en.Wedoany.com Reported - Recently, China's Henan Steel Group achieved a technological breakthrough in the continuous casting of high-manganese non-magnetic steel. Using a 3250mm wide thin-arc caster, it successfully completed the stable continuous casting of the 20Mn23AlV product. The width-to-thickness ratio exceeded 13, and the rolling of multiple specification steel plates was successfully completed in one go, filling a technological gap in the domestic production of this steel grade via wide slab continuous casting. Continuous cast high-manganese non-magnetic steel is a demonstrative material listed in the "First Batch Application Demonstration Guidance Catalogue for Key New Materials (2024 Edition)" issued by the Ministry of Industry and Information Technology, and is a key core material in the power equipment sector.
Continuous cast high-manganese non-magnetic steel features ultra-low magnetic permeability, high strength, high toughness, and excellent processing performance. It can effectively reduce magnetic flux leakage losses in power equipment, significantly improving power operation efficiency and safety stability. It is widely used in the manufacturing of high-end power equipment such as magnetic shielding for large transformers and non-magnetic structural components for generators, as well as in power transformers, precision electronic instruments, and the aerospace field. Continuous cast high-manganese non-magnetic steel has high manganese and aluminum content, making production control difficult and prone to quality defects such as casting slab cracks and component segregation. The technical barriers across the entire process of smelting, continuous casting, and rolling are prominent. The wide thin slab continuous casting process requires high compatibility between equipment and process, and previously there was no successful precedent for industrial production using wide slab continuous casting in China.
The technical team of Henan Steel Group formed a special task force to carry out systematic technical research on continuous cast high-manganese non-magnetic steel. During the casting process, the team optimized various key process parameters, overcame technical bottlenecks such as continuous casting mold flux and cooling regimes, and solved multiple common industry challenges for this steel grade, including fluctuations in the continuous casting process and low casting slab qualification rates. The quality of the continuous cast high-manganese non-magnetic steel slabs was improved, facilitating the successful implementation of direct hot charging for this steel grade. It was successfully rolled in one pass on a heavy plate rolling mill, significantly boosting production efficiency. Currently, the first batch of continuous cast high-manganese non-magnetic steel 20Mn23AlV products has been successfully delivered, with surface quality and all performance indicators meeting customer requirements.
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