TPb1 Lead Bronze Mechanical Properties

Detailed Overview of C18700 Material

I. Basic Definition and Correspondences

TPb1: A leaded copper alloy grade in the Chinese standard (GB), corresponding to the international grade C18700. It belongs to high-conductivity free-cutting leaded bronze material.

C18700: A U.S. standard (ASTM) leaded copper alloy with copper as the base (approximately 80%), supplemented with lead (Pb) to enhance machinability. It combines high electrical conductivity (conductivity ≥85% IACS) and corrosion resistance.

II. Core Characteristics and Composition

Composition

Base Element: Copper (Cu) as the primary element, accounting for about 80%.

Alloying Elements: Lead (Pb) content approximately 0.8-1.2%, improving machinability; includes trace impurities such as iron (Fe) and zinc (Zn) (total ≤0.3%).

Physical and Mechanical Properties

Conductivity: Electrical conductivity ≥85% IACS, suitable for high-frequency conductive applications.

Machinability: Turning performance reaches 85%, with excellent cold and hot working properties and easy weldability.

Strength: Hardness approximately 112 HV, tensile strength ≥390 MPa, meeting high-load requirements.

Corrosion Resistance

Stable performance in humid and saline environments, applicable in marine engineering and electronic equipment.

III. Core Application Areas

Electronics and Electrical Engineering

Precision conductive components such as connectors, terminals, and motor switch parts.

Mechanical Manufacturing

Threaded cutting parts, high-conductivity bolts, replacing traditional cadmium bronze (with significant environmental advantages).

Industrial Piping

Corrosion-resistant pipes, condenser tubes, and other fluid transmission systems.