．Alloy Aluminum Gravity Casting

　　Due to the considerations in professional aspects, we do not encourage clients to use gravity casting with sand mold due to cost or other facts. The metallurgy structures and mechanical features of metal mold for gravity casting are unreachable by the gravity casting with sand mold.

　　After the gravity casting with AC4B or AC8A aluminum alloys, we will undertake T6 heat treatment in order to make the metal crystals more effectively form optimal balance states, so that they can meet the requirements on cylinder or cylinder sleeve.



Design Specification on AC4B：
tensile strength：>240N/mm² (>25kg/mm²)
hardness：HB100~115 (HRB60~70)

Design Specification on AC8A：
tensile strength：>270N/mm² (>28kg/mm²)
hardness：HB110~135 (HRB65~75)

 We provide the chemical compositions used on various casting methods for alloy aluminum cylinder for reference as following。