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Preparation method of nodular cast iron alloy

A technology of nodular cast iron and alloy, applied in the field of preparation of nodular cast iron alloy, can solve the problems of limited high temperature resistance, wear of brake disc coating, increased cost, etc., to improve high temperature resistance, expand application range, and prolong service life Effect

Inactive Publication Date: 2014-02-05
QINGDAO LIANGLI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cast iron alloys have a defect that they have limited high temperature resistance during use. Under high temperature conditions, cast iron alloys will soften. In general, the suitable temperature for cast iron alloys is lower than 350 0 C
However, in cast iron alloy parts such as brake discs, during the braking process, 800-900 0 The high temperature of C, such a result not only wears the coating of the brake disc, but also causes the deformation of the coating of the brake disc, which affects the performance of the brake disc. Therefore, the brake disc must be replaced after a period of use, which leads to cost increase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The mass percentage of the ductile iron alloy in this embodiment is: C: 3.2%, Si: 2.8%, Mn: 0.6%, P: 0.01%, S: 0.01%, Cu: 0.08%, Cr: 0.01%, Al : 0.005%, Mg: 0.03%, V: 0.03%, the balance is Fe and inevitable trace elements.

Embodiment 2

[0019] The mass percentages of the ductile iron alloy in this embodiment are: C: 3.3%, Si: 3.0%, Mn: 0.8%, P: 0.03%, S: 0.01%, Cu: 0.12%, Cr: 0.025%, Al : 0.01%, Mg: 0.04%, V: 0.04%, the balance is Fe and inevitable trace elements.

Embodiment 3

[0021] The mass percentage of ductile iron alloy in this embodiment is: C: 3.25%, Si: 2.9%, Mn: 0.7%, P: 0.02%, S: 0.01%, Cu: 0.1%, Cr: 0.02%, Al : 0.008%, Mg: 0.035%, V: 0.035%, the balance is Fe and inevitable trace elements.

[0022] The above-mentioned ductile iron alloy is prepared by the following method:

[0023] (1) Raw material smelting: Weigh the pig iron, recycled material, scrap, and vanadium ingots of ductile iron alloy raw materials according to the predetermined formula and put them into an intermediate frequency furnace for smelting. During the smelting process, ensure that the molten iron temperature is 1450 0 ~1500 0 , After smelting, detect the content of each element in the molten iron and adjust the content of each element until it meets the requirements of the formula. When the amount of molten iron in the ladle reaches the required weight, the iron will be spheroidized;

[0024] (2) Spheroidizing treatment: Pour molten iron into molten iron ladle, add spheroidi...

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PUM

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Abstract

The invention discloses a preparation method of a nodular cast iron alloy. The nodular cast iron alloy comprises the following raw materials by mass percent: 3.2% to 3.3% of C, 2.8% to 3.0% of Si, 0.6 to 0.8% of Mn, 0.01% to 0.03% of P, 0.01% of S, 0.08% to 0.12% of Cu, 0.01% to 0.025% of Cr, 0.005% to 0.01% of Al, 0.03% to 0.04% of Mg, 0.03% to 0.04% of V and the balance of Fe and inevitable trace elements, wherein all the raw materials are smelted, spheroidized and inoculated twice. Alloy elements such as V (vanadium) and the like are added into the nodular cast iron alloy, so that the high-temperature resistance of the nodular cast iron alloy is improved; the application range of the nodular cast iron alloy is enlarged. Thus, the stability of the nodular cast iron alloy at a high temperature is improved while the abrasion resistance of the nodular cast iron alloy is ensured. As a result, the service life of the nodular cast iron alloy is prolonged.

Description

Technical field [0001] The invention relates to the technical field of manufacturing ductile iron materials, in particular to a method for preparing ductile iron alloys. Background technique [0002] In the field of automobile or machinery manufacturing, cast iron alloys are used to prepare parts with high wear resistance or parts with complex structures. The use of cast iron alloys in the casting process can reduce the difficulty of processing and reduce production costs. However, a defect of cast iron alloys is that they have limited ability to withstand high temperatures during use. Under high temperature conditions, cast iron alloys will soften. In general, the suitable temperature for cast iron alloys is lower than 350 0 C. However, in cast iron alloy parts such as brake discs, during the braking process, 800-900 will be locally generated by friction. 0 The high temperature of C not only wears the coating of the brake disc, but also causes the deformation of the brake disc ...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08
Inventor 段文良
Owner QINGDAO LIANGLI PRECISION CASTING