我厂两座炼铁和两座炼化肥的高炉风渣口铜套都是用紫铜铸造的,铸件的内、外部壁厚δ=8mm。这些铸件的工艺复杂,浇注的技术要求高。铸件的质量用15MPa水压检验,因此在生产中稍有微小问题,都会引起产品报废,一般这些铸件的合格率为65％～70％。铸件报废的主要原因是应力裂纹,另外加上铸件材质局部组织疏松,用水试压时出现渗漏。 Two iron smelters in our factory and two blast furnace slag slag copper sockets are all made of red copper. The inner and outer wall thicknesses of the castings are δ = 8mm. The casting process complexity, high technical requirements pouring. The quality of castings with 15MPa water pressure test, so slightly minor problems in production, will cause product scrap, the general pass rate of these castings is 65% to 70%. Casting scrap the main reason is the stress cracks, coupled with the castings of local material loose, water leakage occurs when the pressure test.