Inspection and testing services. General items: Railway rolling stock parts manufacturing; High-speed rail equipment and parts manufacturing; Industrial design services; Metal product research and development; New material technology research and development; Metal structure manufacturing; General parts manufacturing; Ferrous metal casting; Non-ferrous metal casting; Forging and powder metallurgy product manufacturing; Additive manufacturing; Steel rolling processing; Non-ferrous metal rolling processing; Metal cutting processing services; Mold manufacturing; Metal surface treatment and heat treatment processing; Goods import and export; Technology import and export; 3D printing services; Technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion.