Copper Bar｜High Strength, Consistent Conductivity for Precision Industrial Applications

Key Industry ChallengesIn the mold, machinery, and electronics industries, manufacturers frequently encounter issues such as rapid wear of copper parts, unstable electrical conductivity, or deformation when used in high-temperature environments. These problems often lead to premature part failure, particularly in high-impact applications like EDM electrodes or mold inserts. While pure copper (C1100) offers excellent conductivity, it has low hardness, making it unsuitable for prolonged compression or vibration exposure.

Root Cause of the Problem

Pure copper lacks strengthening alloy elements in its microstructure. Under mechanical stress or elevated temperatures, it is prone to creep and wear, resulting in loss of dimensional accuracy and potential damage to mold parts. To address this, industries have increasingly adopted phosphor bronze a copper alloy engineered for both high mechanical strength and stable electrical conductivity.

Solution

Yamaichi Special Steel (Thailand) offers copper bars manufactured to JIS H3110 standards, using high-quality Japanese cold rolling and annealing technology. The material contains approximately 6% tin (Sn) and 0.03% phosphorus (P), improving hardness, wear resistance, and elastic recovery under load delivering both mechanical strength and consistent conductivity.

C5191 Copper Properties

C5191 copper has a tensile strength of approximately 540–640 MPa, and hardness in the range of HV 130–200, depending on annealing conditions. It offers electrical conductivity of about 15–20% IACS and thermal conductivity of 60–70 W/m·K. The bars are finished with a bright polish and centerless ground surface, making them ready to use without additional processing.

Key Features

• Up to 3 times stronger than pure copper
• Excellent resistance to wear and impact
• Stable electrical conductivity even under high temperatures
• High elastic recovery – ideal for spring and contact parts
• Easy to machine, drill, and polish
• Smooth surface and precise dimensions – ready to use

Yamaichi Copper Bar Advantages

• Manufactured to Japanese standards, ISO 9001:2015 certified
• Smooth and precise surface via Centerless Ground Finish
• Available in stock sizes from 3 – 100 mm, with cut-to-length service
• Balanced electrical conductivity and mechanical strength
• Suitable for specialized uses: EDM electrodes, mold inserts, spring pins, and contact parts

※ For more details, please contact us or download the brochure.

Glossary

• Phosphor Bronze: copper-tin alloy with added phosphorus to enhance strength and wear resistance
• IACS: International Annealed Copper Standard (100% IACS = conductivity of pure copper)
• Bright Finish: A polished metal surface with a glossy appearance
• Elastic Recovery: The ability of a metal to return to its original shape after deformation

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