China’s aerospace aluminium industry is at a crossroads. The demand has never been stronger. The technology has never been closer. But the gap between what China can produce and what its aerospace programmes actually need remains wider than most people realise.
I have spent 25 years working with aluminium melting furnaces in China. In the last five years, I have watched aerospace melting shift from a niche specialty to a national priority. The numbers tell a story of ambition. The shop floor tells a story of struggle.
Here is what the data actually says — and what it means for foundries, equipment buyers, and anyone supplying into this supply chain.
The Central Contradiction: Low-End Excess, High-End Shortage
China’s aluminium processing industry runs at an average capacity utilisation rate of just 78%. In aerospace and other critical high-end sectors, domestic self-sufficiency for high-end aluminium materials is below 65% (source: China Nonferrous Metals News, 2026).
The contradiction is stark. China has enormous aluminium capacity. But the specific grades, quality levels, and consistency that aerospace demands are still largely imported.
The numbers on high-precision aluminium ingots make this concrete. By mid-2026, China’s nominal capacity for high-end aluminium ingots exceeded 4.5 million tonnes per year. Actual effective output was only about 2.85 million tonnes, giving a capacity utilisation rate of 63.3% — down 2.4 percentage points from the same period in 2025 (source: China Nonferrous Metals Industry Association, Q2 2026).
Meanwhile, import dependency for the most critical grades remains high:
| Product Category | Import Dependency |
|---|---|
| Aerospace 7xxx ultra-hard aluminium | 41.8% (overall high-end) |
| Aerospace-grade Al-Li alloy plate | 68.5% |
| 6N-grade high-purity aluminium for semiconductor targets | High |
The price gap tells the same story. Domestic high-end aluminium processing profit margins have been compressed to below 1,200 yuan per tonne. Imported high-end aluminium ingot commands a premium of 8,000 to 12,000 yuan per tonne (source: China Customs and SMM data, 2026).
That is not a small gap. It is a chasm.
Why the Gap Exists: Melting Is the First Bottleneck
The bottleneck is not rolling. It is not forging. It is melting.
Aerospace-grade aluminium requires extreme purity, tight chemistry control, and consistent microstructure. Commercial aerospace operating conditions are extreme — the material must withstand high stress, fatigue, and temperature extremes. Any deviation in the melting and casting process — even a small one — can produce cracks, inclusions, or gas porosity that fail inspection.
“The first obstacle to producing aerospace-grade aluminium is melting,” said Liu Fangzhen, a technical centre engineer at China Hongqiao Group’s aluminium processing division. “The requirements for hardness, toughness, and purity are extremely strict. A slight deviation in the melting and casting stage can easily produce cracks and inclusions.”
China Hongqiao’s experience is instructive. When developing 7xxx-series aerospace extrusion profiles, the company had to redesign its zinc-magnesium ratio and adjust manganese and chromium content. They optimised melting temperature, charging sequence, holding schedule, melt purification, inline degassing, filtration method, and casting parameters — all to improve element distribution uniformity and melt cleanliness.
The yield rate at the start of production was 15–20%. That is, for every 100 tonnes of material processed, only 15 to 20 tonnes of finished product emerged. After extensive process optimisation, the yield improved to 70–80%, compared with an industry average of 55–60% for general industrial profiles.
That is the reality of aerospace melting. It is not a matter of buying a better furnace. It is a matter of controlling every variable in the process.
The 7050 Story: How China Broke the Import Lock
The most telling case study is the development of 7050 aluminium alloy for the C919.
7050 is the third-generation advanced aluminium alloy used in aircraft wing beams, ribs, fuselage frames, and skin panels. It was previously considered “one of the hardest aluminium alloys to cast.” China could not produce it. Imported material cost over 100,000 yuan per tonne and was often subject to export restrictions.
Southwest Aluminium (西南铝) began working on 7050 in 2005. The team had no previous experience with this alloy. They started from zero.
The first problem was casting cracks. Because the alloy requires high strength, the ingot is prone to cracking during solidification. Project team members stayed by the furnace 24 hours a day, waiting for each melt to finish. At one point, the foundry had accumulated over 1,000 tonnes of cracked ingots, representing losses exceeding 10 million yuan-4.
It took over 100 failed attempts before the first successful ingot was produced in December 2005. Even then, the battle was not over. When the team moved to thicker plates — 100mm, 120mm, 150mm — the fatigue performance and through-thickness tensile properties repeatedly failed to meet specification.
Today, Southwest Aluminium supplies over 50% of the aluminium materials used in the C919, covering 30 specifications and more than 600 components.
That is the cost of entry into aerospace melting. It is measured in years, not months.
The Electrification of Aerospace Melting
One of the most significant technical shifts in China’s aerospace melting industry is the move toward electric and vacuum-based melting technologies.
For Al-Li alloys (aluminium-lithium), traditional melting methods are problematic. Lithium is highly reactive. In conventional melting, it absorbs hydrogen and forms slag. Zhengzhou Light Alloy Research Institute developed a full vacuum melting and casting process for the 5A90 Al-Li alloy, which solved the hydrogen absorption and slag formation problems, and eliminated Cu and Mg segregation. The result is high-purity Al-Li ingots suitable for missile cabins, fuselage frames, and aircraft skin panels.
