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Smelting method for high-strength thick and large ductile iron

A thick, high-strength technology, which is applied in the smelting field of high-strength thick and large ductile iron, can solve the problems of burning loss and low performance, and achieve the effects of preventing burning loss, high strength and anti-distortion of graphite

Inactive Publication Date: 2016-09-21
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

At present, when conventional manufacturers produce thick and large ductile iron, they have the following disadvantages: 1. The microscopic solid phase particles of graphite heterogeneity in the molten iron are easy to be severely burnt; 2. Generally, the strength of thick and large ductile iron is It has reached the qualified standard of the strength specified in the national standard, but it is still at a low performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The smelting method of the high-strength thick and large ductile iron of the present embodiment, the smelting method is carried out according to the following steps:

[0024] (1) Add 32 parts by mass of steel scrap to an intermediate frequency induction furnace for smelting. The mass fractions of each component in the steel scrap are C: 0.030%, Si: 0.40%, Mn: 0.42%, P: 0.03%, S: 0.01% , Cr: 0.04%, Ti: 0.05%, V: 0.040%, and the balance is Fe; then add 68 parts by mass of returned material, and keep it warm for 8 minutes when the temperature of the molten iron in Luzhong reaches 1510°C. At the same time, add 0.4 parts by mass of 65 Ferromanganese, 0.2 parts by mass of electrolytic copper and 0.01 parts by mass of metallic tin are subjected to quenching and tempering treatment to form the original molten iron. The mass fractions of each component in the original molten iron are respectively C: 3.5%, Si: 1.85%, Mn: 0.7%, P: 0.03%, S: 0.030%, Cu: 0.8%, Sn: 0.04%, the balance...

Embodiment 2

[0029] The smelting method of the high-strength thick and large ductile iron of the present embodiment, the smelting method is carried out according to the following steps:

[0030](1) Add 28 parts by mass of scrap steel to an intermediate frequency induction furnace for smelting, and the mass fractions of each component in the scrap steel are C: 0.020%, Si: 0.30%, Mn: 0.35%, P: 0.01%, S: 0.008% , Cr: 0.03%, Ti: 0.03%, V: 0.0:20%, and the balance is Fe; then add 72 parts by mass of returned material, and keep it warm for 8 minutes when the temperature of the molten iron in Luzhong reaches 1510 ° C. At the same time, by adding 0.3 parts by mass 65 ferromanganese, 0.3 parts by mass of electrolytic copper and 0.02 parts by mass of metallic tin are subjected to quenching and tempering treatment to form the original molten iron. The mass fractions of each component in the original molten iron are C: 3.4%, Si: 1.75%, Mn: 0.6 %, P: 0.01%, S: 0.020%, Cu: 0.7%, Sn: 0.03%, the balance i...

Embodiment 3

[0035] The smelting method of the high-strength thick and large ductile iron of the present embodiment, the smelting method is carried out according to the following steps:

[0036] (1) Add 30 parts by mass of scrap steel to an intermediate frequency induction furnace for smelting. The mass fractions of each component in the scrap steel are C: 0.025%, Si: 0.35%, Mn: 0.39%, P: 0.0:2%, S: 0.0:09%, Cr: 0.035%, Ti: 0.04%, V: 0.030%, and the balance is Fe; then add 70 parts by mass of recycled material, and keep it warm for 8 minutes when the temperature of the molten iron in Luzhong reaches 1510°C, and at the same time add 0.35 65 parts by mass of ferromanganese, 0.25 parts by mass of electrolytic copper and 0.015 parts by mass of metallic tin are subjected to quenching and tempering treatment to form the original molten iron. The mass fractions of each component in the original molten iron are C: 3.45%, Si: 1.8%, Mn : 0.65%, P: 0.0:2%, S: 0.025%, Cu: 0.75%, Sn: 0.035%, the balanc...

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Abstract

The invention relates to a smelting method for high-strength thick and large ductile iron. Steel scrap is added into a medium-frequency induction electric furnace to be smelted, then foundry returns are added, heat preservation is performed for 5 min to 10 min when the temperature of molten iron in the furnace reaches 1500 DEG C to 1520 DEG C, meanwhile, quenching and tempering treatment is performed, and base iron is formed; a spheroidizing agent is added into a spheroidizing reaction pit of a spheroidizing tundish, then the spheroidizing agent is covered with an inoculant, and finally the inoculant is covered with a 0 silicon steel sheet; when the temperature of the base iron reaches 1430 DEG C to 1460 DEG C, the base iron is discharged out of the furnace to enter the spheroidizing tundish, when a spheroidizing reaction breaks out and begins, the inoculant is added into the spheroidizing tundish again, and after spheroidizing, final molten iron is formed; and after spheroidizing ends, the final molten iron is subjected to pouring and casting at the temperature of 1320 DEG C to 1340 DEG C within 10 min, meanwhile, a third-time inoculant is added, after pouring, when a casting is cooled to 830 DEG C to 880 DEG C, a box is opened for air cooling, and a ductile iron pearlite is obtained. The smelting method has the beneficial effects that the smelting method can prevent burning losses of crystallizing nucleation in molten iron, the molten iron quality is improved, and strength can also be substantially improved.

Description

technical field [0001] The invention belongs to the field of chemical smelting, in particular to a smelting method of high-strength thick and large ductile iron. 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. . In particular, thick and large pieces of ductile iron occupy an extremely important position in the material market. With the development of the equipment manufacturing industry in the direction of high power, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/10C22C37/04C22C37/10C21C1/10
CPCC21C1/105C22C33/10C22C37/04C22C37/10Y02P10/20
Inventor 章桂林
Owner 江苏力源金河铸造有限公司
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