Precision casting enterprises mainly from the purchase of metal materials, materials, corporate waste castings, pouring riser. The outsourcing of metal materials are often in bulk, and rarely pressed into a tube-like, different materials are easily confused with the material, such as 316 material mixed with 304 or 430 materials. Therefore, the precision casting enterprises to purchase as much as possible to suppress the cylinder into the material. The chemical composition of each batch of purchased material was analyzed by a spectral analyzer. Where possible, site visits to suppliers should be conducted to assess whether materials are identified, protected and stored in isolation.
The enterprises of scrap (waste castings, pouring riser) to be in addition to corrosion, to oil, sand and clean and dry treatment, control S, P components. And, for different materials to be marked scrap, protection, storage separation, can not be confused.
