T2 Purple Copper Strips Flat Bars Square Bars and Blocks High-Quality Solid Copper Strips and Flat Bars 2-10MM Thickness

Professional English Translation: Production Process Route (Fully Automated Full-Process Control)

1.Raw Material Selection Premium Grade 1 cathode copper (Cu-CATH-2) sourced from leading electrolytic copper plants in Guizhou, Jiangxi, and other regions, with total impurities strictly controlled at ≤ 35 ppm.

2.Melting Process Dual-furnace melting using power-frequency + medium-frequency induction furnaces, protected throughout by a composite covering agent of charcoal + high-purity graphite, and fully shielded with nitrogen/argon atmosphere to minimize oxygen pickup. Melt oxygen content stably controlled at 5–15 ppm.

3.Semi-Continuous Casting Upward continuous casting (up-drawing method) with high-purity graphite crystallizer. Traction parameters precisely controlled (drawing speed, pause time, and reverse push time strictly synchronized). Ingot weight: 1.5–2.5 tons, ensuring refined internal grain structure and no significant segregation.

4.Heating Regime Three-zone gas-fired homogenizing furnace, uniform heating at 800–850 °C, holding time ≥ 4 hours, effectively eliminating as-cast porosity and compositional segregation.

5.Hot Extrusion 3200–5000 ton hydraulic press, extrusion ratio 30–80, extrusion barrel temperature 750–800 °C, exit speed 30–80 mm/s, resulting in surface free of orange-peel texture and dense internal microstructure.

6.Drawing / Roller Leveling Multi-pass cold drawing combined with medium-frequency annealing (580–620 °C under protective atmosphere). Dimensional tolerance achievable to ±0.10 mm, or ±0.05 mm for special requirements.

7.Finishing Six-roll straightener + centerless grinding, achieving surface roughness Ra ≤ 0.8 μm (Ra 0.4 μm available upon customer request).

Key Quality Performance Indicators (2024–2025 Batch Averages)

● Copper purity: 99.97–99.99%
● Oxygen content: ≤ 10 ppm
● Electrical conductivity: ≥ 101.5% IACS (20 °C)
● Elongation A50mm: ≥ 38%
● Grain size: 0.015–0.035 mm (post-hot extrusion condition)
● Spiral tendency (1 m torsion test): ≤ 5 mm
● Dimensional tolerance: Standard ±0.15 mm; precision-drawn batches ±0.08 mm
● Surface defects: Free of cracks, folds, inclusions, and orange-peel texture
● Eddy current testing: Compliant with GB/T 5126 Class B