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Normalizing process method for obtaining QT450-12 material

A process method and material technology, which is applied in the field of normalizing process to obtain QT450-12 material, can solve the problems of slow cooling speed of castings, reduced gas permeability of molding sand, slow cooling speed of large parts, etc.

Inactive Publication Date: 2018-09-28
荆州环宇汽车零部件有限公司
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Problems solved by technology

Due to the relatively thick sand layer, the resin, curing agent and coating all increase the gas generation of the molding sand and reduce the gas permeability of the molding sand, so the cooling speed of the casting is very slow, and the cooling speed of the large part is even slower, and it is easy to get the QT400-18 material casting; and we need The material QT450-12 is not easy to get

Method used

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  • Normalizing process method for obtaining QT450-12 material
  • Normalizing process method for obtaining QT450-12 material

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Embodiment Construction

[0013] In order to make the technical means, creative features, goals and functions achieved by the present invention clearer and easier to understand, the present invention will be further elaborated below in conjunction with the accompanying drawings and specific implementation methods: a normalizing process method for obtaining QT450-12 material, casting The state is a mixed structure with ferrite as the matrix, its silicon content is 2.4%-2.8%, and its manganese content is ≤0.45%. After incomplete austenitization at 810°C-830°C, normalizing for 1.5 hours and air cooling; Get the proper pearlite content and QT450-12 material.

[0014] As a specific example, a mixed structure with a silicon content of 2.4%-2.8% and a manganese content of ≤0.45% is obtained through casting sampling. The casting must be uniform in texture, free of cracks and defects that affect product performance; on the processing surface of the casting, processing is allowed. Sand hole, air hole, slag hole ...

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Abstract

The invention provides a normalizing process method for obtaining a QT450-12 material. The normalizing process method for obtaining the QT450-12 material is characterized in that an as-cast structureis a mixed structure taking ferrite as a matrix, the silicon content of the mixed structure is 2.4%-2.8%, and the content of manganese of the mixed structure is less than or equal to 0.45%; non-complete austenization is carried out on the mixed structure at the temperature of 810 DEG C- 830 DEG C, normalization is carried out, heat preservation is carried out for 1.5 hours, and air cooling is carried out; and a proper pearlite content and the QT450-12 material are obtained. The normalizing process method can solve the problem that a resin sand model casting cannot meet the requirements of theperformance of the QT450-12 material, and is successfully applied to the production of products such as valve plates and valve bonnets which are made of the same material.

Description

technical field [0001] The invention relates to the field of normalizing technology, in particular to a normalizing method for obtaining QT450-12 material. Background technique [0002] Resin sand casting is to add a certain proportion of furan resin and curing agent to the original sand (scrubbing sand: winter sand temperature ≤ 20 ℃, summer sand temperature ≤ 40 ℃), and immediately stir evenly, and then cover the prepared sand with sand On the mold of the box, pound the molding sand, place it at room temperature for about 30 minutes to solidify, then demould, paint, close the box, and place it for more than 4 hours before pouring. Due to the relatively thick sand layer, the resin, curing agent and coating all increase the gas generation of the molding sand and reduce the gas permeability of the molding sand, so the cooling speed of the casting is very slow, and the cooling speed of the large part is even slower, and it is easy to get the QT400-18 material casting; and we n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D5/00C21D1/28
CPCC21D5/00C21D1/28
Inventor 朱志华
Owner 荆州环宇汽车零部件有限公司
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