1. Melting and casting process

The production of C17300 copper rod uses scrap copper as the main raw material, and is efficiently recycled through electric furnace melting. The melting temperature is controlled between 1050°C and 1400°C. The specific process includes:

Sorting and pretreatment: The scrap copper is packaged after manual sorting to remove impurities and ensure uniform composition.

Smelting and slag removal: Add slag removers (such as silicates) to remove oxide slag, and reduce hydrogen residues through nitrogen degassing to improve alloy purity.

Composition adjustment: After smelting, the copper water is analyzed twice, and alloy elements such as electrolytic copper and cobalt are added to meet the requirements of ASTM B196 standard.

Electroslag remelting: Some processes use secondary smelting in an electric slag furnace (1700°C) to further remove impurities and refine grains to improve material density.

2. Rolling and forming technology

Extrusion and rolling: forward/reverse extrusion process, combined with pass rolling or planetary rolling, to ensure the cross-section accuracy of the bar; special die design solves the die wear problem caused by high beryllium content.

Stretching process: cold drawing the billet through a chain or hydraulic stretching machine, the dimensional accuracy can reach ±0.05mm, and the surface roughness Ra≤0.8μm.

Composite process path: the typical process is "pressing-rolling-stretching-annealing-finishing", taking into account both efficiency and performance optimization.

3. Heat treatment process

Solution treatment: 780-820°C insulation for 1-2 hours/25mm thickness, then water quenching to form a supersaturated solid solution and eliminate processing stress.

Aging strengthening: insulation at 320°C for 2-4 hours, BeCu phase nanoparticles are precipitated, the tensile strength is increased from 920MPa to 1590MPa, and the hardness HRC reaches 39-45.

Oxygen-controlled environment: treatment under vacuum or nitrogen protection to avoid surface oxidation and performance degradation.

4. Surface treatment technology

Passivation treatment: Activate the surface with nitric acid-sulfuric acid mixed pickling, and then electrochemical passivation to form a dense oxide film, which can withstand 500 hours of corrosion-free salt spray test.

Functional coating: For electrical applications, tin plating (conductivity loss <5%) or organic protective film coating (maintain natural color) can be selected.

Product advantages of C17300 copper rod

1. Excellent physical properties

Electrical and thermal conductivity: electrical conductivity 18-50% IACS, thermal conductivity 110 W/(m·K), with high conductivity and heat dissipation capacity, suitable for high-density electronic packaging.

Thermal stability: thermal expansion coefficient 17×10⁻⁶/°C (20-200°C), dimensional stability at high temperature is better than phosphor bronze.

2. Outstanding mechanical properties

Strength and elasticity: The tensile strength after aging reaches 1260-1590MPa, and the elastic modulus is 13400 kg/mm², which is suitable for high-load springs and diaphragm box elements.

Wear resistance: Hardness HRC 39-45, friction coefficient is 40% lower than brass, and service life is extended by more than 3 times.

3. Processing performance advantages

Cutting performance: Contains 0.2-0.6% lead to form fine chips, tool life is extended by 50%, and it is suitable for precision machining on automatic lathes.

Forming adaptability: The cold processing rate can reach 80%, supporting complex cross-section extrusion; hot processing is limited to 650-800°C hot extrusion to avoid hot brittleness.

4. Diversified application scenarios

Electronic industry: RF connectors, PCB test probes (relying on high conductivity and elasticity).

Mold manufacturing: injection mold inserts, die-casting punches (outstanding high temperature wear resistance).

Special equipment: explosion-proof tools (spark-free characteristics), aerospace bellows (excellent fatigue resistance).