Production process and product advantages of C71500 copper plate and copper strip

I. Production process of C71500 copper plate

Key process flow

Raw material preparation: Select high-purity copper (about 70%) and nickel (about 30%), supplemented with trace elements such as iron and manganese, and ensure that the chemical composition meets the standard through precise proportioning.

Smelting: Use medium-frequency induction furnace or electric furnace, control the temperature at 1200-1300℃, reduce oxidation through argon protection, and add deoxidizer (such as phosphor copper alloy) to improve the purity of the melt.

Casting: The melt is poured into a mold or horizontal continuous casting machine to form a billet. The continuous casting process can reduce shrinkage and segregation.

Heat treatment: Annealing temperature 650-750℃, keep warm for 1-2 hours, furnace cooling or air cooling to eliminate internal stress and refine grains; solution treatment (950-1050℃) is used to optimize high temperature performance.

Surface treatment: pickling (sulfuric acid or hydrochloric acid solution, 40-60℃) to remove oxide scale, mechanical polishing or electroplating (nickel/tin plating) to improve corrosion resistance and finish.

Key process parameters

Melting temperature: 1200-1300℃ to ensure alloy uniformity.

Annealing temperature: 650-750℃ to balance plasticity and strength.

Hot working temperature: 700-900℃ to avoid grain coarsening.

Cold rolling deformation rate: controlled at 30-70% to optimize the work hardening effect.

2. Production process of C71500 copper strip

Core process

Melting and continuous casting: horizontal continuous casting or upward continuous casting, temperature 1100-1250℃, charcoal covering to prevent oxidation, continuous drawing to form strip.

Rolling processing:

Hot rolling: heat the strip to 700-900℃, roll to 4mm thick, and cool in coils.

Cold rolling: Rough rolling (to 1.5mm), intermediate rolling (to 0.7mm), finishing rolling (to 0.2-0.8mm), with annealing (550-650℃) in between to restore plasticity.

Surface treatment: Milling (remove 0.25-0.5mm on each side) to eliminate surface defects, pickling (dilute sulfuric acid) and passivation to improve cleanliness.

Shearing and coiling: Cut into finished products of different widths (50-500mm) and thicknesses (0.05-1.0mm) according to demand.

Process characteristics

Continuous production: Horizontal continuous casting and rolling are integrated to improve efficiency and reduce energy consumption.

Precision control: AGC (automatic thickness control) technology ensures a strip thickness tolerance of ±0.005mm.

Surface quality optimization: Bright annealing (nitrogen/hydrogen protection) to make the surface roughness ≤0.2μm.

3. Product performance indicators and advantages

Core performance of C71500 copper plate

Physical properties: density 8.94g/cm³, melting point 1170-1240℃, thermal conductivity 29W/(m·K), electrical conductivity 5-7% IACS.

Mechanical properties: tensile strength 415-550MPa, yield strength 105-280MPa, elongation 20-40%, hardness 80-150HB.

Corrosion resistance: corrosion rate ≤0.02mm/year in seawater and acidic media, outstanding anti-biological fouling performance.

Unique advantages of C71500 copper strip

Dimensional accuracy: thickness range 0.05-1.0mm, width 50-500mm, ultra-thin strips (0.05mm) can be customized.

Processing adaptability: 180° bending without cracks, suitable for precision forming such as stamping and bending.

Electrical properties: Resistivity 0.35µΩ·m, suitable for high-frequency signal transmission and electromagnetic shielding.