Carbide-containing ductile iron and its making method

A technology of carbide and ductile iron, which is applied in the field of casting, can solve the problems of coarse carbide structure, low strength and toughness of carbide-containing ductile iron, and achieve the effects of low production cost, good wear resistance and improved strength and toughness

Inactive Publication Date: 2013-04-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the currently developed carbide-containing ductile iron generally has carbides distributed in a continuous network, and the carbide structure is coarse, resul...

Method used

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  • Carbide-containing ductile iron and its making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Using a 1000 kg medium frequency induction furnace to smelt carbide-containing ductile iron, the manufacturing process steps are:

[0036] (1) Mix and heat scrap steel, pig iron, ferrochrome, ferrosilicon and ferromanganese, adjust the composition before the furnace and raise the temperature to 1478°C, and then take it out of the furnace;

[0037] (2) Put passivated granular magnesium with a particle size of 1.0-2.5 mm and potassium-containing substances with a particle size of 3-8 mm, ferrovanadium, ferromanganese nitride, and ferro-titanium on the bottom of the ladle, and use the method of flushing into the ladle The molten iron undergoes compound modification and spheroidization treatment;

[0038] (3) When the temperature of the molten iron reaches 1359°C, pour the molten iron into the mold, and during the pouring process, add 0.75% of the ferrosilicon inoculant and 1.00% of the silicon barium calcium inoculant with the mass fraction of the pouring molten iron.

[...

Embodiment 2

[0045] Using a 3-ton cupola to smelt carbide-containing ductile iron, the manufacturing process steps are:

[0046] (1) Mix and heat scrap steel, pig iron, ferrochrome, ferrosilicon and ferromanganese, adjust the composition before the furnace and raise the temperature to 1434°C, and then take it out of the furnace;

[0047] (2) Put passivated granular magnesium with a particle size of 1.0-2.5 mm and potassium-containing substances with a particle size of 3-8 mm, ferrovanadium, ferromanganese nitride, and ferro-titanium on the bottom of the ladle, and use the method of flushing into the ladle The molten iron undergoes compound modification and spheroidization treatment;

[0048] (3) When the temperature of the molten iron reaches 1335°C, the molten iron is poured into the mold, and during the pouring process, 0.50% of the ferrosilicon inoculant and 1.20% of the silicon-barium-calcium inoculant are added along with the pouring molten iron.

[0049] (4) After casting for 1 hour...

Embodiment 3

[0055] Using a 1000 kg medium frequency induction furnace to smelt carbide-containing ductile iron, the manufacturing process steps are:

[0056] (1) Mix and heat scrap steel, pig iron, ferrochrome, ferrosilicon and ferromanganese, adjust the composition before the furnace, raise the temperature to 1451°C, and then take it out of the furnace;

[0057] (2) Put passivated granular magnesium with a particle size of 1.0-2.5 mm and potassium-containing substances with a particle size of 3-8 mm, ferrovanadium, ferromanganese nitride, and ferro-titanium on the bottom of the ladle, and use the method of flushing into the ladle The molten iron undergoes compound modification and spheroidization treatment;

[0058] (3) When the temperature of the molten iron reaches 1342°C, the molten iron is poured into the mold, and during the pouring process, 0.65% of the ferrosilicon inoculant and 1.10% of the silicon-barium-calcium inoculant are added with the flow.

[0059] (4) Open the box and a...

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Abstract

The invention discloses a carbide-containing ductile iron and its making method. The carbide-containing ductile iron comprises the following components, by mass, 3.40-3.65% of C, 2.35-2.80% of Si, 2.80-3.15% of Mn, 1.60-1.85% of Cr, 0.04-0.06% of Mg, 0.03-0.05% of K, 0.008-0.016% of Ca, 0.018-0.035% of Ba, 0.03-0.06% of Ti, 0.025-0.050% of V, 0.012-0.018% of N, 0.10% or less of P, 0.02% or less of S, and the balance Fe and inevitable impurities. The carbide-containing ductile iron can be obtained through melting in an electric furnace or a cupola furnace, cast forming and isothermal quenching, and has the advantages of excellent performances, low cost, application popularization, and good effects.

Description

technical field [0001] The invention discloses a preparation method of ductile iron, in particular relates to carbide-containing ductile iron and a preparation method thereof, belonging to the technical field of casting. Background technique [0002] Wear-resistant materials account for a considerable proportion of energy consumption and economic costs in metallurgy, mining, cement, thermal power generation and other industrial fields. The 2009 Chinese Academy of Engineering Consulting Research Report shows that in 2006, the national consumption of friction, wear and lubrication was 950 billion yuan, accounting for 4.5% of the gross national product (GDP). According to incomplete statistics, only the losses of crushing equipment, excavator bucket teeth, and slurry pumps are not less than 20 billion yuan per year, of which, the grinding balls are not less than 10 billion yuan, the lining plate is not less than 4 billion yuan, and the hammer head is not less than 4 billion yua...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08
Inventor 符寒光蒋志强马跃冯锡兰雷永平魏永强刘建伟
Owner BEIJING UNIV OF TECH
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