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.
CN108588367AInactive Publication Date: 2018-09-28荆州环宇汽车零部件有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
荆州环宇汽车零部件有限公司
Publication Date
2018-09-28
Estimated Expiration
Not applicable · inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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