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某厂为国外一公司生产小批量多品种中小铸件,该公司要求б_b≥20.4kg/mm~2,厚薄悬殊断面的硬度控制在173～255HB之间。该厂生产这批铸件的实际硬度在158～449HB范围内波动。在分析铸件硬度超差原因和查阅国内外资料的基础上,对添加剂的种类和数量,对铸件的化学成分、组织和性能进行了比较系统的试验研究,确定了原铁水的化学成分及其添加剂的品种和数量。试验结果表明,消除了不同断面硬度的严重超差,完全控制在所要求的范围之内。
A factory for a foreign company producing small quantities of small and medium variety of small and medium-sized castings, the company requires б_b ≧ 20.4kg / mm ~ 2, the hardness of the thickness of the critical section control between 173 ~ 255HB. The actual hardness of the castings produced by this factory fluctuates in the range of 158 ~ 449HB. Based on the analysis of the causes of over-hardness of castings and the consulting of domestic and foreign materials, the types and quantities of additives, the chemical composition, microstructure and properties of the castings were systematically studied. The chemical composition and additives Variety and quantity. Test results show that the elimination of the hardness of different sections of a serious over tolerance, the total control within the required range.