铸态铁素体硅钼球墨铸铁制备工艺的试验研究
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摘要
球化处理是球铁生产的重要环节之一,盖包法是针对冲入法存在的缺点进行改进而开发出来的一种球化处理方法。它的优点是减少镁光、粉尘等污染、提高镁的吸收率、能有效地提高球铁的综合性能等。
本试验根据江铃铸造厂的技术要求,采用盖包法球化处理工艺,分析论述了铸态铁素体硅钼球墨铸铁制备工艺中的技术重点及难点,选取化学成分、球化剂及孕育剂种类、孕育剂加入量、钼含量等参数进行试验研究,有针对性地调整及优化,寻求最佳的制备工艺参数,以稳定地生产出高性能铸态铁素体硅钼球墨铸铁。
试验采用中频感应电炉熔炼铁液,铁液主要化学成分范围控制在3.3-3.5C%,2.7-2.9Si%;采用快速热电偶测温,控制铁液的出炉温度。出炉时铁水温度尽量控制在1500-1550℃之间;以1530℃为佳。铁液由电炉熔化后倒入经过烘干的球化包中及提包内进行球化及孕育处理。将处理好的铁液浇注Y块,同时进行随流孕育。浇注成型后的试样经过60分钟左右开型,在空气中冷却到室温。
试验结果表明:本试验中,采用A球化及孕育剂处理,孕育剂的加入量为1.2%,强化孕育时,可以使球铁组织中碳化物含量显著降低,得到分布均匀、细小球状的石墨组织,球化率也稳定在85%以上,各项性能指标也达到要求。
Nodulizing treatment is one of the important links of production of ductile iron, Tundish-cover spheroidizing process is aims at Pour-over spheroidizing process that existence the shortcoming to carry on one sheroidizing method which the improvement develops. Its merit is reduces pollution and so on magnesium light, dust, enhances the absorptivity of Mg, can enhance the nodular cast iron effectively the overall performance and so on.
The present paper basis Jiangling Casting Factory specification, used Tundish-cover pour-over nodulizing process, the analysis elaborated in the technology key and the difficulty of fabrication of As-cast silicon and molybdenum ferrite ductile iron, the selection chemical composition, the type of nodularizer and inoculant, the join quantity of inoculant and the molybdenum and so on quantity conducts the experimental study, had the pointed adjustment and the optimization, sought the best preparation craft parameter, by stably produced the high performance casting condition ferrite silicon molybdenum modular cast iron.
The experiment use the intermediate frequency induction furnace melt iron-smelting fluid, the main chemical composition scope of iron-smelting fluid control in 3.3～3.5C%, 2.7～2.9Si%; Use the fast thermo-element to measure and control the temperature of the iron-smelting fluid. Pour the iron-smelting fluid when its temperature between 1500℃to 1550℃, 1530℃is more good. The iron-smelting fluid from the electric stove pours into the dried spheroidized package and the handbag carries on the spheroidizing and inoculanting process. Then the iron-smelting fluid pour Y, simultaneously carry on the following inoculantion. Takes the Y shape specimen after through 60 minutes, cools the room temperature in the air.
The result show that in the experiment, use the A spheroidization and inoculant, inoculant joins the quantity is 1.2%, when strengthened inoculation, may cause the carbide content remarkably to reduce which in the organization of ductile iron, obtains the distribution to be even and tiny nodular graphite organization, the spheroidization rating also stabilizes above 85%, each overall performance also achieve the requirements.
本试验根据江铃铸造厂的技术要求,采用盖包法球化处理工艺,分析论述了铸态铁素体硅钼球墨铸铁制备工艺中的技术重点及难点,选取化学成分、球化剂及孕育剂种类、孕育剂加入量、钼含量等参数进行试验研究,有针对性地调整及优化,寻求最佳的制备工艺参数,以稳定地生产出高性能铸态铁素体硅钼球墨铸铁。
试验采用中频感应电炉熔炼铁液,铁液主要化学成分范围控制在3.3-3.5C%,2.7-2.9Si%;采用快速热电偶测温,控制铁液的出炉温度。出炉时铁水温度尽量控制在1500-1550℃之间;以1530℃为佳。铁液由电炉熔化后倒入经过烘干的球化包中及提包内进行球化及孕育处理。将处理好的铁液浇注Y块,同时进行随流孕育。浇注成型后的试样经过60分钟左右开型,在空气中冷却到室温。
试验结果表明:本试验中,采用A球化及孕育剂处理,孕育剂的加入量为1.2%,强化孕育时,可以使球铁组织中碳化物含量显著降低,得到分布均匀、细小球状的石墨组织,球化率也稳定在85%以上,各项性能指标也达到要求。
Nodulizing treatment is one of the important links of production of ductile iron, Tundish-cover spheroidizing process is aims at Pour-over spheroidizing process that existence the shortcoming to carry on one sheroidizing method which the improvement develops. Its merit is reduces pollution and so on magnesium light, dust, enhances the absorptivity of Mg, can enhance the nodular cast iron effectively the overall performance and so on.
The present paper basis Jiangling Casting Factory specification, used Tundish-cover pour-over nodulizing process, the analysis elaborated in the technology key and the difficulty of fabrication of As-cast silicon and molybdenum ferrite ductile iron, the selection chemical composition, the type of nodularizer and inoculant, the join quantity of inoculant and the molybdenum and so on quantity conducts the experimental study, had the pointed adjustment and the optimization, sought the best preparation craft parameter, by stably produced the high performance casting condition ferrite silicon molybdenum modular cast iron.
The experiment use the intermediate frequency induction furnace melt iron-smelting fluid, the main chemical composition scope of iron-smelting fluid control in 3.3～3.5C%, 2.7～2.9Si%; Use the fast thermo-element to measure and control the temperature of the iron-smelting fluid. Pour the iron-smelting fluid when its temperature between 1500℃to 1550℃, 1530℃is more good. The iron-smelting fluid from the electric stove pours into the dried spheroidized package and the handbag carries on the spheroidizing and inoculanting process. Then the iron-smelting fluid pour Y, simultaneously carry on the following inoculantion. Takes the Y shape specimen after through 60 minutes, cools the room temperature in the air.
The result show that in the experiment, use the A spheroidization and inoculant, inoculant joins the quantity is 1.2%, when strengthened inoculation, may cause the carbide content remarkably to reduce which in the organization of ductile iron, obtains the distribution to be even and tiny nodular graphite organization, the spheroidization rating also stabilizes above 85%, each overall performance also achieve the requirements.
引文
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[8]铁道部戚墅堰车辆工艺研究所理化室,戚墅堰车辆工厂中央试验室.汉代铁镢的金相检查及其制造工艺[J].球铁,1979(1):16-18.
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[18]辜祖勋.球墨铸铁生产中若干问题的探讨[J].铸造,2003,52(9):709-712.
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