en.Wedoany.com Reported - On June 2, the State-owned Assets Supervision and Administration Commission of Shaanxi Province disclosed that the R&D Center of Shaanxi Nonferrous Yulin New Materials Group Co., Ltd. (referred to as "Yulin New Materials Group"), in collaboration with Central South University, has successfully completed a semi-continuous casting test for an 800 MPa grade 7xxx series ultra-high-strength aluminum alloy. They smoothly cast a high-quality aluminum alloy ingot with a diameter of 267 mm and an alloy element content exceeding 16%. This marks a significant breakthrough for Shaanxi Province in the independent R&D and engineering transformation of ultra-high-strength aluminum alloys. The 800 MPa grade 7xxx series ultra-high-strength aluminum alloy is a core foundational material for key fields such as aerospace, high-end equipment, and precision manufacturing, enabling the replacement of titanium with aluminum under certain extreme conditions.
Founded in 2009 and located in Jinjitan Town, Yuyang District, Yulin City, Shaanxi Province, Yulin New Materials Group is a subsidiary of Shaanxi Nonferrous Metals Holding Group Co., Ltd. With a total cumulative investment of 20 billion yuan and covering an area of over 5,000 mu, the group owns 4 subsidiaries and 6 branches. It operates a coal mine with an annual output of 10 million tons, an aluminum-magnesium alloy production capacity of 600,000 tons, a pre-baked anode capacity of 350,000 tons, supporting power facilities of 5×330MW, and a dedicated railway line with an annual transport capacity of 5.5 million tons. It is China's first enterprise to establish a complete coal-electricity-aluminum circular economy industrial chain. In 2025, the company produced 10.91 million tons of raw coal, 610,000 tons of electrolytic aluminum liquid, 300,000 tons of assembled anode blocks, and generated 10 billion kWh of electricity, successfully meeting its annual revenue targets. The group's R&D Center, established in 2020, features a 4,000-square-meter laboratory and a 2,000-square-meter pilot workshop, and has extensive collaborations with universities such as Central South University, Xi'an Jiaotong University, and Northwestern Polytechnical University in the field of aluminum alloys.
In this technological breakthrough, Central South University was responsible for designing the alloy composition system and optimizing element ratios, addressing performance defects caused by high alloying from the source. Central South University is a national key university directly under the Ministry of Education and is included in the national "Double First-Class" construction list. Its School of Materials Science and Engineering has deep research expertise in aluminum alloy materials. Previously, the university's research team developed a new high-strength aluminum alloy with a tensile strength of 773.7 MPa through thermomechanical processing. The R&D Center of Yulin New Materials Group handled the development of casting processes, strictly implementing high-standard procedures such as melting temperature control, online melt purification, and mold adjustment during the pilot phase, while tracking and optimizing key indicators like aluminum liquid fluidity and cooling rate in real time. Through collaborative efforts, the team successfully overcame the challenge of high-alloy casting formation.
In the next phase, the project team will carry out subsequent work including ingot homogenization treatment, hot working performance optimization, and mechanical property testing, accelerating the industrial application of the 800 MPa grade ultra-high-strength aluminum alloy to provide critical material support for aerospace and high-end manufacturing industries.
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