Bismuth-containing inoculating agent for cast iron and preparation method of inoculating agent

A technology of inoculant and cast iron, applied in the field of bismuth-containing inoculant for cast iron and its preparation, can solve the problems of uneven composition of the inoculant, inconsistent casting performance, affecting the quality of molten iron, etc., to promote the formation of pearlite and improve the spheroidization rate. , the effect of improving mechanical properties and ease of processing

Inactive Publication Date: 2019-05-28
JIANGSU YAFENG ALLOY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The existing inoculation treatment has the following disadvantages: 1. The composition of the mechanically mixed inoculant is uneven, there is component segregation, and the performance of the produced castings is inconsistent; 2. The actual use effect of the mixed inoculant is often not as good as the effect of using a single inoculant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The bismuth-containing inoculant for cast iron comprises the following components by weight percentage:

[0040] Silicon 64%;

[0041] Bismuth 4%;

[0042] Calcium 1%;

[0043] Aluminum 2%;

[0044] Lanthanum 3%;

[0045] Cerium 2%;

[0046] Iron 24%.

[0047] By weighing 75B ferrosilicon (silicon 72-78%, aluminum 1-3%, iron 30-35%, calcium content≤1%), metal bismuth, metal aluminum, metal lanthanum, and metal cerium, each raw material is weighed in proportion, and Break into small pieces; then put it into an intermediate frequency induction furnace for smelting, the melting temperature is 1250-1360°C, and the time is 25min. During the smelting process, constant stirring is required to fully mix the raw materials; In a water-cooled model with an inert protective gas; after the ingot is cooled, it is crushed and granulated.

Embodiment 2

[0049] The bismuth-containing inoculant for cast iron comprises the following components by weight percentage:

[0050] Silicon 60%;

[0051] Bismuth 5%;

[0052] Calcium 1%;

[0053] Aluminum 1%;

[0054] Lanthanum 2%;

[0055] Ce 1%;

[0056] Iron 30%.

[0057] By weighing 75B ferrosilicon (silicon 72-78%, aluminum 1-3%, iron 30-35%, calcium content≤1%), metal bismuth, metal aluminum, metal lanthanum, and metal cerium, each raw material is weighed in proportion, and Break into small pieces; then put it into an intermediate frequency induction furnace for melting, the melting temperature is 1250-1360°C, and the time is 20-30min. During the melting process, constant stirring is required to fully mix the raw materials; after the melting is completed, the slurry is poured Put it into a water-cooled model filled with inert protective gas; after the ingot is cooled, it can be crushed and granulated.

Embodiment 3

[0059] The bismuth-containing inoculant for cast iron comprises the following components by weight percentage:

[0060] Silicon 70%;

[0061] Bismuth 4%;

[0062] Calcium 1%;

[0063] Aluminum 2%;

[0064] Lanthanum 2%;

[0065] Ce 1%;

[0066] Iron 20%.

[0067] By weighing 75B ferrosilicon (silicon 72-78%, aluminum 1-3%, iron 30-35%, calcium content≤1%), metal bismuth, metal aluminum, metal lanthanum, and metal cerium, each raw material is weighed in proportion, and Break into small pieces; then put it into an intermediate frequency induction furnace for melting, the melting temperature is 1250-1360°C, and the time is 20-30min. During the melting process, constant stirring is required to fully mix the raw materials; after the melting is completed, the slurry is poured Put it into a water-cooled model filled with inert protective gas; after the ingot is cooled, it can be crushed and granulated.

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PUM

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Abstract

The invention discloses a bismuth-containing inoculating agent for cast iron and a preparation method of the inoculating agent. The inoculating agent comprises, by weight percentage, 60-70% of silicon, 1-5% of bismuth, 1-3% of calcium, 1-5% of aluminum, 2-7% of a mixed rare earth metal element, and 20-30% of iron. The bismuth-containing inoculating agent for the cast iron can be applied to variousgray iron casting production processes; by adding in the bismuth element, iron phosphide eutectic is decreased and decomposed, the reverse chill effect of a casting is inhibited, the fracture surfacesensitivity of the casting after inoculating is lowered, the graphite form is changed, the rate of spheroidization is increased, and the ferrite content in a casting matrix structure is remarkably increased; by adding in the rare earth metal element, the effects of evolving molten iron, increasing the supercooling degree, and promoting pearlite forming and refining crystalline grains are achieved; and by controlling the content of aluminum and calcium, aluminum and calcium oxide in the molten iron is within a reasonable content range, inoculating interference of the aluminum and calcium oxideon other elements is prevented, and the mechanical performance and the easy-to-machine performance of the casting are effectively improved.

Description

technical field [0001] The invention relates to a bismuth-containing inoculant for cast iron and a preparation method thereof, belonging to the technical field of casting. Background technique [0002] Cast iron is an iron-carbon alloy with a carbon content greater than 2.1%. It is obtained by remelting cast iron (part of steelmaking pig iron) in a furnace, adding ferroalloy, scrap steel, and returned iron to adjust the composition. The difference from pig iron is that cast iron is secondary processing, mostly processed into cast iron. Iron castings have excellent castability and can be made into complex parts, and generally have good machinability. In addition, it has the characteristics of good wear resistance and shock absorption, and low price. [0003] At present, the following measures are often taken to improve the performance of gray cast iron: [0004] (1) Reasonable selection of chemical composition [0005] The carbon content of gray cast iron is mostly 2.6% t...

Claims

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Application Information

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IPC IPC(8): C22C33/08B22D1/00C22C28/00C22C1/03
Inventor 陈明何赛洲
Owner JIANGSU YAFENG ALLOY MATERIAL
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