aluminum alloy casting 1.Service life is 20 years 2.Surface spraying materials: ... .size:diameter is 200mm 1.This product use low pressure casting technology formation2.No stomata and density high3.Use 24 hours, life ... can reach 20 years4.This product by casting, machining, grinding, drilling, deburring, spraying, welding, inspectionetc, each step is ...