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High-dimensional-stability cast iron and preparing method thereof

A dimensional stability, cast iron technology, applied in the field of high strength, high elastic modulus, low stress cast iron, high dimensional stability, can solve the failure to meet the performance requirements of HT300, increase the casting stress of the casting, reduce the mechanical properties of the material, etc. problem, to achieve the effect of favorable retention, reduction of casting residual stress, and good hardness uniformity

Active Publication Date: 2016-08-17
SHENYANG RES INST OF FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method, while improving the strength, also increases the casting stress of the casting (usually above 60-80MPa), resulting in increased deformation of the casting and poor dimensional stability.
[0006] Simply increasing the carbon equivalent of gray cast iron will greatly reduce the mechanical properties of the material
For example, research has found that increasing the carbon equivalent (CE) of gray cast iron to 3.83-3.90% without taking other measures reduces the tensile strength of gray cast iron to about 270MPa, which cannot meet the performance requirements of HT300

Method used

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  • High-dimensional-stability cast iron and preparing method thereof
  • High-dimensional-stability cast iron and preparing method thereof
  • High-dimensional-stability cast iron and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Casting production method of high dimensional stability cast iron castings:

[0039] The melting of molten iron adopts medium frequency induction furnace and neutral lining. The amount of steel scrap added is 70% (weight percentage, the same below), the amount of pig iron added is 5%, the amount of returned charge is 21%, other alloys and recarburizers are the balance, and the chemical composition of molten iron meets the technical requirements. Liquid iron superheat temperature: 1504 ℃. The inoculation treatment is carried out by "incubation method incubating in the bag + inoculation in the tap tank + inoculation with flow". The inoculant is FeSi75, and the addition amount is 0.6% of the weight of the molten iron after deployment. The inoculated molten iron is poured into resin sand casting Type, the castings are cooled to 180 ℃, boxed, cleaned and then heat treated.

[0040] The main chemical composition (mass fraction, %) of the casting is: C 3.21%, Si 2.09%, Mn 1....

Embodiment 2

[0044] Example 2 is basically the same as Example 1, except that the main difference is that the addition of steel scrap is 75%, the addition of pig iron is 8%, the addition of returned material is 13%, and other alloys and recarburizers are the balance. The agent is a high-calcium barium inoculant, and the amount of the inoculant added is 0.68% of the weight of the molten iron after deployment; the superheating temperature of the molten iron: 1540°C; the heat treatment time of the casting at 590±15°C is 6 hours.

[0045] The main chemical composition (mass fraction, %) of the casting is: 3.17%C, 1.89%Si, 0.95%Mn, 0.042%P, 0.036%S, 0.28%Cr, 0.69%Cu, 3.81%CE.

[0046] The test results of the casting are: tensile strength: 343 (MPa), modulus of elasticity: 135 (GMPa), hardness 218HBW, residual stress of the casting: 23.4 (MPa).

Embodiment 3

[0048] Example 3 is basically the same as Example 1, except that the main difference is that the addition of steel scrap is 65%, the addition of pig iron is 7%, the addition of recycle material is 24%, and the balance of other alloys and recarburizers, inoculation The agent is a high-calcium barium inoculant, and the amount of the inoculant added is 0.7% of the weight of the molten iron after deployment; the superheating temperature of the molten iron: 1520°C; the heat treatment time of the casting at 590±15°C is 6 hours.

[0049] The main chemical composition (mass fraction, %) of the casting is: 3.19%C, 1.96%Si, 1.10%Mn, 0.058%P, 0.031%S, 0.34%Cr, 0.56%Cu, 3.86%CE.

[0050] The product is a machine bed, and the test results of the bed casting are: tensile strength: 338 (MPa), modulus of elasticity: 131 (GMPa), residual stress of the casting: 16.2 (MPa). Table 1 shows the hardness of the rail surface of the cast iron bed with high dimensional stability produced by the technol...

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Abstract

The invention aims to provide cast iron and production technology method for casting by using the material. The cast iron is prepared from, by mass, 3.10-3.25% of C, 1.8-2.1% of Si, 0.94-1.15% of Mn, 0.03-0.07% of S, 0.25-0.34% of Cr, 0.5-0.7% of Cu, and the balance Fe, wherein the content of P is smaller than or equal to 0.07%; the carbon equivalent is 3.80-3.95% CE, and the ratio of silicon to carbon Si / C is 0.58-0.65. The high carbon equivalent is one of key points and is an important measure to reduce casting stress. The cast iron has the advantages of being high in dimensional stability, strength and elasticity modulus, low in stress, simple in production process, stable in cast iron quality and capable of meeting the requirement for manufacturing various equipment components.

Description

technical field [0001] The invention relates to the related technical field of cast iron materials, and in particular provides a cast iron with high dimensional stability, high strength, high elastic modulus and low stress and a casting production method of castings using the material. Background technique [0002] Modern equipment has higher and higher requirements on the performance of components, not only requiring them to have good mechanical properties, but also requiring them to have certain special properties. For example, important components such as the fuselage of some major equipment require good mechanical properties and thermal conductivity. , shock absorption, etc. At the same time, it is required to have high dimensional stability to maintain the dimensional accuracy and precision retention of the components, so as to achieve high precision and precision retention of the entire set of equipment. [0003] Gray cast iron has good mechanical properties, thermal c...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/06C21D1/30C21D5/00C22C33/08
CPCC21D1/30C21D5/00C21D2211/006C21D2211/009C22C33/08C22C37/06C22C37/10
Inventor 董峰齐笑冰王鹏华李海兰
Owner SHENYANG RES INST OF FOUNDRY
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