Metal materials belonging to metallurgical products, engaged in the production of metal materials, ordering, transportation, use, storage and inspection must be based on a unified technical standards - metallurgical product standards. Personnel engaged in metal materials must master the relevant content of the standard. http://www.gold-testing-machine.com/product/gold-testing-machine-gt-05/ China's metallurgical products use the standard for the national standard (code-named "GB" GB "), the Ministry of the Ministry of Metallurgical Industry Standard" YB ", a machine department standard" JB ", enterprise standard three. (A) packaging inspection according to the type of metal materials, shape, size, accuracy, corrosion may be. 1 . Bulk: no packaging, wiping, block (not afraid of corrosion, not expensive), large steel (large steel, thick steel, rail), pig iron and so on. 2 . Bundle: refers to the smaller size, corrosion has little effect on the use,