Method for computing accurate value of carbon equivalent of cast iron and application of method

A calculation method and carbon equivalent technology, applied in the field of cast iron alloys, can solve problems such as failure to consider the content and role of trace elements, inability to accurately control carbon equivalent, increase in shrinkage defects in castings, etc. Reducing the effect of internal shrinkage

Inactive Publication Date: 2012-12-05
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hereditary influence of these trace elements in the casting process makes it impossible to accurately control the carbon equivalent when batching, resulting in large fluctuations in quality
[0003] In general, the calculation of carbon equivalent in the casting production process only consider

Method used

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  • Method for computing accurate value of carbon equivalent of cast iron and application of method
  • Method for computing accurate value of carbon equivalent of cast iron and application of method
  • Method for computing accurate value of carbon equivalent of cast iron and application of method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Table 2 Spectrometer test results of Examples 1~3

[0017]

Example Embodiment

[0018] Example 1

[0019] In this embodiment, the method is as follows:

[0020] a) According to the charge ratio: 30% pig iron, 18% scrap steel, 52% reheated iron, molten iron is smelted by an induction electric furnace, and the mass fraction of carbon in the molten iron w(C) and the mass fraction of silicon w(Si ), the mass fraction of all elements except iron in the molten iron w(M) i , W(M) involved in this embodiment i Including w(C), w(Si), w(Mn), w(P), w(S), w(Cu), w(Sn), w(Cr), w(V) and w(Mo) , The test results are shown in Table 2;

[0021] b) Establish a carbon equivalent formula Among them, q is the graphitization tendency index of elements, 0 is used for promoting graphitization elements, and 1 is used for hindering graphitization elements; n is the number of elements, k is the graphitization degree coefficient of elements in molten iron; q, n, and elements in molten iron The k value is shown in Table 1. The q, n, k values ​​and the mass fraction of each element measur...

Example Embodiment

[0027] Example 2

[0028] In this embodiment, the method is as follows:

[0029] a) According to the charge ratio: 40% pig iron, 18% scrap steel, 42% reheated iron, molten iron is smelted by an induction electric furnace, and the mass fraction of carbon in the molten iron w(C) and the mass fraction of silicon w(Si ), the mass fraction of all elements except iron in the molten iron w(M) i , W(M) involved in this embodiment i Same as Example 1, the graphitization degree coefficient k of the elements in the molten iron;

[0030] b) Establish a carbon equivalent formula Among them, q is the graphitization tendency index of elements, 0 is used for promoting graphitization elements, and 1 is used for hindering graphitization elements; n is the number of elements, k is the graphitization degree coefficient of elements in molten iron; q, n, and elements in molten iron The k value is shown in Table 1. The q, n, k values ​​and the mass fraction of each element measured in step a) w(M) i Subs...

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Abstract

The invention discloses a method for computing an accurate value of a carbon equivalent of cast iron and the application of the method and belongs to the technical field of cast iron alloy. According to the invention, influence of carbon, silicon and microelements on the carbon equivalent is taken into simultaneous consideration, the actual carbon equivalent of iron liquid is quickly and accurately calculated by using a mathematical modeling method, errors of theory and practice are obviously reduced, and furnace charge proportion or silicon iron addition can be timely adjusted in the production process, so the carbon equivalent approaches an eutectic point, and the casting performance and casting quality of the cast iron are improved.

Description

technical field [0001] The invention relates to a method for calculating the precise carbon equivalent value of cast iron and its application, belonging to the technical field of cast iron alloys. Background technique [0002] The iron-carbon alloy with eutectic composition has a narrow crystallization range, good fluidity of molten iron, easy feeding, and less tendency of shrinkage and porosity of castings. In production, the carbon equivalent of molten iron is usually controlled near the eutectic point to obtain high-quality castings. However, under the same carbon equivalent, pouring temperature and other conditions, when pig iron from different sources is used as raw material for casting production, the shrinkage and waste rate of castings fluctuates greatly, sometimes as high as 30%. The study found that the quality assurance indicators of foundry pig iron from ironmaking enterprises are five elements: C, Si, Mn, S, and P. The source of iron ore powder used in ironmak...

Claims

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Application Information

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IPC IPC(8): G01N21/25
Inventor 杨思一
Owner SHANDONG UNIV OF TECH
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