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Gongyi high-precision aluminium manufacturing

A battery-foil pinhole, can-stock earing deviation or automotive-sheet streak returns to charge, melt cleaning, casting route, rolling passes, anneal, flatness and slitting. High precision is not one grade but a use-defined window.

Formation and regional foundations

Gongyi combines dense plate-strip-foil producers, melting and rolling operations and downstream projects. Scale supports coordination, while alloy, recycled share, pinholes, flatness and forming results remain product- and lot-specific.

The Gongyi review retains evidence through charge, melt treatment, ingot or twin-roll casting, hot and cold rolling, anneal, levelling, surface inspection and slitting. Industry share shows scale; alloy, temper, dimensions and downstream forming carry suitability.

Core geography: The boundary covers evidenced Gongyi aluminium melting and casting, ingot or twin-roll casting, hot and cold rolling, annealing, levelling, slitting and precision plate, strip and foil for transport, packaging and batteries. Alumina, primary-aluminium trade, generic window profiles and other metals are excluded.

Precision aluminium chain from charge to coil release

Six casting, rolling and verification nodes

Alloy, temper and use jointly define precision.

  • Charge and melting — Primary, returns, recycled metal and alloy additions bind to heat.
  • Refining, degassing and filtration — Hydrogen, inclusions, temperature and filter condition set cleanliness.
  • Ingot or twin-roll casting — Route, grain, segregation and surface bind to cast.
  • Hot and cold rolling — Passes, reduction, heat, emulsion and roll surface form gauge and flatness.
  • Anneal, levelling and surface — Heat-time, tension and cleaning correspond to temper and surface.
  • Pinhole, dimensions and forming — Slit-coil identity links inspection, packing and trial forming.

01 · A pinhole is more than “rolled too thin”

Fix location, shape and coil segment first.

A battery-foil pinhole is mapped by edge distance, length position, repeat pitch and transmitted-light shape, then compared with slitter position, roll circumference and casting defects. Different periods point to different sources.

Can-stock earing deviation is read with texture, gauge, anneal and cup direction; automotive-sheet streaks may link to roll surface, emulsion or grain. One visual term cannot cover all three products.

Review fixes alloy, temper, mother coil, slit coil, line, shift and customer forming. A defect then returns to a coil segment, not merely to “Gongyi aluminium.”

02 · Charge structure must fit precision use

Recycled share is not a standalone green label.

Primary metal, internal returns, purchased scrap and alloy additions are accepted separately. Source, coating, oil and contaminants change melt loss, inclusions and trace-element control.

High recycled content has resource value but does not automatically qualify battery foil, can stock or auto sheet. Each use still proves impurity window, melt treatment and forming.

Charge weights, sequence, melt temperature and sample point enter the heat record. Furnace cleaning and transition metal have destinations so one alloy does not contaminate the next coil.

03 · Melt cleanliness sets the defect floor for thin material

Degassing, filtration and residence work together.

Fluxing, rotary degassing, filtration and settling control hydrogen and inclusions, yet each can add variation. Equipment condition, consumable lot and pressure drop are recorded.

Passing chemistry does not mean clean melt. Pinhole, edge crack or line defects may come from gas, oxide film and inclusions, requiring melt samples, online monitoring and defect location to correspond.

Stirring and sampling timing after alloy additions affect representativeness. One final spectrum sheet cannot explain furnace segregation or transfer variation.

04 · Ingot and twin-roll casting are different routes

Route follows gauge, alloy and structure.

Ingot route adds homogenisation, scalping and hot rolling for certain alloys and controls; twin-roll casting combines solidification and deformation, shortening flow but increasing sensitivity.

Casting speed, cooling, level and grain refining set segregation, grain and surface. A cast defect stretched by rolling can become a long streak or periodic pinholes.

Scalping depth, homogenisation and head-tail disposition retain lot links. Mixing unstable ends into normal coil can let downstream sampling miss a risk segment.

05 · Rolls, emulsion and passes form flatness

Average gauge cannot see local waves.

Hot rolling controls finish temperature, flatness and surface; cold rolling controls reduction, tension, speed and lubrication. Interstand gauge and tension synchronise with mother-coil position.

Roll wear, thermal crown, grinding marks and debris can print onto strip. Periodic surface defects compare pitch with work- and backup-roll circumference before blaming feedstock.

Emulsion concentration, temperature, filtration and biological condition affect lubrication and surface. Fluid changes, stops and cleanup after strip breaks enter event records.

06 · Anneal and finishing hand temper to the customer

Read strength, elongation and formability together.

Anneal temperature, dwell, ramps and furnace position govern recovery, recrystallisation and precipitation. The same alloy in a different temper can face entirely different forming or foil-rolling needs.

Tension levelling improves flatness, but excess elongation changes properties and edge condition. Flatness, residual stress, gauge variation and surface are checked in customer unwind direction.

Slitter clearance, overlap, tension and winding govern burr, telescoping and collapse. A passing mother coil does not qualify every slit coil; each inherits mother and knife position.

07 · Battery, packaging and automotive each have a window

“High end” cannot replace acceptance conditions.

Battery foil combines gauge uniformity, pinholes, cleanliness, burr and coating; each current-collector format also matches customer equipment and electrochemistry.

Can body and end stock emphasise strength, earing, surface, gauge and forming stability. Market share is a regional or product statistic, not a substitute for cup tests and customer-line trials.

Automotive sheet also faces stamping, joining, painting, corrosion and crash design. Project reports show direction; vehicle and series supply require customer approval evidence.

08 · Three legal entities carry different samples

Capacity, project and product are not borrowed.

Henan Mingtai samples plate, strip, foil and recycled flat-rolled material. Recycled-aluminium capacity describes feed and melting capability, not actual precision flat-product output.

Henan Zhongfu High Precision Aluminum samples precision strip and packaging material. Disclosures of Henan Zhongfu Industry and Yulian Group are separated by legal entity and site.

Henan Wanda samples 1xxx–8xxx plate, strip and foil and hot-cold rolling and finishing. Its 600,000-tonne annual processing capability is not saleable output for every alloy or use.

Sources and reading notes

Gongyi government, MIIT list and site reporting verify cluster, projects and production. Design capacity, recycled-aluminium capability and plate-strip-foil output remain separate; regional share is not assigned to one firm.

  • Gongyi had more than 100 above-scale aluminium processors in 2022.
  • Plate-strip-foil output was nearly 30% of the national total in the same period.
  • The same output represented 57% of Henan’s total.
  • Wanda reports annual processing capacity of 600,000 tonnes.

Related companies

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Sources

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