A High Elongation Ductile Iron and Its Heat Treatment Process

A technology of nodular cast iron and high elongation, which is applied in the field of casting, can solve the problems of inability to form batch production, increase development costs, and huge cost investment, so as to save cost and resource investment, facilitate production and management, and improve mechanical properties. Effect

Active Publication Date: 2017-06-06
GUIZHOU ANJI AVIATION PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because the material QT500-7 casting is a single product, the quantity of product delivery is small, and mass production cannot be formed. At the same time, there are certain differences in the ingredients of QT500-7 and QT500-2. The material of QT500-7 is a new material in the company. If Research and development requires new material process testing and verification, which will inevitably delay the delivery node of castings and will greatly increase the development cost
Furthermore, a small amount of casting development will result in excess melting equipment, resulting in material waste and cost waste in production management
Therefore, if the production line is replaced and QT500-7 is produced independently, it will generate huge cost input, and the use of QT500-7 materials cannot significantly reduce product costs

Method used

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  • A High Elongation Ductile Iron and Its Heat Treatment Process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A high-elongation ductile iron according to the present invention, its chemical composition includes 3.0% to 3.6% of C, 2.0% to 3.4% of Si, 0.6% to 1.5% of Mn, and 0.03% to 0.08% of Mg , 0.03% to 0.1% of rare earth elements RE, and ≤2.0% of Ni, ≤1.0% of Cu, ≤0.03% of S, ≤0.15% of P, and the rest is composed of iron and impurities;

[0026] Its Brinell hardness is 170-230;

[0027] Its manufacturing process includes smelting, casting, normalizing and tempering. In the smelting step, the iron raw material is smelted at high temperature to make it into a molten state. When the temperature of the molten metal reaches 1420-1440°C, ferrosilicon, ferromanganese, Copper; when the temperature of the molten metal reaches 1430-1450°C, it is taken out of the furnace, treated with rare earth ferrosilicon-magnesium alloy for spheroidization, pours a triangular sample, checks the spheroidization effect, and can be poured if the spheroidization is good; The sand casting process casts ...

Embodiment 2

[0035]A high-elongation ductile iron according to the present invention, its chemical composition includes 3.0% to 3.5% of C, 2.1% to 2.4% of Si, 0.6% to 1.5% of Mn, and 0.06% to 0.08% of Mg , 0.04%-0.1 rare earth element RE, 0.7-2.0% Ni, 0.7-1.0% Cu, 0.004-0.03% S, 0.016-0.15% P, and the rest consists of iron and impurities.

[0036] Its Brinell hardness is 170-230;

[0037] Its manufacturing process includes smelting, casting, normalizing and tempering. In the smelting step, the iron raw material is smelted at high temperature to make it into a molten state. When the temperature of the molten metal reaches 1420-1440°C, ferrosilicon, ferromanganese, Copper; when the temperature of the molten metal reaches 1440-1450°C, it is taken out of the furnace, and the rare earth ferrosilicon-magnesium alloy is used for spheroidization treatment, and the triangular sample is poured to check the spheroidization effect. If the spheroidization is good, it can be poured; The sand casting pr...

Embodiment 3

[0045] A kind of high elongation ductile iron of the present invention, its chemical composition includes 3.0% C, 2.4% Si, 1.5% Mn, 0.06% Mg, 0.04% rare earth element RE, and 2.0% Ni, 0.9% Cu, 0.004% S, 0.14% P, and the rest are composed of iron and impurities;

[0046] Its Brinell hardness is 170-230;

[0047] Its manufacturing process includes smelting, casting, normalizing and tempering. In the smelting step, the iron raw material is smelted at high temperature to make it into a molten state. When the temperature of the molten metal reaches 1420°C, ferrosilicon, ferromanganese and copper are added; When the temperature of the molten metal reaches 1430°C, it is taken out of the furnace, treated with a rare earth ferrosilicon-magnesium alloy, poured a triangular sample, and checked the effect of the spheroidization, and it can be poured if the spheroidization is good; in the casting process, the sand casting process is used for casting 10 barrels of ductile iron expansion ri...

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Abstract

The invention discloses nodular cast iron with high elongation and a heat treatment process of the nodular cast iron and belongs to the technical field of casting. The nodular cast iron comprises 3.0%-3.6% of C, 2.0%-3.4% of Si, 0.6%-1.5% of Mn, 0.03%-0.08% of Mg, 0.03%-0.1% of a rare earth element Re, not larger than 2.0% of Ni, not larger than 1.0% of Cu, not larger than 0.03% of S and not larger than 0.15% of P. According to the technical scheme, the chemical components and the process method of a casting are improved under existing conditions, and the mechanical property, on the QT500-2 level, of an original nodular cast iron is improved and reaches the QT500-7 level; and the elongation of the nodular cast iron is increased under the condition that an existing production line is not changed, the mechanical property of an aircraft material is improved, and the requirements of the product acceptance standard are fully met.

Description

technical field [0001] The invention belongs to the technical field of casting, and relates to a heat treatment method for improving the mechanical property index of a material through heat treatment, in particular to a ductile cast iron with improved elongation and a heat treatment process thereof. Background technique [0002] Among the aerospace materials used in precision casting in our factory, the most widely used grade of ductile iron is QT500-2. QT500-2 is the internal standard of our factory. The use of this standard of ductile iron can meet the mechanical properties of aviation materials. . However, with the gradual improvement of the quality requirements of aviation products, materials with the grade QT500-7 are currently used in the design of some new products. The mechanical properties of QT500-7 are better than those of QT500-2. The mechanical performance index of 7 is used as the acceptance standard, and the chemical composition of the material is not used as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/04C22C37/10C21D5/00
Inventor 赵佩霞
Owner GUIZHOU ANJI AVIATION PRECISION CASTING
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