C3712 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