Metals, alloys, oxides, nitrides, carbides, powder materials and products, 3D printing materials, new materials, research, development, manufacturing and sales of welding materials; Technical consultation, technology transfer and technical services of new materials; Import and export of goods or technologies (except for goods and technologies prohibited by the state or involving administrative approval). (Projects that require approval according to the law can only carry out business activities after being approved by relevant departments. ) (Projects that require approval according to the law can only carry out business activities after being approved by relevant departments. )