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High-strength nodular cast iron QT900-6 and preparation method thereof

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

Active Publication Date: 2016-10-12
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

AI Technical Summary

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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  • High-strength nodular cast iron QT900-6 and preparation method thereof
  • High-strength nodular cast iron QT900-6 and preparation method thereof
  • High-strength nodular cast iron QT900-6 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A high-strength ductile iron QT900-6 is 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 above-mentioned high-strength ductile iron QT900-6 comprises the following steps:

[0040] (1) Ingredients: Raw materials and ingredients are as follows: high-purity pig iron 46%, low-sulfur and low-manganese scrap 50%, silicon carbide 0.5%, carburizer 0.3%, copper 1.0%, ferrochromium 0.2%, ferrosilicon alloy 2% ;

[0041] (2) Smelting: add the high-purity pig iron in step (1) to the intermediate 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 recarburizer during the smelting process Add in 2 batches and press in with low-sulfur and low-manganese scrap. When the smelting reaches 2 / 3, add the rema...

Embodiment 2

[0051] A high-strength ductile iron QT900-6 is 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 ductile iron QT900-6, comprising the following steps:

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

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

Embodiment 3

[0064] A high-strength ductile iron QT900-6 is 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 ductile iron QT900-6, comprising the following steps:

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

[0067] (2) Smelting: add the above-mentioned high-purity pig iron to the intermediate frequency induction furnace for smelting, add half of the weight of silicon carbide after seeing the molten iron, then add recarburizer, low-sulfur and low-manganese scrap steel, and add the recarburizer in two 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 ductile iron QT900-6 and a preparation method thereof, which can be used as materials for parts of automobiles, mining machinery and the like. Background technique [0002] Ductile iron material has good comprehensive mechanical properties and process performance, high strength, impact resistance, good toughness, in plasticity, corrosion resistance, oxidation resistance, heat resistance, crack resistance, vibration reduction, etc., is incomparable with other materials, can be It is used in some parts with complex force and high requirements on strength, toughness and wear resistance. [0003] With the development of science and technology, the performance requirements of automotive parts for materials are getting higher and higher, and higher performance can improve the usability and safety of automobiles. breakthrough direction. The tensile strengt...

Claims

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Application Information

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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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