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Ultra-fine austempering nodular iron material and preparation method thereof

A technology for austempering and ductile iron, which is used in the preparation of warm quenched ductile iron materials and the field of warm quenched ductile iron materials, can solve the problems of inapplicability, large diameter of graphite balls, and low distribution density of graphite balls.

Active Publication Date: 2016-11-16
SHAN XI TONGXIN LIANZHU PIPE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an ultra-fine austempering ductile iron material, which solves the problem that the diameter of graphite balls in traditional ADI materials is large and the distribution density of graphite balls is small, and it cannot be used in rolling bearings and harmonic reducers.

Method used

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  • Ultra-fine austempering nodular iron material and preparation method thereof
  • Ultra-fine austempering nodular iron material and preparation method thereof
  • Ultra-fine austempering nodular iron material and preparation method thereof

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preparation example Construction

[0044] The present invention also provides a preparation method for the above-mentioned cast iron material, which is described in the patent "Continuous Casting and Forming Equipment for Low Plastic Metal Hollow Profiles" (Patent No.: ZL200710018928.2, Publication No.: 101134231, Publication Date: 2008-03-05) Implementation above, the difference with the original device is that the structure of the crystallizer in the original device is different from that of the crystallizer in the present invention, and the crystallizer in the present invention is a water-cooled crystallizer with double helix two inlets and two outlets, such as Figure 1~2 As shown, its structure is as follows: it includes an inner cylinder 1 and an outer cylinder 2 that are nested with each other. The bottom of the outer cylinder is connected with the lower flange 4, the upper part of the outer cylinder 2 is respectively provided with water inlet I5 and water inlet II6, the lower part of the outer cylinder 2...

Embodiment 1

[0069] Weigh the following components according to mass percentage: C: 3.7%, Si: 1.7%, Mn: 0.4%, Cr: 0.3%, S≤0.05%, P≤0.05%, Fe and other impurities are the balance, the above The sum of the mass percentages of the components is 100%, and the above materials are melted into molten iron, the final silicon content is 2.7%, and the residual magnesium content is 0.04%;

[0070] Using the vertical continuous casting method, the molten iron is drawn into a profile billet by using a double-helix two-inlet and two-outlet water-cooled crystallizer;

[0071] Conduct metallographic inspection on the original blank of the profile, including: Ⅰ. The spheroidization rate of graphite nodules not greater than 20mm from the surface is ≥ 90%; Density ≥ 550 pieces / mm 2 ;The density of graphite balls in the range of 5-10mm from the surface is ≥450 / mm 2 , the density of graphite balls within 10-15mm from the surface is ≥350 / mm 2 , the density of graphite balls in the range of 15-25mm from the s...

Embodiment 2

[0076] Weigh the following components according to mass percentage: C: 3.6%, Si: 1.5%, Mn: 0.3%, Cr: 0.5%, S≤0.05%, P≤0.05%, Fe and other impurities are the balance, the above The sum of the mass percentages of the components is 100%, and the above materials are melted into molten iron, the final silicon content is 2.8%, and the residual magnesium content is 0.045%;

[0077] Using the vertical continuous casting method, the molten iron is drawn into a profile billet by using a double-helix two-inlet and two-outlet water-cooled crystallizer;

[0078] Conduct metallographic inspection on the original blank of the profile, including: Ⅰ. The spheroidization rate of graphite nodules not greater than 20mm from the surface is ≥ 90%; Density ≥ 550 pieces / mm 2 ;The density of graphite balls in the range of 5-10mm from the surface is ≥450 / mm 2 , the density of graphite balls within 10-15mm from the surface is ≥350 / mm 2 , the density of graphite balls in the range of 15-25mm from the ...

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Abstract

The invention discloses an ultra-fine austempering nodular iron material and a preparation method thereof. The preparation method comprises the steps that after molten iron is drawn through a vertical continuous casting method to form a profile blank, metallography detection is conducted, then cyclic nodulizing annealing treatment is conducted, austempering treatment is conducted after rough machining or semifinishing machining is conducted, and the ultra-fine austempering nodular iron material is obtained finally through metallography detection. The requirements of the metallography detection are that within the layer depth 25 mm inwards from the surface of a profile, the nodularity of graphite is more than 90%, and the diameter of graphite nodules is not larger than 0.03 mm and is not larger than 0.02 mm within the layer depth of 10 mm; and the density of the graphite nodules is larger than or equal to 400 per mm<2> within the layer depth of 15 mm, and is 200-400 per mm<2> within the layer depth of 15-25 mm. The fineness degree of a substrate structure of the ultra-fine austempering nodular iron material exceeds the existing ADI industrial standard, and the ultra-fine austempering nodular iron material is suitable for being used for manufacturing rolling bearings with the self-lubrication function, and rigid wheels, flexible wheels and flexible bearings in harmonic reducers.

Description

technical field [0001] The invention belongs to the technical field of metal materials and their preparation, and in particular relates to an ultra-fine austenite bainite ductile cast iron material (ADI material, austenite bainite ductile cast iron), and also relates to a preparation method of the austenite bainite ductile cast iron material. Background technique [0002] Austenite cast iron is subjected to austempering to obtain a new material called "austenitebainite ductile cast iron", which was invented almost simultaneously by the foundry industries of China, the United States and Finland in the early 1970s scientific and technological achievements. After years of in-depth research, it has now been confirmed that the so-called ADI, which was originally called "Austenite", should actually be called "Austenitic structure" accurately, and its matrix is ​​composed of fine ferrite and retained austenite. , and inlaid with a large number of graphite balls of ductile iron aus...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/06C22C37/04C22C33/08C21C1/10C21D1/32C21D1/20
CPCC21C1/10C21D1/20C21D1/32C21D2261/00C22C33/08C22C37/04C22C37/06C22C37/10Y02P10/20
Inventor 许旸
Owner SHAN XI TONGXIN LIANZHU PIPE IND
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