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Cast iron inoculant and method for production of cast iron inoculant

An inoculant and cast iron technology, applied in the field of ferrosilicon-based inoculants, can solve the problem of low nucleation number occurrence rate

Inactive Publication Date: 2001-01-24
ELKEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, it has been found that with the inoculant of WO 95 / 24508, the occurrence of nucleation numbers is rather low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Production of inoculants

[0027] A batch of 10000g particle size is 0.5-2mm, and contains about 1% (weight) of calcium, 1% (weight) of cerium and 1% (weight) of magnesium 75% ferrosilicon inoculant and shown in table 1 Different amounts of powdered iron oxide and iron sulfide were mixed mechanically. This mixing is carried out with a high speed drum mixer, resulting in a homogeneous mixture of the different inoculants. Also shown in Table 1 are the analytical oxygen and sulfur contents of the five inoculants A-E produced. It can be seen from Table 1 that inoculant A does not add oxygen and sulfur. Inoculant B has sulfur added only. Inoculants C and D are supplemented with oxygen only, while inoculant E according to the invention is supplemented with oxygen and sulfur.

[0028] test

Embodiment 2

[0030] Production of inoculants

[0031] A batch of 10000g of ferrosilicon with a particle size of 0.2-1mm and containing 65-75% of the elements in Table 2 was mechanically mixed with powdered iron oxide and iron sulfide raw materials. This mixing with a high speed drum mixer results in a homogeneous mixture of the different inoculants. The amounts of sulfide and iron oxide powder mixed with this ferrosilicon base material are also shown in Table 2. The 3 powder mixtures were agglomerated with sodium silicate solution. After powder mixing, 3% sodium silicate solution was added and agglomerated in a press, followed by crushing into a final product with a size of 0.5-2 mm.

[0032] No.

[0033] As can be seen from Table 2, the inoculant F is the corresponding prior art, and the inoculants G-K are the corresponding present invention.

Embodiment 3

[0035] Application of inoculants

[0036] The inoculant mixture produced according to Example 1 was tested on ductile cast iron to reveal how the mixture of sulphides and oxides affects the 2 The number of graphite balls in the The number of graphite nodules formed is a measure of the number of nuclei in the molten iron. Treat the molten iron charge with a conventional magnesium-silicon-iron alloy, and then add the inoculants A-F of Example 1 to the ladle. The final iron composition was 3.7% of C, 2.5% of Si, 0.2% of Mn, 0.04% of Mg, and 0.01% of S.

[0037] Table 3 shows the number of nodules in sand cast slabs with a cross-sectional size of 5 mm.

[0038] Experiment number

[0039] From the results in Table 3, it can be seen that the inoculant E corresponding to the present invention shows a very high nodule number, which is about 50% higher than that of the inoculant A containing neither oxygen nor sulfur, and significantly higher than that of the inoculant A c...

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PUM

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Abstract

The invention relates to an inoculant for the manufacture of cast iron with lame llar, compacted or spheroidal graphite. The inoculant comprises between 40 and 80 % by weight of silicon, between 0.5 and 10 % by weight of calcium and / or strontium and / or barium, between 0 and 10 % by weight of cerium and / or lanthanum, between 0 and 5 % by weight of magnesium, less than 5% by weight of aluminium, between 0 and 10 % by weight of manganese and / or titanium and / or zirconium, between 0.5 and 10 % by weight of oxygen in the form of one or more metal oxides, the balanc e being iron, said inoculant further comprising between 0,1 and 10 % by weight of sulphur in the form of one or more metal sulphides. The invention further relate s to a method for the production of the inoculant.

Description

technical field [0001] The present invention relates to a ferrosilicon-based inoculant for the production of cast iron containing flaky, dense or spherical graphite, and to a process for the production of the inoculant. Background technique [0002] Cast iron is generally produced in cupola or induction furnaces and generally contains 2-4% carbon. This carbon is intimately mixed with iron, and the form that carbon takes in solidified cast iron is very important to the characteristics and performance of iron castings. If this carbon is in the form of iron carbide, the cast iron is called white iron, and its physical properties are hard and brittle, which is not suitable for some applications. If the carbon is in the graphite state, the cast iron is soft and easy to work, and it is called gray cast iron. [0003] Graphite can be present in cast iron in flake, compact or spherical form and in various amounts thereof. The spherical form produces the highest strength and most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10C22C33/08C22C37/00
CPCC21C1/10C22C33/08
Inventor T·斯卡兰德
Owner ELKEM
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