Method for performing heat treatment on nodular iron casting in nodular cast iron production
A technology for ductile iron and cast iron, which is applied in the field of heat treatment of ductile iron, can solve the problems of unsatisfactory heat treatment effect and poor low-temperature impact capability of ductile iron, and achieve the effects of improving machinability, realizing mass production, and enhancing low-temperature impact capability.
Inactive Publication Date: 2015-06-24
山西清慧机械制造有限公司
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[0005] The invention provides a method for heat treatment of ductile iron castings in the production of ductile iron, aiming to solve the problem of unsatisfactory heat treatment effect on ductile iron castings in the prior art and poor low-temperature impact ability of ductile iron in the production of ductile iron
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[0018] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the invention.
[0019] figure 1 It is the implementation process of the method for heat treatment of spheroidized molten iron in the production of nodular cast iron provided by the embodiment of the present invention.
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The invention discloses a method for performing heat treatment on a nodular iron casting in a nodular cast iron production. The method comprises the following steps: performing metallography detection on the nodular iron casting, judging the nodulizing grade and the matrix structure, and determining the high-temperature graphitization annealing process according to the matrix structure; loading the casting into a furnace, heating the casting to the temperature of 890-910 DEG C and keeping the temperature for 2-4h; cooling in the furnace to 740-760 DEG C and keeping the temperature for 1-3h; cooling in the furnace to the temperature of 600-630 DEG C, discharging the nodular iron casting, and performing air cooling to room temperature to finish the nodular iron casting heat treatment. By adopting the method for performing heat treatment on the nodular iron casting in the nodular cast iron production, the grain crystal is refined, the carbide generated in the freezing cold part is eliminated, the low-temperature impact of the nodular iron casting is reinforced, the hardness is reduced, the machinability is improved, various performances of the low-temperature nodular cast iron can be reached by the material, various property indices are obtained by a stable process, the volume production is realized and the cost is reduced.
Description
technical field [0001] The invention belongs to the technical field of ductile iron production, and in particular relates to a method for heat treating ductile iron castings in ductile iron production. Background technique [0002] Ductile iron with low temperature impact requires good impact performance at low temperature, and its internal quality requirements are very high. How to obtain its various performance requirements and stable production is a difficult point in material production. [0003] Impact toughness reflects the energy absorbed by the material when it breaks, and also reflects the ability of the material to resist crack initiation, development and fracture under rapid deformation conditions. Low-temperature impact toughness is a material toughness index, that is to say, ductile iron castings with high low-temperature impact toughness have high impact toughness at -50°C, and the brittle-toughness transition temperature is low, which can better overcome cold ...
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Inventor 张永军
Owner 山西清慧机械制造有限公司
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