Abstract: This paper systematically demonstrates the necessity and feasibility of phasing out conventional grain⁃oriented silicon steel (CGO) during the "15th Five⁃Year Plan" period from the perspective of high⁃quality development of China's silicon steel industry. The article first reviews the technical evolution of CGO silicon steel from Goss's invention in 1933 to the present, pointing out that the copper⁃containing medium⁃temperature QRD process currently widely adopted in China represents backward production capacity in terms of magnetic properties, resource utilization, energy consumption, and production organization. The paper elaborates on the legal basis for eliminating CGO from five dimensions: first, CGO uses Cu2S as an inhibitor, leading to copper resource waste and scrap steel recycling difficulties; second, the medium⁃temperature heating process has high energy consumption and low yield rates; third, product magnetic properties fail to meet the GB 20052⁃2024 new energy efficiency standards and the demands of high⁃end fields such as ultra⁃high voltage and new energy; fourth, equipment standards lag behind smart manufacturing requirements; and fifth, disorderly capacity expansion triggers market "involution" and vicious competition. The article further analyzes the practical significance of phasing out CGO for supporting ultra⁃high voltage construction, serving emerging fields such as national defense, military industry, and low⁃altitude economy, and promoting industrial technology upgrading. Four policy recommendations are proposed: explicitly prohibiting CGO hot⁃rolled coil production through national industrial policies; promoting equipment upgrading and transformation of cold⁃rolling enterprises; optimizing the standard system to raise industry thresholds; and strengthening the supporting role of standards and quality.

Key words: grain?oriented silicon steel, CGO, phase?out, energy efficiency