For high-purity aluminium, China has also made significant breakthroughs. Guangxi’s Guangtou High-Purity New Materials company achieved 99.999% (5N-grade) purity using a physical purification method that emits zero pollution and uses 90% less energy than conventional electrolytic methods. Production reaches 5N-grade within 12 hours. The product now supplies aerospace and semiconductor customers directly.
These breakthroughs matter because aerospace melting is not just about making aluminium hot. It is about controlling what happens to the metal at the molecular level.
Digitalisation: The Next Frontier
The most forward-looking trend in aerospace melting is digitalisation. I recently spoke with a forging plant chief engineer who had just returned from a research institute in Germany. He described a melting workshop where the lights were off — not to save power, but because the entire process from charging to ingot output was fully automated. Robotic arms and data streams, no human operators.
He said it felt like a “generation gap” — while Chinese foundries are still trying to pass down experience from master craftsmen, the Germans have moved to a stage where there is “no master to pass down.”
This is the direction China is heading, but the gap remains. The core of “lights-off production” is replacing end-of-line quality inspection with process quality assurance:
Digital twin and predictive control: Building high-fidelity physical and chemical models for each furnace and each melt. Simulating thousands of virtual melts before actual production to find the optimal process window and predict defect types. During production, sensor data is compared in real time with the digital twin for dynamic correction.
Online non-destructive testing: Using ultrasonic testing of the melt, surface visual analysis, and thermal imaging during casting to judge internal quality and surface condition in real time — before the metal solidifies.
Full traceability: The quality report of the future is a continuous stream of process data, not a few isolated inspection certificates.
These technologies are being developed and applied in China’s leading aerospace melting facilities. But they are not yet standard across the industry. The gap between the top-tier producers and the rest is enormous.
Policy Support and the Road Ahead
The Chinese government has made aerospace aluminium a strategic priority. The Aluminium Industry High-Quality Development Implementation Plan (2025–2027) , issued by ten ministries, explicitly calls for breaking through key technologies in aerospace-grade aluminium and ensuring supply chain security.
The policy framework has three pillars:
Domestic substitution: Reducing import dependency for critical aerospace materials from 41.8% toward self-sufficiency.
Green transition: Applying low-carbon melting technologies to meet carbon border adjustment pressures.
Digital upgrading: Promoting intelligent manufacturing and full-process quality traceability.
Capital markets are responding. Jiangsu Haoran New Materials is building an aerospace aluminium alloy industrial park with investment exceeding 1 billion yuan, with a construction period of 2026–2027. The project covers 60+ product categories across automotive, new energy, aerospace, drones, and humanoid robots.
What This Means for Equipment Buyers
If you are buying a melting furnace for aerospace-grade aluminium production, the requirements are fundamentally different from general foundry applications.
The key considerations:
Vacuum capability: For Al-Li and other reactive alloys, vacuum melting is not optional. It is mandatory.
Atmosphere control: Oxygen and moisture must be controlled to parts-per-million levels. This requires airtight furnace design and gas purification systems.
Temperature uniformity: Aerospace alloys require ±3°C or better. Standard furnaces deliver ±10–15°C.
Melt cleanliness: Inline degassing, filtration, and ceramic foam filters are standard. The furnace must be designed for these.
Process traceability: Every melt must be documented. The furnace control system must log temperature, atmosphere, holding time, and chemistry data.
Certification support: The furnace supplier must understand AMS 2770, NADCAP, and Chinese aerospace standards (GJB). They must support your certification process.
These requirements do not come cheap. But for aerospace work, the cost of failure is far higher.
A Real Case from Southwest China
In 2024, I visited a foundry in Sichuan that had just commissioned a new vacuum melting furnace for aerospace-grade Al-Li alloy. They had previously imported all their Al-Li ingots from Europe.
The furnace was designed by a Chinese manufacturer, built to the foundry’s specification. The vacuum system maintained 10⁻³ Torr during melting. The gas purification system used five-stage argon cleaning.
The first three months were difficult. The yield rate was 30%. The team had to relearn everything — from charge preparation to casting speed to mould design.
By month six, the yield rate reached 65%. By month twelve, it was 78%. They are now producing Al-Li ingots that meet aerospace specification, at 40% below the imported price.
That is the trajectory of China’s aerospace melting industry. It is not a straight line. It is a series of hard-won battles.
Final Thoughts
China’s aerospace aluminium melting industry is not yet self-sufficient. The import dependency figures — 41.8% overall, 68.5% for Al-Li plate — tell you that.
But the direction is clear. The 7050 story showed it is possible. The Al-Li vacuum melting breakthrough showed it is achievable. The digitalisation trend shows where the next frontier lies.
In my 25 years, I have seen China move from importing almost everything to producing over half the aluminium in its own commercial aircraft. That is not a small achievement. But the gap between what China can do and what it needs to do remains the defining challenge of the next decade.
For equipment buyers and foundry operators, the message is simple: aerospace melting is a different game. It demands different furnaces, different processes, and different standards. The suppliers who understand this will win. The ones who do not will be left behind.
Internal links: The State of the Aluminium Recycling Industry in China – Expert Analysis, How Chinese Furnace Manufacturers Are Competing in Global Markets
About the Author: Hu Shenyue is a veteran aluminium melting furnace expert with 25 years of hands-on experience in China, Southeast Asia, India, the UK, and Europe. He writes practical, experience-based content on furnace selection, maintenance, and optimisation at SmeltPro.
