Low-temperature-resistant nodular iron casting and preparation method thereof

A low-temperature-resistant, iron casting technology, applied in the field of ductile iron castings and its preparation, can solve the problems of low-temperature-resistant ductile iron impact energy damage, reduce the toughness and plasticity of ductile iron castings, reduce the low-temperature impact performance of ductile iron, and achieve spheroidization Sufficiently, improve the graphite spheroidization rate and reduce the effect of brittleness

Inactive Publication Date: 2016-03-23
RIYUE HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this preparation method also has the following problems: 1. Since pig iron, steel scrap and recycled material are used as raw materials in this preparation method, and these materials all contain Mn and P elements, the There are more Mn and P elements in ductile iron castings, and Mn can increase the tendency of segregation and promote the formation of carbides and pearlite in the matrix, which is very unfavorable to toughness, especially to the impact energy of low temperature resistant nodular cast iron. Serious damage; And P will reduce the toughness and plasticity of ductile iron casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The low-temperature-resistant ductile iron castings in this example use the 25mm Y-type test block in the GB / T1348-2009 standard.

[0031] The low temperature resistant ductile iron casting in the present embodiment, the percentage by weight of its each component content is:

[0032] C: 3.7%; Si: 2%; Mn: 0.014%; P: 0.014%; S: 0.011%; Mg: 0.04%;

[0033] The preparation method of the low temperature resistant ductile iron casting in the present embodiment comprises the following steps in sequence:

[0034] 1. Configure raw materials, which include the following substances in weight percentage: pure iron: 87%, pig iron: 6%, recarburizer: 4.7%, ferrosilicon: 2%, Ni: 0.3%; 2. Smelting, namely First add all pig iron, 20% pure iron and 99% recarburizer into the electric furnace for melting until the above raw materials are completely melted, then add the remaining 80% pure iron, all ferrosilicon and all Ni is sequentially added to the electric furnace for melting until the ...

Embodiment 2

[0043] The low-temperature-resistant ductile iron castings in this example use the 25mm Y-type test block in the GB / T1348-2009 standard.

[0044] The low temperature resistant ductile iron casting in the present embodiment, the percentage by weight of its each component content is:

[0045] C: 3.6%; Si: 1.9%; Mn: 0.013%; P: 0.014%; S: 0.01%; Mg: 0.055%;

[0046] The preparation method of the low temperature resistant ductile iron casting in the present embodiment comprises the following steps in sequence:

[0047] 1. Configure raw materials, which include the following substances in weight percentage: pure iron: 91%, pig iron: 5%, recarburizer: 3%, ferrosilicon: 0.8%, Ni: 0.2%; 2. Smelting, namely First add all pig iron, 20% pure iron and 99% recarburizer into the electric furnace for melting until the above raw materials are completely melted, then add the remaining 80% pure iron, all ferrosilicon and all Ni is sequentially added to the electric furnace for melting until th...

Embodiment 3

[0056] The low-temperature-resistant ductile iron castings in this example use the 25mm Y-type test block in the GB / T1348-2009 standard.

[0057] The low temperature resistant ductile iron casting in the present embodiment, the percentage by weight of its each component content is:

[0058] C: 3.64%; Si: 1.97%; Mn: 0.014%; P: 0.013%; S: 0.011%; Mg: 0.045%;

[0059] The preparation method of the low temperature resistant ductile iron casting in the present embodiment comprises the following steps in sequence:

[0060] 1. Configure raw materials, which include the following substances in weight percentage: pure iron: 89%, pig iron: 5.5%, recarburizer: 3.8%, ferrosilicon: 1.4%, Ni: 0.3%; 2. Smelting, namely First add all pig iron, 20% pure iron and 99% recarburizer into the electric furnace for melting until the above raw materials are completely melted, then add the remaining 80% pure iron, all ferrosilicon and all Ni is sequentially added to the electric furnace for melting u...

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Abstract

The invention relates to a low-temperature-resistant nodular iron casting. The low-temperature-resistant nodular iron casting comprises the following components in percentage by weight: 3.6% to 3.7% of C, 1.9% to 2.0% of Si, less than 0.015% of Mn, less than 0.015% of P, less than 0.012% of S, 0.04% to 0.055% of Mg, 0.01% to 0.02% of Re, and the balance iron. A preparation method of the low-temperature-resistant nodular iron casting comprises the following steps: 1, preparing raw materials; 2, smelting; 3, sampling, analyzing and blending; 4, adding a pretreating agent; 5, tapping iron, nodulizing and inoculating; 6, deslagging; 7, casting. The low-temperature-resistant nodular iron casting and the preparation method thereof have the advantages that the nodular iron casting contains little Mn and P and is free of thermal treatment; the average impact energy of the nodular iron casting is not less than 10J under the temperature of -40 DEG C, -50 DEG C and -60 DEG C.

Description

technical field [0001] The invention relates to a ductile iron casting and a preparation method thereof, in particular to a low temperature resistant ductile iron casting and a preparation method thereof. Background technique [0002] The market demand for low-temperature-resistant and high-toughness ductile iron castings is growing rapidly. It is mainly used in equipment in alpine regions, such as gearboxes, hubs, bases, etc. for wind power equipment, or railway and subway accessories, etc. At present, on the website of the State Intellectual Property Office, the invention patent with the authorized announcement number "CN102534090B" discloses a preparation method of -60°C low-temperature impact ductile iron. The average value of the impact energy under the environment can be greater than 10J. However, this preparation method also has the following problems: 1. Since pig iron, steel scrap and recycled material are used as raw materials in this preparation method, and these...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C33/10C21C1/10
CPCC22C37/10C21C1/105C22C33/006C22C33/10C22C37/04
Inventor 张坤刘建东宋贤发傅明康
Owner RIYUE HEAVY IND
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