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A kind of molybdenum-chromium element high-alumina and high-temperature resistant ductile iron and preparation method thereof

A nodular cast iron, high temperature resistant technology, applied in the field of alloy materials, can solve the problems of low mechanical properties, poor thermal shock resistance, etc., achieve good thermal shock performance, good casting molding performance, and improve stability

Active Publication Date: 2020-01-24
纳似韦科技(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aluminum-based heat-resistant cast iron in the prior art, such as high-alumina cast iron (RQTAl22), increases the oxidation resistance under high temperature conditions due to the increase of the aluminum content to more than 20%, and can withstand working temperatures above 900 ° C. The mechanical properties at room temperature and high temperature are low, and the thermal shock resistance is poor, which is still difficult to meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A high-aluminum high-temperature-resistant ductile iron with molybdenum-chromium elements, the weight percentage of each component is: C 1.0%, Si 3.0%, Al19.5%, Mo 1.0%, Cr 0.5%, Cu 1.5%, impurity element Mg≦0.06 %, impurity element S≦0.06%, impurity element P≦0.15%, impurity element Mn≦0.7%, and the rest is Fe. Its concrete preparation method is as follows:

[0019] a. Ingredients and melting, configure the alloy according to the above target ingredients, add 150 kg of cast iron and 90 kg of scrap steel into an intermediate frequency induction furnace with a standard capacity of 500 kg, and after the metal is melted, add industrial ferrosilicon, industrial ferromolybdenum, chromium The iron and copper wires reach the above design composition, and add industrial pure aluminum ingots through the bell jar pressing method. During the smelting process of ingredients, considering that about 5% of C will be burned, Si will be increased in the subsequent inoculation process, a...

Embodiment 2

[0024] A high-aluminum high-temperature-resistant ductile iron with molybdenum-chromium elements, the weight percentage of each component is: C 3.0%, Si 0.15%, Al 26%, Mo 0.3%, Cr 2.5%, Cu 0.3%, impurity element Mg≦0.06% , impurity element S≦0.06%, impurity element P≦0.15%, impurity element Mn≦0.7%, and the rest is Fe. Its concrete preparation method is as follows:

[0025] a. Batching and melting, configure the alloy according to the above target ingredients, add 150 kg of cast iron and 60 kg of scrap steel into an intermediate frequency induction furnace with a standard capacity of 500 kg, and after the metal is melted, add industrial ferrosilicon, industrial ferromolybdenum, and chromium The iron and copper wires reach the above design composition, and add industrial pure aluminum ingots through the bell jar pressing method. During the smelting process of ingredients, considering that about 5% of C will be burned, Si will be increased in the subsequent inoculation process, ...

Embodiment 3

[0030] A high-aluminum high-temperature-resistant ductile iron with molybdenum-chromium elements, the weight percentage of each component is: C 2.0%, Si 1.6%, Al22%, Mo 3.0%, Cr 1.5%, Cu 1.0%, impurity element Mg≦0.06%, Impurity element S≦0.06%, impurity element P≦0.15%, impurity element Mn≦0.7%, and the rest is Fe. Its concrete preparation method is as follows:

[0031] a. Batching and melting, configure the alloy according to the above target ingredients, add 150 kg of cast iron and 60 kg of scrap steel into an intermediate frequency induction furnace with a standard capacity of 500 kg, and after the metal is melted, add industrial ferrosilicon, industrial ferromolybdenum, and chromium The iron and copper wires reach the above design composition, and add industrial pure aluminum ingots through the bell jar pressing method. During the smelting process of ingredients, considering that about 5% of C will be burned, Si will be increased in the subsequent inoculation process, and...

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Abstract

The invention discloses high-aluminum high-temperature-resistant nodular cast iron containing Mo and Cr elements. According to the technical scheme, the nodular cast iron is characterized by comprising the components including, by weight, 1.0%-3.0% of C, 0.15%-3.0% of Si, 19.5%-26.0% of Al, 0.3%-3.0% of Mo, 0.5%-2.5% of Cr, 0.3%-1.5% of Cu, not more than 0.06% of an impurity element Mg, not more than 0.06% of an impurity element S, not more than 0.15% of an impurity element P, not more than 0.7% of an impurity element Mn, and the balance Fe. The nodular cast iron provided by the invention canresist the operating temperature of 950 DEG C, has the good thermal shock property, the good high-temperature oxidation resistance property, the good comprehensive mechanical property, and the good casting formation property, and is relatively low in cost.

Description

technical field [0001] The invention relates to an alloy material, more specifically, it relates to a high-aluminum high-temperature-resistant nodular cast iron with molybdenum-chromium elements and a preparation method thereof. Background technique [0002] The specific power of modern internal combustion engines continues to increase, and the thermal conductivity of components such as cylinder heads, bodies, pistons, valves, exhaust manifolds, and volutes has also increased significantly. The increase in thermomechanical load not only leads to a constant increase in the cost of the exhaust system, but also requires the use of some new materials. Conventional stainless steel alloy materials, such as high temperature resistant ferritic stainless steel, contain more than 15% alloy element Cr, so the manufacturing cost is relatively high. Compared with stainless steel alloy materials, the manufacturing cost of cast iron is lower, and the casting process has better forming per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/04C22C37/06C22C37/10C22C33/12C21C1/10
CPCC21C1/10C22C33/12C22C37/04C22C37/06C22C37/10Y02P10/20
Inventor 王业双
Owner 纳似韦科技(苏州)有限公司
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