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Smelting method for medium-strength and high-ductility ductile cast iron

A technology with high strength and elongation, which is applied in the smelting field of ductile iron with high strength and elongation, can solve the problems that the quality of molten iron cannot be effectively improved, is not good, and is not applicable

Active Publication Date: 2016-08-24
江苏力源金河铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production process still has the following defects: 1. The quality of molten iron cannot be effectively improved; 2. It is only suitable for the production of high-strength and high-elongation ductile iron, not suitable for the production of medium-strength and high-elongation ductile iron; 3. . Although the elongation of ductile iron has been improved, it is still not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The smelting method of medium strength and high elongation ductile iron of the present embodiment, the smelting method is carried out according to the following steps:

[0031] (1) Feeding smelting: Add 1.0 parts by mass of recarburizer and 32 parts by mass of low-manganese scrap steel to the electric furnace at the same time for smelting. The mass fractions of the components in the low-manganese scrap steel are respectively C: 0.018%, Si: 0.10%, Mn: 0.13%, P: 0.05%, S: 0.017%, Cr: 0.05%, Ti: 0.038%, V: 0.040%, and the balance is Fe; then add 42 parts by mass of returned charge, and then add 1.0 parts by mass of For ferrosilicon, 32 parts by mass of Q10 pig iron was finally added for smelting to form raw molten iron. The mass fractions of each component in Q10 pig iron were C: 4.31%, Si: 0.86%, Mn: 0.09%, P: 0.026%, S : 0.006%, Cr: 0.013%, Ti: 0.015%, V: 0.010%, and the balance is Fe; the mass fractions of each component in the original molten iron are respectively C: 3...

Embodiment 2

[0040] The smelting method of medium strength and high elongation ductile iron of the present embodiment, the smelting method is carried out according to the following steps:

[0041] (1) Feeding smelting: Add 1.05 parts by mass of recarburizer and 30 parts by mass of low-manganese scrap steel to the electric furnace at the same time for smelting. The mass fractions of the components in the low-manganese scrap steel are C: 0.018%, Si: 0.10%, Mn: 0.13%, P: 0.05%, S: 0.017%, Cr: 0.05%, Ti: 0.038%, V: 0.040%, and the balance is Fe; then add 40 parts by mass of recycled charge, and then add 0.96 parts by mass of For ferrosilicon, 30 parts by mass of Q10 pig iron was finally added for smelting to form raw molten iron. The mass fractions of each component in Q10 pig iron were C: 4.31%, Si: 0.86%, Mn: 0.09%, P: 0.026%, S : 0.006%, Cr: 0.013%, Ti: 0.015%, V: 0.010%, and the balance is Fe; the mass fractions of each component in the original molten iron are respectively C: 3.85%, Si: 1...

Embodiment 3

[0050] The smelting method of medium strength and high elongation ductile iron of the present embodiment, the smelting method is carried out according to the following steps:

[0051] (1) Feeding smelting: Add 1.1 parts by mass of recarburizer and 28 parts by mass of low-manganese scrap steel to the electric furnace for smelting. The mass fractions of the components in the low-manganese scrap steel are C: 0.018%, Si: 0.10%, Mn: 0.13%, P: 0.05%, S: 0.017%, Cr: 0.05%, Ti: 0.038%, V: 0.040%, and the balance is Fe; then add 38 parts by mass of recycled charge, and then add 0.93 parts by mass of For ferrosilicon, 28 parts by mass of Q10 pig iron was finally added for smelting to form raw molten iron. The mass fractions of the components in Q10 pig iron were C: 4.31%, Si: 0.86%, Mn: 0.09%, P: 0.026%, S : 0.006%, Cr: 0.013%, Ti: 0.015%, V: 0.010%, and the balance is Fe; the mass fractions of each component in the original molten iron are respectively C: 3.90%, Si: 1.75%, Mn: 0.38%, ...

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Abstract

The invention relates to a smelting method for medium-strength and high-ductility ductile cast iron. Ductile cast iron castings are manufactured through feeding and smelting, constituent fine adjusting, molten iron pre-treating, molten iron refining, spheroidizing and casting forming. The smelting method has the advantages that pig iron is added finally in the feeding process, and burning loss of crystalline cores in molten iron can be prevented; carbon and silicon carbide are added simultaneously in the pre-treating process, 1 / 3 of the molten iron needs to be poured out from a furnace, the liquid level of the molten iron left in the furnace can be located below an induction coil of the electric furnace, the stirring strength is improved when the molten iron is heated, and therefore the molten iron can fully absorb the carbon and the silicon carbide, and the pre-treating effect is guaranteed; the secondary inoculation treatment process is adopted for the inoculation treatment, inoculants are added into balling tundishes when the weight of balled output iron accounts for 1 / 3 of the weight of output iron, and therefore inoculation of the molten iron is fully guaranteed, the strength of the manufactured ductile cast iron can reach the medium strength, and the ductility is high.

Description

technical field [0001] The invention belongs to the field of chemical smelting, in particular to a method for smelting ductile iron with medium strength and high elongation. Background technique [0002] Ductile cast iron is a kind of cast iron in which the graphite in cast iron is spherical. The graphite is formed into a spherical shape through spheroidizing treatment. This spherical graphite can reduce the stress concentration and reduce the cracking of the matrix. Due to the high strength, plasticity and toughness of ductile iron, the fatigue strength is close to that of medium carbon steel, the wear resistance is better than that of non-alloy steel, the cutting performance is comparable to that of gray cast iron, and the manufacturing cost is low, it has been widely used. . [0003] In the production process of nodular cast iron, molten iron can be formed after melting raw materials with different ratios. The quality of molten iron and the effect of spheroidizing inocul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10C22C37/10C22C37/04C22C33/08
CPCC21C1/10C22C33/08C22C37/04C22C37/10
Inventor 章桂林
Owner 江苏力源金河铸造有限公司
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