Production technology of high-phosphorus iron casting

A production process and iron casting technology, which is applied in the production process field of low-alloy gray iron castings, can solve the problems of high production cost and poor mechanical properties of high-phosphorus cast iron, and achieve the effect of avoiding cold cracking

Active Publication Date: 2011-10-19
江西德辰科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a new production process of high-phosphorus cast iron to solve the technical problems of poor

Method used

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  • Production technology of high-phosphorus iron casting
  • Production technology of high-phosphorus iron casting

Examples

Experimental program
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Example Embodiment

[0028] In order to adapt to the development of machine tool casting materials towards high strength and high rigidity, and to further improve the wear resistance and use performance of the machine tool, while taking into account the cost of local raw materials, the basic process idea is to adopt a production method close to synthetic cast iron, namely Significantly increase the proportion of scrap steel and reduce the proportion of pig iron. The pig iron here is 18# ordinary pig iron.

[0029] Table 1 below is a specific example comparison between the composition ratio of the charge of the present invention and the traditional scheme.

[0030] Table 1

[0031] Charge

[0032] The raw material chemical composition of scrap steel and 18# ordinary pig iron added in the present invention is shown in Table 2 below.

[0033] Table 2

[0034] Chemical composition of raw materials

[0035] From Table 1, we can clearly see that the composition ratio of the charge has been greatly changed...

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Abstract

The invention provides a production technology of a high-phosphorus iron casting so as to solve the technical problems such as poor mechanical property, obvious cooling crack and high production cost of the high-phosphorus iron casting in the background technology. The production technology of the high-phosphorus iron casting includes the steps as follows: firstly, adding scrap steel and recarburizer into an induction intermediate frequency furnace; secondly, adding foundry returns; thirdly, adding pig iron; fourthly, adding ferrophosphorus, ferrosilicon and ferromanganese in sequence; fifthly, after 18-20min, raising the furnace temperature to 1480-1520 DEG C and conducting inoculation for multiple times by adopting Fe-Si and Si-Ba series; and sixthly, by a stream pouring inoculation way, finally obtaining the pearlite high-phosphorus iron casting with high strength under the condition of CE (carbon equivalent) higher or equal to 3.5%. The mechanical property and metallographic structure (graphite form, type A and pearlite) of the high-phosphorus iron casting prepared by the technology are both superior to the technique data of the product obtained under higher technology cost.

Description

technical field [0001] The invention relates to a production process of low-alloy gray iron castings, in particular to a production process of high-strength, high-rigidity and high-phosphorus iron castings. Background technique [0002] Among the machine tool guide rail castings, some are made of high phosphorus cast iron, which is a gray cast iron part with wear resistance requirements. The guide rail part works under sliding conditions and has contact fatigue wear. [0003] From the perspective of the matrix structure, the more pearlite in the matrix structure, the higher the hardness gradually, and the better the wear resistance. Tensile strength 300-350Mpa, pearlite quantity ≥ 90. [0004] According to the traditional charge composition and its specific process steps, the cost is relatively high, and in fact, the castings obtained by casting have different degrees of cold cracking, which also affects the strength and rigidity of the castings. Contents of the invention...

Claims

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Application Information

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IPC IPC(8): C22C33/08
Inventor 陆寅鹏
Owner 江西德辰科技有限公司
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