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Nodular cast iron with high strength, high plasticity and thermal change tolerance, and manufacturing method thereof

A technology of ductile cast iron and its manufacturing method, which is applied in the field of heat-resistant ductile cast iron and its manufacture, high plasticity and high strength, which can solve the problems of low strength and achieve the effect of improving high strength

Inactive Publication Date: 2017-11-24
MAANSHAN WANXIN CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the other extreme are high plastic grades with elongation greater than 17% and correspondingly lower strength (minimum 370 N / mm2)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add steel scrap, pig iron, recycled materials and alloys into the intermediate frequency electric furnace according to the ingredients. After smelting, the chemical composition of the main elements of the molten iron (wt%) C: 3.7%, Si: 1.5%, Al: 10.5%, Mo: 3.3%, Cu: 3.12%, Cr: 0.23%, Mg: 0.26%, Ni: 2.17%, V: 0.022~%, Zn: 2.12%, Hg: 0.012%, Re: 0.03%, P<0.12, S<0.03, the rest It is Fe to obtain the original molten iron; the temperature of the original molten iron is 1641 ° C ~ 1687 ° C, after being released from the furnace, it is sealed, and the nodulizer and 0.36 ~ 0.41% of the weight of the original molten iron are added by using the method of pouring into the bag. inoculant and 0.36-0.39% of copper; when the temperature of the original molten iron drops to 1350 ° C ~ 1410 ° C, and add the inoculant of 0.33 ~ 0.37% of the weight of the original molten iron for inoculation with the flow; the obtained molten iron is sealed and poured. When the temperature drops to 100°C...

Embodiment 2

[0032] Add steel scrap, pig iron, recycled materials and alloys into the intermediate frequency electric furnace according to the ingredients. After smelting, the chemical composition of the main elements of the molten iron (wt%) C: 4.1%, Si: 1.7%, Al: 10.95, Mo: 3.8%, Cu Fe , to obtain the original molten iron; the temperature of the original molten iron is 1641 ° C ~ 1687 ° C, after the furnace is sealed, the weight of the original molten iron is added by using the method of pouring into the bag. Inoculants and 0.36-0.39% copper; when the temperature of the original molten iron drops to 1350 ° C ~ 1410 ° C, and add inoculants of 0.33 ~ 0.37% of the weight of the original molten iron; When the temperature reaches 100℃~300℃, open the seal.

[0033] Wherein, the inoculant is ferrosilicon inoculant, composed of 73.5wt% silicon and 26.5wt% iron;

[0034] The weight percent of each component in the nodulizer is Mg: 5.0-7.0%, Re: 3.3-3.5%, Si: 28-31%, Cr: 0.5-0.6%, Al: 12.9-21.2%...

Embodiment 3

[0038]Add steel scrap, pig iron, recycled materials and alloys into the intermediate frequency electric furnace according to the ingredients. After smelting, the chemical composition of the main elements of the molten iron (wt%) C: 4.35%, Si: 1.85%, Al: 11.15%, Mo: 4.3%, Cu: 4.1-4.2%, Cr: 0.31%, Mg: 0.46%, Ni: 2.67%, V: 0.032%, Zn: 3.12-3.21%, Hg: 0.018%, Re: 0.05%, P<0.12, S< 0.03, the rest is Fe, to obtain the original molten iron; the temperature of the original molten iron is 1641 ° C ~ 1687 ° C, after the furnace is sealed, the nodulizer, 0.36 ~0.41% inoculant and 0.36~0.39% copper; when the temperature of the original molten iron drops to 1350 ℃ ~ 1410 ℃, and add inoculant of 0.33~0.37% of the weight of the original molten iron for inoculation with the flow; the obtained molten iron is sealed Pouring, when the temperature drops to 100℃~300℃, open the seal.

[0039] Wherein, the inoculant is ferrosilicon inoculant, composed of 73.5wt% silicon and 26.5wt% iron;

[0040] ...

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Abstract

The invention discloses high-strength, high-plasticity, heat-resistant variable ductile iron and a manufacturing method thereof, and relates to the technical field of ductile iron materials. The weight percentage of each component is as follows: C: 3.7-4.5%, Si: 1.5-2.0%, Al: 10.5-12.5%, Mo: 3.3-4.5%, Cu: 3.1-4.2%, Cr: 0.23-0.32%, Mg: 0.26~0.59%, Ni: 2.17~2.73%, V: 0.022~0.043%, Zn: 2.12~3.21%, Hg: 0.012~0.021%, Re: 0.03~0.05%, P<0.12, S<0.03, The rest is Fe. The present invention realizes the high strength, high plasticity and heat resistance characteristics of the nodular cast iron by adopting multi-elements for the preparation of alloy castings; adopts the sealed molten iron inoculation method, so that Hg is alloyed with aluminum after the temperature is lowered, through The combination of Hg and aluminum realizes the heat resistance of the nodular cast iron. When the heat change is large, the alloy of aluminum and Fe is formed by Hg aluminum alloy under the reduction of Fe, which further improves the high strength of the nodular cast iron.

Description

technical field [0001] The invention belongs to the technical field of nodular cast iron materials, in particular to high-strength, high-plasticity, heat-resistant variable nodular cast iron and a manufacturing method thereof. Background technique [0002] Ductile iron castings are used in almost all major industrial sectors requiring high search strength, plasticity, toughness, wear resistance, resistance to severe thermal and mechanical shocks of ductile iron, high or low temperature resistance, corrosion resistance and dimensional stability etc. To meet these changes in service conditions, ductile iron is available in many grades, offering a wide range of mechanical and physical properties. [0003] Most of the ductile iron castings, as specified by the International Organization for Standardization ISO1083, are mainly produced in an unalloyed state. Obviously, this range includes high strength grades with a tensile strength greater than 800 N / mm2 and an elongation of 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/08
CPCC22C37/10C22C33/08C22C37/04C22C37/08
Inventor 张立安魏明军
Owner MAANSHAN WANXIN CASTING
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