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Casting thick large-section pearlite nodular cast iron and casting method thereof

A pearlite sphere and large cross-section technology, applied in the field of nodular cast iron, can solve the problems of unsatisfactory mechanical properties, complicated process steps, and low production efficiency of nodular cast iron, and achieve good mechanical properties, improve economic benefits, and improve production efficiency.

Active Publication Date: 2013-03-13
RIYUE HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production of thick and large cross-section pearlitic ductile iron mostly needs to be obtained through post-heat treatment, and a few adopt the method of producing thick and large cross-section pearlitic ductile iron in the as-cast state. There are many types of raw materials required, the process steps are relatively complicated, the production cost is high, and the production efficiency is high. Low, and the mechanical properties of the ductile iron produced at the same time are not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Production of as-cast thick and large section pearlitic ductile iron target castings with a casting size of 300mm×300mm×500mm; wherein the weight percentages of each component of the as-cast thick and large section pearlitic nodular cast iron target castings are: carbon 3.58%, silicon 2.43%, The total content of manganese 0.65%, phosphorus 0.03%, sulfur 0.015%, magnesium 0.04%, copper 0.4%, antimony 0.016%, rare earth 0.03% and other trace elements ≤ 0.1%, and the balance is iron.

[0013] Pig iron, recycled material, steel scrap, ferrosilicon, ferromanganese, electrolytic copper, and antimony ingot are used as raw materials, and the above raw materials are mixed according to the given target casting components, and the cupola-electric furnace is used for smelting, and then the smelting Good molten iron is spheroidized, inoculated and poured after inoculation; the mixture of yttrium-based heavy rare earth spheroidizer and light rare earth spheroidizer is selected as the ...

Embodiment 2

[0017] Production of as-cast thick and large section pearlitic ductile iron target castings with a casting size of 250mm×250mm×500mm; wherein the weight percentages of each component of the as-cast thick and large section pearlitic nodular cast iron target castings are: carbon 3.6%, silicon 2.1%, 0.8% manganese, 0.03% phosphorus, 0.02% sulfur, 0.05% magnesium, 0.8% copper, 0.02% antimony, 0.03% rare earth and other trace elements, the sum of which is ≤0.1%, and the balance is iron.

[0018] Pig iron, recycled material, steel scrap, ferrosilicon, ferromanganese, electrolytic copper, and antimony ingot are used as raw materials, and the above raw materials are mixed according to the given target casting components, and the cupola-electric furnace is used for smelting, and then the smelting The good molten iron is spheroidized, and after inoculation treatment, the iron is poured; the mixture of yttrium-based heavy rare earth nodulizer and light rare earth nodulizer is selected as ...

Embodiment 3

[0022] Production of as-cast thick and large section pearlitic ductile iron target castings with a casting size of 200mm×200mm×500mm; the weight percentages of each component of the as-cast thick and large section pearlitic nodular cast iron target castings are: carbon 3.7%, silicon 2.6%, 0.7% manganese, 0.03% phosphorus, 0.01% sulfur, 0.03% magnesium, 0.7% copper, 0.02% antimony, 0.03% rare earth and other trace elements, the sum of which is ≤0.1%, and the balance is iron.

[0023] Pig iron, recycled material, steel scrap, ferrosilicon, ferromanganese, electrolytic copper, and antimony ingot are used as raw materials, and the above raw materials are mixed according to the given target casting components, and the cupola-electric furnace is used for smelting, and then the smelting The good molten iron is spheroidized, and after inoculation treatment, the iron is poured; the mixture of yttrium-based heavy rare earth nodulizer and light rare earth nodulizer is selected as the nodu...

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Abstract

The invention discloses casting thick large-section pearlite nodular cast iron and a casting method thereof. The nodular cast iron comprises the following components in percentage by weight: 3.4%-3.7% of C, 2.1%-2.6% of Si, 0.4%-0.8% of Mn, at most 0.04% of P, at most 0.02% of S, 0.03%-0.05% of Mg, 0.4%-1.0% of Cu, 0.01%-0.02% of Sb, 0.01%-0.03% of rare earth, other microelement the total content of which is at most 0.1%, and the balance of iron. The casting method comprises the following traditional technology steps: blending, smelting, balling treatment, inoculation treatment and pouring. As for the casting thick large-section pearlite nodular cast iron, the tensile strength is more than or equal to 592MPa, the yield strength is more than or equal to 357MPa, the specific elongation is more than or equal to 4%, Brinell hardness is HB224-HB240, the pearlite content is more than or equal to 85%, and the casting thick large-section pearlite nodular cast iron has a favorable mechanic property.

Description

technical field [0001] The invention relates to a nodular cast iron, in particular to a pearlite nodular cast iron with thick and large cross-section in as-cast state and a casting method thereof. Background technique [0002] Thick and large section ductile iron refers to ductile iron with a wall thickness greater than or equal to 100mm. Pearlitic ductile iron refers to ductile iron in which pearlite accounts for more than 80% of the matrix structure. Pearlitic ductile iron is widely used in the machinery manufacturing industry due to its excellent performance. widely used in. At present, the production of thick and large cross-section pearlitic ductile iron mostly needs to be obtained through post-heat treatment, and a few adopt the method of producing thick and large cross-section pearlitic ductile iron in the as-cast state. There are many types of raw materials required, the process steps are relatively complicated, the production cost is high, and the production efficie...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C33/08
Inventor 宋贤发傅明康郑燕华
Owner RIYUE HEAVY IND
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