Main camp: cast and sale of metal materials such as ball ink casts of iron wells, rain-fed plasters, ditch lids, manufacture and sale of metal products such as seamless steel pipes, alloy steel tubes, models, plates, etc.; sale of non-ferrous metal alloy materials; import and export of goods and technology at own and agency level. (in addition to projects subject to authorization under the law, the operation of the business is carried out autonomously under a licence)