Description
1. Material: pure copper (T1, T2, copper content of 99.9% or more, excellent electrical/thermal conductivity, for electrical appliances, precision parts); brass (H62, H65, copper-zinc alloy, easy to process, high strength, for hardware, stamping parts); bronze (QSn6.5-0.1 tin-bronze, abrasion and corrosion-resistant, used in machinery, wear-resistant parts; QAl9-4 aluminium-bronze, high-strength, used in industrial structures); white copper (B19, B30, copper-nickel alloy, weather-resistant, for instruments, marine equipment). ); white copper (B19, B30, copper-nickel alloy, weather resistance, for instrumentation, marine equipment).
2. Standard: GB/T 2040 (pure copper rolls), GB/T 5231 (brass rolls), GB/T 2059 (bronze rolls, white copper rolls); international standard ISO 1652, American Standard ASTM B152, Japanese Standard JIS H3100.
3. Size: Thickness 0.05-3mm (0.05-0.1mm for ultra-thin rolls, 0.1-1mm for regular rolls, 1-3mm for thick rolls); Width 100-1250mm; Diameter of the rolls (Inner Diameter) 50-150mm, (Outer Diameter) 200-800mm, Length on request (dozens of metres to hundreds of metres).
4. Processing technology: copper ingot melting → casting into billets → hot rolling (initial thickening) → cold rolling (multi-channel rolling, control the thickness of precision) → continuous annealing (elimination of processing stress, adjusting the hardness) → surface treatment (pickling to remove oxidation, polishing and brightening, passivation corrosion prevention) → slitting (according to the width of the demand for cutting) → winding (made of coils) → inspection (composition, thickness, surface quality testing).
5. Applicable industries: electronic and electrical appliances (connector shrapnel, circuit board substrate, pure copper rolls / T2 brass rolls); hardware stamping (precision gaskets, fasteners, H62 brass rolls); machinery manufacturing (wear-resistant gaskets, seals, QSn6.5-0.1 bronze rolls); instrumentation (dials, sensor shells, B19 copper rolls); architectural decorations (ultra-thin decorative panels, signage, coloured / polished copper rolls); automotive industry (small, brightening and anti-corrosion); building decoration (ultra-thin decorative panels, signage, colouring / polishing). copper coils); automotive industry (small conductive parts, stamping accessories, high-precision brass coils).
