C37700 Brass

Grade Name

UNS Number: C37700
Common Name: Leaded Brass (CuZn38Pb2)
Corresponding Standards: ASTM B453 (Leaded Brass Rod/Bar), ASTM B121 (Leaded Brass Sheet/Strip), SAE J463, YS/T 649-2018.

Product Features

Superior Machinability: Enhanced by 1.5–2.5% lead content, ideal for high-speed CNC and automatic machining.
Good Corrosion Resistance: Resists atmospheric and freshwater corrosion but limited in saltwater or ammonia-rich environments.
Balanced Mechanical Properties: Combines tensile strength (260–655 MPa) with elongation (24–50%).
Thermal and Electrical Conductivity: Moderate thermal (121 W/m·K) and electrical conductivity (24–27% IACS).
Cost-Effective: Optimized for mass production due to lower copper content (58–61%).

Common Product Forms & Dimensions

Form	Thickness (mm)	Width (mm)	Length (mm)	Diameter (mm)
Sheet/Strip	0.3 – 6.0	50 – 600	Custom	-
Rod/Bar	-	-	Custom	3 – 150
Tube	1.0 – 15.0 (wall)	-	Custom	10 – 250 (OD)
Wire	-	-	Custom	0.5 – 12
Note: Custom dimensions are available upon request.

C37700 Brass Chemical Composition

Element	Cu	Zn	Pb	Fe	Others
Weight %	58–61	Balance	1.5–2.5	≤0.30	≤0.8 (total)
Complies with ASTM B453 and YS/T 649-2018 standards.

Physical Properties

Property	Value
Density (g/cm³)	8.44–8.53
Melting Point (°C)	895–940
Electrical Conductivity (%IACS)	24–27 (Annealed)
Thermal Conductivity (W/m·K)	121 (at 20°C)
Values vary with processing conditions.

Mechanical Properties

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HV)
Annealed	260–440	100–200	35–50	75–100
Cold Worked (H02)	450–550	350–450	15–25	120–160
Hard (H04)	≥550	≥450	≥5	≥160
Data applies to standard thicknesses and processing states.

Core Advantages

1. Free-Machining: Lead lubrication reduces tool wear, enabling high-precision machining.

2. Versatility: Suitable for cold/hot forming, welding, and extrusion.

3. Durability: Resists wear in mechanical and low-corrosion environments.

4. Cost Efficiency: Lower copper content reduces material costs for industrial applications.

Product Applications

Marine Engineering: Seawater valves, heat exchangers, and ship fittings.
Automotive: Radiator cores, fuel system components, and stamped parts.
Plumbing: Low-pressure fittings, valve bodies, and couplings.
Electronics: Connectors, terminals, and shielding components.
Industrial Hardware: Gears, bushings, and fasteners.

Processing Considerations

Annealing: 600–650°C for 1–2 hours to restore ductility.
Machining: Use sharp carbide tools with lubricants to minimize heat generation.
Welding: Avoid overheating to prevent lead vaporization; TIG/MIG welding with inert gas shielding recommended.
Surface Treatment: Electroplating (e.g., nickel or chrome) for enhanced corrosion resistance.

Key Application Scenarios

Shipbuilding components requiring seawater corrosion resistance (with coatings).
High-volume automotive parts produced via CNC machining.
Electrical connectors in consumer electronics.
Industrial fasteners and hydraulic systems.

FAQs

Q1: Is C37700 suitable for drinking water systems?

A: No, due to lead content (1.5–2.5%), it is restricted under RoHS and NSF/ANSI 61 for potable water.

Q2: How does C37700 compare to C36000 brass?

A: C36000 has higher lead content (3.7% max), offering better machinability but lower environmental compliance.

Q3: Can C37700 material be recycled?

A: Yes, but specialized processes are required to manage lead safely.

Standard References

Standard	Description
ASTM B453	Leaded brass rod, bar, and shapes.
ASTM B121	Leaded brass sheet and strip.
SAE J463	Mechanical property standards for wrought copper alloys.
YS/T 649-2018	Chinese standard for extruded copper alloy bars.

Note: Specifications may vary slightly depending on manufacturer and processing methods. Always consult technical datasheets for critical applications.

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