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A nodular cast iron base iron metallurgical state comprehensive evaluation method

A comprehensive evaluation, ductile iron technology, applied in the field of metallurgy and casting, can solve the problems of unclear influence relationship, unclear system connotation, no mapping relationship, etc., and achieve reasonable and accurate quality evaluation and production control of ductile iron raw molten iron. Effect

Inactive Publication Date: 2016-10-12
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The extension of the system is clear, that is, the spheroidizing effect of the original molten iron after spheroidizing treatment is clear; but the connotation of the system is not clear, that is, the relationship between each characteristic parameter and the quality of the original molten iron and the influence relationship between each characteristic parameter are not clear. explicit or no explicit mapping

Method used

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  • A nodular cast iron base iron metallurgical state comprehensive evaluation method
  • A nodular cast iron base iron metallurgical state comprehensive evaluation method
  • A nodular cast iron base iron metallurgical state comprehensive evaluation method

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Experimental program
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Effect test

Embodiment 1

[0019] A comprehensive evaluation parameter system for the metallurgical state of the original molten iron was established. The design of the evaluation parameter system is based on the principles of scientificity, feasibility, objectivity and comparability. From the perspective of raw molten iron production process control, analyze and rationally integrate various factors affecting the effect of spheroidization inoculation, select basic chemical components (active CEL, SiE, C and Si content, trace element content), graphite nucleation ability, A comprehensive evaluation system was established for the 7 characteristic parameters of the 4 indicators of molten iron oxidation degree and S content. figure 1 As shown, the selected characteristic parameters and their meanings of the comprehensive evaluation system are shown in Table I. 1) Basic chemical composition control. Primary austenite temperature of gray cooling curve T L Determine the liquidus line activated carbon equiv...

Embodiment 2

[0024] Construction of gray relational model for metallurgical status evaluation of raw iron. Its steps include:

[0025] 1) Under the production conditions, the appropriate interval range of each characteristic parameter in the evaluation system is obtained, that is, the "metallurgical fingerprint" window. Select the median value of each feature parameter interval to form the optimal sequence as the reference sequence x 0 ={ x 0 (j)} (j=1, 2, 3, ···, n, n represents n number of selected characteristic parameters in the comprehensive evaluation system). According to the nature of the research object, the seven characteristic parameters in the evaluation system are all fixed-value parameter indicators, that is, when each characteristic parameter reaches the value of the reference sequence, it is optimal. The characteristic parameter sequence of the metallurgical properties of the molten iron to be evaluated is used as a comparison sequence x i ={ x i (j)}( i=1, 2,..., m;...

Embodiment 3

[0038] A kind of nodular cast iron former molten iron metallurgical state comprehensive evaluation method described in embodiment 1 or 2:

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Abstract

The invention provides a nodular cast iron base iron metallurgical state comprehensive evaluation method. Before nodularizing-inoculating treatment of nodular cast iron, it is necessary to evaluate the metallurgical state of base iron comprehensively. The invention provides the nodular cast iron base iron metallurgical state comprehensive evaluation method. The method comprises the steps of 1) establishing a base iron metallurgical state comprehensive evaluation parameter system, the parameters mainly coming from characteristic values on a thermal analysis curve and on-the-spot rapid spectral component analysis results; 2) establishing a base iron metallurgical state evaluation grey correlation model or improved grey correlation model or combined grey correlation model; 3) determining the metallurgical state level of base iron according to the correlation degree comprehensive evaluation values of the grey correlation model and further guiding actual production. The method can also be used for performing base iron metallurgical state evaluation grading and quality control before vermicularizing treatment of vermicular graphite cast iron. The method is applied to the field of casting detection and metallurgy.

Description

technical field [0001] The invention belongs to the inventions and creations in the field of metallurgy and casting, and in particular relates to a method for comprehensive evaluation of the metallurgical state of the original hot metal of nodular cast iron. Background technique [0002] In the production process of ductile iron castings, the metallurgical state of the original molten iron, such as the basic chemical composition (activated carbon equivalent CEL, silicon equivalent SiE, C and Si content), graphite nucleation ability, degree of oxidation of molten iron and S content, ultimately determine the nodular The difficulty of chemical inoculation treatment and the risk of casting defects. The metallurgical state of the original molten iron is affected by many factors, showing irregular fluctuations. In order to meet the requirements of the final spheroidization inoculation effect, people often adopt a conservative approach of large-dose spheroidization treatment to ens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00C21C1/10
CPCC21C1/10G16Z99/00
Inventor 李大勇徐振宇马旭梁王利华王言峰
Owner HARBIN UNIV OF SCI & TECH