Production process and product advantages of C21000 copper tube:

1. Production process

Raw material processing and smelting

C21000 brass is mainly composed of copper (94.0-96.0%) and zinc (balance). High-quality low-lead brass is used as raw material in production, which is melted in a smelting furnace and injected into a holding furnace and maintained at a preset temperature. Electromagnetic stirring technology is introduced in some processes to refine grains, reduce pores and cracks, and improve the uniformity of copper tube wall thickness.

Forming and processing

Continuous casting and rolling: horizontal continuous casting combined with planetary rolling technology is adopted. For example, Jiangxi Copper has introduced equipment from Japan's Mitsui and Germany's Junkers to achieve efficient production

After horizontal continuous casting, it is treated with water cooling (to 50°C), and then processed by milling, planetary rolling and other processes.

Stretching and annealing: High-speed tandem drawing machines and multi-wire stretching machines with independent technology are used, combined with the floating core head stretching process to ensure the smoothness and dimensional accuracy of the internal and external surfaces. The online annealing process (540-600℃) further optimizes the material properties.

Hot and cold processing: C21000 can be processed into pipes, plates, etc. through cold rolling and hot rolling (775-850℃) to meet different specifications.

Surface treatment and testing

A high-precision straightening machine is used to ensure straightness, and the surface is cleaned and then rewound for flaw detection. Combined with Swiss imported direct reading spectrometer and other equipment for precision testing, product stability and consistency are ensured.

2. Product advantages

Excellent mechanical properties

The tensile strength of C21000 copper tube is ≥205MPa, and the elongation δ10≥35%, δ5≥42%. It has both high strength and good ductility, and is suitable for high-load scenarios.

Corrosion resistance and durability

The five-layer anti-rust electroplating treatment significantly improves the anti-corrosion performance, especially for high salt spray environments such as marine industry. Its copper-zinc alloy characteristics are naturally corrosion-resistant and can be used stably for a long time.

Outstanding processing performance

Hot and cold processing: excellent cold processing performance, good hot processing performance, suitable for manufacturing precision parts such as rivets and screws.

Customization flexibility: supports customization of multiple specifications with outer diameter of 3-200mm and wall thickness of 0.4-65mm, suitable for air conditioners, heat exchangers and other scenarios.

Energy saving and environmental protection

The production process adopts variable frequency power regulation and energy automatic metering technology to reduce energy consumption; waste emulsion, copper chips and other scraps are recycled to meet environmental protection requirements. The material itself complies with EU environmental protection directives, such as SGS certification.

Wide application fields

Applicable to marine engineering (salt spray corrosion resistance), air conditioning and refrigeration (high thermal conductivity), power equipment (excellent conductivity) and machinery manufacturing (easy cutting processing) and other fields. It is particularly outstanding in scenarios such as heat exchangers and condensers.