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

C3712 Brass

Brass

Grade Name

C3712 Lead Brass (Free-Cutting Brass)


Key Features

  • Superior Machinability: Lead particles enhance cutting efficiency for CNC and automatic lathes.

  • High Mechanical Strength: Tensile strength ≥315 MPa, suitable for high-load applications.

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

  • Eco-Friendly Compliance: Pb content varies by standard (0.25–3%), compliant with RoHS regulations.


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

58.0–68.0

Main Component (ASTM B271)

Zn

Balance

Balance

Pb

0.25–3.0

Varies by Standard (JIS/ASTM)

Fe+Sn

≤0.8

DIN 17660


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)

≥315

≥15

50–70 HRB

Hard (H)

≥440

≤10

≥85 HRB


Core Advantages

  • Cost Efficiency: Ideal for mass production of precision components.

  • Versatility: Adaptable to casting, rolling, and cold forging.

  • Aesthetic Appeal: Golden surface polish for decorative applications.


Applications

  • Machinery: Gears, valves, and bearings.

  • Automotive: Radiator parts and brake components.

  • Architecture: Door handles and decorative trims.

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


Processing Guidelines

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

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

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


FAQs

Q1: Differences between C3712 and C3600?

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


Q2: Suitability for marine environments?

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


Standards

  • JIS H3250-2015: Brass rod standards.

  • ASTM B36/B36M: Brass plate and strip standards.

  • EN 12449:1999: Seamless copper tube standards


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