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Method of analysing iron melt

一种熔体、热分析的技术，应用在制造蠕墨铸铁领域

Active Publication Date: 2015-08-26
VOLVO TRUCK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method does not take into account the possible variations in a) the initial (pouring) temperature of the melt, b) the refractory cup filling ratio, and c) the carbon equivalent (melt The carbon equivalent of is expressed as CE=C+Si / 4+P / 2, or alternatively, as CE=C+(Si+P) / 3, where C is the mass % of carbon and Si is the mass % of sulfur , and P is the mass% of phosphorus)

Method used

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  • Method of analysing iron melt
  • Method of analysing iron melt

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Experimental program
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Effect test

Embodiment approach

[0069] According to an embodiment of the invention, the above analysis and prediction of the nodularity ratio for a particular melt forms part of a method for manufacturing compacted graphite iron. According to one embodiment of the invention, the method comprises the steps of: providing a melt comprising predetermined amounts of carbon, magnesium, balance iron and unavoidable impurities; casting at least a portion of the melt in a mould; and Thermal analysis of a casting melt during cooling of the casting melt and prediction of the nodularity of the casting melt are taught. Thereafter, according to the foregoing teachings (wherein the nodularity is preferably estimated according to ISO16112:2006 Appendix B), as a test for the nodularity within a predetermined range (the range is preferably 0 to 30%, and more preferably 0 to 20%) % nodularity) in response to the predicted nodularity, changing the content of the nodularity influencing agent in the remainder of the melt that has...

Embodiment

[0075] A melt having a composition (in mass %) according to Table 1 was prepared in an induction furnace of the intermediate frequency type with a melting capacity of 4 tons. The melt was incubated with 0.1% Inobar and 0.02% RE (rare earth). The composition of the respective melts was measured by means of a spectrometer. Cekv is the carbon equivalent of the corresponding melt, expressed as CE=%C+%Si / 4+%P / 2.

[0076] Table 1

[0077] Test No.

[0078] Samples of the test melts presented in Table 1 were fabricated by casting the corresponding melts in molds having cavities that produced structures with stepped geometries (eg Figure 7 presented), with a thickness in the range of 8 mm to 70 mm (from the thinnest to the thickest rung).

[0079] During the cooling of the cast melt, the temperature of the melt was measured versus time by means of a K-type thermocouple (QuiK-Cup (manufacturer: Heraeus Electro-Nite)) and plotted. The sampling rate was 1 Hz and the obtain...

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Abstract

A method of analysing an iron melt for producing compacted graphite iron, comprising the steps of: receiving thermal data from cooling of a cast melt comprising a predetermined amount of carbon, magnesium, balance iron and unavoidable impurities, plotting the temperature of the cast melt against time such that a plotted time-temperature curve is generated, comparing the generated plotted curve to at least one reference curve, said reference curve representing a corresponding thermal analysis of another melt, the resulting nodularity of which is known, for the purpose of predicting the nodularity of the cast melt on basis of the difference between said curves. The comparison on which the nodularity is predicted is performed along each of said curves for a time interval t1-t2 corresponding to a temperature interval T1-T2, where T1 is in the range of TEstart - TEmim where TEstart is the temperature of beginning formation of graphite in the melt and TEmin is a minimum temperature before start of eutectic recalescence in the melt, and T2 is in the range of Tsolidus-(Tsolidus-20oC), and other time intervals in said curves are excluded from said comparison.

Description

technical field [0001] The present invention relates to a method of analyzing an iron melt for the manufacture of compacted graphite cast iron comprising the steps of: receiving thermal data from the cooling of a casting melt containing predetermined amounts of carbon, magnesium, balance iron and unavoidable impurities; for mapping time versus temperature of the casting melt such that a plotted time-temperature curve is generated; and comparing the generated plotted curve with at least one reference curve for predicting sphericity of the casting melt based on differences between the curves For the purpose of spheroidization, the reference curve represents the corresponding thermal analysis obtained for another melt for which the spheroidization is known. [0002] The present invention also relates to a method of manufacturing compacted graphite iron comprising the steps of: providing a melt comprising predetermined amounts of carbon, magnesium, balance iron and unavoidable imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/20G01N25/04
CPCG01N25/04G01N33/206G01N33/205
Inventor 哈米德·侯赛因霍施亚尔波尔·施密特
Owner VOLVO TRUCK CORP
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