A kind of high-strength ductile iron Qt900-6 and preparation method thereof

A nodular cast iron, high-strength technology, applied in the field of cast iron metallurgy, to achieve the effect of improving metallurgical quality, improving high-temperature mechanical properties, and excellent performance

Active Publication Date: 2017-12-22
西峡县内燃机进排气管有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The tensile strength prepared by this invention is ≥600MPa, which is not suitable for materials with higher strength requirements

Method used

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  • A kind of high-strength ductile iron Qt900-6 and preparation method thereof
  • A kind of high-strength ductile iron Qt900-6 and preparation method thereof
  • A kind of high-strength ductile iron Qt900-6 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A high-strength ductile iron QT900-6, composed of the following elements by weight percentage: C: 3.2%, Si: 2.6%, Mn: 0.1%, P: 0.015%, S: 0.005%, Cu: 0.9%, The balance is Fe and unavoidable trace elements.

[0039] The preparation method of the above-mentioned high-strength nodular cast iron QT900-6 comprises the following steps:

[0040] (1) Ingredients: The raw materials and proportions are as follows: 46% high-purity pig iron, 50% low-sulfur and low-manganese steel scrap, 0.5% silicon carbide, 0.3% recarburizer, 1.0% copper, 0.2% ferrochrome, 2% ferrosilicon alloy ;

[0041] (2) Smelting: Put the high-purity pig iron in step (1) into an intermediate frequency induction furnace for smelting, add half the weight of silicon carbide after seeing the molten iron, and then add carburant, low-sulfur and low-manganese scrap steel, carburant in the process of smelting Add in two batches and press in with low-sulfur and low-manganese scrap steel, and add the remaining silico...

Embodiment 2

[0051] A high-strength ductile iron QT900-6, composed of the following elements by weight percentage: C: 3.5%, Si: 2.4%, Mn: 0.01%, P: 0.01%, S: 0.01%, Cu: 1.0%, The balance is Fe and unavoidable trace elements.

[0052] A preparation method of high-strength nodular cast iron QT900-6, comprising the following steps:

[0053] (1) Ingredients: The raw materials and proportions are as follows: 45% high-purity pig iron, 50.3% low-sulfur and low-manganese steel scrap, 1.5% silicon carbide, 0.7% recarburizer, 1.1% copper, 0.3% ferrochrome, and 1.1% ferrosilicon alloy ;

[0054] (2) Smelting: Put the above-mentioned high-purity pig iron into the medium-frequency induction furnace for smelting, add half the weight of silicon carbide after seeing the molten iron, and then add recarburizer, low-sulfur and low-manganese scrap steel, and add recarburizer in 2 batches during the smelting process. Low-sulfur and low-manganese scrap steel is pressed in; when the smelting reaches 2 / 3, the r...

Embodiment 3

[0064] A high-strength ductile iron QT900-6, composed of the following elements by weight percentage: C: 3.7%, Si: 2.6%, Mn: 0.1%, P: 0.03%, S: 0.01%, Cu: 0.9%, The balance is Fe and unavoidable trace elements.

[0065] A preparation method of high-strength nodular cast iron QT900-6, comprising the following steps:

[0066] (1) Ingredients: The raw materials and proportions are as follows: 50% high-purity pig iron, 45.2% low-sulfur and low-manganese steel scrap, 1.4% silicon carbide, 0.8% recarburizer, 1.0% copper, 0.2% ferrochrome, and 1.4% ferrosilicon alloy ;

[0067] (2) Smelting: Put the above-mentioned high-purity pig iron into the medium-frequency induction furnace for smelting, add half the weight of silicon carbide after seeing the molten iron, and then add recarburizer, low-sulfur and low-manganese scrap steel, and add recarburizer in 2 batches during the smelting process. Low-sulfur and low-manganese scrap steel is pressed in, and the remaining silicon carbide is ...

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Abstract

The invention discloses high-strength nodular cast iron QT900-6 which consists of the following elements in percentage by weight: 3.2-3.7% of C, 2.4-2.8% of Si, less than or equal to 0.2% of Mn, less than or equal to 0.03% of P, 0.005-0.02% of S, 0.8-1.4% of Cu and the balance of Fe and unavoidable trace elements. The high-strength nodular cast iron QT900-6 has high compressive strength, high yield strength and excellent mechanical property.

Description

technical field [0001] The invention relates to the technical field of cast iron metallurgy, in particular to a high-strength nodular cast iron QT900-6 and a preparation method thereof, which can be used as materials for auto parts, mining machinery and other parts. Background technique [0002] Ductile iron material has good comprehensive mechanical properties and process properties, high strength, impact resistance, and good toughness. It is incomparable to other materials in terms of plasticity, corrosion resistance, oxidation resistance, heat resistance, crack resistance, and vibration reduction. It is used in some parts with complex stress and high requirements on strength, toughness and wear resistance. [0003] With the development of science and technology, the performance requirements of automobile parts for materials are getting higher and higher. Higher performance can improve the usability and safety of automobiles. Materials with high grade, low price and excell...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/08C21C1/10
CPCC21C1/10C22C33/08C22C37/04C22C37/10
Inventor 柴西成张翼史玉锋任豹子陈伟周兆伦
Owner 西峡县内燃机进排气管有限责任公司
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