥100

Hard (H)

≥450

≤10

HV≥130


Core Advantages

1. Cost-Effective Machining: Reduced tool wear for mass production.

2. Versatility: Adaptable to cold/hot working and welding.

3. Surface Compatibility: Supports plating and passivation for enhanced durability.


Applications

  • Machinery: Gears, valves, bearings, and fasteners.

  • Automotive: Radiator components and brake systems.

  • Electronics: Connectors and relay housings (with coatings).

  • Renewable Energy: Solar collectors and heat exchanger pipes.


Processing Guidelines

  • Machining Parameters: Cutting speed 60–120 m/min; avoid 200–600℃ brittleness zone.

  • Annealing: 600–700℃ for 1–2 hours to relieve stress.

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


FAQs

Q1: Differences between C3603 and C3600?

A: C3600 has higher Pb (2–3.7% vs. 1.8–3.7%) for better machinability but lower strength.


Q2: Suitability for marine environments?

A: Not recommended for long-term seawater exposure; use protective coatings.

Standards

  • JIS H3250-2015: Copper and copper alloy rods.

  • ASTM B36/B36M: Brass plates and strips.

  • EN 12449:1999: Seamless copper tubes.


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