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Steady state nonlinearity based heat-resistant spheroidal graphite cast iron and processing method thereof

A technology of ductile cast iron and processing methods, which is applied in the field of ductile cast iron materials, can solve problems such as performance degradation and spheroidization of pearlite sheets, and achieve high strength, improved casting performance, and good performance

Inactive Publication Date: 2017-12-12
MAANSHAN WANXIN CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not as long as it is ductile iron, it is suitable for high temperature resistance, and its matrix structure should be ferrite, otherwise, if there is pearlite in the matrix structure, it will lead to the spheroidization of pearlite sheets, resulting in a sharp decline in its performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add steel scrap, pig iron, recycled materials and alloys into the intermediate frequency electric furnace according to the ingredients. After smelting, the chemical composition of the main elements of the molten iron (wt%) C: 3.23, Si: 2.91, Al: 9.92, Mo: 3.35, Cu: 0.2, Cr: 0.15, Zn: 0.06, Re: 0.035, and the rest is Fe. The temperature of the original molten iron is 1641°C, by adding 2.1% nodularizer, 0.36% inoculant and 0.36% copper by the weight of the original molten iron by using the method of pouring into the ladle, it will drop to 1350°C ~ 1410°C within 3-5 minutes , and add an inoculant of 0.37% of the weight of the original molten iron for inoculation with the flow, and use an inoculant of 0.05% of the weight of the molten iron for instantaneous inoculation during the pouring process of the molten iron, and the pouring time is 5-13 minutes.

Embodiment 2

[0030] Add steel scrap, pig iron, recycled materials and alloys into the intermediate frequency electric furnace according to the ingredients. After smelting, the chemical composition of the main elements of the molten iron (wt%) C: 3.1%, Si: 3.1%, Al: 10.2%, Mo: 2.5%, Cu: 0.1%, Cr: 0.13%, Zn: 0.05%, Re: 0.04%, and the rest is Fe. The temperature of the original molten iron is 1651°C, by adding 2.3% nodulizer, 0.39% inoculant and 0.39% copper by the weight of the original molten iron by pouring into the ladle, it will drop to 1350°C ~ 1410°C within 3-5 minutes , and add an inoculant of 0.38% of the weight of the original molten iron for inoculation with the flow, and use an inoculant of 0.05% of the weight of the molten iron for instantaneous inoculation during the pouring process of the molten iron, and the pouring time is 5-13 minutes.

Embodiment 3

[0032] Add steel scrap, pig iron, recycled materials and alloys into the intermediate frequency electric furnace according to the ingredients. After smelting, the chemical composition of the main elements of the molten iron (wt%) C: 3.2%, Si: 2.9%, Al: 9.9%, Mo: 3.1%, Cu: 0.12%, Cr: 0.17%, Zn: 0.07%, Re: 0.03%, and the rest is Fe. The temperature of the original molten iron is 1661°C, by adding 2.5% nodulizer, 0.40% inoculant and 0.39% copper by the weight of the original molten iron by pouring into the ladle, it will drop to 1350°C ~ 1410°C within 3-5 minutes , and add an inoculant of 0.38% of the weight of the original molten iron for inoculation with the flow, and use an inoculant of 0.05% of the weight of the molten iron for instantaneous inoculation during the pouring process of the molten iron, and the pouring time is 5-13 minutes.

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Abstract

The invention discloses steady state nonlinearity based heat-resistant spheroidal graphite cast iron and a processing method thereof, and relates to the technical field of spheroidal graphite cast iron materials. The steady state nonlinearity based heat-resistant spheroidal graphite cast iron comprises the following components including, by weight percentage, 3.1%-3.3% of C, 2.8%-3.1% of Si, 8.9%-10.2% of Al, 2.3%-3.5% of Mo, 0.1%-0.2% of Cu, 0.13%-0.2% of Cr, 0.02%-0.1% of Zn, 0.03%-0.05% of Re and the balance Fe. A greater quantity of graphite which is higher in roundness is obtained by adopting a certain chemical component composition and process parameter control, and matrix structures with a certain ferrite to pearlite proportion are obtained, so that a spheroidal graphite cast iron cast can be stably produced as cast condition, wherein the tensile strength of the body reaches 650 MPa, the yield strength Rp0.2 is greater than or equal to 380 MPa and the elongation is greater than 10%, and the steady state nonlinearity based heat-resistant spheroidal graphite cast iron disclosed by the invention has relatively high elongation while has relatively high strength.

Description

technical field [0001] The invention belongs to the technical field of spheroidal grinding cast iron materials, in particular to a steady-state nonlinear heat-resistant spheroidal grinding cast iron and a processing method thereof. Background technique [0002] Ductile iron is generally used for parts produced under heat-resistant conditions. And it is generally ferritic ductile iron. Not only ductile iron is suitable for high temperature resistance, its matrix structure should be ferrite, otherwise, if there is pearlite in the matrix structure, it will lead to the spheroidization of pearlite sheets, resulting in a sharp decline in its performance. [0003] The factors considered in the project are not simply a certain performance index. In some cases, gray iron is also used as a high-temperature resistant part, typically an automobile brake hub, and its operating temperature can reach over 700 degrees locally. The reason is that the shock absorption performance and heat d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/06C22C33/10C22C37/04
CPCC22C37/10C22C33/10C22C37/04C22C37/06
Inventor 张立安魏明军
Owner MAANSHAN WANXIN CASTING