What are CuZn39Pb1 and CuZn39Pb3 brass equivalent to?

When working with brass materials, it's important to understand the differences between common grades. This blog introduces CuZn39Pb3 and its international equivalents. It also compares this alloy with CuZn39Pb1, CuZn37, and CuZn30. These brass types are widely used in machining, forming, and structural parts. If you're looking for the right brass for your application, this guide will help you choose.

1. CuZn39Pb3

• Composition: ~58–60% Copper, ~39% Zinc, ~3% Lead

• Type: Free-machining leaded brass

• Properties: Excellent machinability, good strength, easy to cut on automatic lathes, not suitable for welding

• Common Uses: Screws, connectors, valves, plumbing parts

International Equivalents:

• Composition: ~60% Copper, ~39% Zinc, ~1% Lead

• Type: Low-lead free-machining brass

• Properties: Good machinability (lower than CuZn39Pb3), better formability, improved pressure tightness, more environmentally friendly

• Common Uses: Fittings, plumbing parts, components where lead content must be reduced

International Equivalents:

• Composition: ~63% Copper, ~37% Zinc

• Type: Alpha brass (lead-free)

• Properties: Good cold forming, deep drawability, fair strength, good corrosion resistance

• Common Uses: Stamped parts, utensils, automotive and decorative components

International Equivalents:

4. CuZn30

• Composition: ~70% Copper, ~30% Zinc

• Type: Alpha brass

• Properties: Very good cold forming, high ductility, excellent for bending and deep drawing, good corrosion resistance

• Common Uses: Radiator tubes, lamp fixtures, industrial hoses

International Equivalents: