C3501 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 JIS C3501 and C3600?

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

Q2: Is JIS C 3501 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.