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Ferrite spheroidal graphite cast iron profile and preparation method thereof

A ductile iron and ferrite technology, applied in the field of ferritic ductile iron profiles and their preparation, to achieve the effects of large elongation, elimination of carbides, and roundness of graphite balls

Inactive Publication Date: 2019-06-25
HANDAN HENGGONG METALLURGICAL MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN201610496177.4 discloses a "ferritic ductile iron and its preparation method". This invention adjusts the content of carbon, silicon and manganese in molten iron by selecting high-quality raw materials. The molten iron is deoxidized and purified, pretreated and spheroidized Inoculation treatment can obtain high strength and high toughness ferritic ductile iron, but the strength and toughness of ferritic ductile castings can be further improved

Method used

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  • Ferrite spheroidal graphite cast iron profile and preparation method thereof
  • Ferrite spheroidal graphite cast iron profile and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A ferritic nodular cast iron profile, which is made of QT500-7 material The profile is prepared from the following elements according to the mass percentage: carbon: 3.4%, silicon: 3.3%, manganese: 0.27%, bismuth: 0.01%, phosphorus: 0.05%, sulfur: 0.012%, and the rest is iron.

[0027] The QT500-7 material prepared according to the above mass percentage The profiles have excellent properties and have the advantages of high strength and large elongation.

Embodiment 2

[0029] A preparation method for a ferritic ductile iron profile, specifically comprising the following steps:

[0030] (1) Furnace preparation. After the combination of water-cooled graphite crystallizer and continuous casting and drawing holding furnace is installed, use natural gas to bake the continuous casting and drawing holding furnace. The baking time is 3-5 hours. Continuous casting before production The temperature in the holding furnace for drawing is 500-600°C;

[0031] (2) Ingredients Calculate and weigh pig iron, scrap steel, furnace charge and recarburizer according to the following target values: carbon: 3.4%-3.5%, silicon: 2.1%-2.2%, manganese: 0.22%-0.32%;

[0032] (3) Smelting, using medium-frequency induction furnace for smelting, put the weighed pig iron, scrap steel, returned materials and recarburizer into medium-frequency induction furnace for smelting, the molten iron is raised to between 1500-1550°C, after overheating is completed, transfer to continuo...

Embodiment 3

[0038] A method for preparing a ferritic ductile iron profile, specifically comprising the following steps:

[0039] (1) Furnace preparation, after the combination of the water-cooled graphite crystallizer and the holding furnace for continuous casting and drawing is installed, use natural gas to bake the holding furnace for continuous casting and drawing, the baking time is 4 hours, and the continuous casting and drawing before production The temperature in the holding furnace is 500°C;

[0040](2) Ingredients Calculate and weigh the above metal materials according to the following target values: carbon: 3.5%, silicon: 2.15%, manganese: 0.30%;

[0041] (3) Smelting, using medium-frequency induction furnace for smelting, put the weighed pig iron, scrap steel, returned material and recarburizer into medium-frequency induction furnace for smelting, and the molten iron is raised to 1500 ° C. After the overheating is completed, transfer to continuous molten iron The holding furna...

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Abstract

The invention belongs to the technical field of cast iron materials and casting metallurgy, and particularly relates to a ferrite spheroidal graphite cast iron profile and a preparation method thereof. The ferrite spheroidal graphite cast iron profile is prepared from the following elements according to the mass percentage: 3.35% to 3.45% of carbon, 3.2% to 3.4% of silicon, 0.20% to 0.30% of manganese, 0.002%-0.01% of bismuth, 0.02%-0.05% of phosphorus, 0.006%-0.015% of sulfur, and the balance being iron. The strength and toughness of the ferrite spheroidal graphite cast iron profile are improved; and the ferrite spheroidal graphite cast iron profile has the advantage of strong practicability.

Description

technical field [0001] The invention belongs to the technical field of cast iron materials and casting metallurgy, and in particular relates to a ferritic nodular cast iron profile and a preparation method thereof. Background technique [0002] Ductile cast iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. It is based on its excellent performance that it has been successfully used to cast some complex stress, strength, toughness, and wear resistance. Parts with high performance requirements. [0003] Ferritic ductile iron refers to ductile iron with a ferrite content greater than 80% in the matrix and the remainder being pearlite. It has good impact plasticity and toughness, but low strength. It is used to manufacture parts with high force and vibration and impact. It is widely used in automobiles, agricultural machinery, ships, metallurgy, chemical industry and other departments, and has become an im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/10B22D11/045
Inventor 魏志勇王敬民孔令伟
Owner HANDAN HENGGONG METALLURGICAL MACHINERY CO LTD
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